1 10 9 https://theses.otagogeology.org.nz/files/original/d59c9ec78c5480a1931d6b49b0419893.pdf 7af170bed3d708823dbf9881e88d908c 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 ((166.504243443131173 -78.304870235822406,166.118671614482025 -78.307956731074682,166.11338772136034 -78.250217432958465,166.49553126832916 -78.247161801360178,166.504243443131173 -78.304870235822406)) Author last name Last name of the Author Timms Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Wilson, G.S Abstract The Abstract for this thesis Conflicting reconstructions exist for Last Glacial Maximum (LGM) ice configurations in McMurdo Sound, yet climatic modelling studies such as the landmark CLIMAP11 investigation, are critically reliant on ice sheet reconstructions in this region. In more recent reconstructions, there is disagreement over grounding line position, ice flow directions, ice surface contours and chronology of ice sheet retreat. The most significant divergence occurs in the region surrounding southern Black Island, which in turn hosts a significant glacial and geological cover that has been little studied. Fifteen days were spent mapping striated basement, geomorphic features, sediment/ erratic distribution and collecting samples on four diamict-covered, bedrock promontories at the southern end of Black Island. Petrographic, petrological and geochemical analyses were carried out on erratic and bedrock samples. Grain size analyses were undertaken to better characterise the diamict cover. Two new units, Cape Beck Phonolite (Cbp) and Cold Bluffs Tephriphonolite (Cbt), belong to the Erebus volcanic lineage and are the most evolved units of the Black Island volcanic complex. An 40Ar/39Ar age range of 1.8–1.7 Ma was obtained from Cbp lava flows, providing a maximum age constraint for deposition of glacial material. Mapped geomorphic features are a product of both glacial erosion and periglacial weathering processes, with the latter predominant during recent times. Several newly defined glacial facies are defined by two drift units. Cape Beck Drift is not a correlative of the Ross Sea Drift (RSD), and is believed to be a more antiquated Quaternary deposit. Younger drift is considered to be the Last Glacial Maximum response to ice fluctuations in Southern McMurdo Sound (SMS). Drift composition and distribution and glacial striae on Cbp indicate an ice sheet was grounded in SMS when the Cape Beck Drift was deposited. Granite erratics and glacially polished bedrock, proxies for ice elevation, mark the minimum height of the ice sheet at 590 m a.s.l., indicating that it completely overrtopped southern Black Island. The glacial reconstruction presented in this study was constrained by the orientations of 150, previously unrecorded, glacial striae and the distribution of key erratics in the Cape Beck Drift, which support northerly trending ice flow of the main lobe of the SMS ice sheet. This flow direction is antipodal to those presented by the CLIMAP reconstruction and its derivatives. The discrepancies between RSD reconstructions and the reconstruction of this study, highlight the need to re-assess the glacial deposits in the McMurdo Sound region that have been ascribed a LGM age, and are assumed to be related to most extensive configuration of the Antarctic Ice Sheet. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. McMurdo Sound Antarctica Thesis description Number of pages, maps, CDs, etc. xiv, 150 p. : ill., maps ; 30 cm. + 1 CD-ROM (4 3/4 in.) and 3 maps. 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 2006Timms Creator An entity primarily responsible for making the resource Timms, Carolyn Jean. Date A point or period of time associated with an event in the lifecycle of the resource 2006 Title A name given to the resource Reconstruction of a grounded ice sheet in McMurdo Sound : evidence from Southern Black Island, Antarctica Subject The topic of the resource Geomorphology ice sheets https://theses.otagogeology.org.nz/files/original/c4c9f440f67eef198d9cc7acd37a27d1.pdf 82dc5189b31f5ee0a9ee3f0b2ad03b92 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 ((168.286005602953594 -44.730015501152728,168.302611567129986 -44.846456452374163,168.244045625606162 -44.850219675465723,168.223635617541731 -44.829835281733494,168.232816200232577 -44.799732856501393,168.233279745973732 -44.745447329528119,168.286005602953594 -44.730015501152728)) Author last name Last name of the Author Popham 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 Pounamu/greenstone is Aotearoa/New Zealand's icon mineral, a taonga (treasure) of which Ngai Tahu are kaitiaki (guardians). Pounamu in the form of nephrite and semi-nephrite occurs in Scott Basin, Lake Wakatipu, West Otago, New Zealand. It formed within the Greenstone Melange at contacts between tectonic inclusions ("knockers") of metasediment or metavolcanic rock and sheared serpentinite matrix, and was subsequently liberated, concentrated and transported by erosion. Most (90 %) pounamu formed in discontinuous reaction zones typically comprising metasediment - nephrite - semi-nephrite - talcose semi-nephrite - talc magnesite - serpentinite. Approximately 80 % of in situ pounamu occurrences are within 150 m of the Caples - Greenstone Melange contact. X-ray diffraction and electron microprobe analyses indicate Scott Basin pounamu is predominantly monomineralic, comprised of Mg-rich actinolite. A three-dimensional felted fabric, developed through shearing, gives the rock its hardness and toughness. High quality nephrite is hard (6- 6.5 on the Mohs scale), and is typified by un-oriented, interwoven, short fibres of actinolite. Poor quality semi-nephrite is softer (< 6 on the Mohs scale), and is typified by long, elongate fibres in the plane of the dominant foliation, with interstitial talc. Relict hornblende within pounamu has similar composition to hornblende in the nearby Dun Mountain Ophiolite Belt, and a similar provenance is inferred. Geochemical analyses (22) of Scott Basin pounamu and associated metasomatic rocks were compared with nephrite and serpentinite samples from Westland, Canada and Australia. Major and minor elements do not discriminate these geographic occurrences and geological environments. Chromium can be used to locate tl1e position of original protolith boundaries within metasomatic zones. Scott Basin nephrite commonly has Cr concentrations < 1000 ppm that indicate nephrite formation has migrated inwards (towards the Cr-poor metasediment protolith) during progressive metasomatism. Streambed surveys quantified transported alluvial pounamu with progressive distance downstream from Greenstone Melange source rocks. Five techniques were developed and trialled: transect analysis; image area analysis; image point counting; fixed area survey; and fines analysis. Fixed area surveying is recommended for future work. Survey data indicate pounamu: develops Jag deposits above and near melange source rocks at 1 - 11 % of streambed material; decreases to 1 - 7 % immediately downstream; and is further diluted to < 1% at >3 km distance from the source rocks. Resource assessment calculations show that pounamu occurs at concentrations of 100 - 200 t/km2 in situ; 10,000 - 100,000 t/km2 near situ; and transported alluvial pounamu occurs at 2,000 - 16,000 t/km2 in the upper reaches of Scott Creek, and is diluted to approximately 30 - 300 tjkm2 in the lower reaches. The best estimate of Scott Basin pounamu is 870 t of in situ resource, 4,080 t of near situ resource, and 1,560 t of transported alluvial resource. The total resource of 6,500 t (best estimate) lies within an uncertainty range of 790- 9,600 t. The resource is expected to change with time, however, due to ongoing uplift and erosion. Controlling extraction to < 10 tonnes/year for pounamu, or less for high-quality nephritic material, should enable long-term sustainability. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3989">http://hdl.handle.net/10523/3989</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. Wakatipu Scott Basin Wakatipu Lake Wakatipu Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : ill. ; 30 cm. + 2 maps, folded. 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 2006Popham Creator An entity primarily responsible for making the resource Popham, T. B. (Timothy Bruce) Date A point or period of time associated with an event in the lifecycle of the resource 2006 Title A name given to the resource Pounamu : characterisation and resource assessment; Scott Basin, Wakatipu, New Zealand Subject The topic of the resource Mineralogy Map Geomorphology greenstone pounamu https://theses.otagogeology.org.nz/files/original/cf9d95c66fc9abf46c648fea32b25f04.pdf 22d0e578d62f626c2bd8c48c832dc4c7 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 ((170.65608753074946 -77.562057616076615,169.925001679483756 -78.648782917432698,164.13705178231271 -78.408168273440168,165.349204115465511 -77.346396867272929,170.65608753074946 -77.562057616076615)) Author last name Last name of the Author Clifford Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Wilson, G.S. Abstract The Abstract for this thesis global environmental change. Such changes are of particular concern in West Antarctica the world's largest marine ice sheet (the West Antarctic Ice Sheet, WAIS) could cause m global sea level rise, should it collapse. Many studies have, therefore, focused on the largest ice shelves buffering the WAIS from the oceans (the Ross and Ronne-Filchner ice ves). However, an understanding of the dynamics and stability of these large ice shelves is 'ted by their inaccessibility and the complex behaviour of the ice streams and glaciers that them. Conversely, the McMurdo Ice Shelf (MIS) at the north-west edge of the Ross Ice (RIS) has dimensions of only 100 x 50 km and is relatively accessible, making it a good 'ILIV''"'H'"~~ analogue for the glacial processes of the RIS. uH,...,~,J~v5,·,.., data for the northern MIS are abundant and show that this part of the ice shelf is fed by the RIS, the Ross Island glaciers and the Koettlitz Glacier. In contrast, the present glaciologic regime of the southern MIS (SMIS; between the volcanic landmasses of Black Island, Mount Discovery and Minna Bluff) has mainly been inferred from limited spot measurements published over 30 years ago (Swithinbank, 1970). The SMIS is distinctive in that glacial deposits are preserved at its margins and on its surface, providing evidence for former ice shelf and ice sheet activity in southern McMurdo Sound. Consequently, there is potential to evaluate how an ice shelf responds to environmental change, as, on the SMIS, the preserved glacial deposits can be interpreted in terms of active processes that can be readily measured within the confines of a comparatively small area. The major motivation for the present research has been to determine the present glaciologic regime of the SMIS by compiling data-sets relating to its physiography and flow characteristics, with which former inferences can be tested and vulnerability of the ice shelf to climate change can be assessed. Geophysical data (GPS, ground-penetrating radar, seismic, aeromagnetic and gravity surveys) were acquired on the SMIS over three consecutive austral summers (2002/03-2004/05) in conjunction with ANDRILL site investigations. These data have been compiled with morphometric analyses (satellite images, aerial photographs and field observations) to identify: (i) surface accumulation/ablation areas, (ii) ice surface elevation, (iii) ice shelf thickness, (iv) horizontal flow velocities, (v) pinning points/grounding zones (vi) areas of marine ice accretion and, (vii) active sediment transport processes. iii The results show that south-westerly katabatic winds deposit snow and sediment in the surface accumulation area south of Black and White islands, where surface elevation is highest (>-20 m ellipsoid height) and the ice shelf is thickest (190 ± 10 m). Surface elevation and ice thickness decrease towards the south (Minna Bluff) and west (Moraine Strait), where the katabatic winds are strongest, and cause surface ablation. The flow pattern follows the same directional trend, indicating that it is driven by gravitational creep. Flow is regulated by frictional resistance at grounding zones, located at the landmass margins and below a midshelf ice rise, where a seamount intersects the base of the SMIS. The horizontal flow velocities (~2-7 m a-1) are up to two orders of magnitude lower than those observed on the adjacent RIS and northern MIS and there is negligible input from these ice shelves. This indicates that the SMIS is an independent ice shelf characterized by its wind-driven glaciologic regime and thus is not an analogue for the neighbouring RIS. In addition, the SMIS is buffered from potential collapse by the MIS and the surrounding land masses, and, therefore, will not respond to climate change in the same way as the exposed ice shelves that surround the rest of the continent. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. McMurdo Ice shelf southern Antarctica Thesis description Number of pages, maps, CDs, etc. xiii, 238 p. : ill., maps (some fold.) ; 30 cm. + 1 CD-ROM. 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 2005Clifford Creator An entity primarily responsible for making the resource Clifford, Andrew E. (Andrew Eliot) Date A point or period of time associated with an event in the lifecycle of the resource 2005 Title A name given to the resource Physiography, flow characteristics and vulnerability of the Southern McMurdo Ice shelf, Antarctica Subject The topic of the resource Geomorphology ice sheets https://theses.otagogeology.org.nz/files/original/ffd8ab56a13687dc481460a139ec6441.pdf 1695da2a5b70ecb73d9880001fc77641 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 Marx Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student White, J.D.L. Abstract The Abstract for this thesis The Rotorua volcanic centre (RVC) forms a well-defined topographic depression ? 21 km by 22 km in diameter that is located along, and partly delineates, a structural embayment in the western margin of the central TVZ. The late Quaternary lacustrine sedimentary record in the Rotorua depression probably began shortly after Rotorua Caldera formed with the eruption at ? 220 ka, of the voluminous Mamaku Ignimbrite. Initial sedimentation probably began with debris and hyperconcentrated flows, followed by lacustrine deposition as the new catchment adjusted to the volcanically created accommodation space. Three littoral terraces, formed during periods of stable high water levels surround Lake Rotorua. Deposits exposed in these terrace outcrops include those of beaches, subaqueous channels, fine-grained delta fronts and well-formed delta foresets. These can be separated by their geomorphology and field relationships, in particular by identifying the unconformities that separate highstand deposits. Sediment from these deposits was also characterised by Electron Microprobe analysis of glass shards, granulometry, their ferromagnesian mineral assemblage, and XRD and SEM analysis of samples obtained from different lacustrine deposits. This dataset allows construction of an integrated stratigraphic model from individual deposits and outcrops, informally subdividing them into three alloformations based on their bounding unconformities. Allostratigraphy provides an objective means of correlating heterogenous lacustrine deposits that are nevertheless genetically related. Lacustrine beds were deposited in deep lake waters during three time intervals, when Lake Rotorua was filled to between 65 m and 120m higher than today. Each suite of deposits is informally named for the volcanic event inferred to have initiated the high lake level. 1. Post-Mamaku alloformation (up to ? 415 m a.s.l.). 2. Post-Rotoiti alloformation (up to ? 380 m a.s.l.). 3. Post-Hauparu alloformation (up to ? 349 m a.s.l.). The first highstand, after the Rotorua depression formed, may have ended when the caldera wall adjacent to the Pohaturoa Dome collapsed, with this breach forming the Hemo Gorge. Subsequent high stands followed eruptions from the neighbouring Okataina Volcanic Centre that deposited large, northwardly dispersed, tephra deposits which formed natural dams across the Rotoiti channel, the northern outlet of Lake Rotorua. Eventually these dams were breached either by headward stream erosion or by land sliding of weak damming material. This channel was finally occluded at ? 9 ka and now contains Lake Rotoiti. At very high lake levels, the lake may have spilled across the caldera margin above Mission Bay; this water would have entered the Kaituna River, to drain into the Western Bay of Plenty. At this high level, the lake extended through the Hemo Gorge and flooded the neighbouring Kapenga depression, probably crossing the modem drainage divide and spilling into the Waikato River to the South. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5421">http://hdl.handle.net/10523/5421</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. Lake Rotorua Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : ill. ; 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 2004Marx Creator An entity primarily responsible for making the resource Marx, Raymond Stanley. Date A point or period of time associated with an event in the lifecycle of the resource 2004 Title A name given to the resource Evolution of Lake Rotorua Subject The topic of the resource Volcanology Geomorphology lake sediment volcanic ash https://theses.otagogeology.org.nz/files/original/20ddbbd358ec7fea980f65f6585e6ef0.pdf a05d34aae8f58106e1cd5a2a342f000d 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 ((167.679711262052336 -78.121378578449367,167.679693246026687 -78.12286068013735,167.186456692707225 -78.12228951910545,167.190777600579395 -78.099161880598245,167.20049170033775 -78.046841483096202,167.208908879070634 -78.001138088837877,167.209652099689436 -77.997086007567361,167.210371827040632 -77.993159426284649,167.522646671819643 -77.994977870565236,167.679392076314002 -77.995759874008044,167.681222111718881 -77.995768488059127,167.680920555077449 -78.021048326046511,167.680797770689963 -78.031311379951745,167.679894993596633 -78.106241997628814,167.679711262052336 -78.121378578449367)) Author last name Last name of the Author Coulter Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Cooper, A.F. Wilson, G.S. Abstract The Abstract for this thesis White Island is a uniquely basanitoid-basanitic volcano in a chain of Cenozoic volcanic islands that parallel the western edge of the West Antarctic Rift System. Glaciatjon and possibly landsliding has eroded the island which, as shown by magnetic surveys, extends several kilometres further to the north under the ice sheet. Two main vent types were identified, lava-shields and maars, formed during a variety of eruption styles ranging from surtseyan to strombolian. All but one sample was found to be basanite, the other rock, a basanitoid, has more groundmass plagioclase and is less enriched in incompatible trace elements. Both rock types are inferred to have resulted from small amounts of partial melting possibly in the spine! lherzolite stability zone (25-60 km). The basanitoid resulted from slightly higher degrees of partial melting than the basanite, but based on Zr/Nb ratios all samples are cogenetic. Up to 50% crystal fractionation has occurred within the basanite spectra. Based on paleomagnetic dating, the island was found to be at least 0.78 my old, approximately four times the age of the single previous K-Ar date of 0.17 Ma (Kyle 1981). The extended age range is more compatible with lithospheric flexure models in the area whicli imply volcanic loading occurred between 1.4 Ma and 11 Ma (Aitkin 2003), and indicates that the island was active for a minimum of 0.6 my. The island occurs in an area of the West Antarctic Rift System (the Erebus Volcanic Province, Southern Victoria Land) interpreted as being a transtensional accommodation zone. This section of the rift boundary is marked by a change in orientation of the Transantarctic Mountains, and has acted as a tectonically separate block to the rest of Victoria Land for the last 800 my. During that time, the area that is now the Erebus Volcanic Province experienced two main tectonic regimes, the Ross Orogeny and the plume-related West Antarctic Rift System. At both times the area is associated with distinctly alkaline magmatism. Geophysical and modelling data indicate that the crust beneath the Ere bus Volcanic Province is very thin (- 20 km) and that Cenozoic uplift may have been localised in Southern Victoria Land, which may be part of the reason that the volcanics have such an alkali-rich signature. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. White Island Antarctica Antarctica Victoria Land southern Thesis description Number of pages, maps, CDs, etc. xi, 121 leaves : col. ill. ; 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 2004Coulter Creator An entity primarily responsible for making the resource Coulter, Roseanne F. Date A point or period of time associated with an event in the lifecycle of the resource 2004 Title A name given to the resource Geology of northern White Island, Southern Victoria Land, Antarctica Subject The topic of the resource Geomorphology Antarctica Ross Orogeny West Antarctic Rift System. White Island https://theses.otagogeology.org.nz/files/original/3ac028f15e11063bba06e663fc110842.pdf 136f0c665aefec4a4b91b5a9882d8843 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 ((167.959021582402954 -78.133657246351646,167.813813352878668 -78.243964566749312,167.694329938859738 -78.23848297192859,167.114084538619977 -78.211081494710129,166.861651554291001 -78.198753679606199,166.838150260308424 -78.197593346716857,166.859241483882641 -78.179501574902503,166.964281011110501 -78.088556363570348,167.081883068072642 -78.094087867801022,167.190777600579395 -78.099161880598245,167.20590498446208 -78.099863110718772,167.387375763308285 -78.108206101675776,167.679711262052336 -78.121378578449367,167.687068036730153 -78.12170582592708,167.959021582402954 -78.133657246351646)) Author last name Last name of the Author Adam Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student White, J.D.L. Palin, J.M. Craw, D. Read, S. Abstract The Abstract for this thesis White Island is a glaciated volcanic island in the western Ross Embayment of the Ross Ice Shelf, Antarctica. The interests of this research are the extrusive volcanic rocks, shallow intrusive rocks, deep crusta! xenoliths, and pyroclastic deposits that characterise the southern half of White Island. The flow rocks, dykes, and plugs of southern White Island comprise predominant basanite and minor tephriphonolite. The basanites contain phenocrysts of olivine and titanaugite, and variable abundances of kaersutite, aegirine, magnetite, apatite and plagioclase xenocrysts in a fine grained groundmass. The tephriphonolite comprises phenocrysts and xenocrysts of kaersutite and microphenocrysts of aegirine-augite and plagioclase in a sideromelane groundmass. The rocks of the southern White Island suite are related by fractional crystallisation involving the early removal of olivine and titanaugite and late fractionation of magnetite. Trends are comparable to those from alkali basaltic suites of Antarctica, and to geochemical trends of the Dunedin Volcanic Province, New Zealand. Two basanites are not considered to be related by fractional crystallisation, and originate from different degrees of partial melting of the mantle. Lower crusta! xenoliths are found in the aforementioned basanitic flow rocks, and are defined petrographically into three types: Type One xenoliths, which are unmetamorphosed gabbro; Type Two xenoliths, which are partially recrystallised granulites displaying a mortar texture; and Type Three xenoliths, which are fully recrystallised granulites. Features of their whole rock geochemistry indicate these xenoliths originated as cumulates from an evolving alkaline magma. Crusta! xenoliths do not represent cumulates of their host magmas; however, they may originate from alkaline magmas associated with rift-related volcanism of the McMurdo Volcanic Group. Following igneous crystallisation, these rocks were variably recrystallised under granulite facies metamorphic conditions. Secondary fluid inclusions provide evidence of fluxes of C02- rich fluids both preceding and following recrystallisation. This fluid flux may be related to the crystallisation of metasomatic kaersutite and biotite, which is shown by whole rock geochemistry to occur by the infiltration of a volatile-rich fluid rather than an alkaline melt. Mineral chemistry shows the Type One xenolith analysed does not represent the unmetamorphosed protolith of the Type Two and Three xenoliths analysed; however, this does not necessarily preclude such a relationship between other xenoliths. The Type Two and Three xenoliths analysed are related by different degrees of recrystallisation of the same protolith. Lapilli tuffs rich in basanitic accidental fragments comprise two of the peaks in the field area, and were formed during phreatomagmatic eruption, and subsequently transported and deposited by a series of hydroclastic base surges. Subordinate tuff occurs in one location, and is thought to also have originated during phreatomagmatic eruption. Spatter lapillistone comprising several small outcrops was deposited during Hawaiian or Strombolian eruptions, throughout which quenched juvenile ejecta impacted onto a solid substrate to form welded deposits. Ejecta from the centre of eruption columns retained sufficient heat to coalesce upon landing, forming spatter-fed lava flows. Keywords: White Island, Antarctica, basanite, tephriphonolite, fractional crystallisation, lower crustal xenolith, cumulate, lapilli tuff, spatter, phreatomagmatic, base surge. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. White Island Antarctica Antarctica Thesis description Number of pages, maps, CDs, etc. 156 leaves : col. ill., maps (1 folded) ; 30 cm. + 1 folded map in pocket. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2004Adam Creator An entity primarily responsible for making the resource Adam, Lotte J. Date A point or period of time associated with an event in the lifecycle of the resource 2004 Title A name given to the resource Geology of southern White Island, Antarctica Subject The topic of the resource Map Geomorphology Antarctica basinite fractional crystallisation tephriphonolite White Island https://theses.otagogeology.org.nz/files/original/351ab276dfbc8ca6a1c2fe58142ec89b.pdf dbfa30d421ca1446a3f50a1cc19239cf 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 ((159.611075921071176 -76.748316544760868,159.59503935563319 -76.748039960184116,159.5989590931257 -76.734569862430405,159.598978675760151 -76.734502503862643,159.599180922358386 -76.733806741550183,159.602306898959512 -76.72304378433752,159.604374234965746 -76.715916320645661,159.609728851011255 -76.715990491823646,159.669333135702288 -76.716808468619035,159.708671534839027 -76.71734063605183,159.765043185662762 -76.718092571315296,159.763183171099996 -76.725772770284109,159.761360840412294 -76.733288879283279,159.757407528486851 -76.749565288902389,159.75729266893876 -76.750037588018429,159.757110070628499 -76.750788373720212,159.713379693940311 -76.75005702850801,159.665119859742646 -76.74924115017167,159.611075921071176 -76.748316544760868)) Author last name Last name of the Author Lockett Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Abstract The Abstract for this thesis In the Allan Hills, Victoria Land, Antarctica, Beacon Supergroup sedimentary rocks are juxtaposed with volcaniclastic rocks of the Ferrar-age Mawson Formation. The Mawson Formation and its correlatives along the Transantarctic Mountains contain an abundance of rather chaotic rocks consisting of once-glassy, juvenile basaltic grains mixed with broken country rock from the Beacon. Many of these rocks, including those at Allan Hills, have been interpreted in terms of a large vent complex that formed in advance of Kirkpatrick flood-basalt eruptions of the Ferrar large igneous province. New Watters peak, the Mawson Formation at Allan Hills can be divided into two units. One unit ("Mawson A") contains little or no juvenile basaltic material. Mawson B is more typical Mawson Formation tuff breccia, containing a variably high concentration of glassy juvenile material; it forms most of the Allan Hills and much of the nearby Coombs Hills. Mawson B is interpreted to be a intra-vent deposit, within a large shallow vent complex. Mawson A has a sharp to gradational contacts with unit B, and a gradational contact with Beacon Supergroup country rock. There are two main facies within Mawson A. The lower facies (Mawson Al) consists entirely of blocks of medium grained sandstone. Nearest the contact, blocks are of decimeter scale, rotated only slightly or not all, and beds within blocks can be traced from block to block for metres. Thin seams of sand matrix separate the blocks, and the sand consists of the same grains as the sand constituting the sandstone in the blocks. Further from the contact, blocks are commonly rotated and squeezed back together with little or no matrix between them. This unit is interpreted to have formed at the vent margin due to marginal subsidence caused by the removal of fragmented rock from the site of phreatomagmatic eruptions. A second facies (Mawson A2) lies further from the contact with the Beacon Supergroup, is more chaotic in appearance, and comprises predominately medium grained sandstone, but also contains clasts of coarse-medium sand pebbly congmplerate, fine grained sandstone, coal and glassy juvenile material. Clasts are randomly orientated and no internal structures are visible. This unit is interpreted to a debris flow Analysis on coal within this unit suggests that it was sourced from high in the Lashly Formation. The flow travelled into the vent complex implying it had negative relief. The flow was most likely the result of continued volcanic/tectonic seismicity causing failure along incipient weaknesses in the country rock surrounding the vent. After the flow volcanic activity continued and new intra-vent Mawson B was formed which incorporated some of the debris of the flow. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Antarctica Victoria Land south Allan Hills Thesis description Number of pages, maps, CDs, etc. viii, 105 leaves : ill. (some col.), maps (some col., 1 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 2003Lockett Creator An entity primarily responsible for making the resource Lockett, Gillian M. (Gillian Mary) Date A point or period of time associated with an event in the lifecycle of the resource 2003 Title A name given to the resource Landslide and debris flow deposits at the margin of a large vent complex, Mawson Formation, Allan Hills, southern Victoria Land, Antarctica Subject The topic of the resource Geomorphology debris flow deposits landslide Mawson Formation rock debris slopes vent complex https://theses.otagogeology.org.nz/files/original/006ecb959ca117640469abd2e5e2154f.pdf a0810ae20438b609dc86b5a52f3fc3cd 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 ((169.282590345000017 -45.458336478999968,169.282536356000037 -45.459280576999959,169.282524856000123 -45.459460366999963,169.282495305000111 -45.460022411999944,169.282185535000053 -45.460012597999935,169.164147104000108 -45.457202475999964,169.109240897000063 -45.454464881999968,169.105110935000084 -45.454255616999944,169.011116757000082 -45.450921536999942,168.974504028000069 -45.449600961999977,168.968946740000092 -45.449400734999983,168.869013238000093 -45.445731160999969,168.875109721000058 -45.372194341999943,168.875256578000062 -45.370397502999936,168.875328407000097 -45.369521551999981,168.875681772000121 -45.365222683999946,168.876023160000045 -45.356188563999979,168.876358167000035 -45.352461183999935,168.881775157000106 -45.282071228999939,168.881928583000104 -45.280085393999968,168.881962960000124 -45.279600056999982,168.882933856000022 -45.266474934999962,168.894343970000023 -45.266791579999961,168.899412534000021 -45.266974398999935,168.899628908000068 -45.266982005999978,168.906021220000071 -45.267211060999955,169.176069845000029 -45.277499553999974,169.177531469000087 -45.277538365999931,169.29449176300011 -45.280403413999977,169.289546832000042 -45.370875209999951,169.288860097000111 -45.379541502999984,169.282590345000017 -45.458336478999968)) Author last name Last name of the Author Stirling Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A Norris, R.J. Abstract The Abstract for this thesis The late Cenozoic tectonics and geomorphology of a 700 square kilometre area of remnant peneplain topography comprising the Old Man Range, Obelisk Range and Garvie Mountains, Central Otago, have been investigated. This study combined with existing data from Otago show that the peneplain was originally devoid of significant relief (maximum paleorelief = 500m/10km, in west) and is underlain by a broadly low angle schistosity (c. 0-20°). Tertiary sediments in the area indicate that the peneplain surface has been vertically offset by up to c. 1500 metres. Quartzose Potters Gravels (new name) have a palynologically determined Waipipian maximum age, and were reworked from Manuherikia Group sediments during early uplift of the schist ranges. Mapping has revealed a consistently low angle relationship between schistosity and peneplain attitude, and dominance of distributed deformation (flexure) over fault displacement deformation. Undulations in topography are thus mirrored by equivalent undulations in underlying schistosity, and the study area has been divided into nine fault bounded tectonotopographic blocks (new term). Three fault provinces are also recognised. Tabulation of joint orientations shows D (ESE) sets to dominate in the west and C and D (ENE-ESE) sets to dominate in the east. They are geometrically and genetically related to pre-Cenozoic faults (Nevis-Cardrona and Old Man fault systems, the latter of which does not displace the peneplain significantly), and reactivated according to flexure of blocks. Fold axes of blocks trend north-northeast in the west and north-northwest in the east. Heterogeneous strain distribution is evidenced by variable shortening percentages/axes of blocks and contrasts with bordering tectonic basins. Shortening by folding is calculated through measurement of angular spread of poles to topography and schistosity attitudes on stereonets. Shortening values of 3.1% (schistosity-derived) and 3.8% (peneplain-derived) on an axis 081 are calculated for the study area. The axis is similar to geodetic PHS directions and plate convergence vectors for Central Otago (Blick 1986, Walcott 1978). A transpressional en echelon folding model has been developed with the aid of Surface II graphics and Fourier analysis. Regional peneplain and schistosity-derived values of 1% shortening are calculated in the east (Taieri Ridge area), and up to 26% in the west (Cardrona-Moonlight block). Shortening values are similar to those required by the crustal bending model (Norris 1979). Late Cenozoic bending and rotation is evidenced by a c. 10° northward convergence in schist lineation trend (equivalent to Old Man and Nevis fault convergence). Considerable shortening is indicated by steep schistosity attitudes in west Otago/Northern Southland, where the peneplain is not preserved. Schistosity attitude could be used in late Cenozoic strain analysis outside Otago (e.g. Marlborough schists). Landform studies show the upland peneplain to have suffered minimal degradation in the late Cenozoic. Tors have been formed by erosion of a weathered zone of irregular depth (0 to 10 metre depth at the Potters depression), and are thus genetically inseparable from lower altitude tors. They occur where jointing is well developed (i.e. dependant on degree of flexure) and in areas relatively sheltered from the southwest. XRD analysis of clays from the study area and from Quaternary-late Tertiary sediments in the upper Clutha Valley has constrained kaolinite age as pre dating deposition of the Maori Bottom Formation. Additionally, erosion of the peneplain has been limited to removal of the weathered zone. A degradation rate (3-10 mm/1000 y) is calculated, based on known thicknesses of the weathered zone. This degradation rate is similar to rates determined in tectonically inactive cold temperate and arctic environments. Clay and landform studies could be used for identification of the peneplain surface outside Central Otago. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Old Man Range Garvie Mountains Thesis description Number of pages, maps, CDs, etc. xiv. 179 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 1988Stirling Creator An entity primarily responsible for making the resource Stirling, MW Date A point or period of time associated with an event in the lifecycle of the resource 1988 Title A name given to the resource Tectonic Geomorphology of the Old Man Range and Garvie Mountains, Central Otago. Subject The topic of the resource Geomorphology Tectonics Fraser River Garvie Mountains Old Man Range Otago Region tectonics https://theses.otagogeology.org.nz/files/original/fcf40b27cd551248601e8f21c0923a3f.pdf 51c45b559804298365ec045435b4f88c 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 Brewster 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 Five beaches around the Peninsula (Tomahawk, Smails, Allans, and Victory Beaches, and Harwood spit) are examined for evidence of recent accretion and erosion, mainly through the use of aerial photographs. They are essentially stable except for Harwood spit which is presently eroding. Mineralogical and size analyses of the beach and back dune sands are carried out, samples range from 60-85% quartz and are well-sorted. From the stratigraphy at Okia Flat three apparent dune building episodes are recognized, the last two having occurred since the period 800-1500 AD. The cause and origin of a substantial sand blow across the Peninsula at Otakau in the 1860's are looked at. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Dunedin Thesis description Number of pages, maps, CDs, etc. 88 leaves : ill., (some col.); maps ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1980Brewster Creator An entity primarily responsible for making the resource Brewster, Anthony Patrick. Date A point or period of time associated with an event in the lifecycle of the resource 1980 Title A name given to the resource Dunedin dune complexes. Subject The topic of the resource Geomorphology accretion erosion size analyses