1 10 4 https://theses.otagogeology.org.nz/files/original/02b4544fb20bbb7a07021e47e80edb9f.pdf 33fb6116348ad0773c107f5142233cf9 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 ((146.400629310389803 -62.676380892906927,143.924851479679688 -61.759811517438855,145.203297108326495 -60.736206524345491,147.832370771370989 -61.468229452711022,146.400629310389803 -62.676380892906927)) Author last name Last name of the Author Taylor-Silva Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Riesselman, C.R. Abstract The Abstract for this thesis The warm late Pliocene (~3.3 -3.0 Ma) is the most recent period with a warm climate similar to that predicted by climate models for the next century. Late-Pliocene temperatures were ~1.84 – 3.6°C warmer than the preindustrial era, while reconstructed sea level was ~25 – 35 m higher than today due to reduced global ice volume (Haywood et al., 2015, Dowsett et al., 2009). The East Antarctic Ice Sheet (EAIS) is largely grounded above sea level, therefore is inferred to be relatively stable due to reduced ice- ocean interaction. Along the Wilkes Land margin, however, a large sector of the EAIS is grounded below sea level, which makes it vulnerable to retreat. A collapse of the EAIS within the Wilkes Land sector would raise sea level by 3-4 m, and understanding the response of this region to Pliocene warmth may therefore help us evaluate future vulnerability. To investigate late-Pliocene EAIS behaviour, focus has been on a sediment core collected from the Wilkes Land margin by IODP Expedition 318. Site U1361A is located at 64°25’S, 143°53’E, at a water depth of 3454 m. Biogenic silica concentrations range from 56.5 - 85.4 mbsf (~3.8 to 2.8 Ma). Sediments with high concentrations of biogenic silica record periods when surface conditions were favourable to diatom productivity, while silica-poor sediments record periods of low productivity due to perennial sea ice cover or increased sediment delivery. Diatom assemblages within each silica rich interval provide further insight into sea ice distribution and sea surface conditions during late-Pliocene interglacials. By observing the distribution and relationship between warm, open ocean and cool, seasonal sea ice taxa inferences could be made about the state of the climate during this time. Diatom assemblages were found to be predominantly composed of warm, open ocean Fragilariopsis spp and Thalssiothrix spp. Between ~3.15 Ma corresponding the KM3 interglacial isotope excursion, unexpected high abundances of F. weaveri were observed. Using the model of (Barron, 1996) allowed us to assess the location of the polar frontal zone using a relationship between F. barronii, F. weaveri and Rouxia spp. Results from this indicated a shift in the polar frontal zone towards the south by ≥ 4 °S relative to modern day, which occurred during interglacials centered at ~3.15 Ma. During the late Pliocene, global warmth was great enough that it has migrated the entire southern ocean. system southwards. The late Pliocene warmth was also associated with a large increase in sedimentation rate from 30.1 m/m.y to 53.8 m/m.y which may reflect ice retreat and active erosion documented within the Wilkes subglacial basin during this (Cook et al., 2013). Species assemblages infer that climatic warmth began in the Wilkes Land margin ~3.2 Ma which is in agreement with records from Prydz Bay (Whitehead et al., 2005). The Northern Hemisphere glaciation began at ~2.7 Ma, however, diatom assemblages suggest that during the late Pliocene the Wilkes Land margin was largely ice free indicating that cooling may not have occurred until the early Pleistocene. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Wilkes Land margin Thesis description Number of pages, maps, CDs, etc. 81 pages 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 2015Taylor-Silva Creator An entity primarily responsible for making the resource Taylor-Silva, Briar Isabella, 1993 (Briar) Date A point or period of time associated with an event in the lifecycle of the resource 2015 Title A name given to the resource Reconstructing sea ice conditions and migration of the polar frontal zone in the warm late Pliocene, Wilkes Land margin, East Antarctica Subject The topic of the resource Geochemistry Marine geology Micropaleontology Paleoceanography Paleoclimatology biogenic silica diatom micropaleontology East Antarctic ice sheet stability Late Pliocene paleoclimate Polar Frontal Zone Southern Ocean paleoceanography 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/b551ac6ae50dcea46bc346e1bc7fb77b.pdf fead6e9d8dbc5dd34c004b2f24c17889 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 ((167.659741277376696 -45.789419166762961,167.78465853065677 -45.796991925653607,167.776436710499667 -45.944519274527046,167.646059374155953 -45.937039298934728,167.659741277376696 -45.789419166762961)) Author last name Last name of the Author Griffith Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Norris, R.J. Abstract The Abstract for this thesis The upper Eocene to lower Oligocene sediments along the eastern margin of the mid-Waiau Valley, Southland, record a change from fluvial-lacustrine and marginal marine (Nightcaps Group) conditions to deeper marine calcareous muds (Waicoe Mudstone). The Runungan age Beaumont Formation was derived from the Fiordland Complex to the west and deposited in distal to proximal sandy braided stream environments and locally in flood plain and lacustrine environments. The sudden late Eocene transition from terrestrial Beaumont Formation to marginal marine Orauea Mudstone resulted from a combination of basin subsidence and a eustatic rise in sea-level. Whaingaroan age sediments are missing in the study area due to 1500 + meters of normal movement on the westward dipping Waicoe Fault. Displacement on the Waicoe Fault probably occurred during the Whaingaroan (lower Oligocene) stage and is inferred to represent a major basin margin fault. Deep-water restricted benthonic Foraminifera in the upper Oligocene-lower Miocene Waicoe Mudstone indicate that basin subsidence had largely occurred by this time. The introduction of redeposited shelf debris during the Otaian and early Altonian suggest renewed basin margin tectonism. The occurrence of a lower Miocene diatomaceous ooze suggests local upwelling of nutrient rich water along the eastern basin margin. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Wairaki Station Waiau Valley Thesis description Number of pages, maps, CDs, etc. 100 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 1983Griffith Creator An entity primarily responsible for making the resource Griffith, Roger Clinton. Date A point or period of time associated with an event in the lifecycle of the resource 1983 Title A name given to the resource Tertiary geology of the Wairaki station area, Mid-Waiau valley, Southland, New Zealand. Subject The topic of the resource Map Micropaleontology Sedimentary petrology Paleobotany coal measures diatomite Foraminifera palynology https://theses.otagogeology.org.nz/files/original/8ad63cd96a6704b9517b359f88dd80af.pdf 1e77ecad9d723967eee3083c89bc33c6 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((170.806216422803317 -45.173344319788661,170.81105356604823 -45.073405011732987,170.923236713845398 -45.075739197704273,170.91554060127217 -45.176345547094058,170.806216422803317 -45.173344319788661)) Author last name Last name of the Author Sikumbang Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Campbell, J.D. Abstract The Abstract for this thesis The area studied for this project lies between Maheno to Oamaru, South Island, New Zealand. The area extends from Weston and Kia Ora 1n the north and to the Kakanui River (near Maheno) in the south. The type locality for the Maheno Limestone was previously defined by Gage (1957) at South Cape Wanbrow, Oamaru. In the present study a complete sequence of the Totara Limestone 1s defined southeast of Clark's Flour Mill, Reidston. Field work was carried out mainly from the middle to the end of February, and the area was revisited occasionally during weekends. The main object of the research was to establish the stratigraphic succession, the relationship to the Waiareka Volcanic Formation, and the nature of the Totara Limestone. This largely involved measuring the sequences of strata and collecting samples. More than one hundred and fifty representative samples were collected mainly in the Totara Limestone, but also from the Waiareka Volcanic Formation. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Oamaru Thesis description Number of pages, maps, CDs, etc. 109 leaves : illus., maps in pocket ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1976Sikumbang Creator An entity primarily responsible for making the resource Sikumbang, Nafrizal. Date A point or period of time associated with an event in the lifecycle of the resource 1976 Title A name given to the resource Study of the Eocene Totara limestone near Oamaru. Subject The topic of the resource Map Micropaleontology Sedimentary petrology Paleontology Cenozoic bryozoa Foraminifera Totara Limestone