1 10 4 https://theses.otagogeology.org.nz/files/original/2111233fa9f549b529dd927cbd9763b8.pdf b3d6cba15c6fa7ae23acaf0f4c0583e1 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 ((161.46507451643123 -77.331273019660856,161.460541522966793 -77.33123905066229,161.460903549280147 -77.329408106099265,161.471466761285456 -77.275754062448669,161.473206765590618 -77.266872998130182,161.473392507014751 -77.265924242995922,161.474571078136165 -77.259900928127834,161.476017507504594 -77.252500989016866,161.476173634677593 -77.25170173486012,161.476478226815431 -77.250142166825654,161.492741295048262 -77.16632241842396,161.495830984262625 -77.150275212595119,161.496919914414121 -77.144610101570805,161.531617887384328 -77.144701759304041,161.785864724257181 -77.145233770248922,161.852898157062555 -77.145333114478845,161.861725627985265 -77.145344924201581,161.893777970922315 -77.145385316396101,162.210130898240493 -77.145574576781158,162.207232736645665 -77.166639918258241,162.199097435402138 -77.225409578029229,162.195665568492416 -77.250042694622749,162.195445314987325 -77.251620424558539,162.194324948730781 -77.259639929549436,162.193353510325267 -77.26658537468964,162.192176778855554 -77.274988604344728,162.183631857797337 -77.335682912861046,162.163713837288441 -77.335586763632421,162.147505534116618 -77.33550742522749,161.850469571180497 -77.333879045175706,161.502433354950455 -77.331550036902826,161.500857815582634 -77.331538459743967,161.499999994221213 -77.331532152553919,161.46507451643123 -77.331273019660856)) Author last name Last name of the Author Waters Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Craw, D. Abstract The Abstract for this thesis The Swinford and Harker granite plutons crop out on the eastern side of the St Johns Range and intrude all other lithology's except for scattered mafic dykes and aplite dykes. The Harker Pluton truncates and has cooled against the Swinford Pluton and both were passively emplaced at around 1 Okm depth in the crust. Major element, trace element and Rb-Sr isotopes indicate that the two plutons have evolved by differentiation from a common magma. The Swinford Pluton ranges from 64.31 to 72.33 wt% Si02 and its evolution was dominated by fractional crystallisation of predominantly plagioclase. The Barker Pluton ranges from 73.45 to 76.98 wt% Si02. Up to 76% Si02 the Harker displays 'normal' chemical trends and has evolved by similar processes to the Swinford Pluton. Beyond 76% Si02 chemical trends are 'anomalous' with massive enrichment's in Nb, Y, Ga, Rb, Pb and Th, indicative of evolution by thermogravitational diffusion (TGD) processes. Evolution of the two plutons probably occurred within a single parent chamber within which TGD processes established a quasi-stagnant 'enriched' cap. The rest of the convecting chamber was dominated by fractional crystallisation. The Swinford Pluton magma was tapped from near the bottom of the chamber while the Barker Pluton magma was tapped from the chambers middle and top regions. Microgranitoid enclaves and spatially and temporally associated primitive dykes indicate that melting was initiated by intrusion and ponding of mantle derived basic magmas in the lower crust. Enclaves within the plutons represent incorporated globules of the progressively differentiated basic magma. Major and trace element data, mineral chemistry and petrography indicate that these enclaves have undergone hybridisation within the host granites by mechanical mixing and interdiffusional chemical exchange. Granitoids in the Dry Valleys region have been subdivided into DV la, DVlb and DV2 suites (Alii bone et al. in press) on the basis of field relationships and chemistry. The Swinford and Barker plutons belong in the DV2 suite. A review of dating carried out in the Dry Valleys area seems to iildicate that DVla plutons did not close with respect to the Rb-Sr sytem until emplacement of the main DVlb plutons at around 490 My implying that uplift in the area began at around this time. Rb-Sr dating indicates that emplacement of the Swinford and Barker plutons occurred at around 480My. Textural variations indicate that uplift has occurred between the emplacement of the two plutons, implying that orogenic processes were still active. The Swinford and Barker plutons are thought to have been emplaced in a locally extensional environment in an overall transpressional tectonic regime during the late stages of the CambroOrdovician Ross Orogeny. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Southern Victoria Land Antarctica Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : col. 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 1993Waters Creator An entity primarily responsible for making the resource Waters, Alex Sean. Date A point or period of time associated with an event in the lifecycle of the resource 1993 Title A name given to the resource Swinford and Harker plutons : a study in late-orogenic magmatism, Southern Victoria Land, Antarctica Subject The topic of the resource Igneous petrology Antarctica Beacon Supergroup Ferrar Dolerite Harker Pluton Koettlitz Group moraines St Johns Pluton Swinford Pluton Wheeler Pluton Willis Pluton https://theses.otagogeology.org.nz/files/original/71208bc0310b227f96dbb18697ffd19c.pdf e6766a293fba58c239abd697a6317a21 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 ((162.236355465100303 -77.389859723254332,162.233596310016111 -77.403569017447012,162.07408138624541 -77.401749250029923,162.064932970083902 -77.401641993465603,161.849613787253162 -77.399027015907166,161.846063066913047 -77.398982436871208,161.823436446953082 -77.395691450775587,161.784196244097728 -77.389975515225075,161.517196595181161 -77.350793688899387,161.504657408667128 -77.348941119564998,161.502157098688485 -77.348571583423052,161.501170653687979 -77.348425778330849,161.499999989179855 -77.348252735286678,161.204375852785603 -77.304239876585584,161.216697809266066 -77.265216558351895,161.217234606263474 -77.263511155868983,161.218489316643087 -77.259523173261087,161.220745911929953 -77.252344581113078,161.221437654525602 -77.250142441083938,161.229345269601026 -77.224915264997364,161.237360581246037 -77.199243729152471,161.240303506599815 -77.189792507533326,161.247765097254216 -77.165767684487278,161.248523629232494 -77.163320379198097,161.266074372938618 -77.10643675096118,161.79360573855098 -77.112400458546105,161.827244218157318 -77.112744608078643,161.853307492032059 -77.113008280767701,162.290059153390871 -77.117040388022616,162.280478016676426 -77.166563024078897,162.264156220963883 -77.250067628291717,162.263887193999636 -77.251435027833551,162.262296466934174 -77.259514442992511,162.260910175290576 -77.266547269095,162.259114665047775 -77.275644742820262,162.258536454401309 -77.278571679369762,162.243907504953398 -77.352185315772331,162.239349630666993 -77.374949417248089,162.236355465100303 -77.389859723254332)) Author last name Last name of the Author Cook Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Abstract The Abstract for this thesis Baement rocks forming the subject of this report include a range of variably deformed granitoid mafic plutonic bodies and the Koettlitz Group into which they intrude. Deformation, and intrusion were part of the Cambrian-Ordovician Ross Orogen . . The Precam brian Koettlitz Group is the oldest group of rocks in The Dry Valleys area. The Koettlitz Group can be divided in to two northwest trending belts, one dominated by marble, the other lacking marble and containing considerable amounts of intercalated orthogneiss. Quartzofeldspathic rocks are present in minor amounts, the sequence being dominated by amphibole, diopside and biotite rich lithologies. The exact origin of this group is unknown although it appears to represent a highly altered meta-sedimentary and meta-basite sequence. These rocks were subjected to intense deformation and accompanying pluton intrusion which resulted in inhomogeneous distribution of strain and widespread chemical change on regional and local scales. Deformation was continuous during amphibolite facies metamorphism and is described here in terms of three 'generations', characterised in the Koettlitz Group primarily by folding. The first generation was pervasive and resulted in extensive transposition and destruction of all original structures. The second generation consists of locally developed, open to tight folds and associated structures deforming those of the first generation. The third generation consists of large scale warping. High strain zones initiated during local and regional deformation preserve evidence for strain induced metamorphism, element mobility and chemical exchange between dissimilar lithologies on the scale of tens of metres. In these high strain zones, deformation of gabbroic material induced the metamorphic reaction hornblende -> biotite + quartz and promoted element exchange between meta-gabbro and the neighbouring Koettlitz Group and granitoids. On a regional scale, calc-silicates within the Koettlitz Group have illustrated the intimate association between deformation, metamorphism and metasomatism and the effects of rheological contrast on strain partitioning. Deformation and associated metamorphism and element mobility resulted in extensive chemical alteration and transposition of the original Koettlitz Group lithologies on a regional scale, producing a tectonostratigraphy bearing little resemblance to the original structure and chemistry. This widespread element mobility and metamorphism is suggested as an alternative explanation for the observed Koettlitz Group chemistry and mineralogy which is typically interpreted as representing isochemical metamorphism. On a local scale the structural response of the Koettlitz Group to deformation was governed to some extent by rock rheology with incompetent marble and schist horizons tending to flow to areas of lower strain. In response to regional stress, an extensive NW-SE oriented shear zone was initiated and was active throughout deformation governing the location of syntectonic pluton intrusion. Orbicules within syntectonic plutons have indicated that partially molten magma transmits and responds to deviatoric stress by a variety of strain mechanisms including rigid body rotation, magmatic strain solution and fracture. Orbicules also indicate that the strain developed is dependant on the nature and extent of contiguity existing within the pluton and may be influenced by the regional stress rather than stresses arising solely from the inherent motion of the magma. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. South Victoria Land Antarctica Thesis description Number of pages, maps, CDs, etc. 207 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/. Identifier An unambiguous reference to the resource within a given context 1993Cook Creator An entity primarily responsible for making the resource Cook, Yvonne Anne, 1967- Date A point or period of time associated with an event in the lifecycle of the resource 1993 Title A name given to the resource Physical and chemical processes associated with deformation, South Victoria Land, Antarctica Subject The topic of the resource Structural geology Antarctica Ferrar Dolerite Harker Pluton Koettlitz Group moraines south St Johns Pluton St Johns Range Swinford Pluton Victoria Land Wheeler Pluton Willis Pluton https://theses.otagogeology.org.nz/files/original/4614d78bdfc1d1c1537255a860e7f2cd.pdf d5cbed8c18e1df698409b8d35ded9f54 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 ((163.006847174954146 -78.404572032627883,162.982051413573572 -78.404557720472965,162.98233952492788 -78.397511293512721,162.983952569973212 -78.357904087255889,162.984354121707213 -78.348002719622357,162.984944835156881 -78.333406966452543,162.98536607419453 -78.322976593158259,162.889364179438417 -78.322415940447726,162.84904380928316 -78.322170952850271,162.850988769088246 -78.297276566561607,162.851145836949769 -78.295261616360989,162.851240508814556 -78.294046797025217,162.851805449005326 -78.28679231123138,162.855620567120127 -78.237568745853736,162.928951836155562 -78.237863467758473,162.955989730220921 -78.237967406980673,163.007137194901873 -78.238157062816896,163.14972704081319 -78.238637673906027,163.289129795634267 -78.239039087695318,163.379228013628563 -78.239262525969806,163.378953558654871 -78.244129495695148,163.378753164631689 -78.247680613467878,163.378421113779922 -78.253560190982299,163.37622942791873 -78.292222938413133,163.375933712132223 -78.297420365358164,163.374706095760786 -78.318947998914666,163.373929128411191 -78.33253271315283,163.37196693003628 -78.366702039588873,163.371728643716807 -78.370838082023212,163.371622000529442 -78.372688173995002,163.370124389125408 -78.398608533285611,163.370065094954612 -78.399632434887238,163.36978075780732 -78.404539991434376,163.365411372372535 -78.404543066010703,163.234862203208053 -78.404604703420333,163.234332507356811 -78.404604834772812,163.212041025366744 -78.404609470597634,163.164897667749358 -78.404613657569556,163.160364049160336 -78.404613658131993,163.07845269033831 -78.404601515448746,163.006847174954146 -78.404572032627883)) Author last name Last name of the Author Walcott Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Abstract The Abstract for this thesis Dromedary Massif of Southern Victoria Land, Antarctica is an anomalously complex area situated at the southern margin of the regionally simple, Bonney Pluton dominated, structure of the Dry Valleys area. A detailed structural study of Dromedary Massif has highlight the importance of lithological effects deformation under amphibolite facies conditions. Dromedary Massif basement rocks are dominated by metasediment in which three mappable units are identified: Psammitic unit, Interlayered unit and Marble unit. The nomenclature is based on lithological content rather than the previous nomenclature which infers the presence of primary sedimentary structures. Metasediment was intruded first by a series of mafic plutons, Dromedary gabbro, Renegar diorite, Glee hybrid intrusives, and nepheline syenite. Felsic plutons intruded later (Camp One foliated-granite, Penny Hill foliated-grained, Gloomy Hill foliated-granite). All the major lithological groups have been subjected to upper amphibolite fades metamorphism. Numerous granitic dikes intruded the massif at all stages of its structural history and have also been subjected to varying degrees of deformation. Three phases of deformation are recognizable in metasediment using structural elements such as the overprinting of lineations and foliation. The first phase produced a pervasive foliation in the metasediments. The Dromedary Massif is dominated by phase two structures the onset of which second phase is marked by intrusion of mafic plutons during a phase of regional flattening. This was followed by intrusion of a suite of felsic plutons. During regional deformation, metasediment behaved as an incompetent material flowing around relatively competent igneous plutons to produce complex macroscopic and mesoscopic structure. Dromedary Basement structure was further complicated later by intrusion of the Bonney pluton to the north. Flow between two closely spaced plutons on the eastern side of the massif during the same phase as the Bonney pluton intrusion resulted developement of an 8km long by lkm wide NW-SE trending high strain zone. Strain in Dromedary gabbro was locally accommodated along granite dike horizons and produced a spectacularly and complexly deformed granite-dike mylonite. The third deformation phase is recorded by localised crenulation development. Two late-stage major northeast trending faults cross-cut the central and western part of the massif respectively. The complex macroscopic structures of Dromedary Massif predate the generally simpler structures of the northern Dry Valleys area which are related to the intrusion of the Bonney pluton. The complex structure is due to macroscopic inhomogeneous flow during regional deformation. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Antarctica Thesis description Number of pages, maps, CDs, etc. 101 p. : 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 1990Walcott Creator An entity primarily responsible for making the resource Walcott, Rachel Clare, 1966- Date A point or period of time associated with an event in the lifecycle of the resource 1990 Title A name given to the resource Role of lithology in the complex structure of Dromedary Massif, Antarctica Subject The topic of the resource Petrology Antarctica Dromedary Gabbro Dromedary Massif Glee Intrusives McMurdo Volcanic Group moraines Renegar Diorite https://theses.otagogeology.org.nz/files/original/dd80a3081f9241f642f2ffd0611b4709.pdf 76dded3c5a6eed73bd3372af8b3791bc 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 ((161.140198681734489 -77.572875649286786,161.009854451009602 -77.572944324146619,161.0107819480545 -77.541082418465479,161.140620595374742 -77.532531865177603,161.227557081259675 -77.526765400058906,161.499999953535365 -77.50847923196477,161.501067023805803 -77.508406967848757,161.504171614635567 -77.508196690037792,161.60280605515814 -77.501493872051384,161.660838131313312 -77.497530109548649,161.726024218027902 -77.4930598925,161.848476207100219 -77.484611533151437,162.062508477212759 -77.469684157590052,162.063997802043673 -77.469579568816911,162.074081373728603 -77.46887118326039,162.084377548820783 -77.46814739114086,162.26009587924662 -77.455721516834672,162.264255861065976 -77.455731944874216,162.351860830122064 -77.455936642417925,162.374921802074596 -77.455985792165592,162.467872594815816 -77.456163894664229,162.470700175773345 -77.456168810072427,162.469108329449512 -77.469397223100543,162.468826667197618 -77.471735003891823,162.46736147911011 -77.483882127883646,162.465594512845314 -77.498500296063241,162.46440863076603 -77.508292278358468,162.462299948051594 -77.525666654646756,162.461804789072545 -77.529739586277003,162.461385859922586 -77.533183442734199,162.372351997999175 -77.539066069847166,162.171214373371384 -77.552228143023513,162.147934365336653 -77.553740163381477,162.074081350078444 -77.558521278690861,162.066544123418396 -77.559007893014581,162.060068776147915 -77.559425754476578,162.059268952847418 -77.559477355711635,161.923288357302766 -77.568209889197064,161.874528297714278 -77.571321719517073,161.847306664406887 -77.571414708671995,161.663929965691977 -77.571970119333329,161.657879850889401 -77.571986336987521,161.500653309684054 -77.572360597282426,161.393177800455732 -77.572564138878207,161.389836829680434 -77.572569785958621,161.208675014568428 -77.572814548662322,161.140198681734489 -77.572875649286786)) Author last name Last name of the Author Cox Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Craw, D. Abstract The Abstract for this thesis The Lower Paleozoic 'Bonney Pluton' is a coarse-grained, variably megacrystic, monzodioritegranite body which crops out in the Wright Valley, southern Victoria Land, Antarctica. It contains the assemblage quartz- plagioclase (An20-40)- K-feldspar- hornblende- biotite +/- clinopyroxene, with accessory phases titanite, magnetite, ilmenite, zircon, allanite and apatite. Although this calc-alkaline pluton contains numerous northwest-southeast striking mesoscopic compositional variations, the body is unzoned at a macroscopic scale. Two end-member fabrics are developed in the Bonney Pluton: 'pre-full crystallisation fabric' is characteristic of the central granitoid; while at the margins of the pluton 'crystal plastic strain fabric' variably overprints pre-full crystallisation textures parallel to the pluton/host rock contacts. Quantitative strain analysis suggests X/Z ~ 1.5 for crystal plastic strain. Crystal alignments are either S fabric (planar) or L fabric (linear). Foliation of the pluton generally strikes northwest-southeast. Lineation, due to both crystal plastic strain and pre-full crystallisation magmatic flow, is parallel in the eastern margin of the pluton plunging 20° to the northwest. Prefull crystallisation 'flow' towards the northwest occurred in the eastern margin, parallel to the pluton/host rock contact. The Bonney Pluton intruded Koettlitz Group metasediments and interlayered orthogneisses. Three phases of deformation, which were accompanied by amphibolite facies metamorphism, are recognised in Koettlitz Group rocks. The first two phases were syn-migmatitic. Fe-Mg garnet-biotite geothermometry suggests a peak metamorphic temperature of 680°± 40°C. Intense folding and transposition during the first phase of deformation (D1) resulted in a pervasive foliation parallel to lithologic layering. During the second phase of deformation, D1 structures were folded both macroscopically and mesoscopically, and subjected to continued deformation. Macroscopic F2 folds vary in tightness, and axes vary in plunge by 40° within a plane striking 135°. Maximum D2 extension directions, deduced from the apparent rotation of linear features, differ significantly in the host rocks either side of the Bonney Pluton. East of the pluton, extension occurred about an axis of 320/40° with compression about an axis of 050/0°. West of the pluton, extension occurred about an axis of 300/40° with compression about an axis of 090/50°. Three orthogneiss lithologies are present in a variety of structural positions suggesting intrusion into the Koettlitz Group prior, during, and after D2. Orthogneisses can be difficult to distinguish from paragneisses of the Koettlitz Group, particularly where both have been intensely migmatised and deformed, but a number of textural and chemical features indicate a plutonic origin. Orthogneisses typically contain significantly less normative quartz than quartzofeldspathic paragneiss, and have higher Sr values (>325ppm) and have lower Cr and Ni contents than Koettlitz Group rocks containing the same amount of Si02. On the basis of hand-specimen characteristics and geochemistry, hornblende+biotite orthogneisses are indistinguishable from the granitoid of the Bonney Pluton. Although they are in different structural positions, the two granitoids are considered to represent a single continuum of intrusion. Ballooning of the 'proto-pluton' resulted in intrusion-related flattening perpendicular to the margins of the Bonney Pluton. In response to flattening, macroscopic D2 structures were developed in the host rocks (metasediments and precursor 'orthogneiss' intrusions), crystal plastic strain fabrics in the pluton margins; and pre-full crystallisation fabrics in the more central granitoid. Late-stage D3 structures developed along tectonically reactivated pluton/host rock contacts with continued intrusion. Published data suggest the Bonney Pluton crops out over an area greater than 1000km2. The body is elongate with a northwest-southeast trending long axis, parallel to strongly developed stretching lineations and maximum extension directions in the host rocks. Emplacement of the pluton may have been accompanied by a regional deformation event. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Upper Wright Valley Antarctica Thesis description Number of pages, maps, CDs, etc. ix., 185 p., ill., Maps in pocket folded., 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 1989Cox Creator An entity primarily responsible for making the resource Cox, SC Date A point or period of time associated with an event in the lifecycle of the resource 1989 Title A name given to the resource Gneiss Geology: A structural perspective of foliated granitoids and their host rocks in the Wright Valley, South Victoria Land, Antarctica. Subject The topic of the resource Metamorphic petrology Igneous petrology Antarctica Beacon Supergroup Ferrar Dolerite Koettlitz Group Metasediments McMurdo Volcanics moraines Wright Valley