1 10 6 https://theses.otagogeology.org.nz/files/original/8ac1fe40550315b20ae04c65d4912fde.pdf f16d4d1f777592b5130f0ddb7e3550d9 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 ((170.753682231000084 -44.708638358999963,170.753463203000024 -44.714017662999936,170.748205876000043 -44.713903039999934,170.725562236000087 -44.71340173699997,170.715766650000091 -44.713354789999983,170.715308649000121 -44.722231465999982,170.702876873000037 -44.72206889399996,170.702689695000117 -44.730748310999957,170.670184109000047 -44.730199597999956,170.670464972000104 -44.712492133999945,170.703099966000082 -44.712949031999983,170.703593806000072 -44.700332404999983,170.704150882000022 -44.686154998999939,170.691761635000034 -44.685744285999931,170.691908952000063 -44.681218773999944,170.692059052000104 -44.676702313999954,170.692865618000042 -44.676727253999957,170.704444967000086 -44.677067963999946,170.704737933000047 -44.677078222999967,170.705681334000019 -44.650259349999942,170.730798192000066 -44.650664750999965,170.732490595000058 -44.605436076999979,170.770174484000108 -44.606261490999941,170.768255261000036 -44.651085049999949,170.756050174000052 -44.650666619999981,170.753682231000084 -44.708638358999963)) Author last name Last name of the Author Ford Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A. Lee, D. Coombs, D.S. Fordyce, E. Cox, S. Abstract The Abstract for this thesis In this report, emphasis is placed on defining lithologies and their extent, along with geochemical consideration of the sedimentary rocks and their metamorphic equivalents. Torlesse sedimentary rocks in the Meyers Pass area are mapped. Paleontological methods and biostratigraphy nave also received much attention. Atomodesmatinid bivalve macrofossils, redeposited in flysch, and. Permian conodonts (Neogondelella and Xaniognathus) in an allochthonous block of siliceous pelagite, are recorded. Conglomerates are largely composed of acid extrusive and hypabyssal clasts dominating sedimentary clasts, all in a matrix of similar derivation and including plentiful rip-up clasts of a finer nature. Isoclinal folding of siltstone/fine sandstone and pelagite in an allochthonous block is noted as being inconsistant with the degree of deformation in other mapped areas. The allochthonous block was deformed during accretion, while all sediments were later deformed by a regional metamorphic event. The sedimentary assemblage is consistant with tectonic accretion along an active continental margin, with the acid igneous fraction derived of subduction related plutonic activity. The dominance of extrusive types within this acid fraction, and minor amount of burial metamorphic types may indicate a young or newly reactivated subduction complex. No true acid plutonics are present as clasts in the conglomerates. Tectonic considerations relevant to incorporation of the Torlesse sediments into the New Zealand geotectonic framework are considered. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Meyers Pass South Canterbury Thesis description Number of pages, maps, CDs, etc. xi, 180 leaves : ill. (some col.), maps (some col.) ; 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 1995Ford Creator An entity primarily responsible for making the resource Ford, Philip Barry. Date A point or period of time associated with an event in the lifecycle of the resource 1995 Title A name given to the resource Geology, micropaleontology and geochemistry of permian sediments at Meyers Pass, South Canterbury, New Zealand / by Phil Ford. Subject The topic of the resource Micropaleontology Geochemistry chert conodont pelozite Torlesse https://theses.otagogeology.org.nz/files/original/51763eddf2a96423b7951f2d7ebb8c6e.pdf 1dafc07784a3585f36a911c6ebbbb88d 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 Bejnar Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Abstract The Abstract for this thesis Two aspects of geochemistry were studied: rock analysis tenchique by f 1 u01-escence spect.rometr·y I and geocherni stry of New Zealand cherts and x-t-aY the ir met amorphic equivalants. A. Analysis. The analyses were done using a manually.operated Phillips PW1540 spectrometer and PW1130 generator. The effects the various parts of the system had on analysis were studied. Appropd.ate adjustment, selection, and/or setting of the generator, x-ray tube, sample, sample holder, sample chamber , collimator, analysing crystal, counter, goniometer, and electronics \Jere selected for each of 19 elements (major oxides: Si02 1 Al203 1 Fe203, HgO I cao, K20, Ti02, P205 and Hn02; trace elements: As, Ba, Cr, Cu, Ga, Ni, Rb, Sr, Y, and Zn) . The amount of 1 eeway avai lab! e on many parts z.hov1ed some to require fine tuning, while others needed only quick adjustment to obtain optimum operating conditions. The variation2! when using the pulse height selection radically changed after some modifications were done on the preamplifier by the department technicians. Analyses of pressed powder briquette samples were compared with synthetic standards made from pure chemicalz.l intern:ttional reference material and other Previously anc.lysed rocks. Nearly all briquettes were prepared using a mowiol solution binder. The quality of bt-ibuettes pressed against srlass was superior to those Pressed against poli2.hed steel. No consistent variation of analyses clue to texture quality I however, t-7as recognised from a study of several duplicate briquettes. Two sets of f~e ssed powder briauettes were analysed. One set was of Whole rock cru2.hed pm¥ders. The other was of hydrofluoric acid treated xiii. t hese va lues were modifi ed t o r efl ect t he composition of the whole po~.Jd e r s ; -- rock. Although the t wo sets of data obtained shm-led a good statistical correl ation, many i ndividual el ement an3.lyses from the two set~. of data ~.; e re di fferent by more than a factor of 2. Such discrepencies may be clue to differ ences in grain size <the acid treated samples being much finer), mica flake ori entati on , differences in mass absorbtion eff ects (especially for Si02 and ]1,1 203) and/or inhom·ogeneity of acid h -eated sampl es (differ ent coloured fact ions of the residue migrated to different parts of the teflon basins; collection of all the residue was impossible, and mi xing what was collected may not have been adequate). Utilization of concentration techniques is seen t o be productive for elements whose abundances are near or below their detection limits (P205, As and Ga). A new method of background determination was utilized for most tr·ace · elements using one background determination. Several synthetic .~.tandards devoid of a trace element were used to determine a curve which \-lould predict the background count rate at the peal~ position using a background position count rate. For most trace element analyses, all background count rates were modified before subtracting background from the peak count rate. For most elements, this provided better analysis curves than st:cai.ght peal< minus background analyEds curves. The precision of analysis on eight bdquettes of one powder sample was better than 5 percent (relative) for most major element mddes, and better than 50 percent for most trace elements. I el ement analyses were employed,) <More stringent controls on, major %. I ., llccuracy of r esults was studied by several means. Mn02 concentration va lues for this project were higher than some independant laboratory ~hecl~s, f. ~ and s imilar to others . The concentrat ions , as det &rminetl, are well above typica l cher t anal ys es , as det erm ined by a compari son with va lues in the ~- ""'· xiv. literature. Cu, Ni and Y concentration value:::; determined for this project -·"'vL:- t-1ere usua lly lm.;er ti)an independant l aboratory checks. Cr concentrations · determined for this project were much higher than tho.'::'.e for chert and pelagic sediments and rocks reported by most other authors. Independ~nt checks usually indicated that the Cr concentration2. determined for this project were high, but sti 11 \.Jell above typical chert concentrations. Cu analyses seem to have been adversely affected by Mo l< a lpha Compton Scatter from the Mo x-ray tube. B. Geochernistry . Sixty samples of chert and quartz schist (or 'metachert') were collected £1.-om seventeen areas acro.ss the South Island and southernmost North 1.::\land. Some of the r~e samples were obtained from the GF:ology Department collection or from other field workers. Another 30 quartz schist analyses from one outcrup were a.lso studied (Dowz.e , et al., in prep.) l1o.st samples \-1ere from within the Torlesse or Haast Schist assemblage2.. Field information r egarding textural gr.:tcle , 'country rock' association, and colour of each specimen was obtained. Rigorous sample selection criteria were ~ mployed to avoid weathering, l eaching, ve ining and other contaminating phc:-nomena. A number of chert samples whict! were obvious ly, or possibly, mi xed with adjacent rock material, and several non·-chert samples, ~.Jere Emalysed for comparison purposes. , Chert ,<Y:Jmp l es are a mi xture of .dlica and other material. Although the si lica is almost always of biogenic origin, the evidence for this is · frequently l os t due to l ocalized mobilization and complex recrystallization of I lhe s ilica. The portion of biogenic s ilica in a sample necessary for the sample to appear cbert-·1 H'e E:'.eerru:; to be as 1 01-.' a:::. ten percent. (This means t en percent biogenic silica added to a c~ay whi ch would typically have about EiO per cent non-biogenic s .ll ica. ) The ari thrnE:'ti c aver·age of biogenic s i 1 i ca determined by geochemi ca l wethods was . 54 percent. The moda l averag~ was 84 PE>rc e::nt . The cday faction \~ithin chect most closely re.::~E~mbles typical deep ~ ea clay. XV, The elements in nearly all of the samples of chel..-t and quart: schist foll0\·1 n- ~-~ina l e r_~eochemica l pattern . :;J The ratios between all 'clay' faction l ements except Cu and Cr are fairly cons istant at ctll abundance l evels . e usuallY strong corre lation indicates that these elements are depos ited independantly of the deposit i on of si li ca. Cr has a distinct negative corre l ation with the clay facti on el ements and a positive correlation with Si02. Cu analy;:.es, as deter rn ined , 2.how no strtmg correlation with other elements . This pattern is fairly distinct from non-chert samples. The chert samples are readily separat ed from terri qeneous samples (siltstones and The quartzofc ldspathic schists) using Mn02-Al203 and Mn02-Ti02 variation diagrams. Some trace element abundances r e l ate to crystal chemical behavioral similarities: Ga to Al203, Rb to K20 and Sr to CaO. The ' clay' f act ion e l ements within chert come from several sources : deep sea clay, continental material, volcanic ash, ·and el ements mobilized in hydrotherma l emanations . Within limits, ttae relative contribution from these sources vary. Thr;:y 11i 11 vary lar~r el y due to the environment of cleposi ti on . Sampl es depos i t ed close to co~t1ne ntal 1nargins will have a greater ~ortion of terrigeneous detritus t han sa~ples deposited in isol ated bas ins . Samples deposited cl ose to oceanic spreading centres would be relatively enriched with hydrogeneous metals. A number of geochernicaJ pctrameters. \-;er·e u2.ecl to :::.eparate the various ! field loc.:d i ties from each CJther with r e.spi:·ct to the contributi on of deep ~\ea clay ard ·:·-.··t p -.r·· · r: ; .•. R' ,,o '>··r·~· · ·'- (t:'f'I!J j) ) }' ]· ·t· " - ·- 1 Th . 1 1 d F Al 1 b:t::::. · c, .• l ,_-' L.. 1~'·- L·t:·1.li.J,-:-. .lt., r:. l\ .• - .1 · ,e rnct .E.l. J. ct • ese 1 ne uc e · eralio and ~\l op:=! , Hn··Ti ratio ~1 n•l. slope, f\::/Ti r at i o, Jl.li <Al +Fe+Hn ) ratio, <Fe/Ti ) /( Al/ C Al+Fc~Hn )) ratio , Fe/(Mg~Kl r a tio, Mn/CMg+K) r at io and biogenic ~rt· - · lcn C ;; l 02- '. ?. l ?CJ3+Fe 203 ·1 !+JCl+Cc.~i+ i<20 +T .i. Cli~+P2o~;+l·ln02) :~:2 . 011. 00). .. ·. • I, xvi. The aver age· for each parameter of the sampl es f r om field at-eas \.Jere tabulated. The relative rank for each field area tended to be consistent for all par ameters. Chert 2.ampl es associated with gt-eenschists tended to indicate a closer depositi onal proximity to EPRD-like .sediments than other samples. Individual samples which did not conform to the inter-element b.-ends also indicat ed a closer EPRD-like associati on than the more normal samples. The stratigcaphically lower sampl e~. from Jl.rrow Junction (Dowse, et al., in pr ep.) indicate a much stronger affinity to EPRD-like sediments than the overlying quartz schist samples. Several possible theories for this ate presented. The Fe/Ti versus Al/CAl+Fe+Mn) variation diagram indicates that the clay fact ion in chert samples contain 0 - 25 percent EPRD-like material and 75 - lOO percent typical deep sea clay. Clear geochemical indicators for othel.- 2.ource sedirnents were not ~:. tudied. The elements most strongly associated with terrigeneous influenced chert deposits are Al203, K20, Ti02, Ga and Rb. The elements most strongly associ ated with hydrothermal eminations are Mn, Fe, Ni and Zn. Ne compelling t r ends were noted due to increa.sed textural or metamorphic grade . Geochemical variation correlated with colour of specimens, but the s i gni.ficance of this was not determined. Red chert samples tend to be dch in Fe203 I.Jhile black chert samples tend to be en:dchecl (relative to Fe203) in Mno2. Host chert from the "Nm-1 Zealand geosyncline" was formed in a t er-r i 9eneous 2.ecl iment. starved environment. by the deposition of biogenic Si lie.:-,. The other maj or component in the . chert is deep sea clay rich in hyd ro0eneous metal s . Rat es of s ili ca , cl av. an.d hydrogeneous metal depos ition Department The department where the student is studying primarily. Geology Thesis description Number of pages, maps, CDs, etc. 137, 90 leaves : ill. (some col., some folded) ; 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 1983Bejnar Creator An entity primarily responsible for making the resource Bejnar, Tor John Stark. Date A point or period of time associated with an event in the lifecycle of the resource 1983 Title A name given to the resource Analysis and geochemistry of chert. Subject The topic of the resource Geochemistry biogenic silica chert clay hydrogenous metals https://theses.otagogeology.org.nz/files/original/2070279034ce16ce24d885b90226979b.pdf efd58e56bbd61f25497b6b492cbc9d9d 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 ((168.364956336000091 -45.357266186999937,168.385202804000073 -45.354383746999986,168.413915730000099 -45.378613042999973,168.400785952000092 -45.392079131999935,168.382173339000019 -45.391244091999965,168.384736924000094 -45.378389464999941,168.363881837000122 -45.365335250999976,168.364956336000091 -45.357266186999937)) Author last name Last name of the Author Pound Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Norris, R.J. Abstract The Abstract for this thesis An area of 5 square km is mapped in Caples group rocks in the Eyre Mountains, where a Shear Zone Melange (SZM) is enclosed within Caples group sandstones. The SZM is a linear feature, the trend of which parallels the NW-SE striking and W-dipping enclosing strata. The SZM is composed of four lithologies enclosed in a matrix. The matrix is composed of phyllonites, mylonites, or highly sheared sandstones. The inclusions are spilites, altered microgabbros, sandstones and banded cherts, all of which form individual lensoid bodies wrapped by the matrix rocks. The width of the SZM varies from 0.5-1 km. The eastern boundary of the SZM is defined by a sharp contact between the SZM phyllonites and coarse enclosing sandstones to the east. The western boundary of the SZM is gradational; the phyllonites pass westward through 1 km of variously well cleaved, uncleaved or protomylonitized sandstones. Some of the sandstones to the west of the SZM are olistostromal in origin. The banded chert inclusions are layered, both megascopically and microscopically, and could originally have been siliceous turbidites. A conodont retrieved from the cherts revealed a probable lower Carboniferous age. Relict clinopyroxenes from the altered microgabbros show affinities with within-plate alkalic magmas. Metamorphic grade (Pre-Pump and Pump-Act) is basically similar within the SZM and the enclosing sandstones, and is indicative of contemporaneous metamorphism. The SZM is interpreted to be a localized zone of shearing within a linear belt of volcanics that probably extends as least 10-15 km further to the SE. The SZM could represent the remains of a seamount assemblage that has been highly sheared during subduction accretion. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Eyre Creek Thesis description Number of pages, maps, CDs, etc. x. 156 p. : ill., 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 1982Pound Creator An entity primarily responsible for making the resource Pound, Katherine S. (Katherine Shakespear), 1958- Date A point or period of time associated with an event in the lifecycle of the resource 1982 Title A name given to the resource Shear zone melange in Caples rocks, Eyre Creek. Subject The topic of the resource Map Metamorphic geology Sedimentary petrology Structural geology banded chert clinopyroxene relict https://theses.otagogeology.org.nz/files/original/75e97b1b4f7cbc8a9747fade0f7b1f70.pdf 75d80cd0b631b900d1b89c5eb861374a 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 ((170.596584263000068 -45.336973920999981,170.656064123000078 -45.305477226999983,170.673870611000098 -45.338403647999939,170.65764106600011 -45.360285570999963,170.626340852000112 -45.37001915299993,170.596008361000031 -45.365789448999976,170.596584263000068 -45.336973920999981)) Author last name Last name of the Author Bogie Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Coombs, D.S. Abstract The Abstract for this thesis A series of major north-west trending faults, which make up the Waihemo Fault Complex, provide a boundary between textural zone 1 and 2A semi-schists, which have been metamorphosed to the prehnite-pumpellyite metamorphic facies, and textural zone 3B and 4 schists which have been metamorphosed to the greenschist facies. Original lithologies can be recognized within the semi-schists. Sandstone and siltstone are predominant with minor argillite, limestone, chert, tuff and conglomerate. Most of the minor lithologies are contained within argillite-siltstone sequences which are contained within sandstone-siltstone sequences. Limestone outcrops as massive beds, lenses and interbedded with chert and/or chloritic slate. Two types of occurrences of chert were found; those interbedded with limestone and red chert enclosed within argillite. Tuff was found as chloritic slates interbedded with limestone and as prehnite-rich beds enclosed within siltstone. Conglomerate occurred as lenses within interbedded sandstone-siltstone sequences and as a large irregular mass within an argillite-siltstone sequence. The quartzofeldspathic schists south of the Waihemo No. 2 Fault are overlain by pre-Eocene quartz conglomerates and sands which are overlain by Bortonian glauconitic marine silts. These are in turn overlain by plio-pliestocene remnant piedmont terraces and loess. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Waihemo Thesis description Number of pages, maps, CDs, etc. 58 leaves : col. illus., maps (2 fold. col. 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 1978Bogie Creator An entity primarily responsible for making the resource Bogie, Ian. Date A point or period of time associated with an event in the lifecycle of the resource 1978 Title A name given to the resource Geology of the mid-part of the Waihemo fault complex, North Otago. Subject The topic of the resource Map Metamorphic geology Sedimentary petrology Structural geology chert greenschist limestone prehnite-pumpellyite Waihemo Fault Complex https://theses.otagogeology.org.nz/files/original/e4a0dea3bd65426147608a887c296804.pdf f56c94fb02c3d40dba26e6568f421050 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 ((171.044311836751405 -44.116279021172488,171.088587346195197 -44.117266834042972,171.103378618880583 -44.161343771946399,171.039864816155216 -44.160747704552463,171.02722374613748 -44.172678591188038,171.003738861770557 -44.172270471483905,171.005543466451428 -44.158009582896362,171.044311836751405 -44.116279021172488)) Author last name Last name of the Author Hitching Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Landis, C.A. Abstract The Abstract for this thesis Argillitic metasiltstone, metagreywacke, conglomerate, chert, metavolcanics and marble comprise the Torlesse rocks at Kakahu. These rocks are situated forty kilometres north west of Timaru, cover an outcrop area of twenty five square kilometres, are overlain unconformably by Tertiary sediments to the south and east, and are separated from Tertiary rocks to the north and west by the Rapuwai fault. Metasiltstone and metagreywacke comprise approximately 60% and 30% of the Torlesse rocks of Kakahu respectively. These rocks belong to textural zone 2B, except for those on the far west of the field area, which are 2A. Pumpellyite is abundant in all metasiltstones and metagreywackes. Prehnite is common in the 2A rocks but occurs only spasmodically in those of textural grade 2B. Point counting indicates that the Kakahu metagreywackes are quartzofeldspathic and are broadly typical of Torlesse metagreywackes. The only sedimentary structure seen in these rocks is laminated, often graded, bedding. Conglomerate is uncommon and was found at only three localities. Pebbles are predominantly well rounded intrabasinal Torlesse-type siltstones, but rare chert, granophyre, and rhyolite pebbles were also found. Fourteen occurrences of chert are recorded, and these may be subdivided as follows: i) Bedded, coloured cherts up to 160 m thick. These cherts are bedded on a scale of 2- 50 cm, and grading and alternations with thin laminae of chloritic slate occur at several localities. These features suggest that these cherts are probably siliceous turbidites. A relict radiolarian texture is observed in some thin sections. ii) Non bedded, grey or yellow grey cherts from l m to approximately 20 m in thickness. iii) Red and pink cherts intercalated with hematitic metavolcanics and white marble in the lower Kakahu River gorge. Two lithologies of intercalated metavolcanics and marble crop out in the lower Kakahu River gorge. The westernmost lithology is a 140 m thick sequence of sixteen bedded units of tuffaceous greenschist, grey marble and metasiltstone. The second lithology which lies directly to the east of the former is 90.m thickness of intercalated poorly schistose hematitic metavolcanics·and pure white marble. In places the white marble is present as irregular lensoidal masses within the metavolcanics - these were probably originally masses of calcareous sediment which infiltrated into primary voids between submarine pillows. The Kakahu Marble is a 30 m thick, pure grey marble which has yielded a fauna of Pennsylvanian conodonts. Conodonts of the same age have also been obtained from the grey marble which is interbedded with tuffaceous greenschist and metasiltstone in the lower Kakahu River gorge. No other identifiable fossils were found in the Torlesse rocks of Kakahu. Three phases of folding are recognised. F1 folds are tight mesoscopic folds which are preserved only in the bedded cherts and interbedded metavolcanic and marble rocks. Macroscopic F2 folding was accompanied by the formation of the regional schistosity (S 2). S2 was macroscopically folded during F3 deformation. The resistant marker lithologies (i.e. cherts, intercalated metavolcanics and marbles, the Kakahu Marble) are traceable along strike for up to 500 m; their boundaries appear to have been tectonically sheared off. Evidence of transposition and shearing is ubiquitous in the metasiltstones and metagreywackes, and the rocks comprise a tectonic melange in the sense of Cowan (1974). Some marker lithologies have boundaries with metasiltstone that are parallel to sand laminae observed in the metasiltstone. As the only two fossil localities at Kakahu, which are 1 kilometre apart, are Pennsylvanian in age, and as one of these fossil localities is interbedded with typical Kakahu metasiltstone, it is likely that all the Torlesse rocks of Kakahu are likewise of Pennsylvanian age. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Kakahu Thesis description Number of pages, maps, CDs, etc. 93 leaves : illus. (part. col.) map (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 1977Hitching Creator An entity primarily responsible for making the resource Hitching, Keith David. 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 Torlesse geology of Kakahu, South Canterbury, New Zealand. Subject The topic of the resource Map Sedimentary petrology Structural geology chert marble Rapuwai Fault Torlesse Supergroup https://theses.otagogeology.org.nz/files/original/9b849cc8e009331869325a2d57c6dc7a.pdf 40d0bdbe4b9c69e73feea2e419ee6db2 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 ((170.188408172110627 -46.053471126147116,170.211224774378337 -46.055459410881326,170.213191938413445 -46.084322600848004,170.209514818354336 -46.109713914512632,170.191020076296269 -46.150220670148563,170.144117716737156 -46.189160250394401,170.087512766991637 -46.209163460003133,170.075888375549596 -46.19553069616822,170.136481771809571 -46.151343063713625,170.173886612152529 -46.116791800585304,170.18570949240285 -46.086363526347618,170.187455077563243 -46.065497665836297,170.188408172110627 -46.053471126147116)) Author last name Last name of the Author Bejnar Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Norris, R.J. Abstract The Abstract for this thesis The southern most coastal exposure of Tuapeka Group rocks is in the Bull Creek area, south of Milton, south Otago. Four mapping units were separated because of sedimentological or structural differences. Massive homogeneous sandstones and siltstones are (from four point counted thin sections) dacitic feldspathic psammites. Related rocks include thick bedded sandstones, rhythmicly bedded siltstones and argillites with fossil worms, colour banded argillites and bedded radiolarian cherts. Black chert nodules from one area were studied geochemically. 2000 ppm tungsten and about 500 ppm native silver occur in these iron and manganese rich radiolarian chert cobbles. The rocks are metamorphosed to upper prehnite - pumpellyite to lowest pumpellyite - actinolite facies; they belong to textural zones 1 and 2A (after Bishop, l972A). Despite the low degree of metamorphism, the rocks are often structurally complex. Six phases of deformation have been identified. 1) Extensive soft sediment deformation caused sedimentary melange in some isolated areas. 2) Isoclinal folding and shearing disrupted the area. Because of the double deformation of the sedimentary melange areas, granules to blocks of the various lithologies are strewn around in an argillite matrix. This is mapped as a broken formation. 3) A deformation overturned the sequence. 4) Normal faulting occurred. 5) Low angle shear zones with well developed long quartz fibers formed. 6) The area was crossed by joints and veins. The placement of what is here labelled 3 and 5 are not definite; they each may have occurred one earlier. The principal quadratic extensions determined from deformed radiolaria are 1.34, 1.10 and 0.68. Most of the elongation probably occurred during phase 2. The geologic history and possible plate tectonic associations are discussed. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Bull Creek Thesis description Number of pages, maps, CDs, etc. 91 leaves : illus. map (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 1977Bejnar Creator An entity primarily responsible for making the resource Bejnar, Tor John Stark. 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 Geology of the Tuapeka group, Bull creek area, South Otago, New Zealand. Subject The topic of the resource Map Geochemistry Metamorphic petrology Structural geology chert textural zone Tuapeka Group