1 10 7 https://theses.otagogeology.org.nz/files/original/24438451e0d9206828554e765d2c1a03.pdf ea85ca099228c5b157350a1ca1df6ee4 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 ((168.074051681000014 -44.925488453999947,168.06958549400008 -44.931779880999954,168.067791513000088 -44.937080935999973,168.067194752000091 -44.938844997999979,168.067110221000121 -44.939093817999947,168.045070294000084 -45.004139145999943,168.038998114000037 -45.022035910999932,168.038281010000105 -45.024146320999932,167.998419775000116 -45.022717446999934,167.998122141000067 -45.022704570999963,167.972862057000043 -45.021789257999956,167.934813269000074 -45.020403230999932,167.941222882000034 -44.949907359999941,167.942878502000099 -44.931686147999983,167.944770442000049 -44.910838077999983,167.944922339000072 -44.910695966999981,168.009969203000082 -44.849492717999965,168.024092060000044 -44.836178357999984,168.02453317700008 -44.835760136999966,168.002592425000103 -44.822752441999967,167.988016037000079 -44.814104320999945,168.00462789900007 -44.799927073999982,168.013086319000081 -44.792702259999942,168.023030076000055 -44.795805424999969,168.032534198000121 -44.798767010999939,168.033542663000048 -44.79908095199994,168.078543978000084 -44.813105723999968,168.084082748000014 -44.793607572999974,168.08782644900009 -44.793767212999967,168.093405548000078 -44.797588447999942,168.117886105000025 -44.814341333999948,168.11579296900004 -44.835663550999982,168.11320202100012 -44.839939648999973,168.100595910000038 -44.861135933999947,168.093130446000032 -44.883703814999933,168.083760581000092 -44.911635544999967,168.083744295000088 -44.911828679999985,168.080796267000096 -44.91598086099998,168.074051681000014 -44.925488453999947)) Author last name Last name of the Author Williams Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Landis, C.A. Abstract The Abstract for this thesis In the upper Eglinton area, the Eglinton Volcanics (Permian) are intruded by plutonic rocks mapped as the Mackay Intrusives. A sharp fault contact separating the Eglinton Volcanics from crystalline rocks of the Fiordland Complex, i.e. separating New Zealand's eastern and western provinces is no longer recognised in this area and rocks mapped as Darran Doiorite by Wood (1962) are now mapped as Mackay Intrusives. The Eglinton Volcanics are mapped as two terranes separated by an elongate body of quartz-bearing diorite, the Mistake Diorite. The eastern (Plato) terrane, which consists largely or entirely of marine deposits, comprises a steeply dipping, east-younging sequence of volcanogenic sediments of basaltic to andesitic composition, intruded by abundant basaltic dikes. Four formations are defined: the basal (Gondor) formation consists of predominantly massive, coarse grained pyroclastic detritus and includes an Atomodesma limestone member; subsequent formations (Consolation, Divide and Fergus) are mainly of sand to silt grade rocks and include turbidites. Fossils from two new localities include brachiopods - Ambikella, Sulciplica transversa, Aperispirifer (?), Spir{ferellina and bivalves - Atomodesma marwicki, Etheripecten and Conocardium (?). They confirm an Early to Middle Permian age for the Plato terrane. Rocks of the western (Largs) terrane are largely of andesitic to dacitic composition and predominantly volcaniclastic, although massive andesite bodies are mapped at either end of the terrane. Fossils, limestones and turbidites are unknown, but strongly hematitic rocks, restricted to minor occurrences in the Gondor Formation of the Plato terrane, are common. The terrane may be partly of terrestrial origin. Basaltic andesite and andesite dikes are fairly common but several distinctive dike lithologies found in the Plato terrane, e.g. augite porphyrite, Cr-diopside ankaramite and microdiorite, are absent in Largs rocks. The southern part of the terrane appears to be folded into a tight syncline, however the structure is not completely resolved and formal formations have not been established. Age of the Largs terrane and its relation to rocks of the Plato terrane remains unknown. It is herein assumed to be of Early to Middle Permian age, though a younger, e.g. Mesozoic origin, cannot be discounted. Eglinton rocks are shown to be of tholeiitic to calc-alkalic affinity and are considered to be the products of Lower Permian island arc volcanism which accumulated either as separate arcs (i.e. Plato and Largs), or as separate portions of the same arc, approximately 180-190 km above a descending lithospheric plate. Low-grade burial metamorphism occurred, mainly during Permian time and parts of the Largs terrane have been hornfelsed during subsequent Mackay intrusion. Aspects of regional metamorphism are also recognised and this can probably be regarded as a Mesozoic development. Three metamorphic zones are mapped: a prehnite-pumpellyite-epidote zone (I) where metamorphic grade is prehnite-pumpellyite transitional to pumpellyite-actinolite schist facies; an actinolite-epidote zone (II) occurring west of zone I with assemblages of the chlorite zone of the greenschist facies; a biotite-actinolite-epidote zone (III) restricted to the northwestern part of the Largs terrane where the terrane is intruded by gabbroic and dioritic Mackay rocks. Mineral assemblages in zone III are compatible with those of the greenschist facies as well as the albite-epidote and hornblende-hornfels facies of contact metamorphism. Textural modification is not widely developed in either terrane. The Mackay Intrusives are subdivided into six units. The Gunn Dolerite comprises two intrusive bodies in the northern Plato terrane, its age is unknown but it may be as old as Early Permian. Mistake Diorite is the name given to the elongate, relatively homogeneous body of medium to coarse grained quartz-bearing diorite which separates the Largs and Plato terranes. K-Ar ages of 208, 208, 186, 182 and 180 m.y~ have been obtained from it and are interpreted as indicating a Triassic age of intrusion. The Hut Plutonic suite, comprising mainly white leuco-granite, flanks part of the western margin of the Mistake Diorite and is inferred to be of similar age to the Mistake body. Hollyford, Nurse and Glade suites are mapping units and are not necessarily of genetic significance, i.e. together they comprise a genetically related series of granitoid to gabbroic rocks characterised by diverse composition on outcrop scale, medium grainsize, zoned plagioclase and lack of widespread deuteric alteration. Each suite comprises a mappable rock mass in which one lithology or a narrow range of lithologies predominates. Leuco-gabbronorite predominates in the. Hollyford Gabbroic Suite, a unit mapped in the upper Hollyford area. Four K-Ar ages range from 130-136 m.y. (uppermost Jurassic to Cretaceous) and a cross-cutting trondhjemite dike gives concordant biotite and muscovite ages of 113 m.y. Rocks of the Nurse Plutonic Suite, mapped in the Nurse-Brandywine area, are granitoid to dioritic in composition. They are undated, but as rocks of identical composition and texture intrude Hollyford gabbronorites, a Cretaceous age seems likely. The Glade Plutonic Suite comprises texturally and compositionally diverse rocks in which dioritic types dominant. K-Ar ages of 189 and 112 m.y. on a hornfelsed andesitic inclusion recrystallised (?) leuco-granite respectively, suggest, in conjunction with field relations, a complex intrusive history. Microprobe analyses of rock forming minerals observed in a representative selection of plutonic and volcanic rocks are reported and discussed. In particular, Mg-Fe distribution coefficients (KD) have been calculated for coexisting pyroxenes from a series of gabbronorites across the Hollyford suite.KD changes systematically form east to west across the suite as the Fe:Mg ratio of the pyroxenes increases. This trend, and the concentration of olivine-bearing rocks in the eastern part of the suite, suggest that the gabbroic rocks may comprise a gravity-differentiated intrusion with its base towards the east. Several major north-to northeast-trending, high-angle faults are mapped. The Hollyford Fault marks the eastern margin of the Eglinton Volcanics and is considered to be a fundamental tectonic break. Skelmorlie Fault has offset Tertiary sediments of the Annick Group, perhaps by several kilometres in a sinistral strike-slip sense and/or by several hundred metres vertically (west side up). The Glade Fault, a newly described feature, has produced 5-6 km of apparent dextral offset in the Hut suite leuco-granite. The Eglinton Fault zone, mapped along part of the eastern margin of the Mistake Diorite, is characterised by gneissic mylonite containing sparse almandine garnet. A newly discovered sliver of Tertiary sediments faulted into the Plato terrane in Plato Creek, as well a.s Tertiary strata unconformably overlying Mackay and Eglinton rocks west of Mt Eglinton, are described briefly. Distinct differences in conglomerate provenance are noted within the Tertiary sequence near Mt Eglinton. Although a tectonic contact between New Zealand's eastern and western provinces is not recognised within the area mapped, it is concluded that the two provinces did not lie in their present relative position in the Permian and Early Mesozoic. If this conclusion is correct, then the present juxtaposition of the two provinces means that their mutual contact is, or was, tectonic. It is considered that the contact lies in approximately the same position as the median tectonic line as proposed by Landis and Coombs (1967) and that it has been subsequently obscured for most of its length by Mesozoic plutonism and Cenozoic tectonism and sedimentation. It is proposed that the term "median tectonic line" be retained for this contact between provinces of contrasted pre-Cenozoic geological evolution, notwithstanding the likelihood that the - contact probably originated as a zone of tectonised rock rather than as a sharp break, as originally mapped. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5936">http://hdl.handle.net/10523/5936</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Eglinton upper Thesis description Number of pages, maps, CDs, etc. 305 leaves : illus. (part col.) ; 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 1976Williams Creator An entity primarily responsible for making the resource Williams, John Greville. Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Geology of the Upper Eglinton area : status of the median tectonic line. Subject The topic of the resource Map Geochemistry Igneous petrology Lithostratigraphy Mineralogy Paleozoic Eglinton Volcanics K-Ar dates Mackay Intrusives Median Tectonic Line Permian fossils https://theses.otagogeology.org.nz/files/original/be095795415bec7685d322a2a3640187.pdf 18313591273229175de86d4465c30882 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 ((167.570686954000053 -45.398933611999951,167.569121879000022 -45.398032611999952,167.564841430000115 -45.395568132999983,167.560881846000029 -45.393288058999985,167.565383946000111 -45.389815632999955,167.576939889000073 -45.380899862999968,167.612995018000106 -45.382905839999978,167.633587769000087 -45.384046363999971,167.634579418000044 -45.384101190999957,167.633503704000077 -45.3849494899999,167.614253964000113 -45.400123657999984,167.613339691000078 -45.400844082999981,167.603757158000121 -45.408393326999942,167.596736330000113 -45.413922624999941,167.570686954000053 -45.398933611999951)) Author last name Last name of the Author Sise Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Cooper, A.F. Abstract The Abstract for this thesis Mapping has shown that the igneous rocks of Mt. Luxmore form a complex, roughly elliptically shaped intrusion cutting the Fiordland gneisses. Distribution of the main rock types, which range from plagioclase-bearing dunite to leuco-gabbro and norite, is irregular in detail, but outcrops of each rock type within the complex form linear, north~east striking belts, parallel to a prominent aerial photographically defined lineament. The ultramafic portion of the suite has been intruded by various hornblendebearing dykes and veins which represent injection of late-stage hydrous differentiates. The eucritic and gabbroic rocks were severely uralitized by the postmagmatic introduction of calcium-rich fluids. Electron microprobe analyses of the primary phases indicate distinct though slightly irregular cryptic variation, and iron-enrichment trends for the olivines and pyroxenes. Plagioclase is found in all igneous rocks and ranges in composition from (An 84-An9z) in the ultramafic-mafic assemblages to An 54 in the more leucocratic norites. Olivine shows a cryptic variation from Fo69 to Foal. The chrysolitic olivine-calcic plagioclase assemblage links plagioclase-bearing dunite on the one hand and anorthosite on the other. Clinopyroxenes in the eucrites have moderately high Alz0 3 content; the jadeite and Ca-Tschermak's components 2 indicate crystallization at around 8-io kb. Temperature estimates using the Wood and Banno two pyroxene geothermometer (905°-982°) are lower than those for similar ultrabasic- basic igneous complexes and suggest continued equilibration during slow cooling in a regional metamorphic environment. Amphiboles are chemically the most varied of the essential mineral constituents; they occur as primary poikilitic igneous phases, and as secondary uralitic aggregates replacing pyroxene and olivine. Analyses of magnetite-ilmeriite pairs demonstrate that all the ilmenite is of secondary origin and temperature estimates indicate the range over which oxidation of magnetite-ulvospinel solid solution- ceased, rather than the temperature of crystallization of the igneous host rocks. Coronas between adjacent olivine and plagioclase grains are spectacularly developed in Mt. Luxmore rocks. The presence of orthopyroxene in the inner shell adjacent to olivine, and a vermicular intergrowth of amphibole and green spinel in the outer shell adjacent to plagioclase, has been confirmed by electron microprobe analyses. It is considered that the coronas have formed during slow isobaric cooling at pressures above 6 kb .1 Whole rock analyses of representative rock types by electron microprobe suggest that all igneous rocks of the Mt. Luxmore intrusion are comagmatic, and that the parental 3. magma was sub-alkaline, high alumina in character and having an overall tholeiitic affinity. The Mt. Luxmore intrusion lacks the structural and mineralogical characteristics of stratiform and zoned complexes and more closely resembles alpine-type intrusions, at least in tectonic setting. The mineralogical indications are that the rocks cooled slowly at a depth of approximately 20 km. They may represent the root zone of a volcano which experienced periodic injection of partly crystalline mush from depth during its history, to give the irregular appearance of the complex. At some stage before the Tertiary the igneous rocks were uplifted and then exposed on the sea bed during the Tertiary. Mt. Luxmore is one of a series of broadly similar basic plutonic bodies which form magnetically disinguishable belts in eastern and central Fiordland. A process of crustal accretion during a prolonged and intermittent period of subduction is suggested as a possible mechanism by which these plutonic zones might have originated. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Mt Luxmore Fiordland Thesis description Number of pages, maps, CDs, etc. 218 leaves : illus. (part col.), 2 maps 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 1976Sise Creator An entity primarily responsible for making the resource Sise, John Reginald. Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Mineralogy and geochemistry of the ultrabasic-basic rocks of Mt. Luxmore, Fiordland, New Zealand. Subject The topic of the resource Map Geochemistry Mineralogy amphibole coronas olivine plagioclase pyroxene https://theses.otagogeology.org.nz/files/original/8ad63cd96a6704b9517b359f88dd80af.pdf 1e77ecad9d723967eee3083c89bc33c6 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 ((170.806216422803317 -45.173344319788661,170.81105356604823 -45.073405011732987,170.923236713845398 -45.075739197704273,170.91554060127217 -45.176345547094058,170.806216422803317 -45.173344319788661)) Author last name Last name of the Author Sikumbang Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Campbell, J.D. Abstract The Abstract for this thesis The area studied for this project lies between Maheno to Oamaru, South Island, New Zealand. The area extends from Weston and Kia Ora 1n the north and to the Kakanui River (near Maheno) in the south. The type locality for the Maheno Limestone was previously defined by Gage (1957) at South Cape Wanbrow, Oamaru. In the present study a complete sequence of the Totara Limestone 1s defined southeast of Clark's Flour Mill, Reidston. Field work was carried out mainly from the middle to the end of February, and the area was revisited occasionally during weekends. The main object of the research was to establish the stratigraphic succession, the relationship to the Waiareka Volcanic Formation, and the nature of the Totara Limestone. This largely involved measuring the sequences of strata and collecting samples. More than one hundred and fifty representative samples were collected mainly in the Totara Limestone, but also from the Waiareka Volcanic Formation. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Oamaru Thesis description Number of pages, maps, CDs, etc. 109 leaves : illus., maps 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 1976Sikumbang Creator An entity primarily responsible for making the resource Sikumbang, Nafrizal. Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Study of the Eocene Totara limestone near Oamaru. Subject The topic of the resource Map Micropaleontology Sedimentary petrology Paleontology Cenozoic bryozoa Foraminifera Totara Limestone https://theses.otagogeology.org.nz/files/original/11db9ee6de42ad11c85c1b5e291c8fef.pdf def273a2f0e2de329d72a6f5245518a8 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 ((167.152742982000063 -45.45205727299998,167.158917695000014 -45.461698977999959,167.048962152000058 -45.552452899999935,167.043740065000065 -45.552266308999947,166.8712491550001 -45.545968031999962,166.862230454000041 -45.50237008299996,166.784772689000079 -45.486032769999952,166.707871432000047 -45.46975151099997,166.766175872000076 -45.356891693999955,166.806778454000096 -45.306704357999934,166.811936656000057 -45.300320997999961,166.829336475000105 -45.278775954999958,166.835699590000104 -45.27089212,166.892910575000087 -45.285816028999925,166.914470263000112 -45.291430545999958,166.958196703000112 -45.310659520999927,167.037788376000094 -45.345584079999973,167.07407283100008 -45.361472911999947,167.089234876000091 -45.374124695999967,167.118501370000104 -45.398524141999985,167.152742982000063 -45.45205727299998)) Author last name Last name of the Author Oliver Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Cooper, A.F. Coombs, D.S. Abstract The Abstract for this thesis This thesis reports the detailed study of 700km2 of high grade metamorphic terrain in Doubtful Sound, Fiordland, and a more general synthesis of Fiordland geology as a whole. Geophysical evidence from the Doubtful Sound area, i.e. gravity (Woodward 1972; and work by J. Coggan and the writer), seismic refraction (Davey and Broadbent, pers. comm.), earthquake data (Smith, 1971; Scholz et al., 1973) and geothermal activity suggests that the Doubtful Sound area is comprised of lower crustal rocks and that mantle rocks are less than 10km below the surface. The rocks have been brought to the surface along an active high angle thrust fault running along the line of the Fiordland west coast. Detailed geological mapping has been carried out between Doubtful Sound and Breaksea Sound. Six mapping units were recognised which are referred to as the Malaspina, Turn Point and the Waipero Cove Gneisses constituting the basement,. and separated from the cover sequence of Kellard Point and Deep Cove Gneisses by the Doubtful Sound Thrust. The Straight River Granite intrudes Deep Cove Gneisses in the Dagg Sound area. The basement units are sub-divided on metamorphic criteria rather than on conventional lithostratigraphic grounds. The Malaspina Gneisses are feldspathic hornblende granulites with the assemblage antiperthitic plagioclase + olive green or, brown hornblende + clinopyroxene + orthopyroxene + ilmenite and magnetite intergrowths + apatite~ biotite. Anorthositic veins or thicker pegmatites studded with garnet porphyroblasts and large euhedral hornblende crystals cross-cut the feldspathic hornblende granulites often forming a network. The feldspathic gneiss in contact with these anorthositic veins has a reaction zone parallel to the margins of the veins. The mineral assemblage in the reaction zone is antiperthitic plagioclase + garnet + clinopyroxene + quartz + rutile + apatite. The garnet forms distinctive coronas around clinopyroxene. This assemblage is diagnostic of the high pressure granulite facies. Ultramafic gneisses interbanded with the feldspathic gneisses are interpreted as synmetamorphic intrusive sheets; they are predominantly hornblendites with bands and patches of hornblende eclogite. Some hornblendite sheets are layered with olivine-rich cumulate layers at their base; one such hornblende harzburgite contains hornblende lherzolite nodules. Malaspina Gneisses make up the Granulite Zone. The Turn Point Gneisses are partially retrogressed equivalents of the Malaspina Gneisses, feldspathic gneisses have two assemblages: (1) plagioclase +hornblende+ relict clinopyroxene + ilmenite and magnetite intergrowths + biotite + sphene + epidote + quartz + apatite; (2) plagioclase + garnet + relict clinopyroxene + quartz + biotite + hornblende + rutile + sphene +epidote + apatite. These two assemblages have formed by the partial hydration of feldspathic hornblende granulites and garnet granulites respectively. Ultramafic gneisses show similar reaction textures as the feldspathic gneiss:- sodic clinopyroxenes show symplectic breakdown to form less sodic clinopyroxene or hornblende; garnet has kelyphitic rims of hornblende and plagioclase. The Turn Point Gneisses make up the Transition Zone. The Waipero Cove Gneisses are amphibolites; they have similar mineral assemblages to the Turn Point Gneisses but all clinopyroxene has been replaced by hornblende and biotite. Ultramafic gneisses do not have garnet or clinopyroxene. The Waipero Cove Gneisses make up the Amphibolite Zone. The Malaspina Gneisses are distinguished by the presence of orthopyroxene in certain lithologies; the Turn Point Gneisses are distinguished where orthopyroxene has been replaced by amphibole and biotite and where relict clinopyroxene is still present. The Waipero Cove Gneisses do not contain pyroxene. Malaspina, Turn Point and Waipero Cove Gneisses show relict igneous layering and xenoliths of microgabbro, diorite, and in one case a schist-like fragment; thus the basement feldspathic gneisses are interpreted as plutonic rocks. The sequence Malaspina, Turn Point, and Waipero cove Gneisses represents increasing hydration or amphibolitisation of the granulite facies basement under amphibolite facies conditions. The cover sequence lies structurally above the basement: the Kellard Point Gneisses are made up of amphibolite facies metasediments and thick marbles with calc-silicate gneisses which have been intruded by pre-or syn-metamorphic acid to ultrabasic intrusives. Where marble is found in contact with the basement then it is always mylonitised; where marble is absent then an epidotised, actinolitised crush zone is found separating massive Waipero Cove Gneisses of the basement from banded quartzofeldspathic and micaceous migmatic metasediments of the Deep Cove Gneisses. This horizon of - sheared gneisses and marbles has been mapped throughout the Doubtful Sound area and is interpreted as a decollement zone called the Doubtful Sound Thrust. The Deep Cove Gneisses are only distinguished from Kellard Point Gneisses by their lack of thick marbles although it is realised that this may be controlled by sedimentation or structure. By reconstructing sediment types it is suggested that the cover sequence represents a (off-shore) continental shelf environment. The Straight River Granite is thought to have been intruded late in the amphibolite facies metamorphism of the cover. The Doubtful Sound Area has had a complex structural evolution. The basement had undergone at least two deformations during M1 granulite facies metamorphism before the cover sequence was thrust westward over the basement along the Doubtful Sound Thrust. The cover sequence experienced M2 amphibolite facies metamorphism at the time of thrusting and was thrown into a· series of recumbent folds while the basement below the Doubtful Sound Thrust was hydrated and amphibolitised. Other thrusts (the Mt. Troup Thrust in the east and the Straight River Thrust in the west) lie above and parallel to the Doubtful Sound Thrust. Later mylonitisation occurred along deep fault zones in the western half of the area and the various thrusts were reactivated. Conditions allowed the M3 growth of chlorite. The thrusts and retrograds in the basement were warped into open synclines and anticlines during this time. The M2 amphibolite facies metamorphism and migmatisation of the cover sequence is thought to have been dated by Aronson (1968) who estimated a zircon age of 320-350 m.yr. for a gneissic granite boulder from Deep Cove which this writer considers to be representative of the granitoid portion of nearby outcrops of gneissic metasediment. This date corresponds with the Devonian to Carboniferous Tuhua Orogeny. Since the basement was retrogressively metamorphosed from granulite to amphibolite at this time, the basement granulites -must have originally crystallised earlier in. the Tuhua or during a pre-Tuhuan orogeny. A Precambrian Malaspina Orogeny is invoked to account for the M1 granulite facies metamorphism. Thus the Fiordland granulites may be old Precambrian similar in age to the Indian, Australian, and Antarctican granulites of Gondwanaland. The Rangitata Orogeny is probably represented in Doubtful Sound by uplift approximately 95m.y. ago (Aronson 1968, biotite Rb-Sr age from Deep Cove) and mylonitisation along the Mesozoic Alpine Fault. These movements were repeated during the Kaikoura Orogeny which commenced 4 ~ 2m.y. ago (Sheppard et~ 1975). Whole rock geochemical studies show that the feldspathic basement gneisses have the composition of rather sodic gabbroic diorites which have transitional characteristics between calc-alkalic and mildly tholeiitic magmas. Ultramafic gneisses have the composition of basanites and olivine tholeiites. It is not thought that the feldspathic and ultramafic gneisses were once both of the same magma series. The cover rocks analysed show a wide variation composition from granite through to peridotite and from sandstone through to limestone. It is postulated that a hydrothermal fluid, evolved in the cover through metamorphic dehydration reactions during progressive amphibolite facies metamorphism, infiltrated some 2km into the basement and was absorbed during the transformation of granulite to amphibolite mineralogy. Infiltration metasomatism occurred and the following elements were relatively enriched in the basement: Si, K, c, H, u, Th, Hf, Cs, Nb,. Y, Rb; the following elements were relatively depleted the basement: Al, Fe, Mg, Ca, P; the following elements remained constant: Na, Ti, Mn, Pb, Cu, Ni, Zn, Sr, Zr, R.E.E. Depletion occurred in a zone 0.5km thick below the Doubtful sound Thrust by back diffusion through the infiltrating fluid. Metamorphosed igneous and sedimentary rocks have been distinguished using Misra diagrams, i.e. Ti02 versus (FeO + Fe203/FeO + Fe2o3 + MgO) and Ti02 versus MnO diagrams. Quartz, K-feldspar, plagioclase, amphiboles, garnet pyroxene, olivine, biotite, chlorite, muscovite, scapolite, epidote, tourmaline, sphene, rutile, ilmenite, magnetite, limonite, spinel, serpentine, staurolite and carbonate have been analysed on the electron microprobe. Distribution of Fe, Mg, Ti, and Na between various mineral pairs has been studied. Using the Wood-Banno two pyroxene geothermometer combined with the Raheim-Green garnet-clinopyroxene geothermometer/geobarometer it is concluded that the basement granulites equilibrated during metamorphism at about 775°C and 8kb load pressure (::IV 30km depth); amphibolite facies gneisses of the cover and basement equilibrated (and the rims of basement granulite minerals re-equilibrated) at about 660°C assuming a pressure of 7kb (:::IV 23km depth). Kpgn~gcpx and KDgn~ghbl values from other granulite and amphibolite facies areas compare well with the basement granulite and cover amphibolite in Doubtful Sound. KDgn~gcpx, K gnt-hbl K gnt-bio and K hbl7bio values of rims of mineral D Mg ' D Mg ' D Tl . pairs from the basement compare well with KD values for cores and rims of the same mineral pairs from the cover, i.e. the was partially retrogressively recrystallised under same conditions of metamorphism as the cover. After consideration of field relationships and the and trace element chemistry (including R.E.E.) it is that hornblende granulite gneisses originated through partial melting of hydrous garnetifeous peridotite at depths greater than 70km; the magma rose through the upper mantle and fractionated mainly olivine and garnet. The differentiated magma intruded the lower crust and crystallised as a gabbroic diorite batholith. Regional metamorphism culminating at 775°c 8kb formed granulite facies assemblages. Water pressure less than total pressure but was sufficiently high to allOW a small amount of partial melting. The anorthositic melt so formed segregated into a tensional joint system forming pegmatites. The composition of the gabbroic diorite (now feldspathic hornblende granulite gneiss) adjacent to the pegmatites was altered such that oxides,orthopyroxene, and hornblende simultaneously became unstable in the presence of plagioclase and reacted to form feldspathic garnet granulite gneisses. Model reactions are presented explain the omphacitic nature of the clinopyroxenes found in feldspathic and ultrabasic gneisses. During the granulite facies metamorphic episode, partial melting of hydrous mantle peridotite produced a water saturated basanitic liquid which rose, fractionating olivine (and clinopyroxene) such that when it intruded the lower crust and cooled, it crystallised largely as hornblendite. Under conditions of granulite facies metamorphism it is likely that some residual melts from the hornblendites crystallised as garnet rich hornblende eclogites, and that other hornblende logites were produced by subsolidus reactions between blende and plagioclase in the hornblendites to produce. The status of the basement rocks with respect to the etamorphic facies concept is confused. Most workers would sign the feldspathic garnet granulites to a high pressure ulite subfacies and assign the hornblende granulites to lower pressure or lower temperature granulite subfacies; eclogite rocks could be assigned to the eclogite facies. lica undersaturated xenoliths in the granulites have amphibole facies mineralogy. However this work has shown that all se basement rocks equilibr9ted together under the same conditions of 775°C and 8kb and between 4 and 8kb H2o pressure. The geophysical, geological and geochemical evidence support the hypothesis that the segment of granulite facies amorphosed crust presently exposed in Doubtful Sound was ally part of the lower continental crust. On the basis of the occurrence of certain minerals including kyanite, sillimanite, margarite, spinel, staurolite the K0 values of various mineral pairs it is proposed that cover rocks have been metamorphosed at 675°C and 6.5kb (load sure= H20 pressure). Under these conditions it is likely quartzofeldspathic metasediments partially melted to give migmatite veining. The regional geology of Fiordland is discussed with repspect to the basement and cover relationship discovered in Doubtful Sound. It is thought that the Doubtful Sound ·Thrust can probably be traced from Resolution Island to the Pembroke Valley: a distance of 160km. The mapping of formations in Fiordland by Wood (1960, 1962, 1966) is discussed and rejected and a new regional scheme is proposed. The geology of Fiordland is compared and contrasted with Nelson and Westland. The significance of the Alpine Fault in Fiordland is discussed. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/4513">http://hdl.handle.net/10523/4513</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. Doubtful Sound Fiordland Thesis description Number of pages, maps, CDs, etc. 2 v. : illus., maps (maps and charts in pocket) ; 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 1976Oliver Creator An entity primarily responsible for making the resource Oliver, Grahame J. H. Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource High grade metamorphic rocks of Doubtful Sound, Fiordland, New Zealand : a study of the lower crust. Subject The topic of the resource Map Igneous petrology Metamorphic geology Structural geology Mineralogy amphibolite basement-cover relationship eclogite granulite https://theses.otagogeology.org.nz/files/original/4e8000b625ebc0ab42d27b15ae85495d.pdf 42e54c74cee77e2578d3ef0c55501f19 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 Author last name Last name of the Author Morris Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Duggan, M.B. Abstract The Abstract for this thesis Campbell Island owes its origin largely to Upper Miocene volcanism. Volcanic flow rocks cover approximately two thirds of the island, having been derived from a volcanic centre to the west of the island, which has been removed by marine erosion. Onland flows have been modified by radial drainage channels developed about the volcanic centre. The flow rocks are dominantly hawaiitic to mugearitic,with a smaller number of more evolved flows of the alkali olivine basalt lineage. Intrusive rocks are mineralogically and chemically similar to the flow rocks. Both are characterised by mineralogical and chemical homogeneity, but textural variety. The igneous rocks are believed to have been derived from melting of the mantle to produce an alkali basaltic parent,which has undergone subsequent fractional crystallisation,producing the observed rocks. There is little post eruptional structural modification, apart from the tilting of the Filhol Peak block. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Campbell Island Thesis description Number of pages, maps, CDs, etc. 74 leaves : illus., 2 maps 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 1976Morris Creator An entity primarily responsible for making the resource Morris, Paul (Paul Andrew) Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Igneous geology of Campbell Island, Southwest Pacific Ocean. Subject The topic of the resource Map Igneous petrology Mineralogy dyke hawaiite-mugerite flows https://theses.otagogeology.org.nz/files/original/6c3d52fafa41acccc650e252ce7508ea.pdf bf0cd8671611bcfad6340e6f8c1b326b 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 ((169.324672369190665 -46.640010217113463,169.328263145141506 -46.617621825305292,169.379499629133051 -46.618899676620167,169.377482405908495 -46.641339504291388,169.324672369190665 -46.640010217113463)) Author last name Last name of the Author Geary Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Carter, R.M. Abstract The Abstract for this thesis Chaslands Mistake is a prominent headland lying on the south-east Otago coast, within N.Z.M. sheets S183 and S184. Access is from the Balclutha-Invercargill coast road, via the Cathedral Caves track and Waipati Beach. Approximately one hour is required from the road to the Chasland's Headland; the Waipati Estuary can only be forded at half to low tide levels. The only previous detailed geological work done at Chaslands Mistake is that by Speden (1971 ), described in "Geology of the Papatowai Subdivision", Geological Survey Bulletin 81, which covers the northern side of the headland. This report presents the results of a (somewhat) more detailed investigation into the geology of Chaslands Mistake, with particular emphasis on the sedimentary geology. The sediments in the coastal section are described. using the (now well established) technique of facies analysis (e.go Reading, 1970; Selley, 1970). The spatial distribution of facies associations is indicated on a map of Chaslands Mistake and facies relationships in a vertical sequence shown on Section A. The geography of the headland is dominated by high coastal cliffs along the southern coast. Away from the coast the land is covered by thick bush which makes detailed sedimentary work impractical on anything other than the coastal exposures. The map of Chaslands Mistake was drawn from 1 inch : 60 chain topographic mapping sheets obtained from the Lands and Survey Department. Detail was added from air-photos N.Z.M.S. Runs 15 95/39-41. Topographic heights have been transformed to metric units. Various localities have been informally named(i.e. South Bay), and location numbers (i.e. hoc 1) added for ease of reference. Early maps of the Catlins area depict the Jurassic sedimentary rocks in biostratigraphic terms. This approach was also used in the New Zealand Surveys 1:250 000 Geological Map of New Zealand. The first worker to attempt a formational subdivision of Cat1ins geology was Speden (1971), whose comprehensive bulletin provides a lithostratigraphic framework for the rocks of the district. The Chaslands Mistake area falls at the extreme southwest of the area mapped by Speden, only partly lying within his map boundaries. Chaslands Mistake lies on the southern limb of the Fortification Syncline, one of several parasitic fold.s mapped by Speden on the "south limb" of the regional Southland Syncline. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2798">http://hdl.handle.net/10523/2798</a> OURArchvive access level Open Access Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Chaslands Mistake Thesis description Number of pages, maps, CDs, etc. 84 leaves : illus., maps 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 1976Geary Creator An entity primarily responsible for making the resource Geary, Geoffrey Clive. Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Jurassic sediments at Chaslands mistake. Subject The topic of the resource Map Lithostratigraphy Mesozoic Jurassic https://theses.otagogeology.org.nz/files/original/14518bda0bbc0f9d7b05c2831c2bd704.pdf 6e57a5703f801ebfd6e35539ba9314a4 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 Author last name Last name of the Author Beggs Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Landis, C.A. Abstract The Abstract for this thesis The sedimentary and metamorphic rocks of Campbell Island, 600km south of New Zealand, comprise a low-grade schist basement, very restricted in outcrop (the Complex Point Group), unconformably overlain by a 30m terrigenous clastic unit of late Cretaceous and Paleocene age (the Garden Cove Formation) which is in turn conformably overlain by up to 200m of Eocene and Oligocene partly chertified pelagic limestone (the Tucker Cove Limestone.) The youngest sedimentary rocks make up the Shoal Point Formation, which consists of up to 200m of pyroclastic sediments of late Miocene age, unconformably overlying the Tucker Cove Limestone. Details of the stratigraphy, petrography, sedimentology and paleontnlogy of the above sequence are presented and the regional significance of parts of the study is discussed. A summary of the geological history of Campbell Island and the surrounding area is presented in the final chapter. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2863">http://hdl.handle.net/10523/2863</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. Campbell Island Thesis description Number of pages, maps, CDs, etc. 77 leaves : illus., maps 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 1976Beggs Creator An entity primarily responsible for making the resource Beggs, John McIntyre, 1953- Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Sedimentary and metamorphic geology of Campbell Island, Southwest Pacific Ocean. Subject The topic of the resource Map Metamorphic geology Sedimentary petrology Complex Point Group limestone pyroclastic rocks terrigenous unit