1 10 4 https://theses.otagogeology.org.nz/files/original/4cf8d43a4eb126535c97786789553cea.pdf 7304c147774e9250aa0993949ee7e8f7 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 MULTIPOLYGON (((170.01732476684 -46.2522487078296,169.986529340236 -46.2347707468098,170.196091498041 -46.0448322899835,170.233040363231 -46.0582359272952,170.01732476684 -46.2522487078296))) Author last name Last name of the Author Taylor-Silva Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Stirling, M.W. Abstract The Abstract for this thesis My thesis documents the first-ever paleoseismic trench investigation of the Akatore Fault, which has long been considered the most active fault to exist near Dunedin City. Two trenches were excavated across the fault in order to investigate the late Quaternary activity (timing, magnitude and recurrence of large ground rupturing earthquakes). Trenching investigations at Big Creek and Rocky Valley have concluded that there have been three ground-rupturing earthquakes in the Holocene. An antepenultimate event has been constrained between 10,400 ± 1,700 and 1,326 ± 22 cal. yr BP, while, the penultimate and most recent events have been constrained between 1,326 ± 22 and 776 ± 22 cal. yr BP. These events resulted in 5 m of dip slip, hence 1 - 2 m of surface displacement per event, which may to have produced earthquakes with moment magnitudes 6.8 - 7.4. Further studies at Taieri Mouth provided information on the longer term behaviour of the Akatore Fault. We estimated only 2 – 3 m of scarp development since the 125 ka marine terrace was formed. Since the Big Creek trench results indicated similar displacements achieved over three Holocene earthquakes, it is plausible that the scarp development has happened by way of these same three Holocene events. This would imply that there has been no activity along the Akatore Fault for a long period prior to these Holocene events i.e. little to no movement between 125,000 – 10,000 cal. yr BP. Furthermore, the Holocene slip rate along the Akatore Fault is significantly greater than the long term slip rate. This suggests the fault does not act in a characteristic fashion. It has an episodic / irregular behaviour. Similar behaviours have been determined for other Otago faults, which is problematic for forecasting future earthquakes. If inception of uplift along the Akatore Fault occurred ~1 Ma, the implied long-term slip rate is such that the fault may not yet have slipped enough in these Holocene events to accommodate the accumulated slip over the previous ~110 ka. The Akatore Fault needs to become the focus of a time-dependent seismic hazard calculation for Dunedin. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/7488">http://hdl.handle.net/10523/7488</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. Taieri Mouth East Otago Thesis description Number of pages, maps, CDs, etc. 184 pages A4 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 2017Taylor-Silva Creator An entity primarily responsible for making the resource Taylor-Silva, Briar Date A point or period of time associated with an event in the lifecycle of the resource 2017 Title A name given to the resource Akatore Fault; Reverse Fault; Fault Trenching; Holocene; Paleoseismology; East Otago; New Zealand Subject The topic of the resource Earthquake Geology Akatore Fault east Otago Fault Trenching Holocene New Zealand Paleoseismology Reverse Fault https://theses.otagogeology.org.nz/files/original/fae95c446d9cbc456a933f28961ddae8.pdf 22ad51f91b5ce759df185d363ab44937 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 McKercher Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Martin, C.E. Palin, J.M. Abstract The Abstract for this thesis Provenance of ancient and Cenozoic East Otago and Canterbury Basin sedimentary rocks, modern Haast River and Wairau River bedload river sediment have been investigated using titanium-in-quartz geothermometry grain size analysis coupled with petrography and detrital zircon geochronology. Titanium-in-quartz geothermometry allows determination of crystallisation temperature of quartz on the basis of measured titanium (Ti) concentrations at known pressure and titanium activity ( ). Calculated using the Ti-in-quartz concentration, temperatures can be precise (often better than ±15˚C) for quartz in igneous and metamorphic rocks. Temperature estimates for hydrothermal veins and detrital grains involve additional uncertainties. Analysis of quartz grains is relatively simple and rapid, with data obtained using LA-ICP-MS. Where loose sediment was sampled, grain size splits of 125 – 250, 250 – 500, and 500 – 1000 μm were analysed. To ascertain the possibility of variation in detrital quartz temperatures between grain sizes in sedimentary rocks. Within sediments inferred to be sourced from metamorphic rocks, higher temperature quartz is observed to occur with the smallest 125 – 250 μm split. Modern Haast River sediments represent detritus eroded from the Southern Alps through pumpellyite-actinolite greenschist to garnet-oligoclase amphibolite facies metamorphic basement rocks of the Alpine Schist. Detrital quartz temperatures were observed to vary between grain sizes analysed, with higher temperature quartz typically found within the 125 – 250 μm split. Comparatively the catchment of the Wairau River is composed dominantly of Torlesse Supergroup Greywacke and chlorite greenschist facies Marlborough Schist. A dominantly bimodal distribution was observed throughout all grain sizes analysed with no grain size partitioning of temperatures. Ancient sedimentary lithologies of the East Otago sedimentary sequence and Canterbury Basin reflect widespread marine transgression associated with separation and submersion of the New Zealand continent from Gondwana during the late Cretaceous to late Oligocene. Alpine Fault inception occurred during the Miocene and correlates with deposition of marine regression sedimentary sequences. Additional zircon geochronology was applied to the Green Island Sand to confirm Ti-in-quartz results and provenance interpretations. Ti-in-quartz geothermometry and zircon geochronology provenance interpretations have been found to agree with previous work on ancient sedimentary lithologies and inferred provenance of modern river sediments. Sediments analysed were able to be effectively correlated to basement rocks from around the New Zealand continent. Ti-in-quartz geothermometry has been found to enable provenance determinations from quartz-rich sediments which are geologically reasonable and in keeping with interpretations from studies using other provenance methods. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2630">http://hdl.handle.net/10523/2630</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. South Island New Zealand. Thesis description Number of pages, maps, CDs, etc. xvi, 263 leaves b ill. (some col.), maps (some folded) ; 30 cm + 1 CD-ROM (43/4 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 2012McKercher Creator An entity primarily responsible for making the resource McKercher, Kate. Date A point or period of time associated with an event in the lifecycle of the resource 2012 Title A name given to the resource Titanium-in-quartz geothermometry: tracing siliciclastic sediment across the South Island Subject The topic of the resource Geochemistry east Otago geochemistry Haast River provenance quartz Sediment Titanium-in-quartz Wairau River https://theses.otagogeology.org.nz/files/original/470051eb844d86ccd2e68e7a0d787e46.pdf 1424c8fe83a6d3e0565a11d17f45a40a 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 ((170.03288015343864 -45.326151565245354,170.06841811816804 -45.228897382181607,170.168130449338037 -45.229986350473176,170.261550301047464 -45.270897104090764,170.258762661429103 -45.307746037440886,170.124378972385955 -45.306106250860822,170.082433400924543 -45.327667384041703,170.03288015343864 -45.326151565245354)) Author last name Last name of the Author Dickie Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Sibson, R Abstract The Abstract for this thesis The Rock and Pillar Range, Central Otago, is an anticlinal box structure, formed during regional contraction in the Late Cenozoic. All Tertiary sediments have been eroded off the top of the range to expose basement Otago Schist. A sequence of Terrestrial Tertiary sediments; Dunstan Formation, Bannockburn Formation, Wedderburn Formation and Maniototo Conglomerate, at the base of the range have also been buckled in the late Cenozoic contraction. Several outcrops of Miocene basaltic lava flows of the Waipiata Volcanics overlie both the Dunstan and Bannockburn Formations. The Dunstan Formation in this area contains four different populations of quartz sand grains, which originate.from two different provenances; the Haast Schist and a granitic source. Striking E-W across the north end of the range for approximately 11 km is a -14 ° northdippingfault, the Pig Burn Fault (PBF) (new name)that juxtaposes low-grade schist in the hangingwall against high-grade schist in the footwall, indicating normal displacement. The hangingwall block is characterised by extensive brittle fracturing of the schist, which ranges from textural zone (TZ) 1 to 3A, and vertical extension veins filled with carbonate that strike parallel to the fault. The footwall block comprises TZ 3B schist and a -50 m thick mylonite zone adjacent to the fault. Displacement on the fault is estimated at -35 km dowri dip to the north. this is a very low-angle normal fault of regional extent, which shows most of the characteristic features, as described above, of a metamorphic core complex. The timing of this event is uncertain but must predate or partly overlap with cutting of the regional W aipounamu Erosion Surface during the Late Cretaceous. Limited ·structural· data suggests the probability that the very low-angle normal faulting formed along a zone of earlier reverse movement. There are similarities between the features and positions of the Pig Burn Fault and the Hyde-Macraes Shear Zone that suggest that they may be the same structural contact. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Rock and Pillar Range Thesis description Number of pages, maps, CDs, etc. vi, 110, [4] p. : ill. (some col.), maps (some col., some folded) ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1999Dickie Creator An entity primarily responsible for making the resource Dickie, Benjamin John, 1978- Date A point or period of time associated with an event in the lifecycle of the resource 1999 Title A name given to the resource Rock and pillar geology, Central Otago, New Zealand Subject The topic of the resource Structural geology east Otago faults Otago Schists https://theses.otagogeology.org.nz/files/original/a1c2ed96e7d281fd6ff64965f69be44c.pdf f60a9e56ab381bba15b70fc528d74a50 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 ((170.35543526779756 -45.919208938013341,170.355991241699257 -45.918243813558419,170.043981150781633 -45.912974297864054,170.045906476208415 -45.876706468024409,170.155660845794472 -45.880684196189222,170.157206154206165 -45.8336882422076,170.324064488563806 -45.835339268666829,170.326961365178789 -45.794634603837238,170.42562221251103 -45.796599896038025,170.419987119380636 -45.921138229147672,170.35543526779756 -45.919208938013341)) Author last name Last name of the Author Chadwick Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A. Abstract The Abstract for this thesis The Henley Breccia is a Middle to Late Cretaceous alluvial conglomerate that rests unconformably on the Otago schist. At the base it is characterised by clast supported pebble conglomerates interbedded wi!h sandstones and siltstones. A general 'upfan' and north westerly increase in clast size and angularity is recognised along with a decrease in the proportion of matrix, number of sandstone I siltstone interbeds, channel structures and degree of sorting. The upper beds are essentially massive and often characterised by a small number of exceptionally large boulders (> lm diameter). The Henley is here subdivided into seven lithofacies including four varieties of conglomerate. The conglomerates are defined mainly on the basis of clast size and internal structure. The seven lithofacies are grouped into four associations representative ofa range ) · I I / of debris flow and stream flood deposits. The whole sequence ranges from 900 ~o )40?0m in thickness and has a consistent 15-25" W to NW dip. \ . The conglomerate clast fraction is dominated by psammitic greywacke and semi-schist (approx 80-85%) with subordinate quantities (5-10%) of higher grade (textural zone >2b) schist, argillite ( approx 5 %) and quartz ( approX: 5%). The proportion of higher grade schist increases northwards. The low grade greywacke clasts contain between 5-20% quartz, 10-15% feldspar and 70-80% rock fragments. The rock fragments are dominantly volcanic (60-70%) with a subordinate but strong meta-sedimentary component (30-40%). Sedimentological, including paleocurrent data indicate that the Henley was deposited by streams and debris flows travelling west to east. The predominantly coarse, angular nature of the clast fraction points towards a relatively proximal source. Th~-age of the Henley is poorly constrained. From pollen dates the base is thought to be / I between! SO and 94Ma (i.e. late TS or early PMl zone) roughly corresponding to R~u17inara Series. The a~e of the top is only constrained by the unconformably overl~ing T~atti Formation which is of latest Cretaceous (Haumurian) agy_~-) Studies of clay minerals from the Henley indicates that the majority of the clay is detrital in origin with some minor authigenic smectite, chlorite-smectite and illite. Small quantities of calcium carbonate cement containing traces of manganese and iron are also present. The calcite is typically pore filling with a variety of irregular, although predominantly equant, crystal shapes. The Henley Breccia accumulated in a fault angle depression formed in response to rapid i\ downthrow along the southeastern side of the Titrrfaplt. Movement along the fault was initiated in response to Middle Cretaceous extension and the Henley beds are interpreted to have experienced syn-depositional rotation in response to continued listric normal movement on the Titri and Akatore faults. Following peneplanation, deposition of the Taratu and of an overlying marine transgressive sequense, a late Middle Miocene change in !" . plate vectors caused reversal of movement on the Titri fa~lt resulting in further rotation and j consequent steepening of the Henley Beds. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. East Otago Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : 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 1995Chadwick Creator An entity primarily responsible for making the resource Chadwick, Peter Vinton. Date A point or period of time associated with an event in the lifecycle of the resource 1995 Title A name given to the resource The Henley breccia Subject The topic of the resource Sedimentology east Otago Henley formation