1 10 79 https://theses.otagogeology.org.nz/files/original/4c608658f9e0ba677218e7e895515394.pdf eeca980a0a10ab9e146e741388c45f2b 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 Anderson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Landis, C.A. Reay, A. Abstract The Abstract for this thesis Beach and offshore sediments were systematically sampled and studied during this work. Textural studies resulted in both on and offshore sediments being modelled by mixing of two modes, a fine modern modal population and a coarse relict modal population. The modern mode is analogous for beach and offshore sediments, the relict mode is finer in the beaches than offshore. This fining is due to abrasion and drowning of coarser clasts by the transgressing sea. With the use of a microprobe, detrital grains were analysed and compared to analyses of minerals from inferred source areas. Appraisal of all textural, mineralogical and chemical data results in definition of the nature of the sources of the Kakanui sediments. Green hornblende and hypersthene are inferred to be derived from the rocks of the Waiau catchment or gabbroic bodies of southern New Zealand. Epidote and MnO rich garnets are derived from the Haast Schist Group. Brown hornblende, enstatite, spinel, clinopyroxene and pyrope garnet are derived from erosion of mantle derived material contained in the Kakanui Mineral Breccia or associated vents. A vent is concluded to occur approximately 4km offshore. Two sources for glauconite were concluded. Sediment from the Waianakarua River and coastal erosion of the Gees Greensand at Gees Point. Titanaugite are concluded as being derived from the Dunedin and associated alkalic volcanics of East Otago. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Kakanui Otago north Thesis description Number of pages, maps, CDs, etc. v. 180 p. ill. Photos. 30 cm. Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((170.88 -45.17, 170.92 -45.17, 170.92 -45.21, 170.88 -45.21, 170.88 -45.17)) 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 Beach and Continental Shelf Recent Sedimentation of the Kakanui District, North Otago. Identifier An unambiguous reference to the resource within a given context 1982Anderson Creator An entity primarily responsible for making the resource Anderson, SG Date A point or period of time associated with an event in the lifecycle of the resource 1982 Subject The topic of the resource Marine geology Sedimentary petrology Sedimentology Mineralogy beach sediment shelf sediment https://theses.otagogeology.org.nz/files/original/e01ae11e858f479159eb953dc63d060c.pdf 21b6bafd2c4dbf485047b9f2f7410730 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 Situmorang Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A. Campbell, J.D. Abstract The Abstract for this thesis Late Quaternary sediments in Shag Point and south Oamaru have been investigated. The Hillgrove Formation and loess deposits are distributed consistently throughout the coastal area. The lower part of the Quaternary sequence, Hillgrove basal gravel, consists predominantly of greywacke gravels and m1nor sands and silts. Two ecologic groups of macrofauna are recognised, intertidal and subtidal species. Intertidal species are Melagraphia aethiops., Micrelenchus tenebrosus., Cellana genera and the subtidal fauna consists primarily of Ostrea lutaria. This study clearly shows that paleoecology of these Quaternary sediments has close similarities with ecology of the modern fauna. Foraminifera paleoecology is in agreement with macrofauna and indicates shallow water environment. The restricted shallow water benthic foraminiferids, Notorotalia zelandica and Elphidium charlottensis are recorded abundantly. Paleoclimatic interpretations from planktic foraminiferids and Nonionella flemingi suggest a cold climate during deposition perhaps slightly cooler than mean sea temperature in present day. This evidence in conjunction with several radiocarbon 14C dates of shells (>45,000 yr.B.P.) and stratigraphic relationship with overlying sediments (loess deposits), suggest the Hillgrove basal gravel was deposited in Otiran Glaciation under interstadial conditions. The upper part, Hillgrove loose sand, is massive 1n exposure, always shows a gradational boundary with overlying sediments, and an absence of cross-bedding, suggesting a possibly beach origin. On the other hand sedimentological analyses including granulometric study and SEM investigation on quartz texture show strong evidence for an eolian origin. Loess deposits were classified into several types according to stratigraphic relations, macrofeatures and sedimentological analysis. The loess BI, moderately hard silt loam, shows conspicuous jointing pattern distinctively high proportion of green-hornblende, and is texturally coarser than other loesses. Heavy mineral study, particularly through ZTR index (Zircon-Tourmaline-Rutile) implies the presence of "intrastratal solution" in heavy minerals. This reflects the increase of maturity in older loess deposits. This might be associated with diagenetic features on the surfaces of quartz grains as quartz crystal growth, solution pits and adhering particles. Clay minerals have been observed in loess however it was not possible to distinguish between loess horizons on the basis of their clay minerals. Allogenic clays are presumed to consitute most of the loess, these are obviously of illite and kaolinite. Minor authigenic kaolinite is also present. Study of grain orientation in loess deposits gains two source paleowind directions, the central Otago and eastern Otago continental shelf. This interpretation accord with heavy mineral's provenance. Mineralogically the loess deposits are usually homogeneous, with angular monocrystalline quartz predominant. Feldspar consists mainly of plagioclase whilst potassium feldspar was found in minor quantity. Heavy minerals in loess are distinctive from other sediments (e.g. Hillgrove Fm, Recent sediments), phyllosilicate heavy minerals are in high percentages. In beach studies, grain slze analysis and dispersal pattern of some heavy minerals suggest longshore transport of beach material in a northwards direction. Furthermore it also noticed that the Shag River supplies considerable amounts of beach material to the Shag Point beaches, more obvious in phyllosilicate heavy minerals. Department The department where the student is studying primarily. Geology Thesis description Number of pages, maps, CDs, etc. 245 p. : illl. (some col.) ; 30 cm. Named locality Named locality describing the field area location. Shag Point Oamaru 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 Studies of late quaternary sediments Shag Point and South Oamaru coastal areas, South Island, New Zealand. Subject The topic of the resource Micropaleontology Quaternary geology Sedimentology Creator An entity primarily responsible for making the resource Situmorang, Mangatas. Date A point or period of time associated with an event in the lifecycle of the resource 1981 Identifier An unambiguous reference to the resource within a given context 1981Situmorang allogenic clay clay Hillgrove Formation quartz https://theses.otagogeology.org.nz/files/original/b439a02e201307969a64200964352929.pdf 2004c133cbecab7ca4987d86e0d74720 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 ((169.623945752000054 -46.361348229999976,169.586018962000026 -46.339589546999946,169.588986728000123 -46.289717161999931,169.610120442000039 -46.271260832999985,169.629175126000064 -46.272122759999945,169.623945752000054 -46.361348229999976)) Author last name Last name of the Author Simpson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A. White, J.D.L. Abstract The Abstract for this thesis This project examines the boundary between the Murihiku and Dun Mountain - Maitai Terranes, as well as the intervening strata of the Kaka Point Structural Belt, South-East Otago. Strata ofthe Murihiku and Dun Mountain -Maitai Terranes can be correlated with previously mapped units found inland, whereas the Kaka Point Structural Belt lacks clear correlatives. The Kaka Point Structural Belt shows both similarities and differences to both the Murihiku and Dun Mountain -Maitai Terranes, with previous authors provisionally including it within the Dun Mountain -Maitai Terrane. However, based on evidence from this field area, the Kaka Point Structural Belt is interpreted as a separate, "suspect" terrane. Within this field area the Dun Mountain -Maitai Terrane is represented by ophiolitic sea floor that was metamorphosed (Otanomomo Complex), then brecciated (Telford Breccia), and overlain by sedimentary rocks derived from a volcanic arc. Sedimentary features indicate deposition via storm-generated currents. The Kaka Point Structural Belt represents the deformed remnants of a turbidite filled basin, with the volcanic arc derived sediment originating from the east. Sediments were deposited either in a forearc or backarc basin setting. The Murihiku Terrane represents a large turbidite filled basin in which a regressive wedge propagated from southeast (arcwards) to the northeast (trenchwards). Most evidence favours a forearc basin setting although some evidence suggests it may have been a backarc basin. Outcrops of the Dun Mountain -Maitai Terrane and Kaka Point Structural Belt appear to be structurally controlled, with the structure developed during terrane amalgamation. Terrane amalgamation is responsible for the large scale folding of the Southland Syncline. Minor faulting and folding may also be the result of this terrane amalgamation during the Rangitata Orogeny. Evidence is also presented from mineral assemblages that suggest far greater burial depths for the Murihiku Terrane than for the adjacent Kaka Point Structural Belt and Dun Mountain -Maitai Terrane, thus implying a "boundary fault" is present between the Murihiku Terrane and the Kaka Point Structural Belt. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Murihiku Terrane Maitai Terrane Kaka Point structural belt Dun Mountain Thesis description Number of pages, maps, CDs, etc. ix, 144 leaves : 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 2002Simpson_B Creator An entity primarily responsible for making the resource Simpson, Brent Andrew. Date A point or period of time associated with an event in the lifecycle of the resource 2002 Title A name given to the resource Murihiku-Maitai terrane boundary, South East Otago Subject The topic of the resource Structural geology Otanomomo Complex Telford Breccia terranes turbidites https://theses.otagogeology.org.nz/files/original/77a3c3e56a9b2e335378715e9cc97d0a.pdf 6601e885a61e5ccf3a475529de8896a5 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 Tam Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Lee, D.E. Landis, C.A. Abstract The Abstract for this thesis This project undertakes a study of the Tertiary sediments of the Gore District, in the south of the South Island, New Zealand. Areas studied include the Copland Pit, Chatton, Balfour, Pomahaka, and Freshford localities. Tertiary sediments within the study area were analyzed to reconstruct the region paleoenvironment. These sediments include the Chatton Formation of the Copland Pit and Chatton area, Balfour Limestone, Pomahaka Estuarine Beds, and the Freshford Sandstone. Ages of these sediments were determined to be Duntroonian, indicated by biostratigraphic correlation of fossils. Lime concentration, grain-size analysis, fossil identification and diversity has been carried out, to interpret the paleoenvironment of each individual area. A paleogeography and reconstruction is inferred by this study for these five areas during the Duntroonian. The depth paleoecology of the Chatton Formation, in the Copland Pit, is inferred to be shallow marine (<30m), with the depositional environment a very fine sandy bottom situated in a relatively high-energy environment. While at Chatton, this sandstone with its storm-concentrated beds, indicates a shallower marine depth (<20m) than that at the Copland Pit, in an environment that was situated in the vicinity of the storm base. The depositional environment and water activity is inferred to be similar to that of the Copland Pit. The Balfour Limestone, situated at Balfour, indicates a depositional environment of inner to mid continental shelf. The depositional environment was a fine sandy bottom, within an increasing high-energy environment, with little input of terrigenous material. Pomahaka was an estuary (~0-1 Om) and the depositional environment was a muddy bottom. Freshford was a very shallow marine (<20m) and the depositional environment was of a fine sandy bottom. The terrigenous sediments from each locality appear to have been eroded from proximal local basement rocks. The Chatton Formation, in the Copland Pit, was derived from the nearby Murihiku Terrane; the Chatton Formation in Chatton was eroded from the nearby Maitai Terrane; while the Balfour limestone had little sediment input from the Murihiku Terrane. Interbedded relationship between the Gore Coal Measures and the Chatton Formation suggests several episodes of marine transgression and regression having occurred in the study area. The paleo-water temperature is inferred to have been~ 19-23°C, based on interpreted fossil ecology. The Copland Pit, Chatton, and Freshford localities were situated close to the paleoshoreline, while Balfour was located in an open sea and middle shelf environment. Pomahaka is interpreted to have been an estuarine environment at the mouth of a meandering, low energy river that flowed from east to west or alternatively, north to south. Topographic highs are inferred to have existed to the east of the Copland Pit, Chatton, Freshford, and Pomahaka localities, with open seas to the west or southwest. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Gore district Thesis description Number of pages, maps, CDs, etc. 92 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 2001Tam Creator An entity primarily responsible for making the resource Tam, Cecilia W. S. (Cecilia Wing Sze) Date A point or period of time associated with an event in the lifecycle of the resource 2001 Title A name given to the resource Paleoenvironment of the Gore District Subject The topic of the resource Paleontology paleoecology paleoenvironment https://theses.otagogeology.org.nz/files/original/e1fe15ecc2771e3ddace58761253b274.pdf 6280a5111c4af6ce3a2c364df3983812 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 ((170.689816912706505 -45.603782273102574,171.210400613860259 -45.740776281542402,171.110480283566886 -45.927777923803198,170.570974144855313 -45.778501229669608,170.689816912706505 -45.603782273102574)) Author last name Last name of the Author Osterberg Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Koons, P. Landis, C.A. Abstract The Abstract for this thesis A high-resolution seismic reflection and side-scan sonar survey was conducted over a ~220 km2 region of the Otago margin offshore the Otago Peninsula, including the narrowest (~ 10 km) portion of the continental shelf and the submarine Papanui Canyon. High-resolution seismic reflection data are integrated with multi-channel seismic reflection data, bottom samples, cores, bottom photographs and Remote Operated Vehicle (ROV) video footage collected by previous workers, to determine the timing and regulating processes of late Quaternary Otago margin evolution. Sequence · stratigraphic interpretation of the high-resolution seismic data reveals a total of eighteen regionally extensive seismic horizons separating fourteen seismic units, which are further subdivided into four late Quaternary shelf sequences. Sequence boundaries represent subaerial and fluvial erosion during sea-level regressions and lowstands, and are generally amalgamated with a shoreface ravinement surface created during the subsequent eustatic transgression. Deltaic and strandline deposits within the forced regressive systems tract, representing the falling stage of sea level, volumetrically dominate shelf sequences, and show a gradational or seismically undifferentiable boundary with highstand systems tract shore-connected wedges further landward. Forced regressive deltaic deposits include abundant mounded, oblique tangential clinoforms that show progressively lower elevations seaward across the shelf, a seaward-dipping superjacent sequence boundary, and internal truncation surfaces indicative of deposition during higher-order eustatic cycles within a lower-order forced regression. Lowstand shoreward-pinching deltaic and strandline wedges on the outermost shelf were deposited contemporaneously with massive canyon fill facies. Backstepping inner shelf wedges and barriers overlying transgressive incised valley fill facies were deposited during seventh-order (~I k.y.) eustatic cycles within fourth-order (~lOO k.y.) transgressions. Two chronostratigraphic models for the Otago shelf sequence have been proposed through correlation with eustatic curves from benthic foraminiferal ()180 ratios and uplifted coastal terraces. They are evaluated through analysis of the sediment accumulation rates, lowstand shoreline positions, and sequence architecture in each model, and compared to those of temporally constrained shelf sequences elsewhere. The youngest three sequence boundaries in the preferred model correspond to lowstands during oxygen isotope stages 2, 4 and 6, and thus the most recent fourth-order Otago shelf sequence contains two fifth-order (~40 k.y.) sequences separated by a stage 4 sequence boundary. Side-scan sonographs from ~ 120-250 m depth around the rim of Papanui Canyon display two characteristic reflection types. Type A reflections within the canyon head and on the north wall are interpreted as sand or gravel waves produced by canyon-parallel currents. Type B reflections on the north wall and a ~210 m deep inter-canyon terrace represent previously-documented carbonate slabs, ridges and debris associated with fluid expulsion. Papanui Canyon has developed through extensive retrogressive submarine mass movement over the past 500 k.y. or more, evidenced by extensive small-scale slumps, slides and debris flow deposits on the canyon wall. Gravity failure primarily occurs during sea-levellowstands when slope sedimentation rates are high and wave base is lower. . Earthquakes, internal canyon waves and fluid expulsion are also implicated as triggering mechanisms, and potentially induce slope failure during eustatic highstands. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otago Coast Papanui Canyon Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : ill., maps (some folded) ; 30 cm. + 1 computer disk. 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 2001Osterberg Creator An entity primarily responsible for making the resource Osterberg, Erich (Erich Christian) Date A point or period of time associated with an event in the lifecycle of the resource 2001 Title A name given to the resource Late Quaternary evolution of the Otago margin Subject The topic of the resource Quaternary geology Geophysics Continental margin Continental shelf Quaternary evolution https://theses.otagogeology.org.nz/files/original/28db17dcb13a6db08100f7213335789b.pdf 786769d6fadabb4126dbe4f8066bd87b 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 Dewdney Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Landis, C.A. Abstract The Abstract for this thesis Comparisons are made between analyses of the 3.5 phi fraction of floating and shore sand samples from an estuarine tidal channel in Blueskin Bay. A suite of minerals, common to both floating and shore sand, with a density greater than quartz and feldspar (density > 2. 769) is identified Relative. ·concentrations of the mineral suite are found to vary between all samples, and, an anomalous zone of ~0. 7ha with a relatively high concentration of the mineral suite is identified on the channel margin. The flotation process is found to preferentially select for the minerals with a density greater than quartz and foldspar. The relationship between grain angularity, surface wetability and ease of flotation is assessed. Grain angularity is indicated as an important parameter in the preferential flotation of the mineral suite. Transport of sand by flotation appears to be a one-way process and may be contributing to the relatively high concentrations of the mineral suite in the anomalous zone. The relationship between channel morphology, sea breeze/tidal dependence and floating sand deposition is discussed. It is estimated that 14 tonnes of sand per year are transported by flotation towards the head ofthe estuary. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Blueskin Bay Otago Thesis description Number of pages, maps, CDs, etc. vii, 50 p. : 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 2001Dewdney Creator An entity primarily responsible for making the resource Dewdney, Rob (Robert C.) Date A point or period of time associated with an event in the lifecycle of the resource 2001 Title A name given to the resource Floating sand in Blueskin Bay estuary Subject The topic of the resource Sedimentology Marine geology floating sand https://theses.otagogeology.org.nz/files/original/90b80904f42e95ee8c2bb6e621242176.pdf e8cb9c66cf47dcb3e4b95fe99f6c3e8b 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 ((167.790581266789701 -45.142539454861115,167.784902128490643 -45.189914685798385,167.704277034220468 -45.187623313151136,167.607989274395408 -45.137375066755084,167.617109768558436 -45.069211732443677,167.680825167103734 -45.070776709802033,167.790581266789701 -45.142539454861115)) Author last name Last name of the Author Zink Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Landis, C.A. Norris, R.J. Abstract The Abstract for this thesis After spreading ceased in the Tasman Sea in the Late Cretaceous, reorganisation of the Pacific-Australia plate boundary within the New Zealand region saw the development of several sedimentary basins during an extensional phase in the Middle Eocene to Oligocene. The Te Anau Basin was one of these basins. During this period, it opened adjacent to the eastern margin of Fiordland, a crystalline basement complex of Paleozoic to Cretaceous age, and is the main subject of this thesis. A detailed study of sedimentary facies occurring within the up to 7000 m thick basin-fill identified a vast range of lithofacies. Depositional environments represented include alluvial fans and braided and meandering rivers feeding deltas along the margins of the basin. Estuarine conditions are indicated by a diagnostic mollusc fauna. Shallow marine facies include an extensive limestone shelf represented by the Tunnel Burn Formation. A whole series of submarine fans such as the upper Sandfly Formation or the Turret Peaks Formation formed in deeper marine settings. These fans can be observed grading into a hemipelagic background mudstone mapped as Waicoe Formation. Faults controlling the Te Anau Basin are rarely exposed, but a comparison of sediment sequences allows reconstruction of kinematics, preferred orientation and timing of several fault systems. A NNE striking system, parallel to the basin axis and including the faults controlling the overall halfgraben geometry of the basin, directly reflects the regional tectonic setting. Pre-existing sets of NE and NW trending faults, cutting through Fiordland in straight lines, influenced sedimentation along the western basin margin where they cut it at high angles and produce distinct depocenters. Paleogeographic reconstruction of SW New Zealand shows the Te Anau and Waiau basins as separate entities throughout much of their history. The Te Anau Basin is shown here to have opened from the south as a north-south trending halfgraben, defining the eastern boundary of Fiordland. It is inferred to have been separated from the Waiau Basin to the east by an elongated basement high, which was subsequently destroyed during Pliocene to Recent compression. A northward connection of the Te Anau Basin with the West Coast Basins as proposed by several previous authors seems unlikely. The overall tectonic regime in which the Te Anau Basin developed is well constrained from seafloor data. This allows the sedimentary record of basin evolution to be compared directly to an independent plate tectonic model. The "tectonic signal" is isolated from the sedimentary record of the basin and compared with global models for extensional and strike-slip basins. Aspects of both are recognised, compatible with the transtensional origin indicated from plate tectonics. Changing tectonics towards strike-slip and finally transpression are also recognised within the sedimentary record. A possible modern analogue is the Gulf of California. However, basins opening at the head of the Gulf at present are strike-slip dominated. Only the southern Gulf underwent an early, rifting phase, followed by subsequent transtension. Basins related to this early rifting, like the Loreto Basin, are seen as the closest analogues to the Te Anau Basin. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3552">http://hdl.handle.net/10523/3552</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. Te Anau (Western Southland) Thesis description Number of pages, maps, CDs, etc. 1 v. (various paging) : 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 2000Zink Creator An entity primarily responsible for making the resource Zink, Christoph, 1968- 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 Middle Eocene to middle Miocene evolution of the Te Anau basin, western Southland, New Zealand Subject The topic of the resource Cenozoic Geophysics Sedimentology Tectonics basin evolution sedimentological history Te Anau tectonics https://theses.otagogeology.org.nz/files/original/3feec6be748a17a2da61dacdb110e973.pdf dd62066903371828768a41c4df4cd315 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 ((171.011464167962515 -43.631639864562665,171.076894604479492 -43.631687696364381,171.096524685303621 -43.648811356709118,171.086423250277619 -43.687949911794107,171.00371709886673 -43.657590553397071,171.011464167962515 -43.631639864562665)) Author last name Last name of the Author van Dusschoten Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Fordyce, R.E. Landis, C.A. Abstract The Abstract for this thesis Balmacaan Stream, Harper Range, central South Island, New Zealand is the first known Etalian (early Middle Triassic) locality in the Torlesse Supergroup. This study involved mapping of Torlesse rocks here, and collection of fossils for biostratigraphic, paleoecological and paleobiogeographical analysis. The Mt Taylor Group encompasses all Triassic-aged Torlesse Supergroup strata between the Rangitata and Rakaia Rivers. This area includes the Harper Range, which previously had been mapped as Balmacaan Formation - one of three Middle Triassic formations in the Mt Taylor Group. 50 field days spent reconnaissance mapping, measuring sections and collecting fossils, revealed three distinct sequences of strata on the northern slopes of Mt Harper, and southern tributaries to Balmacaan Stream. One sequence represents the previously described Balmacaan Formation which is amended, while the other two sequences represent the Mahaanui and Lake View Formations (both new). All are characteristically quartzofeldspathic. The Lake View Formation (basal) is dominated by thick-bedded flysch, consisting of alternating light grey sandstone and rarely fossiliferous (flora-bearing) dark grey siltstone. It also includes a conspicuous conglomerate lens near its top, and rare red and green siltstone. Graded beds indicate that the formation is overturned. Its base is unknown, while its top is disrupted by faulting, but this unit is essentially in conformable contact with overlying Balmacaan Formation, thus hinting at a Lower or pre-Etalian age. The overlying Balmacaan Formation (amended) consists of over 700 m of fossiliferous fine sandstone and siltstone, and subordinate medium and pebbly sandstone. Graded bedding and pressure expulsion structures indicate that the formation is south-dipping and northyounging (overturned), consistent with the underlying Lake View Formation. Marine macroinvertebrates (including ~13 cephalopod species) and woody plant remains occur at six or more levels throughout the formation. Defining the unit's base is a pebbly shellbed, containing abundant specimens of the bivalve Trigonia balmae (J36/f99). This bivalve, along with the molluscs Mellarium nodulosum, Parapopanoceras fraseri and Daonella jadii, are species characteristic of the Etalian Stage (New Zealand timescale), which correlates to the Anisian Stage (early Middle Triassic) on the global timescale. The Mahaanui Formation (?uppermost) constitutes over 500 m of thin-bedded flysch overlain by thick sheets of conglomerate interbedded with subordinate but conspicuous plant-bearing carbonaceous horizons. Above the folded basal strata, bedding dips and youngs steeply southeast. Vascular plant fossils are comparable to Permian forms from South Africa, but identifications are tentative, so a Permian age is not confirmed. The Mahaanui Formation is faulted against the Balmacaan Formation and possibly also against the Lake View Formation. Thus, stratigraphic relationships are unknown. If the Mahaanui Formation was considered to be uppermost, and involved in a near-continuous sequence, a broad shallowing trend would be evident, with Lake View Formation being distal, Balmacaan Formation middle and Mahaanui Formation proximal. 67 macroinvertebrates and one vertebrate are described, occurring at eight stratigraphic levels in the Balmacaan Formation. 55 are molluscs, of which 33 are bivalves, while 22 species of the total fauna are lmown only from float. The fauna is dominated by epifaunal suspension feeders, while free-swimming carnivores are also common. One fossil locality, J36/f94, possibly represents a life assemblage, with crinoids and brachiopod species apparently in life position, and is compositionally indistinguishable from an Etalian life assemblage in the Wairaki Hills (D44/f044). Direct comparison of the Balmacaan fauna and Etalian faunas of the Murihiku Supergroup (particularly the Wairaki Hills) has shown marked quantifiable similarity at species- and genuslevel. 33 out of 55 Balmacaan species and 33 out of 48 genera also occur in the Murihiku Supergroup, giving Simpson coefficient values of 0.60 and 0.69 respectively. Cephalopod and brachiopod faunas are particularly similar, giving species-level Simpson values of 0.88 and 0.81 respectively. These faunal-similarity numbers indicate physical closeness, and thus strong marine connections between the Torlesse and Murihiku depositional environments in the Middle Triassic, and throw doubt on previous ideas about Murihiku end Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Balmacaan Stream (mid Canterbury) Thesis description Number of pages, maps, CDs, etc. xi, 180 p, ill. , diagm, map (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 2000van-Dusschoten Creator An entity primarily responsible for making the resource van Dusschoten, A 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 Torlesse stratigraphy and paleontology, Balmacaan Stream, mid Canterbury Subject The topic of the resource Paleontology Lithostratigraphy fossils mid Canterbury stratigraphy Torlesse https://theses.otagogeology.org.nz/files/original/2d7e2e254b1187ad319b1c5e5ac4518c.pdf 959a4898301884eedb256eab673118d8 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 Thomas Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A. Reay, A. Abstract The Abstract for this thesis The Holocene stratigraphy of the Blueskin Bay estuary was investigated using percussion cores. The Blueskin Bay estuary Holocene sequence comprises eight lithofacies arranged into a central estuarine basin consisting of an exposed intertidal flat, a sheltered intertidal flat and two estuarine bay head deltas. The exposed and sheltered intertidal flats are occupied by marine-influenced to paralic sand accumulations consisting of transgressive to highstand open-bay/estuarine deposits. The estuarine bay head deltas are dominated by tidalfluvial highstand point-bar and channel-lag deposits. Radiocarbon ages from in-situ and reworked shell and organics are used to establish the chronology of the Holocene stratigraphy. Holocene marine deposition commenced during the post-glacial transgression (ea. 9-7ka) and was dominated by an open-bay depositional environment in the position of the present central estuarine basin. At the time of the maximum transgression (ea. 6.2 ka) the majority of the Holocene estuarine sediment was in place. Hightsand deposition has been characterised by a period of erosion within the central estuarine basin and the episodic accretion and progradation of the estuarine bay-head deltas and around the bay margins. A database of 18 radiocarbon dates from estuarine sediments of the Blueskin Bay estuary, of which 8 are unpublished, is presented in this study. The elevation data have been reduced to a common datum (Mean Sea Level, MSL) and the sources of error assessed. Using modern lithological and biological relationships relative to present sea-level, radiocarbon dates can be converted into paleosea-level indicators. The upper and lower limits of the paleosea-level dataset provide an envelope representing local relative sea-levels. The envelope is consistent with a culmination of the post-glacial transgression after 6.5 ka BP, followed by a minor regression of -1.4 m from 5.5-5 ka BP, followed by a minor transgression of+ 1.4 m between 5-3.2 ka BP. Twelve radiocarbon dates from estuarine sediments of the Papanui and Hoopers Inlets located on the Otago Peninsula, corrected to a common datum (MSL), are used to constrain a relative sea-level curve and provide a proxy for the relative sea-level curve of the Blueskin Bay estuary. The paleosea-level dataset for the Papanui and Hoopers Inlets indicates a stillstand of +0.2m occurred at ~6 ka BP, followed by a minor regression of -0.7 m between 6 and 3.8 ka BP, followed by a minor transgression of +0.5 m from 3.8 to 3 ka BP. As with the newly proposed Blueskin Bay estuary relative sea-level curve, the last 3 ka BP of the sea-level curve for the Papanui and Hoopers Inlets has been stable. Newly proposed relative and eustatic sea level curves for the Blueskin Bay estuary, Papanui and Hoopers Inlets provide additional reference localities for New Zealand Holocene regional sea-level studies. All available data from the Holocene sediments infilling the estuary of Blueskin Bay and the Papanui and Hoopers Inlets suggest there has been no tectonic uplift or subsidence of the East Otago coast or Otago Peninsula during the mid to late Holocene. The large core and radiocarbon database from the Blueskin Bay estuary allowed an analysis and interpretation of the systems tracts and parasequences developed during the late Holocene. Within this interpreted sequence stratigraphy, the transgressive systems tract (TST) corresponds to the sequence boundary between the basal Holocene/Pliestocene superimposed by a ravinement surface and/or marine erosion surface (MES-1 ). The maximum flooding horizon (MFH), peak eustatic sea-level horizon (PESH), and/or peak relative sea-level horizon (PRSH), defined as isochrons equivalent to the maximum transgression of the shoreline and peak eustatic or relative sea level [within a cycle] respectively (after Larcombe & Carter, 1998), are not necessarily marked by a physical surface/sedimentary boundary within the Blueskin Bay estuary. The majority of the Holocene sediments deposited within the Blueskin Bay estuary correspond to the highstand systems tract (HST) of the post-glacial sea-level cycle. A geochemical study of the Blueskin Bay estuary sediments reveals distinct provenance signatures and some evidence for trace metal contamination proximal to possible pollution point sources. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3245">http://hdl.handle.net/10523/3245</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. Blueskin Bay (East Otago) Thesis description Number of pages, maps, CDs, etc. 2 v. : 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 2000Thomas Creator An entity primarily responsible for making the resource Thomas, David Gregory, 1975- 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 Holocene stratigraphy and sequence architecture of the Blueskin Bay estuary, East Otago Subject The topic of the resource Quaternary Geology Marine Geology Sedimentology Blueskin Bay Estuary Holocene sequence stratigraphy https://theses.otagogeology.org.nz/files/original/171ef8889f87a0771b865ddd58033555.pdf 6773e1ff07fe1944036a9a86e9344595 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 ((175.522216037061327 -39.79124990119832,175.4812579325515 -38.644169169335079,176.368018536508259 -38.614832517611021,176.34761909443921 -38.075258937830661,178.027039773438702 -38.021563317215019,178.05637147964768 -38.68500653607741,178.091137416329104 -39.128135475442363,177.129928103281372 -39.753024704061417,175.522216037061327 -39.79124990119832)) Author last name Last name of the Author Segschneider Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Landis, C.A. White, J.D.L. Abstract The Abstract for this thesis The Taupo ignimbrite erupted from the Taupo Volcanic Centre, North Island, New Zealand, circa 1800 years ago. It has an estimated volume of 30 km3 and covered the topography over a circular area approximately 160 km in diameter, centred on a vent beneath Lake Taupo. Primary deposits of loose pyroclastic material reached thicknesses in the Hawke's Bay region of up to 40 m in valleys and topographic depressions (valley pond ignimbrite; VPI), and 1 m on hill slopes (ignimbrite veneer deposit; IVD), destroying hydrological systems and all vegetation throughout the impacted area. Sedimentary response to such large ignimbrite-emplacing eruptions from rhyolitic calderas is poorly understood. This thesis analyses the resedimentation of debris from this voluminous ignimbrite in the Hawke's Bay region, in order to understand post-eruptive surficial processes and as an aid in the assessment of hazards from future eruptions. Pumice pyroclasts behave in unusual ways in the sedimentary environment due to their low, and variable density. This unusual behaviour was addressed here by systematic sieving and automated settling tube analysis of water saturated pumiceous sediment, confirming that sieve analysis are misleading in respect to hydrodynamic behaviour of pumiceous sediments. This distinctive and different behaviour required the use of both lithofacies and petrofacies in the description and classification of the remobilisation deposits (chapter 2). Analysis of preserved remobilisation sediments along Hawke's Bay rivers showed that resedimentation occurred in two main stages, depending on the sediment:water ratio during the response period. Stage one comprised erosion and redeposition of the ignimbrite by lahars. Stage two was marked by decreasing sediment: water ratios, and the re-establishment of braided fluvial systems in the former river valleys. This sedimentary response pattern was revealed by grouping characteristic sets of eooccurring lithofacies into 4 lithofacies associations. Resedimentation of debris from the 1.8 ka Taupo ignimbrite is described and interpreted separately for each Hawke's Bay river system (chapters 3 to 5). Pumiceous deposits are preserved in a series of terraces in the ignimbrite covered area and beyond. The rivers are divided into headwaters, middle, and lower reaches due to their different sedimentary responses. The most prominent feature in the headwaters was stepwise incision into VPI. Along the middle reaches, partial erosion of VPI was followed by up to 20 m of aggradation of the valley floor by lahar deposits. Temporary lakes formed in tributary valleys that were dammed by aggradation in the main valley. Erosion of the lahar deposits followed, with up to 15 m of fluvial aggradation downstream from the most distal preserved lahar deposits along the Mohaka River. Similar fluvial aggradation reached up to 10 m along the Ngaruroro River, and up to 8 m along the Waiau River. Final degradation brought the rivers back into their pre-1.8 ka bed. Along the lower reaches of all rivers laharic and fluvial aggradation occurred. Fluvial aggradation averaged 2 m on the Heretaunga Plains. Individual catchment areas received between 3 km3 (Mohaka) and 0.07 km3 (Waiau) of primary ignimbrite. Of this initial volume, between 71 and 96 %respectively was removed by post-eruption remobilisation (chapter 6). Estimated times for the duration of the laharic and fluvial resedimentation periods lie between 3 and 17 years. Variations in resedimentation processes, and the duration of the inferred resedimentation periods between the three catchments are interpreted to reflect differences in: 1) initial ignimbrite volumes; 2) gradient of the rivers; and 3) number and size of tributaries unaffected by ignimbrite emplacement. Future volcanic hazards for the Hawke's Bay region from the emplacement of a similar-sized ignimbrite to the 1.8 ka Taupo ignimbrite at the Taupo Volcanic Centre are assessed based on the results from this study (chapter 7). River valleys downstream from their reaches affected by ignimbrite would experience major flooding events and lahars. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Hawke's Bay region Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : ill., maps (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 2000Segschneider Creator An entity primarily responsible for making the resource Segschneider, Beate, 1969- 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 Resedimentation of the 1.8 ka Taupo ignimbrite in the Hawke's Bay region, North Island, New Zealand Subject The topic of the resource Sedimentology fluvial resedimentation Taupo Ignimbrite