1 10 90 https://theses.otagogeology.org.nz/files/original/2d7b27fadb190bc781f62b800a597b32.pdf 7ffcea9458df1b66ef9bd80ea1411068 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((168.417304580585125 -45.153316362439639,168.272038230924636 -44.792974796932569,168.658304091917216 -44.709261509929178,168.828564358117575 -45.052879697941094,168.417304580585125 -45.153316362439639)) Author last name Last name of the Author Paterson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Henley, R.W. Norris, R.J. Coombs, D.S. Abstract The Abstract for this thesis The Glenorchy lode field, comprising scheelite (CaWo4) bearing quartz lodes, is one of many gold tungsten and antimony mineralized lode fields within the Haast Schist of the South Island of New Zealand. The lode fields in the Otago schists are more abundant and were more productive than those elsewhere in the Haast Schist. The Otago schist belt is composed mainly of metasediments (psanunitic and pelitic schists) with subordinate amounts of metavolcanic rock and metachert; metamorphic grade ranges from pumpellyite-actinolite facies to the biotite zone of the greenschist facies, while amphibolite facies rocks occur in the Alpine schists adjacent to the Alpine Fault to the northwest. The origin of the epigenetic Au and W mineralization has been debated since the early 1900's when the model invoking passage through the schist of metalliferous emanations from an underlying magma was in vogue. However, the absence in the schists of suitable igneous rocks, that could be interpreted as being spatially and temporally associated with the mineralization, prompted other ore genesis models. Secretion of the Au and W from the country rocks by meteoric waters was proposed, but since the 1960's, :geological opinion has favoured an origin connected with regional metamorphism. Both geochemical and petrological approaches are utilized in this thesis in an attempt to elucidate the controls on W mineralization at Glenorchy. In the Glenorchy field, the lodes consist of quartz-calcitescheelite veins in crushed, folded, sulphide-bearing schist bounded by clay selvages. Scheelite is sporadically distributed in the quartz veins. Ore shoots are parallel to the dip and strike of the Glenorchy Lode, the most productive lode in the field. The lodes dip 15-30° NE, cutting the SW-dipping schistosity at an angle of 60-70°, and with the subsidiary lodes comprise a subhorizontal flattened network. It is tentatively concluded that the lodes originated by passage of ore-forming fluids along pre-existing normal faults developed during the early stages of uplift of the schist pile. Both syn- and post-mineralization deformation is recognized within the lode. The petrography and mineralogy of the unaltered Mt Judah schists are described, and this section forms the basis for later characterization of the hydrothermal alteration. Psarnmitic and thin-bedded (alternating pelitic-psarnmitic) schists are dominant on Mt Judah, and are within pumpellyite-actinolite facies. East of Bonnie Jean Creek the schists are in greenschist facies, and the abundance of pelitic schists and greenschists increases eastwards. From the composition of paragonitic muscovite, and existing experimental data on the upper stability limit of pumpellyite, the temperature of metamorphism in the Mt Judah schists 0 was about 400 c, although oxygen isotope data suggest the temperature could have been as high as 445°C, The petrography and mineralogy of the altered schists are described, and the changes in minimal abundance and mineral composition with hydrothermal alteration are discussed. The Mineralogical alteration zone is generally 1.5-2 m \dde and is characterized by alteration of ea-silicates (amphiboles, pumpellyite, epidote) to aggregates of chlorite and calcite, serpitization of albite, and deposition of sulphides, kaolinite, and calcite. Metamorphic sulphides, stilpnonelane, sphene and rutile were als0 altered DY the hydrothermal fluids. The mineral compositions of schist minerals were not affected, except. for chlorite which displays an increased compositional range in the altered schists, with a tendency for increased MgO and decreased FeO contents. Two alteration zones arc recognized - sericite-carbonate zone and a marginal zone. Major element and trace element analyses of the bulk schists in four traverses perpendicular to the lode show that the altered schists are depleted in CiiO, Fe 2 o3 , sio2 , Sr, and Y, and enriched in co2 , K2o, H2o, FeO, S, Rb, Cs, W, As 1 and Sb relative to the unaltered schists. Mass balance calculations suggest the ea and Sr in the scheelite, the Fe in the sulphides, and half the Si in the quartz within the lodes originated from the altered schists adjacent to the lode. S, C, As, W, Sb, Rb, Cs, and some Si were introduced to the lodes in the Mt Judah area by the ore-forming fluid from a source deeper in the schist pile. Oxygen isotope analyses of schist and lode minerals are presented. Adjacent to the lode there is an aureole up to 10 m wide in which the values of the quartz, albite, and muscovite are high relative to those in the unaltered schists. Oxygen isotope fractionations indicate a temperature range o.f 3500 -2800 C for h 018 . hn t mineralization, o18 enrichment aureole suggests the ore-forming fluid was previously in equilibrium with schists at deeper levels in the pile at temperatures exceeding 420°C~ The isotope composition of the fluid (oo18 == 8.sro0) is compatible with both metamorphic and magmatic derivation. The isotope aureole and the decrease in oxidation state of the altered schists (indicated by increased 2+ . Fe /total Fel have resulted from interaction between the schists and relatively large volumes of fluid transported up\va:t'ds in major conduits in the schist pile. Because of the lack of spatial relationship between mineralization and contemporaneous igneous activity,it is concluded that the mineralization was a consequence of various processes associated with burial metamorphism. The feasibility of such an marigin is examined. Dehydration and decarbonation reactions during metamorphism in schisto of higher grade than greenschist facies are capable of producing sufficient fluid consisting mainly of H2o, with considerable co2 component. It is suggested that the fluid was trapped in the schist pile during burial, and that an increase in permeability consequent upon microhydraulic fracturing induced by rapid uplift, allowed migration of the fluids to existing planes of weakness (faults) which were then opened up as main channel ways by further hydralic fracturing. Metal- enriched horizons as sources of Au, W, and Sb are considered not essential to ore genesis, as pervasive leaching of the metals from all lithologies in the schist belt during mineral transformation reactions associated with progressive metamorphism is all that is required for development of potential ore-forming fluids. The antipathetic distribution of Au and W mineralization is a consequence of depositional rather than source parameters. Rich scheelite deposits were formed in fractiones cutting ea-mineral enriched rocks such as psammitic schists of pumpellyiteactinolite to lower greenschist facies, as a result of reaction between the fluid and wall rocks. Hydrogen metasomatism associated with sericitization of feldspar may have resulted in gold deposition, together with minor scheelite deposition,' at lower crustal levels and higher temperatures. Consequently, the ore-forming fluid depositing scheelite at higher crustal levels would be relatively depleted in Au. The lode fields appear to be preferentially developed near hinge - zones of macroscopic nappes, but the orientation of the lode structures is related to the NE,-SW.-directed extensional tectonic regime existing after the major phases of deformation and metamorphism. The ore genesis model developed here is compared with the models for Au and w mineralization in other metamorphic belts throughout the world. It is concluded that in most of the other belts, the ore-forming vii metals and fluids originated within the metasediment-metavolcanic piles, but that igneous intrusion rather than regional metamorphism was the driving force for the mineralization process. The ore genesis model may be useful in a general sense in future mineral exploration in the Haast Schist, but the patterns of chemical and mineralogical variation around the lodes are probably too restricted to have any immediate application. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5233">http://hdl.handle.net/10523/5233</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Glenorchy Thesis description Number of pages, maps, CDs, etc. xx. 266p. Ill. Plates. Maps in text. 30cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1977Paterson Creator An entity primarily responsible for making the resource Paterson, Colin J. Date A point or period of time associated with an event in the lifecycle of the resource 1977 Title A name given to the resource A geochemical investigation of the origin of scheelite mineralisation, Glenorchy, New Zealand. Subject The topic of the resource Mineralogy Geochemistry Metamorphic geology gold mineralisation Otago Schist oxygen isotopes quartz veins scheelite mineralisation https://theses.otagogeology.org.nz/files/original/2acee1e2ef8973558efdd22c9ee61e0e.pdf 23930409359375b5f6d3706d82deaa27 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((170.227976466000086 -44.614158441999962,170.235481647000029 -44.616908047999971,170.300628977000088 -44.640733886999953,170.302055533000043 -44.641257718999952,170.329489930000022 -44.663181296999937,170.357380513000066 -44.685450170999957,170.365829093000116 -44.697842068999933,170.367115240000089 -44.701216147999958,170.3717349530001 -44.713340813999935,170.371560619000093 -44.7196216899999,170.37152122800012 -44.721079451999969,170.371193667000057 -44.733020377999935,170.371190275000117 -44.733096835999959,170.370833066000046 -44.746059014999958,170.370274747000053 -44.766323322999938,170.231722366000099 -44.763630177999971,170.231249769000101 -44.763330808999967,170.182843634000051 -44.731379043999937,170.182399727000075 -44.731084654999961,170.146386634000123 -44.707996932999947,170.012058319000062 -44.597831035999945,170.011967538000022 -44.597756652999976,170.002768160000073 -44.589873528999931,170.001705176000087 -44.588963499999977,170.003805001000046 -44.561959933999958,170.026097023000034 -44.56254271399996,170.087135314000079 -44.564109433999931,170.134899980000114 -44.565312124999934,170.18367937700009 -44.56651943199995,170.217959510000014 -44.567354888999944,170.230148658000076 -44.567650770999933,170.230080440000052 -44.569112434999965,170.230076661000112 -44.569193387999974,170.229802283000026 -44.575071521999973,170.229500341000062 -44.581538810999973,170.228890802000024 -44.594590296999968,170.228395141000078 -44.605199652999943,170.228320536000069 -44.606796225999972,170.22827829400012 -44.607700199999954,170.228203263000069 -44.609305766999967,170.228201582000111 -44.609341745999984,170.228120662000038 -44.61107323799996,170.228054451000048 -44.61248991399998,170.227977937000105 -44.614126959999965,170.227976466000086 -44.614158441999962)) Author last name Last name of the Author Ryburn Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Campbell, J.D. Abstract The Abstract for this thesis INTORDUCTION The Triassic f o ssi l loc a lity a t Corbie s Creek, North Otago was discovered i n 1958 by E . 8 . Gair and D. R. Gregg of the New Zeal an.d U·eological Survey. , 'l'his wa s recollect ed later in 1958 and a paper by Gair, Gregg and Speeden desm:i bing t he occurrence was published in 1962. The primary aim of this investi gation was to map the fossil locality tog ether with any extension of' the f ossili ferous horizon that might exist. Prom t his it was hoped that stratigraphy, structure and relationship with surrounding lithologies mi ght be elucidated. Field Work, Dat es and Procedure. F ield work was started on the 3rd of December 1963, twelve da~,rs ·being s pent on a geological traverse t hrough the ori ginal :fos sil locality and on reconnaisance of t he surrm_m ding rocks. Nurner ous :fossil localities were d:LscovePed over• an area of sevePal square miles. A brief / I - 2 - visit with Prof essor · Coombs on the 20th and 21st of December was followed by ·16 days in the area starting :from the 1st of J·anuary, '196L+. This period was s pent in est ablishing , measuring and extending ma ppable units within t he fossiliferous sediments, particularly in the area several miles south-ea st of the Corbies . Creek locality. Fossil collections were made over much of this area. Mr J.D. Campbell accompanied the writer on a three day v:Lsit towards the end of F ebruary. Starting on February the 29th, three days were spent in the area immediately to the south and south-east of the ori ginal Corbies Creek locality and a fourth on the north-west side of the Otrunatapio River. Possils found there served to esta.blish the nol~th-west con tinuation of the Triassic sediments. Work was continued in the Ntay vacation from the 20th to the 31st, mainly on extending the mapping as far as the Otematata River. Several days were used in attempting to correlate the area containing the Corbies Creek locality with the separate fossiliferous area to the south-east . Assistance was given to Professor J .· B~ .'_Mackie and party in establishing grolmd control points on the first weekend of Au gust. In the field, mapping was drawn directly on to the air-photos. Sections were measured with a tape compass and clinometer. - 3 - .Aclmowledgements:- 'rhe project was supervised by Mr J .• D. Camp bell to whom I am indebt ed f' o:e assistance and direction, particularly in :fossil identifications. I a~ grateful to Prof'essor Coombs :for suggestions and guida.YJ.ce in :fieldwork, and to Professor Maclde, O.A. Evans and C. ', . Garlick of the Surveying Department :for the f' irst class base map prepared f'rom air-photos. In :formation on surr01mding geology was obtained from Ivlr A.R. L1utch of the Geological Survey and :from :fellow student Y. K. Shu. I am indebted to Messrs W. P . and J.B. C~neron of Otematata Station and particularly to Mr and Mrs 'l'aylor of the Backyal"ds Homestead, Otematata Station :for their generous hospitality. Ge ographic Setting:- 'rhe position and exten t of' the ar•ea mapped is shown on the map of' the Otematata Region. A prominent fault angle depression trending northwest, south-east between the Otamatapio River and Otematata River provides the natuEal axis to the area studied ( see F i gure 1). Boundaries are provided by the two rivers mentioned above and by the crestal ridge of Middle Range to - LJ. - the north-east. 1\ line rou ghly pal'allel to Mi ddle Range 3 miles to t he soutb-west def'ines the r•emaining boundary. Tot a l area is appr•oxi::nt'l. tely 20 square miles. •rop ograJ2h.Y and Drainage:- •'rom the base of' the scarp f'orming the south-west f'ace of' Iii i ddle Range an extensive diss ected surf'ace slopes u p to the crest o:f HawkduJl Hange some 9 miles south-west. This is drained by both the Otematata and Otamatapio Rivers. The south-east third of' the area is drained by a series of' deeply incised gullies of' which Long Gully is promi n ent. These converge on the Otematata River just above the point where it cuts through Middle Range in a r et1!DI'kable meandering g oPge. 'l'he north-west t vvo-thirds is drained ma inly by Corbies Creek and tributaries. 'l'his stream is lmovm locally as tl i dclle Stream whj.le the name Glen Bouie Creek appears to apply to its upper rea ches. A larg e expanse of all1.1.v:Lal f'lood-plain and ter races between t he Otamat apio and Corbies Creel<:. will be referred t o as CoPbies Cr eek Basin. Back;yards Basin is the name given to the much smaller area of alluvium and outwash f'ans between the Backyards IIomest ead and the base of' / I - 5 - Middle Range near' the centre of the area. The low hillocky ground between the two, roughly square in plan, is called Rabbiter' s IIut Block. South-east of Backyards Basin the name Long Gully Blocl;: is intended to refer to the strip rmder'lain by fossiliferous Triassic rocl<:: s that extend as far as the Ote~ nata ta River . Culture; Vegetation and Outcrop. Acces s to the l:3ackyards Homest ead is via a pr ivate road from a gate on the Ote:natata - Omarama road about a mile beyond .Ahuriri Pass. Alternatively a rough venicle tr a ck leads directly across Middle Range f'rom tDtematata Station Homestead near Otematata t ownship. Another vehicle trEtck winds down Long G ull ~r to the Otematata River which it follows for ten miles upstream . within Ot ematata Station. 'l'he area lies wholly Ground cove1, in the lower parts tend s to be rather sparse, consisting ma inly of sorrel and scabweed with some scat t ered tussock. Some areas, particul arl y in Rabbitel,, s Hut Block, are almost devoid of vegetat ion, this being undoubtedly due to the infestation of rabbits. Hi gher ground is clothed in tussock while gulleys and sunny steep slopes are often choked with matEtgouri and sweet briar. Isolated and clumped willows are present in some wat er cmJ.r ses. / - 6 - Rainfall is reported to be 1211 a year. Outcrop is gen erally alnmdant particularly in Rahbi t er ' s Hut Block; but tends to be r'a t her low and broken there. In Long Gully Block outcrop is often rarer.1..'b1..lt better exposed due to grea t er relief'. / Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otematata River Otamatapaio River Otago north Thesis description Number of pages, maps, CDs, etc. 70 leaves. Ill, photos, diagms, Map (folded in pocket); 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1964Ryburn Creator An entity primarily responsible for making the resource Ryburn, RJ Date A point or period of time associated with an event in the lifecycle of the resource 1964 Title A name given to the resource A strip of Kaihikuan Sediments between the Otematata and Otamatapio Rivers, North Otago. Subject The topic of the resource Map Metamorphic geology Paleontology Sedimentary geology Structural geology Corbies Creek Group Kaihikuan Stage https://theses.otagogeology.org.nz/files/original/d5ede32fbd2fa3d736cbd25f9f5b3ba6.pdf 0f5e608165159ae38f8135c33bde6ce4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((171.880595031720304 -42.127729991917725,171.893774311229606 -42.126428070975187,171.908555876473656 -42.126855592022544,171.906323098572074 -42.139416143324375,171.901092679509446 -42.141939711828954,171.880552946389031 -42.141026256121279,171.878953096002903 -42.139151961045954,171.879133589909372 -42.134364064327038,171.880595031720304 -42.127729991917725)) Author last name Last name of the Author Stick Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student MacKenzie, D. Scott, J.M. Abstract The Abstract for this thesis The Reefton Goldfield produced over 67 tonnes of hard rock gold from 84 mines between 1870 and 1951, making it one of New Zealand’s richest goldfields. Reaching a depth of 692 m, the Energetic gold mine, in the Crushington group of mines was the third largest producer. Hosted in Greenland Group metasediments, the mine produced 208,992 ounces of gold during operation between 1870 and 1927 when it closed due to an underground collapse This report details the first comprehensive study of the Energetic mine and the surrounding Greenland Group host rocks. The Energetic shear zone hosts the Energetic mine on the eastern limb of the NE-striking Globe Hill Anticline. The shear zone comprises two variably mineralised faults that host three main quartz reefs. One NE-striking fault is controlled by both local bedding and cleavage whereas the other (NNW-striking) is controlled primarily by cleavage. The formation of these faults was the result of an ENE-WSW shortening direction, oblique to the local bedding but perpendicular to the NNW-striking, cleavage controlled fault. Alteration surrounding the Energetic shear zone is asymmetric to the west, most noticeably through As and S concentrations obtained through geochemical analysis of the RDD0048 drillcore. This alteration appears to be lithologically controlled to argillite. The argillaceous units were preferentially sheared and their relative impermeability compared to greywacke units prevented fluids from migrating into and altering the surrounding host rock to the east. Early hydrothermal fluids migrated into the wall rocks and altered carbonate spots in argillaceous units from ankerite to siderite proximal to mineralised zones. This compositional change is the most reliable exploration vector at the Energetic mine. Associated with this phase was the formation of wall rock sulphides that due to continual shearing were deformed and had antitaxial strain shadows form around them. The main stage of gold mineralisation along the Energetic shear zone is associated with dark grey quartz and stylolitic veins that contain pyrite. These veins are hosted in and cut early ductiley deformed quartz lodes. These veins and later crosscutting veins are more brittle in nature and indicate mineralisation along the shear zone may have been prolonged. Brittle structures have overprinted earlier ductile structures and are now the most prominent feature of mineralised rocks. The mineralised rocks are highly deformed and a succession of mineralised veins cut the rocks. Pressure solution effects are commonly associated with both ductile and brittle structures and show the prolonged nature of deformation along the shear zone. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Reefton Thesis description Number of pages, maps, CDs, etc. 155p Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2015Stick Creator An entity primarily responsible for making the resource Stick, George Nicholas, 1992 (George) Date A point or period of time associated with an event in the lifecycle of the resource 2015 Title A name given to the resource A structural, paragenetic and geochemical study of the Energetic gold mine, Reefton Goldfield, New Zealand Subject The topic of the resource Geochemistry Metamorphic geology Metamorphic petrology Mineralogy Ore deposits Alteration Buller Terrane deformation Energetic Mine Energy Dispersive Spectroscopy (EDS) gold Greenland Group Greenschist Facies metamorphism mineralisation Orogenic gold quartz veins Reefton goldfield Reefton Group shear zones https://theses.otagogeology.org.nz/files/original/92d658f74f52c6d09212f2cc6a85bc2f.pdf 9110bc1069bc6a42f4d6be2be51ad6f7 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format MULTIPOLYGON (((167.930901335000044 -44.949447728999985,167.914908122000043 -44.97447928899993,167.824397599000122 -44.944637590999946,167.720284100000072 -44.910129586999972,167.677964628000041 -44.908404096999959,167.664086596000061 -44.873539269999981,167.613601858000038 -44.858612987999948,167.524380299000086 -44.899249160999943,167.470775195000101 -44.848497786999985,167.491910261000044 -44.816456413999958,167.496981140000116 -44.808762833999936,167.444712630000026 -44.770388091999962,167.559620374000019 -44.706212297999969,167.622164954000027 -44.740247393999937,167.644512489000022 -44.752390256999945,167.646969826000031 -44.753724905999945,167.693670119000103 -44.739049300999966,167.807849135000083 -44.760587251999937,167.881162768000081 -44.787820116999967,167.912791421000065 -44.799545689999945,167.930819688000042 -44.806222229999946,167.952413952000029 -44.814213578999954,167.952886185000011 -44.814392049999981,167.950035609000111 -44.847094819999938,167.942710910000073 -44.930948496999974,167.930901335000044 -44.949447728999985)),((167.335871820000079 -44.907285779999938,167.333164740000029 -44.900886231999948,167.320994816000052 -44.872097093999969,167.309049482000091 -44.843810063999967,167.323336767000114 -44.836020345999941,167.338747730000023 -44.827613548999977,167.345963665000113 -44.823675621999939,167.358422002000111 -44.816874404999965,167.359945372000084 -44.81859237499998,167.365121659000124 -44.824428977999958,167.403689073000123 -44.867871711999953,167.40803406100008 -44.872761029999936,167.486861499000042 -44.961290242999951,167.497946102000014 -44.973712865999971,167.378165979000073 -45.007078056999944,167.373543281000025 -44.996188400999984,167.355729830000087 -44.954185137999957,167.348570091000056 -44.937284867999949,167.335871820000079 -44.907285779999938)),((167.322493475000101 -45.040413745999956,167.316915889000029 -45.053301939999983,167.312086226000019 -45.064456906999965,167.168230160000121 -45.028365737999934,167.098515818000124 -45.010793518999947,167.094864348000101 -45.009871651999958,167.099406435000105 -45.002394552999931,167.101561276000098 -44.99884653099997,167.110889471000064 -44.983481779999977,167.114547643000037 -44.977453792999938,167.123193393000065 -44.979568374999985,167.146741418000033 -44.985323627999946,167.200121828000078 -44.998347679999938,167.319458998000073 -45.027352066999981,167.323421222000093 -45.028312422999932,167.327319535000015 -45.029257121999933,167.322493475000101 -45.040413745999956)),((167.132103606000101 -45.138609023999948,167.093357136000122 -45.098679398999934,167.046896986000093 -45.050709520999931,167.046712045000049 -45.050518371999942,167.047692096000105 -45.049938663999967,167.084782381000082 -45.027984467999943,167.139952989000108 -45.054947434999974,167.19565886700002 -45.08211906799994,167.20414013900006 -45.08625131499997,167.229517900000019 -45.098608525999964,167.181680795000034 -45.141055190999964,167.156317006000108 -45.163526816999934,167.132103606000101 -45.138609023999948))) Author last name Last name of the Author Bradshaw Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Coombs, D.S. Abstract The Abstract for this thesis This report integrates results of field, petrographic, mineral-chemical, geochemical, and geochronological studies of amphibolite and granulite facies metamorphites and plutonic rocks in a large area (>1000 km2) of northern Fiordland. The area is dominated by dioritic orthogneisses belonging to a number of mapably distinct metaplutonic complexes, chief among them being the Early Cretaceous Western Fiordland Orthogneiss, the Early Cretaceous Indecision Creek Complex, and the at least in part Paleozoic Arthur River Complex. Regionally extensive granulite facies rocks are restricted to the Western Fiordland Orthogneiss (WFO). The bulk of this unit consists of a distinctive suite of two-pyroxene dioritic to minor monzonitic rocks which are concordantly intrusive into a varied country rock consisting of amphibolite facies metasediments and older orthoqneisses. Relict igneous textures in weakly recrystallized rooks indicate that the two-Pyroxene granulite tacies assemblage is inherited from the magmatic assemblage: it does not result from prograde dehydration of initially hydrous assemblages. These rocks have similar mineral compositions and whole rock chemical trends to mangeritic-jotunltic suites characteristic of many Precambrian granulite terranes. The two-pyroxene bearing granulitic rocks are locally criss-crossed by networks of veins and fracture systems in which hornblende is replaced in patchy and diffuse mesoscopic reaction zones by garnet granulite (garnet ± clinopyroxene + quartz). This replacement reflects local lowering of aH2O in response to influx of mantle-denved CO2 -rich fluidS along channelways formed by fractures. Local isofacial development of eclogitic rocks is attributed to dehydration of hornblendite. The granulitic rocks have experienced two major phases of deformation: i) an early synmagmatic phase which accompanied emplacement of the WFO and resulted in development of pervasive planar and linear fabrics: and 2) a later phase associated with development of locally extensive ductile shear zones and retrogression to amphibolite facies. The two phases were punctuated by a static, interkinematic period of crystallization, at which time the garnet granulite reaction zones formed. Metapelitic rafts within the WFO are migmatitic and have locally undergone extensive partial melting at sillimanite + K-feldspar grade to form granite gneiss. Some of these rocks preserve a Proterozoic Sm-Nd and Rb-Sr isotopic signature interpreted as the average age of the sediment source terrane. Some rafts of granitic to tonalitic composition have been extensively mobilized and now show complex intrusive relationships with the enclosing WFO. Two distinct phases of regional metamorphism are recognized. The first, a synkinematic high-T low-P event (M(1)), is responsible tor andalusite - sillimanite facies series metamorphism in the countrv rock: it is attributed to magmatic heat input into the "middle" crust by emplacement of the WFO and other voluminous Early Cretaceous intrusions. This was followed by a high pressure, largely interkinematic phase of metamorphism (M(2)) recorded in both the country rock and Western Fiordland Orthogneiss. Influx of CO2 and related development of garnet granulite and eclogite occurred during this event. Physical conditions of crystallization are estimated from mineral thermometry and barometry to be -650-700°C at 10-13 kb. Strongly zoned garnets coexisting with Al2SiO5 minerals in metapelitic rafts, country rock gneisses and contamination zones overprinting WFO, show a continuous core to rim increase in grossular content. Zoned clinopyroxenes coexisting with plagioclase and quartz show a core to rim increase in jadeite content. Computed phase equilibria in both systems are compatible with a pressure increase of >6 kb occurring during mineral crystallization. The increase in pressure is equivalent to onloading of material of ~20 km thickness over rocks already buried at depths of 15-20 km. Crustal thickening is attributed to overthrusting during a hitherto unrecognized major plate boundary collision event. Isotopic age constraints bracket collision, high pressure metamorphism, and final Uplift and cooling of the WFO to -300-400°C in the interval between -120 and 100 Ma. Uplift rates following high pressure metamorphism may have been as rapid as 3.5 mm/yr. In eastern Fiordland, essentially unmetamorphosed gabbrohorites of the Early Cretaceous Darran Complex are separated from rocks of the high pressure metamorphic terrane by a profound structural break (the Surprise Creek Fault). This boundary is represented by a narrow, steeply dipping zone of intense ductile deformation. Although some previous investigators have suggested that the gabbronorites represent the protolith of the granulite facies rocks exposed further west, it is shown here that the rocks not only have different ages, but also different isotopic and major and trace element characteristics suggesting derivation from separate mantle sources. The Early Cretaceous magmatic and tectono-metamorphic history of Fiordland has important implications for the evolution of relative plate motions and Mesozoic terrane, accretion along the New Zealand segment of the Gondwana margin. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3496">http://hdl.handle.net/10523/3496</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Franklin Mountains Fiordland northern Thesis description Number of pages, maps, CDs, etc. xvii, 379 pages, plates in back pocket Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1986Bradshaw Creator An entity primarily responsible for making the resource Bradshaw, John Yates Date A point or period of time associated with an event in the lifecycle of the resource 1985 Title A name given to the resource Basement geology, northern Franklin Mountains, northern Fiordland, New Zealand : with emphasis on the origin and evolution of Fiordland granulites Subject The topic of the resource Map Lithostratigraphy Geochemistry Igneous petrology Metamorphic geology Mineralogy Mesozoic Fiordland Granulites Fiordland Orthogneiss fluid inclusions geobarometry https://theses.otagogeology.org.nz/files/original/112154797c810c02e6121df01782c862.pdf 941f4c92b7831e3cfe477b60085d6adc Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((167.801917249000098 -46.933524157999955,167.800935740000114 -46.944838614999981,167.800200876000076 -46.953635467999959,167.757773444000122 -46.97920875799997,167.74404663100006 -46.987474919999954,167.737165038000057 -47.059346132999963,167.684472425000081 -47.056991516999972,167.68622090000008 -47.039149046999967,167.654595123000036 -47.037868405999973,167.659993271000076 -46.980791361999934,167.66394725400005 -46.938901808999958,167.664261219000082 -46.935886950999986,167.716260213000055 -46.938373871999943,167.735494164000102 -46.939287499999978,167.737441125000032 -46.91970459099997,167.753742014000068 -46.920364261999964,167.802886674000092 -46.92233534099995,167.802061597000034 -46.931862915999943,167.801917249000098 -46.933524157999955)) Author last name Last name of the Author Peden Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Reay, A. Abstract The Abstract for this thesis A reconnaissance geological map at 1:25 000 is presented for a previously unmapped Mason-Doughboy Bay area on the west coast of Stewart Island. Five granitoid plutons with faulted and intrusive contacts within the Rakeahua Batholith have been identified. The Walkers Hill Fault (new name) separates the Hellfire granitoid complex (Allibone, 1986) to the north from the Mason-Doughqoy suite (this study) to the south. The Mason-Doughboy suite consists of four plutons and the Gutter High Strain Zone (new name). The youngest pluton is the Adams Hill Leucogranite (new name) which intrudes the other three, Doughboy Bay Granodiorite (new name), Ernest Island Diorite (new name) and the oldest, Walkers Hill Diorite (new name). The Mason Bay Granodiorite (Allibone, 1987 and this study) to the north of the Walkers Hill Fault is younger than the post-emplacement tectonism, overprinted in the Mason-Doughboy suite. The Mason Bay Granodiorite is in faulted contact with the Walkers Hill Diorite. The Adams Hill Leucogranite forms an intrusion breccia with both the Walkers Hill Diorite and Doughboy Bay Granodiorite. Adams Hill Leucogranite dykes, also intrude the Doughboy Bay Granodiorite. Intrusive contacts between the Ernest Island Diorite and the Adams Hill Leucogranite are complex, and concurrently folded within the Gutter High Strain Zone. Major and trace element chemistry of the five plutons indicates I-type affinities, but suggests S-type character for granite tectonites from the Gutter High Strain Zone. The Gutter High Strain Zone is a localised narrow zone of predominantly ductile deformation, 1-2km wide. Development of the zone was accompanied by dynamic metamorphism, associated with movement, to greenschist facies conditions. A progressive sequence of granite - granite tectonites - mylonites, and calc-silicate metasediment, garnet quartzites and amphibolites are found within the Gutter High Strain Zone. The zone has regionally inferred significance. Syn-posttectonic deformation of the Gutter High Strain Zone is synchronous with post-emplacement tectonism of the Mason-Doughboy suite, these events are older than the Walkers Hill Fault. It is unclear if the intrusion of the Adams Hill Leucogranite is cause or symptomatic of the Gutter High Strain Zone, but is syn-posttectonic. Magmatic Cu-sulphide textures in globules from host Adams Hill Leucogranite dykes indicate immiscibile melts. Possible meteorite impact crater features proposed by Bishop et al. (1987 an unpublished preliminary report) are equally explained by natural geological and geomorphological phenomena. There were no 'potential' economic resources discovered in the field. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Mason-Doughboy Bay Stewart Island Thesis description Number of pages, maps, CDs, etc. 86 leaves : ill. (some col.), maps (some col.) ; 31 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1988Peden Creator An entity primarily responsible for making the resource Peden, Ross, 1961- Date A point or period of time associated with an event in the lifecycle of the resource 1988 Title A name given to the resource Dynamic metamorphism within the Rakeahua batholith, Mason and Doughboy Bay region, Stewart Island Subject The topic of the resource Map Geochemistry Metamorphic geology Structural geology Mineralogy Adams Hill Leucogranite Doughboy Bay Granodiorite dynamic metamorphism Earnest Island Diorite Gutter High Strain Zone Mason Bay Granodiorite Mason-Doughboy Suite Walkers Hill Diorite Walkers Hill Fault https://theses.otagogeology.org.nz/files/original/09f237e8b73fd6ed8afde68a2b2f2d0d.pdf ed13a3b6be84dbb2227ea246283736d2 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((170.995622179000065 -42.980229904999931,170.981263256000034 -42.989460644999951,170.982336461000045 -42.989479682999956,170.949548549000042 -43.010917973999938,170.9265565500001 -43.025936718999958,170.901371843000106 -43.042373964999967,170.884061017000022 -43.051589888999956,170.852974014000097 -43.06812612899995,170.849894831000029 -43.069763086999956,170.808608555000092 -43.091694935999953,170.804792259000124 -43.093752638999945,170.804869497000027 -43.089064707999967,170.804817125000113 -43.07528831299993,170.804766139000094 -43.061880357999939,170.804690317000109 -43.041949072999955,170.804658107000023 -43.033485111999937,170.804647756000122 -43.030765262999978,170.825590727000076 -43.018724133999967,170.844727264000085 -43.007713959999933,170.876134179000019 -42.989628402999983,170.879634138000029 -42.987611773999959,170.879777458000035 -42.987614445999952,170.888252189000013 -42.981036984999946,170.913156392000019 -42.969611768999982,170.95772458700003 -42.949140859999943,170.969687170000043 -42.943640897999956,170.974742980000087 -42.941315738999947,171.05443300100012 -42.90461292599997,171.088259788000073 -42.88900289299994,171.107074162000117 -42.880315888999974,171.108273963000102 -42.879761536999979,171.156570521000049 -42.857427791999953,171.288547467000058 -42.789149635999934,171.339713570000072 -42.763658160999967,171.345974838000075 -42.760535690999973,171.348868068000115 -42.763670563999938,171.352119868000045 -42.767193491999933,171.355133165000098 -42.770457593999936,171.356818636000071 -42.772283167999944,171.361741242000107 -42.777614204999963,171.35489524500008 -42.78133470299997,171.349934961000031 -42.78402985799994,171.340282010000124 -42.789273458999958,171.287590427000055 -42.817865887999972,171.27837442800012 -42.822688826999979,171.149662341000067 -42.889888560999964,171.129813828000124 -42.900225039999953,171.128653194000094 -42.900829244999954,171.127817192000066 -42.901264436999952,171.120209101000114 -42.90522436599997,171.088818462000063 -42.921551922999981,171.079310169000109 -42.926494088999959,171.07806430800008 -42.927141536999954,171.075868561000107 -42.928557465999972,171.006112721000022 -42.97348305,170.995622179000065 -42.980229904999931),(170.9176756170001 -42.988314537999941,170.958088844000031 -42.989047082999946,170.879927999000074 -42.987617250999961,170.9176756170001 -42.988314537999941)) Author last name Last name of the Author Rattenbury Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Norris, R.J. Cooper, A.F. Abstract The Abstract for this thesis Fraser Complex, replacing Fraser Formation, is a variably mylonitised suite of diverse igneous and high-grade metamorphic rocks in central Westland, New Zealand. Fraser Complex is bounded to the east by the Alpine Fault against Alpine schist of the Older Torlesse Terrane, and bounded to the west by the Fraser Fault and the Bald Hill Range Thrust against Karamea Terrane Greenland Group, granitoids and Cenozoic sediments. Interlayered amphibolite facies gneisses from Fraser Complex are collectively known as Mt Misery Metamorphic Suite, comprising the metapelitic garnet+biotite+sillimanite±kyanite±K-feldspar Hokitika Gneiss, the metabasic hornblende±epidote±biotite±garnet Doctor Creek Gneiss, and the migmatitic biotite+K-feldspar±garnet Hokitika Gneiss. The variability of garnet-biotite and garnet-hornblende geotherrnometry is attributed to retrogressive effects. Intrusive into Mt Misery Metamorphic Suite are Fraser Peak Granite and Doughboy Tonalite, S-type granitoids which are chemically distinct from Karamea and Separation Point Batholith granitoids, and have probably derived from melting of Hokitika Gneiss. Camptonite lamprophyre, trachyte and basalt dykes intrude Mt Misery Metamorphic Suite, Fraser Peak Granite and Dough boy Tonalite. Most of the dykes have a similar mineralogy and geochemistry to Hohonu Range dykes and may be early Cretaceous also. Enveloping Mt Misery Metamorphic Suite and igneous lithologies are numerous mylonite zones. Mylonitisation does not increase in intensity towards either the Alpine Fault or the Fraser Fault. Mylonite foliation generally dips steeply to the southeast, striking subparallel to the Alpine Fault trend. Mylonitic lineations generally plunge gently NE or SW, and the variability is attributed largely to sheath folding. Microstructural shear senses are predominantly dextral, although deformation is inhomogeneous. Mylonite protolithology can usually be sourced to Mt Misery Metamorphic Suite, Fraser Peak Granite or dyke lithologies. Albite-chlorite-actinolite-titanite, with some biotite recrystallisation, and deformation/recrystallisation of quartz and feldspar indicates mid greenschist facies conditions during mylonitisation. Mylonitisation postdates all dyke intrusions with one known exception, a basaltic dyke which truncates mylonite foliation and gives a minimum age of mylonitisation of late Miocene. The basaltic Smith Gorge dyke intrudes Doctor Creek Gneiss, not mylonite. Intrusion of lamprophyre, trachyte and most basalt dykes gives a maximum age of mylonitisation, of early-mid Cretaceous, rather than a minimum age as previously believed. High-grade gneisses occur throughout Westland and share similar metamorphic grade and mineralogy with Fraser Complex. Regional correlation of the gneisses as basement to Cambro-Ordovician Greenland Group is challenged by a 158 Ma U-Pb zircon age interpreted to date highgrade metamorphism of Fraser Complex. K-Ar dating of Fraser Complex gneisses and mylonites has indicated excess argon contributions to hornblende ages of 228-298 Ma, and possibly to whole rock ages of 45-91 Ma and to biotite ages of 44-61 Ma. The K-Ar biotite ages are incompatible with mid greenschist facies conditions during dextral strike-slip mylonitisation associated with Alpine Fault movement in the mid-late Tertiary. Uplift of Fraser Complex occurred along the Fraser Fault around 9 Ma, and ceased before deposition of Pliocene silts and conglomerates. The Fraser Fault is a steeply dipping zone of cataclasite, and is redefined to exclude locally crosscutting thrust faults. Initiation of movement and rapid uplift along the Bald Hill Range Thrust is recorded in Shadow Formation, a late Quaternary, periglacial marine silt and conglomerate sequence. Thrust surfaces underlying schist nappes up to 2 km northwest of the most recent Alpine Fault trace, with the Bald Hill Range Thrust are believed to be older, now inactive surface traces of the Alpine Fault which have migrated with time. Newly-discovered recent traces of the Alpine Fault show thrusting of Alpine schist over recent gravels. Two successively-underthrust gravels from Kaka Creek yielded radiocarbon ages of 3350 and 2600 years B.P., and give a minimum convergence rate across the Alpine Fault of 6.7 ± 1.5 mm/year. These ages extend an apparent 500 year return interval of large earthquakes in a relatively aseismic portion of the Alpine Fault. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3459">http://hdl.handle.net/10523/3459</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Westland central Thesis description Number of pages, maps, CDs, etc. xiii, 178 p Photos and Illus; 30cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1988Rattenbury Creator An entity primarily responsible for making the resource Rattenbury, Mark Sinclair Date A point or period of time associated with an event in the lifecycle of the resource 1988 Title A name given to the resource Fraser complex and alpine fault tectonics, central Westland, New Zealand Subject The topic of the resource Map Structural geology Metamorphic geology Igneous petrology Tectonics Alpine Fault Fraser Complex geochronology mylonitisation neotectonics https://theses.otagogeology.org.nz/files/original/a7ca55e34532d2fe1c732facb949b474.pdf 3414c3c56b7afd5f2c8844feb905dc4d Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((168.223649439701205 -44.683315621267596,168.340815005458268 -44.688356823877271,168.377561325552165 -44.77089256800965,168.330461431679936 -44.849875226854031,168.220507202841247 -44.835610988500392,168.223649439701205 -44.683315621267596)) Author last name Last name of the Author Kawachi Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Coombs, D.S Read, P.B. Abstract The Abstract for this thesis The geology and metamorphism of an area between Hollyford Valley and the western flank of the Richardson Mountains at the head of lake Wakatipu are described. The area covered in this study includes Rockburn, Routeburn, Caples River, a part of Greenstone River, most of the Ailsa Mountains, souther half of the Humboldt Mountains, Mt. Earnslaw massif, Mt. Alfred and Mt. Alaska. It will be loosely referred to as upper Wakatipu although it extends beyond the edges of the Upper Wakatipu Survey District. The area is divided into three sub-areas, western, middle, and eastern, by two major, north-striking faults. The western side of western sub-area is bounded by the Livingstone fault with a serpentinite of the Red Mountain Ultramafites lying immediately beyond. The western sub-area comprises four formations forming the eastern limb of a partly overturned anticline. The western limb of this anticline has been removed by the Livingstone fault. The Harris Saddle Formation, which is the lowest in the western sub-area sequence, consists mainly of mafic schists with minor pelitic, psammitic siliceous and ferruginous schists. The mafic schists are derived from mafic tuff, subordinate lava flows or sills, and tuff breccia. Distinct schistosity and lineation are developed. Locally, superposed folding is recognized. General attitude is N-S strike with an eastward dip. The thickness is over 3000m., the base being unknown. The Momus Formation, conformably overlying the Harris Saddle Formation, comprises a rather regular intercalation of psammitic and pelitic rocks, psammites predominating. Cleavage is distinct to poor and lineation is poorly developed or absent. Sedimentary structures such as load casts, slumping, and grading are common. The strike is generally northwards with eastward dips in the west, and westward dips in the east. Facing directions are invariably to the east. The thickness is about 3000m. Kay's Creek Formation, conformably overlying the Momus Formation, consists of mafic to intermediate volcanic sandstone and tuffite. Schistosity and lineation are almost absent. Sedimentary structures such as slumping and convolute lamination are abundant. Bedding generally strikes N-S with vertical westward dips. The thickness is about 1200m. at Caples River but appears to become thinner towards the north. Upper Peak Formation conformably overlies Kay's Creek Formation, and consists mainly of regularly intercalated psammites and pelites. Graded bedding is common. Almost isoclinal folding is conspicuous especially toward the east where the formation is in the fault contact with the Routeburn-Caples Ultramafite Belt. Axial plane cleavage and lineation are poorly developed. The strike is generally northwards, and the dip moderate to the west. The thickness is about 2000m. or less. Except for the Harris Saddle Formation, the same formations are found in the same order of superposition to the north of a fault running parallel to the Rockburn. Routeburn-Caples Ultramafite Belt, which separates the middle sub-area from the western sub-area is a structural belt running N-S, and noth hitherto recognized as a continuous unit. It is composed of very divergent rocks including serpentinitem rodingite, metagabbro, amphibolite, mafic lava, mafic, pelitic, and psammitic schists, and metasomatized mafic, pelitic, and psammitic schists. Hardening of pelitic rocks in contact with serpentinite is not uncommon. Serpentinite invariably occurs throughout the belt. Other rock types in the above list are interpreted mostly as tectonic inclusions in serpentinite though the amount of serpentinite rarely exceeds a half of the total exposed rocks. No dunite or peridotite is recognized. Many faults are observed bounding both eastern and western sides of the belt as well as within the belt. The width of the belt varies from less than a hundred meters to over 1000m. The middle sub-area is bounded on the west by the Routeburn-Caples Ultramafite Belt, and on the east by an inferred fault running N-S along the eastern flank of the Humboldt Mountains. This sub-area is occupied by the Bold Peak Formation which consists mainly of psammitic rocks with minor pelites and rare mafic rocks. The structure appears to by synclinal. Cleavage is weakly developed and lineation is nearly absent. Thickness is about 2000m. The eastern sub-area is occupied by rocks of the Haast Schist Group. They consist mainly of pelitic and lesser amounts of psammitic schists with minor mafic and siliceous schists. The Haast Schist Group of this sub-area forms a syncline gently plunging to the south. Schistosity and lineation are well developed. Quartzo-feldspathic laminae are well developed in the lower part of the sequence. Thickness in this area is about 2500m. The base is not known. The rocks of the western sub-area may possibly be lithostratigraphically correlated with the Upper Permian rocks of the Livingstone fault. If this correlation is correct, it is notable that the thickness in this area is much greater than on the western side of the Livingstone fault. Twenty-nine representative rocks of mafic, pelitic, psammitic, ferruginous, and siliceous compositions from the area have been chemically analysed. The psammites are characterized by rather low SiO2 and K2O, high TiO2, Al2O3, total iron, and Na2O compared with averages in the literature. The pelitic rocks are characterized by high Na2O and low K2/Na2O ratio. High Al2O3 in psammitic rocks may be explained by high percentage of micaceous minerals in the matrix. SiO2 and Al2O3 are inversely related for more mature rocks of pelitic and psammitic composition in the literature, a relation not well shown by some of the rocks from the present study, suggesting low maturity. All types of analysed rocks of the present study have conspicuously higher Fe2O3/FeO ratios than analyses of higher grade rocks (i.e. above biotite grade) of the Haast Schist Group. Total iron content of pelitic and psammitic rocks in this study is higher than most of the analysed rocks from the New Zealand geosyncline. Analysed mafic rocks of the upper Wakatipu area plot in all three fields of alkali-olivine basalt, hight alumina basalt, and tholeiite in the (Na2O+K2O)-SiO2 diagram of Kuno (1959, 1968). The K2O/Na2O ratio of mafic rocks is fairly low. Plots on the AFM diagrams show similarities to the differentiation trend of of tholeiites and mildly alkaline rock series. Nearly two-thirds of all analysed mafic rocks have normative quartz. Relict clinopyroxenes in mafic and psammitic rocks have been analysed by electron microprobe analyser (EPMA). They are rich in SiO2 and poor in Al2O3 and plot within non-alkaline and normal-alkaline host rock fields of LeBas (1962). Five metamorphic zones in increasing metamorphic grade are discriminated on the basis of mineralogical changes. Zone I is characterized by the occurrence of prehenite and is found within a limited area around Mt. Bolpland-Bold Peak in the middle sub-area. Zone II is defined by the occurrence of lawsonite with no actinolite or prehnite. The Upper Peak, Kay's Creek and upper part of the Momus Formation belong to this zone. Zone IIIa is characterized by actinolite and predominantly blue-green pumpellyite. Lower parts of the Bold Peak and Momus Formations and the Harris Saddle Formation belong to this zone. Alkali-amphiboles mantled by actinolite occur in this zone. Zone IIIb is characterized by actinolite and predominantly colorless pumpellyite. The higher members occupying a synclinal trough in the local development of the Haast Schist Group belongs to this zone. Zone IV is characterized by the absence of pumpellyite, epidote being abundant. The lower part of the local development of the Haast Schist Group belongs to this zone. Zone I corresponds to Ch.1 or transitional between Ch.1 and 2 in textural zonation, Zone II partly to Ch.1 and partly to Ch.2, Zone IIIa partly to Ch.2 and partly Ch1.3, Zone IIIb to Ch1.3 and Zone IV to Ch1.4. Quartz is nearly ubiquitous and is absent only in such rocks as metasomatized rocks adjacent to serpentinite. All examined plagioclase feldspars are found to be albite of low temperature structural state. Muscovite is ubiquitous for all Zones except in few mafic rocks. Two muscovites are analysed by electron probe microanalyser (EPMA). The celadonite content is found to be 23.4-29.0%. Refractive indices of muscovites from all five zones are similar and show rather low values compared with those of eastern Otago and the Sambagawa zone indicating lower celadonite content than in those terranes. Basal spacing of muscovites do not show much difference irrespective of the differences of host rock or metamorphic grade. The only polytype detected is 2M, No 1M or 1Md micas have been found. Epidote is common throughout the area, especially in mafic rocks. Epidotes from nine rocks have been partially analysed for Al2O3, FeO3 and CaO by EPMA, and a number of epidotes have been examined for Fe+3 content by Myer's (1965, 1966) X-ray diffraction method. Chemical and X-ray analyses seem to match very well. The frequency maximum in epidote composition lies at about Fe+3/(Fe+3 + Al) = .29, in contrast with Brown's (1967) data for Eastern Otago, which show a maximum at 0.19 in rocks of slightly higher grade than those of the upper Wakatipu area. An abrupt change in the epidote composition may thus occur in rocks of grade intermediate between the two areas. This would correspond roughly to the Ch1.3-4 boundary and the disappearance of pumpellyite. Refractive indices of epidote may be slightly higher than those of hydrothermal, metasomatic and other environments. Lawsonite has anonymously low refractive indices. This may be interpreted by low Fe content of the analysed material which is otherwise quite normal in composition compared with other lawsonites in the literature. Pumpellyite is predominantly blue-green in Zones I, II, and IIIa while it is predominantly colorless in Zone IIIb. It does not occur in Zone IV. The change of color suggests less ferriferous (more aluminous and/or more magnesian) compositions with increasing metamorphic grade. This trend is supported by a few measurements of optical properties. Prehnite is identified in Zone I, but is not studied further. All the carbonates examined in this study are calcite. No aragonite, dolomite, etc. are found. Actinolite occurs in Zones IIIa, IIIb, and IV. Six actinolites are analysed by EPMA. There is no obvious correlation between the composition of actinolites and metamorphic grade. The composition of actinolite seems to be largely controlled by the host rock composition. On the 2V-Y diagram trend of actinolite may be said to be barroisitic (subcalcic), which is one of the characteristic metamorphic minerals in the glaucophanitic metamorphic terranes (Miyashiro, 1968). The alkali-amphiboles from Zone IIIa are analysed by EPMA. They are riebeckite and Mg-riebeckite in composition. Glaucophane and crossite are identified optically, but they invariably occur mantled by actinolite or other alkali-amphibole species. Thus, it is concluded that glaucophane and crossite are unstable while riebeckite and Mg-riebeckite are stable in Zone IIIa. Crossite occurs in amphibolite in the Routeburn-Caples Ultramafite Belt. Ferristilpnomelane is one of the commoner minerals throughout Zone I to IV. Ferristilpnomelane occur only rarely. Chlorite is one of the commonest and most abundant minerals irrespective of host rocks or metamorphic grades. Si-Al substitution is very limited while Fe-Mg substitution is fairly large. The composition of chlorite is largely related to that of host rock, thought it may be also related to metamorphic grade. Thus chlorite in psammitic and pelitic rocks have higher Fe content than in mafic rocks. The basal spacing of chlorite shows a good inverse correlation with Al content. The basal spacings in psammitic and pelitic rocks are smaller than in mafic rocks corresponding to higher Al content in the former. Variation in chlorite composition with metamorphic grade is not clear, although comparison with the chlorite from eastern Otago (Brown, 1967), where metamorphic grade is slightly higher than this area, suggests that chlorite may become less magnesian, more ferroan, and more aluminous with increasing grade of metamorphism. Insufficiant data are obtained to discuss partition of elements between coexisting mineral pairs. Tourmaline is commonly found in pelitic and psammitic rocks though it is minor in amount. Axinite occurs as veinlets in rocks of Zones I, II, and IIIa. It was not found in the Haast Schist Group (Zones IIIb and IV). One analysed garnet in Zone IIIa is anomalously rich in andradite molecule. Spessartine (Zone IV), and grossularite and hydro-garnet (both in Routeburn-Caples Ultramafite Belt) are also recorded. Optical properties of relict hornblendes and clinopyroxenes are determined. Judging from Mg/Fe ratio estimate by optical properties the source rocks of relict hornblendes may be intermediate rocks. Biotite, zircon, allanite, epidote, muscovite, garnet, apatite, tourmaline, and orthoclase are among the relict minerals recorded. Serpentine minerals in the Routeburn-Caples Ultramafite Belt are identified as orth- and clino-crysotile. No antigorite nor lizardite has been found. Talc, picotite, magnetite, and asbestiform tremolite are not uncommon. The metamorphic mineral assemblages in each Zone are given. Possible chemical reactions defining isogrades are discussed. The isograd between Zones II and IIIa are discussed in some detail using uH2O-uCO2 diagram for the system Al2O3-(Mg, Fe)O-CaO-H2O-CO2. P-T conditions of this area are discussed referring to the latest experimental data by Liou (in press a, b). The present area is considered to be the first recorded example of the facies series prehenite-actinolite, and greenschist facies. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Lake Wakatipu Thesis description Number of pages, maps, CDs, etc. xxii,219,Illustrations, Tables, Maps (folded in pocket) ; 27cm Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1970Kawachi Creator An entity primarily responsible for making the resource Kawachi, Y. Date A point or period of time associated with an event in the lifecycle of the resource 1970 Title A name given to the resource Geology and metamorphism near the head of Lake Wakatipu. Subject The topic of the resource Map Geochemistry Metamorphic geology Mineralogy https://theses.otagogeology.org.nz/files/original/6e92e432aab5cf82e1b71abbf3aac22c.pdf 337d7901f167abee4e7b8f920deb9ae1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((167.589182872000038 -45.129208670999958,167.543631172000119 -45.130419058999962,167.524545568000121 -45.056757791999985,167.521113179000054 -45.043490254999938,167.64234400700002 -45.039251233999948,167.658252799000024 -45.127121700999965,167.658291904000066 -45.127337365999949,167.658233059000054 -45.127338977999955,167.589182872000038 -45.129208670999958)) Author last name Last name of the Author Morrison Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Wood, B.L. Abstract The Abstract for this thesis A layered gabbro overlying granodiorite and a sequence of hornblende-bearing and quartzofeldspathic gneisses have been described from an area of 25km2 about Lake Hankinson and the N.W. Arm, Middle Fiord, Lake Te Anau. The gneissose rocks represent a westward younging sequence of basic and semibasic (basic-intermediate) lavas and tuffs overlain by quartzofeldspathic and possibly calcareous sediments. This sequence has been completely recrystallised by amphibolite grade metamorphism. South of a roughly E-W trending line through the centre of the area (the Howitt Peaks Fault) gneissose rocks are uncommon. Instead, a flat-lying sequence of differentiated ultrabasic rocks, approximately 550 feet thick, overlie felsic igneous rocks of a dominantly granodioritic composition. This sequence is in various stages of recrystallisation under the influence of amphibolite grade metamorphism~ The degree of recrystallisation is largely dependent on the composition of the original rock. Study of a range of secondary phases by optical and X-ray methods, suggest that mineral composition is also largely dependent on the composition of the original rock. Two phases of faulting accompanied by retrogressive metamorphism and crush zones disrupt all lithologies and give rise to intermixing of adjacent rock types. On the basis of tectonic position and associated rock types the N.W. Arm gabbro is thought to be genetically related to the Mt Luxmore Ultrabasics of the South Fiord, Lake Te Anau. Comparisons with Central Fiordland gabbroic bodies are also considered. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. North-West Arm Middle Fiord Lake Te Anau Thesis description Number of pages, maps, CDs, etc. 88 leaves : illus. maps (fold) ; 29 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1973Morrison Creator An entity primarily responsible for making the resource Morrison, Gregg W. Date A point or period of time associated with an event in the lifecycle of the resource 1973 Title A name given to the resource Geology of an area about N.W. Arm, Middle Fiord, Lake Te Anau Subject The topic of the resource Map Igneous petrology Metamorphic geology Structural geology gabbro gneiss granodiorite layered gabbro ultramafic rocks https://theses.otagogeology.org.nz/files/original/1cdf584d9cc6703a29b0906c01d85bf6.pdf 2208d4dbfb8034ca3b3069bade4af148 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((167.524545568000121 -45.056757791999985,167.567776805000108 -45.057924913999955,167.589182872000038 -45.129208670999958,167.591698727000107 -45.137574876999963,167.500653986000088 -45.148688074999939,167.45255927200003 -45.105911456999934,167.500504435000039 -45.056101594999973,167.524545568000121 -45.056757791999985)) Author last name Last name of the Author Ryder-Turner Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Coombs, D.S. Abstract The Abstract for this thesis An area covering approximately 25 square kilometres between the N.W. and S.W. Arms of Lake Te Anau is described. The area is divided into two terranes on the basis of differing styles of tectonic deformation, metamorphism and rock types. The line of demarkation falls on the Howitt Peaks Fault - a major northeast-southwest striking feature. The rocks to the northwest include schists, quartzofeldspathic- and hornblende bearing- orthogneisses, while the rocks to the southeast consist of gneisses, a layered gabbro, hornblende tonalites and diorites, tonalites, granodiorites and granites. A Late Stage granite is intruded on both sides of the fault. At least three and possibly four tectonic/deformation events are recognized : one producing a pervasive foliation and lineation; the second, activation of large scale faulting; the third, reactivation and uplift. Two stages of metamorphism are also recognized : Tuhuan (?) amphibolite facies metamorphism and Rangitata prehnite-purnpellyite (?) facies metamorphism. The possibility of formation of the foliation and lineation as a result of pre-Tuhuan deformation as distinct from the development of syn-Tuhuan lineation is postulated. The tectonic-"stratigraphic" position of the area in Fiordland with respect to the models of Gibson (1979) and Oliver & Coggon (1979) is discussed and it is suggested that it may straddle the lateral equivalent of the Doubtful Sounq and Western Manapouri Provinces. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Middle Fiord Lake Te Anau Thesis description Number of pages, maps, CDs, etc. 128 leaves : ill. (some col.), maps ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1980Ryder-Turner Creator An entity primarily responsible for making the resource Ryder-Turner, Alastair George. Date A point or period of time associated with an event in the lifecycle of the resource 1980 Title A name given to the resource Geology of an area between Northwest and Southwest Arms, Middle Fiord, Lake Te Anau. Subject The topic of the resource Map Igneous petrology Metamorphic geology Structural geology gabbro gneiss Howitt Peaks Fault https://theses.otagogeology.org.nz/files/original/7fa6b51ef0ff06c097a12e8b7cae2321.pdf 367be1ed6a192eaf915c74dc6cad2dfe Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Named locality Named locality describing the field area location. Annear Creek Thesis description Number of pages, maps, CDs, etc. 118 p. : ill. (some col.), maps ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology of Annear Creek. Subject The topic of the resource Map Igneous petrology Metamorphic geology Sedimentary petrology Creator An entity primarily responsible for making the resource Pillai, D. D. L. (Deirdre Dhana Lakshmi) Date A point or period of time associated with an event in the lifecycle of the resource 1981 Identifier An unambiguous reference to the resource within a given context 1981Pillai detrital pyroxenes Trabeculatia