1 10 3 https://theses.otagogeology.org.nz/files/original/24bab10fbed5c5ad08b7217ba43042d8.pdf 5157f0cb7ecf8172be4a9f18aba8a874 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 (((171.303052248729 -44.9961429029632,171.711890051056 -45.2063152292055,171.619362892389 -45.2985952492034,171.229720706335 -45.0664819568099,171.303052248729 -44.9961429029632))) Author last name Last name of the Author Abbey Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Gorman, A.R. Abstract The Abstract for this thesis Submarine canyons are well documented, both around New Zealand and globally, but questions remain around the processes involved in their formation and evolution as well as around how their morphology reflects their developmental history. The Waitaki Canyon, located at the edge of the passive Otago Shelf in the Canterbury Basin, southeast New Zealand, presents an opportunity to investigate the near-surface features associated with a shelf-indenting submarine canyon using high-resolution seismic data. One such high-resolution survey was conducted in early 2015, collecting approximately 270 km of boomer seismic data in a high-density survey pattern centred at the head of the Waitaki Canyon. Approximately 40 km2 of the seafloor bathymetric data was also collected during that cruise. These data were analysed, along with approximately 100 km of boomer seismic data from a previous survey in the area and a selection of lower resolution seismic data from surveys conducted by the hydrocarbon industry, to investigate the subsurface structures in the vicinity of the Waitaki Canyon for evidence of changes in the canyon’s morphology throughout the Quaternary Period. South of the Waitaki Canyon, a large (several kilometres across) asymmetrical system of infilled paleochannels is intersected by a canyon-parallel survey line and canyon-perpendicular lines. Several high-order sequence boundaries are identifed throughout the survey area, and a region of seafloor depressions is observed on a ridge near the head of the canyon. Seismic reflections from the outer parts of the across-shelf survey lines are generally conformable, and do not show evidence of significant lateral migration of the canyon’s point of incision. The preferred interpretation of the stratigraphy and structures imaged in the data is that they represent the poorly preserved upper reaches of a series of paleochannels that had their heads somewhere west of the present canyon head and curved, or kinked, in very shallow S-shapes to rejoin the present path of the canyon. The canyon-parallel survey line thus intersects this kink and then approximately follows the centreline of the infilled channel, resulting in an asymmetric subsurface feature. The more recent symmetrical features are interpreted as non-axial tributaries or vestigial remains of this larger paleochannel. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/7400">http://hdl.handle.net/10523/7400</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. Waitaki Canyon Thesis description Number of pages, maps, CDs, etc. 142 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 2017Abbey Creator An entity primarily responsible for making the resource Abbey, Cameron James (Cam) 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 The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data Subject The topic of the resource Geophysics Canterbury Basin canyon geophysics Otago shelf Quaternary submarine canyon Waitaki https://theses.otagogeology.org.nz/files/original/9fda5ec88cdd7d296850caf135903ddf.pdf 4389506d4cb39df4bc243c6492aace0b 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 ((169.803805098021655 -46.349334619907715,169.80847962513451 -46.159608327205575,170.098445019135028 -45.956586659151704,170.294433198982205 -45.847385693662972,170.452614626812903 -45.927014399817466,170.423845552563904 -45.943976264091006,170.138071967022597 -46.197270506545365,169.995722106223695 -46.26696183473257,169.932460764114097 -46.289927770137339,169.913136552827609 -46.303695452017642,169.891819156723045 -46.314151100706567,169.863179033970084 -46.32217930731786,169.829793941895645 -46.334831492362461,169.803805098021655 -46.349334619907715)) Author last name Last name of the Author Litchfield Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Norris, R.J. Landis, C.A. Koons, P. Abstract The Abstract for this thesis The southeast Otago region forms the present leading edge of the outboard zone of continental collision between the Pacific and Australian plates. This study focuses on Quaternary motion of two northeast-striking, steeply southeast-dipping, reverse faults, the Akatore and Titri Faults, and subsidence of the Taieri Basin to the west. The Akatore Fault ( ~65km long) alternates between onshore and offshore segments; maximum throw along the central onshore segment is 130m. Holocene fault scarps are well preserved along the central onshore segment. Buried peat and wood horizons in blocked swamps along the fault trace, and two marine terraces preserved along the seaward edge of the block, together record two uplift events post-loess deposition. Radiocarbon dating constrains these events to ~1.15 and ~3.8ka. Uplift per event averages 3m, but increases to a maximum of 4m near the south end of the central onshore segment. Evidence for Pleistocene motion is predominantly from marine terraces; two terraces (35 and 65m) restricted to the Akatore block are interpreted to be 105 and 125ka in age, and indicate a period of Akatore Fault uplift between 80-125ka. From 80-3.8ka, however, the fault appears to have undergone a period of quiescence. The Titri Fault System is also ~65km long, but is probably linked at depth to the reverse Castle Hill Fault to the southwest. Structure contours drawn on basement of the coastal range indicates the "Titri Fault" is segmented; segment lengths range from 13-25km. Maximum total throw is ~650m. The fault system consists of a master fault and several frontal strands; the latter locally deform loess-covered alluvial fans. There is no evidence for Holocene motion. Alluvial fans can be divided into four sets; the oldest two are everywhere deformed, whereas the second-youngest is locally deformed near Moneymore. Optically stimulated · luminescence (OSL) dating provides some control on fan ages, as well as loess stratigraphy. These ages indicate that the last widespread deformation along the Titri Fault System was ~150-70ka, with localised deformation (Moneymore) occurring between 60 and 25ka. Uplift of a marine terrace interpreted to be 80ka in age further constrains the last period of widespread motion to ~80-70ka. Uplift of higher marine terraces indicates earlier fault motion between 125 and 400ka, with evidence from deformed alluvial fans for a major period of deformation and erosion during or stage 7 (245-186ka). The Taieri Basin is a tectonic depression on the downthrown side of the northern Titri Fault System. It is also faulted on its north-western margins by the west-dipping, reverse, Maungatua and North Taieri Faults. The latter faults have deformed alluvial fans of interpreted penultimate glacial and antepenultimate age, but not last glacial age, indicating middle and late Quaternary activity. Water bore logs, drillhole logs, a high resolution seismic survey and gravity surveys indicate the basin is asymmetric, with maximum depths of ~200- 300m occurring adjacent to the Titri Fault-system (southeast side), suggesting the Titri Fault System is controlling subsidence. Synthesising the above evidence for timing of fault movement leads to the interpretation that the Akatore Fault and Titri Fault System are moving episodically, on the time scale of tens of thousands of years. Furthermore, there is some evidence for switching between the two. Episodic behaviour is also recognised in central Otago, and supports the interpretation that the Otago reverse faults are linked by a sub-.horizontal, mid-crusta! ductile shear zone. Episodic behaviour has significant implications for seismic hazard analysis, both in Otago and worldwide. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otago Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : ill. (some col., some folded), 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 2000Litchfield Creator An entity primarily responsible for making the resource Litchfield, N. J. (Nicola Jane), 1972- Date A point or period of time associated with an event in the lifecycle of the resource 2000 Title A name given to the resource Quaternary deformation at the leading edge of the Otago reverse fault province Subject The topic of the resource Quaternary Structural Geology Tectonics deformation leading edge Otago Quaternary reverse fault province https://theses.otagogeology.org.nz/files/original/c6e29fb753e806f923199e680a01ecab.pdf da782bacaf0547d1a21af6a39ff4862b 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 ((170.61051438800007 -44.932552546999943,170.610123552000118 -44.933129753999935,170.608223058000021 -44.935076095999932,170.606665596000084 -44.937704596999936,170.604298963000019 -44.939965463999954,170.60212669900011 -44.941726113999948,170.601274180000019 -44.943135597999969,170.598906464000038 -44.943537311999933,170.597688730000073 -44.943557405999968,170.595973318000119 -44.943580797999971,170.592808856000033 -44.944402689999947,170.592446837000011 -44.944498793999969,170.589193481000052 -44.945399787999975,170.586036304000118 -44.94627116199996,170.583458799000027 -44.94699234199993,170.581736055000079 -44.948433285999954,170.579917941000076 -44.949336582999933,170.579849969000065 -44.949371191999944,170.579805450000094 -44.949374774999967,170.578221240000062 -44.949517645999947,170.577287277000096 -44.948021936999965,170.575915075000012 -44.946935789999941,170.575045551000017 -44.946886315999961,170.573467635000043 -44.946799681999948,170.57106577400009 -44.946479910999983,170.569307674000015 -44.945610758999976,170.568180986000016 -44.945110271999965,170.566054727000051 -44.946182518999933,170.564248323000015 -44.946950775999937,170.564119892000122 -44.948068944999932,170.563574154000094 -44.949007397999935,170.562608333000071 -44.949910116999945,170.563381831000015 -44.95098399699998,170.564042902000097 -44.951555887999973,170.563077075000024 -44.953381384999943,170.541820759000075 -44.952708439999981,170.542395660000125 -44.93467439099993,170.555291632000035 -44.916353151999942,170.576858047000087 -44.90564190799995,170.581810333000021 -44.90318287499997,170.588804929000048 -44.899707837999983,170.607104125000092 -44.900123223999969,170.632402008000099 -44.900690675999954,170.640378043000055 -44.900869400999966,170.634550955000122 -44.909128878999979,170.634358236000025 -44.91062391,170.632355203000088 -44.911767333999933,170.631975941000064 -44.911984741999959,170.627233529000023 -44.914697710999974,170.625932673000079 -44.917439670999954,170.624835435000023 -44.918497766999963,170.624739860000091 -44.91859035799996,170.623889708000092 -44.919410378999942,170.622523981000086 -44.9203684899999,170.621088898000039 -44.920528455999943,170.61795381100012 -44.922945048999964,170.615526233000082 -44.925880082999981,170.614412979000122 -44.927248347999978,170.614386386000092 -44.927279315999954,170.61258315900011 -44.929493277999939,170.61051438800007 -44.932552546999943)) Author last name Last name of the Author Grafe Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Sibson, R. Abstract The Abstract for this thesis The geological mapping of the Maerewhenua area had to deal with basement rocks, an assemblage of Cretaceous-Tertiary cover rocks and a thin strata of Quaternary cover rocks. The relationships between mapped rock units bear already a lot of information about the geological history. Two unconformities and one transitional disconformity were found, and referred to two major deformation events in the geological record: 1) The Rangitata Orogeny, and 2) The Kaikura Orogeny. Furthermore, a marine transgression occurred due to subsidence starting in the early Paleocene. Polyphase deformation of schist was investigated using mesoscopic structures. The results are mostly compatible to previous work at Danseys Pass. The deformation history is characterised by at least 3 to 4 different phases. Deformation occurred under ductile conditions as well as under brittle conditions. After mostly ductile deformation during the Rangitata Orogeny, peneplanation occurred that resulted in a schist peneplain having locally significant relief. Continuos subsidence in the Eocene to Miocene caused several marine transgressions. Glauconitic sand, silt and limestone were deposited in mostly shallow marine environment. In the Oligocene tholeiitic sills intruded unconsolidated sedimentary strata. Transpression during the Kaikura Orogeny results in brittle deformation of the schist, associated basement rocks and overlying strata since the beginning of the Pliocene. Strain-estimations for the ductile deformation of the basement rocks during the Rangitata Orogeny were derived from investigation of conglomeratic schist using the Rf/<)>-Method. "Pan-cake"-like deformed quartzofeldspathic clasts were shortened about 67% along the Z-axis. In comparison with previous work NORRIS & BISHOP (1990) such value implies schist close to the boundary of TZ 2B I TZ 3A. Sampling of basement rocks and petrographical work suggest subhorizontal isograds. No significant change in metamorphic grade was revealed over more than 6 km distance. The basement rocks of Maerewhenua area is exposed in Pumpellyite-Actinolite fades. A theoretical model was given to explain vertically foliation, vertical plunging, isoclinally folded bedding and subhorizontal isograds. Similar to findings by WARD & SPORLI (1979) rotation of bedding could not have been avoid. Rotation of large blocks might still be a problem. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Maerewhenua Thesis description Number of pages, maps, CDs, etc. 116 leaves : 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 1996Grafe Creator An entity primarily responsible for making the resource Grafe, Friedemann, 1971- Date A point or period of time associated with an event in the lifecycle of the resource 1996 Title A name given to the resource Geology of the Maerewhenua area, ranges west of the Maerewhenua area, or, "Wie lerne ich English in einem Jahr" Subject The topic of the resource Structural geology block faulting glaciation Quaternary terraces