2 10 16 https://theses.otagogeology.org.nz/files/original/e3a78ee74b987cea09a2e62f79759fcc.pdf 40da07db4f0dea85b7a47d5e1c8696a1 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 Dagg 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 The Oligocene was a time of major tectonic development in the Southern Ocean. The final break-up of Gondwana was underway leading to the opening of the Drake Passage and Tasman Gateway allowing the development of the Antarctic Circumpolar Current. During the mid-Oligocene much of New Zealand was submerged and it was during this period the Marshall Paraconformity, a regional unconformity on the eastern margin of the South Island, was formed. The development of the Marshall Paraconformity is attributed to a number of causes including eustatic sea level fall, sub-aerial erosion, and/or a marine transgression cutting off sediment supply. In 2005, a 270 m long sedimentary core (TNW-1) passing through the Marshall Paraconformity was retrieved from the Tengawai River at the southern end of the Canterbury Basin. To determine the cause of the Marshall Paraconformity this thesis investigates the TNW-1 core between the depths of 170 m and 185 m, an interval which contains the Marshall Paraconformity (at 182.91m). After retrieval, the core was split, a detailed visual log made of the significant features and discrete samples taken at approximately 300 mm intervals. The discrete samples were subjected to non-destructive rock magnetic analysis including IRM, ARM, AMS and magnetic susceptibility. Following the rock magnetic analysis the samples were used to make polished sections for point counts, petrographic and microprobe analysis. The remaining sample was then chemically treated to remove the carbonate, oxides and opal and then used for grain size analysis. High-resolution magnetic susceptibility of the core was collected with the point count sensor on a Geotek MSCL. The core was divided into 4 lithostratigraphic subunits (LSU), three above and one below the paraconformity. The dominant mineral in the LSU above the paraconformity is dark green glaucony (DGG) with a light green glaucony (LGG) making up the remainder. The two types of glaucony are geochemically and petrographically distinct. Only DGG is present below the paraconformity and this cannot be geochemically distinguished from the DGG above the paraconformity. The LGG and DGG both exhibit a degree of fragmentation and many of the DGG are oxidised indicating the glaucony is allochthonous. Variation in the grain size distribution of the subunits was attributed to the development and waxing and waning of a marine current. The magnetic susceptibility of the interval responds to the variations in the percentage of glaucony in the sediment. Fourier and wavelet analyses of the interval show the presence of an orbital signal in the magnetic susceptibility above the paraconformity. The development of the paraconformity and the subsequent deposition of the overlying sediment with its orbital signal are attributed to the Tasman Current (TC) passing over the core location. The Marshall Paraconformity (MP) formed due to the TC flowing over the mostly submerged New Zealand landmass preventing the deposition of sediment between approximately 37.9 Ma and 25.8 Ma. The opening of the Drake Passage at approximately 25.2 Ma initiated development of the Antarctic Circumpolar Current (ACC). As the ACC strengthened the TC began to weaken, allowing deposition of the Kokoamu Greensand and Otekaike Limestone above the MP between 25.8 Ma and 25.2 Ma in the TNW-1 core in South Canterbury. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/1634">http://hdl.handle.net/10523/1634</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Tengawai River South Canterbury Thesis description Number of pages, maps, CDs, etc. xxii, 240 p. : ill. (some col.), col. maps ; 30 cm. + 1 CD-ROM 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 2010Dagg Creator An entity primarily responsible for making the resource Dagg, Robert John Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Greensand at the Marshall Paraconformity Subject The topic of the resource Lithostratigraphy Glaucony Marshall paraconformity https://theses.otagogeology.org.nz/files/original/14fb041cc88da757209130c800306e78.pdf b9c67db33855a34db7352f9714252c58 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 ((169.329013117695297 -43.990804332721176,169.331935745807328 -43.959455718248279,169.399485419125511 -43.963036249729043,169.394773372522934 -43.991829032385262,169.329013117695297 -43.990804332721176)) Author last name Last name of the Author Collins Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Cooper, A.F. Abstract The Abstract for this thesis Pivot Creek is located in the heart of the Alpine Dyke Swarm in the Haast River, South Island, New Zealand, which is the only known carbonatite locality in New Zealand. Petrological and geochemical analyses have been made of a suite of dyke lithologies, including a calcite-dolomite-hematite-Sr-REE carbonate-monazite carbonatite that metasomatises ( fenitises) country rock epidote greenschist. Analyses reveal extreme divergence from what is acknowledged, world-wide, as the 'typical' carbonatite LREEenriched composition with profiles of both major mineral constituents and bulk rock analysis exhibiting convex-upwards shaped, LREE-depleted, MREE-enriched patterns. These REE patterns are not common, but LREE depletions have been reported from several localities including; Fen Complex, Norway, the Gronnedal-Ika Complex, South Greenland, and Bayan Obo, China. Generally these hump-shaped patterns have been ascribed to post-magmatic loss of elements by fluid-controlled mobilisation, without any significant analysis of the surrounding country rock that is inferred to become enriched in these elements. Geochemical analyses suggest the 'unusual' Pivot Creek REE profiles can be attributed to highly oxidised carbothermal fluids rich in alkalis, Sr, Ba, P, and LREE. These residual fluids preferentially mobilise LREE in the carbonatite and country rock using COz, sol-, and P04- as the main complexing agents. Mass transfer calculations and Sr isotope analyses indicate fluid both emanates from, and diffuses back into the carbonatite dyke, producing ferrite aureoles that are extremely enriched in Na, K, Si, Ba, and AI and significantly depleted in Ca, Mg, Fe, LREE, and HREE with respects to the protolith greenschist. These results emphasise the importance of identifying the prominent role fluids play during carbonatite genesis, and suggest late stage fluid interactions between the carbonatite and surrounding country rock lead to significant chemical alteration of mineral and whole-rock systems. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Pivot Creek Thesis description Number of pages, maps, CDs, etc. 143 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 2010Collins Creator An entity primarily responsible for making the resource Collins, Alice Kathryn Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Petrology and geochemistry of the alpine dyke rocks at Pivot Creek Subject The topic of the resource Map petrology geochemistry Alpine Dyke rocks geochemistry. petrology Pivot Creek https://theses.otagogeology.org.nz/files/original/2e43754040d5e058eae9bc2bc8696374.pdf cd547ce6e786ce4ce53b42060da38700 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 ((170.546021910724846 -45.909302666524503,170.267271458731557 -46.152546149895599,170.110861646954135 -46.090114280022846,170.386507440564372 -45.906239878493096,170.546021910724846 -45.909302666524503)) Author last name Last name of the Author Bruce Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Gorman, A.R. Abstract The Abstract for this thesis The position of the offshore extent of the active Akatore Fault, a NE- SW trending reverse fault that ,runs along the coast SW of Dunedin is poorly constrained. The Akatore Fault is associated with several other offshore coast-parallel faults based on previously obtained shallow controlled-source seismic data. Accurate identification and positioning of these possibly active fault structures is crucial for producing accurate models of earthquake associated hazards in the nearby Dunedin urban area. Several earthquakes, including those of 1974 and 1989, are attributed to movement on these faults. Single-channel electro-acoustic 'Boomer' and CHIRP seismic reflection data were collected along with CAATI side scan sonar (C3D) along 89 lines. 484 km of 'Boomer' seismic data were collected over ~550 km2 ; only 293 km of Chirp seismic data and side scan sonar were collected due to weather conditions. The majority of lines were collected along NW -SE azimuths, running from just outside the surf zone (<10 m water depth) to a maximum of 28 km offshore (~75 m water depth). Survey lines were spaced approximately 250 m apart near shore and up to 5 km apart for offshore lines. One 'Boomer; line ties the 1978 Takapu-1A well. Most lines image distinct east-dipping reflections that correlate to the nearby CretaceousTertiary sequence. 'Boomer' subsurface penetration is generally only limited by the presence of multiple reflections. Primary reflections were recorded from sub-surface depths of up to 90 m. In several areas, internally reflective basement schist was interpreted. Several significant structures were imaged within the survey area: (1) the Akatore Fault, (2) the Green Island Fault, and (3) the Takapu Anticline. The Akatore Fault was imaged very near shore in the southern portion of the survey, and a minimum displacement of 55 m was calculated. Offset on the Green Island Fault, a large high-angle reverse fault was relatively well constrained to ~200 m (east side up). The data suggest that the Green Island Fault may be a step-over from the Akatore Fault. High-resolution imaging of the Takapu Anticline suggests that the Takapu Fault does not reach within ~80 m of the seafloor. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otago continental shelf Thesis description Number of pages, maps, CDs, etc. ix, 74, 3 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 2010Bruce Creator An entity primarily responsible for making the resource Bruce, Callum David Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Near-surface expression of active deformation on the shallow Otago continental shelf Subject The topic of the resource Geophysics Akatore Fault Otago shelf shallow controlled-source seismic https://theses.otagogeology.org.nz/files/original/26d5e1c934bf4eb18609d5dc45d12860.pdf 7db1ecc06f212fab11cbf6cfe7c3f9ff 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 Brown Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis The New Zealand micro-continent has been described as an amalgamation of various tectonostratigraphic terranes which were accreted on to the Gondwana margin. The origin of the accreted terranes is important in the understanding of Phanerozic Pacific tectonics. This study aims to help in the understanding of the provenance of the Torlesse terrane, which has been subject to extensive geological research for decades. A conglomerate horizo11; located on the southeast side of Lake Hawea was examined with the aim of using the conglomerate clasts to provide provenance information on the Torlesse terrane, in particular the Rakaia terrane. Conglomerate clasts are coarsegrained hand specimen size samples of the source rock, which have thought to have travelled a shorter distance than the fine-grained detrital material which make up the Otago Schist and therefore are able to be used to trace proximal sources. The size of the clasts also allowed for much more extensive geochronological, geochemical, petrographical and geothermometry analysis than that of the fine-grained lithologies within the schist and therefore provide a more confident indicator of provenance. An additional goal of the studywas to understand the effect of metamorphism and deformation on the clasts. Based on geochemical and mineralogical observations, the majority of the clasts can be classified as fractionated I-type tonalite. Petrographic observations show that the clasts have been subject to low grade metamorphism, with the presence of recrystallised quartz and microfractured feldspar, pressure shadows and growth of stilpnomelane. Petrographic and geochemical observations indicate that the clasts have been subject to metasomatic additions ofNa20, Si02 and C02 and the removal ofK20, Rb and Ba during progressive metamorphism and deformation. Titanium (Ti) concentration in quartz grains for the three localities was determined by LA-ICP-MS. These data were combined with the revised calibration of Thomas et al. (2010) to estimate crystallization temperatures. Results show that at low metamorphic grades the original igneous Ti-in-quartz temperature was preserved, but with increasing metamorphic grade and textural zone the temperatures re-equilibrate. 111 U-Pb zircon ages for the five selected clasts and a schist sample were determined by LA-ICP-MS. Four igneous clasts yield crystallisation ages, 253±3 Ma, 298±3 Ma, 332±7 Ma and 339±6 Ma. A quartzite sample has detrital zircons that range in age from 440 to 2650 Ma. Detrital zircons within a schist sample showed a prominent Permian to Triassic age peak and correlate well with the ages of the clasts. The crystallisation ages of the clasts and the detrital ages of the schist and quartzite broadly correlate best with crystallisation ages of igneous complexes located within Western Antarctica. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Hawea Thesis description Number of pages, maps, CDs, etc. vii, 137 : 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 2010Brown Creator An entity primarily responsible for making the resource Brown, Kirstin Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Provenance and metamorphism of conglomerates within the Otago schist, Hawea Subject The topic of the resource Geochemistry Hawea metamorphism Otago Schist provenance https://theses.otagogeology.org.nz/files/original/d928f8c1abe49b0652b6136202e52a4f.pdf 60abe1089d7d536abf6b4b55bb2cfa24 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 ((167.588377422254325 -45.964768535960133,167.601193313409539 -45.965733749964969,167.599907000707049 -45.973675389455451,167.587668810401738 -45.972022960682615,167.588377422254325 -45.964768535960133)) Author last name Last name of the Author Arthur Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Fordyce, R.E. Abstract The Abstract for this thesis The Earth’s climate has undergone a continuous evolution throughout geological time, with trends in warming and cooling providing points of study for scientists worldwide. One such trend of climatic change is the Mid- Miocene Climatic Optimum, a period of global warmth leading up to 14.7 Ma, followed by a period of global cooling from 14.7 to 13.9 Ma, triggered by orbital variation (Holbourn et al., 2007). The Waiau Basin, Southland, New Zealand, is well situated for paleoclimate analysis during this time period, with influence from the Southern Ocean providing records of global change. The Waicoe mudstone has a steady sedimentation rate of approximately 25 cm/kyr. This allows for high resolution sampling of one sample per stratigraphic meter, or approximately one sample every 4,000 years. This study examines a 150 m sequence that formed during an ~800,000 year period from 15.4 to 14.6 Ma. Environmental magnetism, micropaleontology and oxygen stable isotope analyses have been used to quantify the changing environment of the Waicoe mudstone in the Waiau Basin during this period. This thesis will address whether the environment of the Waiau Basin at this time was influenced by global cooling patterns and an expanding East Antarctic Ice Sheet, and whether climatic variations within the basin were driven by orbital variation. High resolution sampling also aimed to show small-scale changes within the climatic variation, as well as broader changes across the ~800,000 years studied. The data obtained indicate deposition in a deep, cold water basin. Paleomagnetic and micropaleontological results show evidence of at least five downslope movement events within the Waiau Basin in the time period studied. These events are associated with an influx of terrigenous material and specimens of the shallow, warm water foraminifera Amphistegina sp.. Stable isotope analyses from foraminifera tests (δ18O) are inconclusive because of poor preservation of foraminifera, as shown by common pyritisation and μm-scale recrystallisation. While the Waiau Basin may have been influenced by the global cooling indicated by other works (e.g. Field et al. (2009)), the lack of suitable foraminifera for stable isotope analyses means this hypothesis cannot be confirmed. The evidence of downslope movement events within the Waiau Basin, as well as the development of the basin in association with the Moonlight Fault System, suggests a strong local tectonic influence on the environmental changes of the Waicoe mudstone. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Bryce Burn Southland Thesis description Number of pages, maps, CDs, etc. x, 78 leaves : ill. (chiefly col.), col. maps ; 30 cm. + 1 DVD-ROM (4 3/4 in.) 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 2010Arthur Creator An entity primarily responsible for making the resource Arthur, Kristina. Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Paleomagnetic, micropaleontological and isotopic variation of the Bryce Burn section, Southland Subject The topic of the resource Paleomagnitism micropaleontology Environmental magmatism micropaleontology New Zealand. oxygen stable isotope Southland Waiau basin Waicoe mudstone https://theses.otagogeology.org.nz/files/original/1a2d3525bd3159852ed98507dc74a67d.pdf f7220180309363d8514a17e144b27158 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 ((169.738090972414852 -46.240028488223061,169.731951973512139 -46.239376701380095,169.736605080254066 -46.160922857891016,169.7771581430423 -46.11206443198342,169.834443968677476 -46.068419460907364,169.927605428075537 -46.054294019344447,170.029819354121116 -46.061761265952839,170.118025922487902 -46.075928466755748,170.18882585191264 -46.096744451599562,170.241866803869982 -46.131377271353429,170.275741826883376 -46.20839444619039,170.247596232854278 -46.29106733588312,170.151753844637994 -46.350633127436744,170.027089642645137 -46.366508081138228,169.917040529035688 -46.365972779065721,169.832964974345089 -46.332715142906238,169.770413576528739 -46.285717403689979,169.738090972414852 -46.240028488223061)) Author last name Last name of the Author Lindqvist Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Lee, D.E. White, J.D.L. Abstract The Abstract for this thesis Late Cretaceous-Paleocene nonmarine and shallow marine sediments of Pakaha Group in Kaitangata Sub-basin, 80 km south of Dunedin, provide a useful reference for exploration of the mainly-offshore Great South Basin. Deposition occurred in adjacent passive and actively subsiding zones west and east of Castle Hill Fault. Castle Hill Fault, a southern coalescence of Titri and Tuapeka Faults, has a northerly trend within the study area and extends offshore to the southeast. East of Castle Hill Fault, a lower 500+ m thick coal-bearing interval of Taratu Formation is overlain by a ~ 180 m thick interfingering assemblage of Latest Cretaceous-Paleocene paralic sediments; informally referred to as 'Golf Club succession' (GCs). GCs comprises a series of eastward-prograding, tide-influenced sandy pebble conglomerate units (included in upper Taratu Formation) and westward-onlapping transgressive sandstone bodies (included in Golf Club Member ofWangaloa Formation). Shoreface sandstones are locally cemented with calcite, dolomite, magnesian siderite, framboidal pyrite, and alkali feldspar. Clear authigenic overgrowths on detrital potassium feldspar grains are found throughout Wangaloa Formation. Evidence of syndepositional sulphide diagenesis related to meteoric groundwater seepage in the shoreface zone (massive pyrite cement, chimney structures, and pyrite-cemented walls of Rhizocorallium trace fossils) is present in one transgressive sand body. Tidal influence during deposition of granule and pebble conglomerate units interbedded with shoreface sands is indicated by abundant examples of paired mud drapes, tidal bundles, and Teredolites in transported wood. Mud-draped straight-crested conglomerate megaripples of ~ 1 m wavelength preserved in the upper part of GCs exposed near W angaloa Domain provide evidence of increasing activity of ocean swell waves approaching from the east. Overlying GCs, the upper 45 m of Wangaloa Formation assigned to Mitchells Rocks Member (MRM), consists of fine-grained sandstone and shell beds composed mainly of turritelline gastropods. Hummocky and swaley cross-stratification, megaripple bed-forms, and abundant Ophiomorpha burrows in MRM are consistent with deposition in a storm-influenced shoreface setting. Early Paleocene shoreline transgression and deposition of MRM across Castle Hill Fault zone in the Benhar area reflects a cessation in growth faulting, reduction in local coarse-grained sediment supply, and relative sea level rise. Anomalously high gamma radiation emitted by MRM is associated with monazite-bearing heavy mineral concentrations composed mainly of degraded ilmenite (pseudorutile) and zircon sand. Heavy minerals are interpreted to have been concentrated in the foreshore and Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Kaitangata Thesis description Number of pages, maps, CDs, etc. viii, 277 leaves : ill. (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 2009Lindqvist Creator An entity primarily responsible for making the resource Lindqvist, Jon K. Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Sedimentology of pakaha group, late Cretaceous-Paleocene, Kaitangata sub-basin, great south basin, New Zealand Subject The topic of the resource Sedimentology Coal facies analysis Pakaha group Great South Basin. Kaitangata