1 10 204 https://theses.otagogeology.org.nz/files/original/5f2bc6b0db044b3c2745438e4800abf1.pdf 8dadf29da60103db3f920a7405d1c093 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 ((171.141993295569534 -43.765957880366102,171.127225220069732 -43.752018963448187,171.147016256960001 -43.749661629394389,171.164890693597584 -43.756203465908939,171.182954471912808 -43.770189975952796,171.189934449726593 -43.783998554506027,171.166435988809894 -43.786303863846456,171.141993295569534 -43.765957880366102)) Author last name Last name of the Author Fittall Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Campbell, J.D. Abstract The Abstract for this thesis An area lying on the west side of the middle reaches of the Rangitata River is mapped and described. Basement Torlesse terrane rocks,·cretaceous conglomerate and Mount Somers Volcanics, an infaulted block of Tertiary sediments, and Quaternary Glacial outwash and alluvium are all present in the area. The basement Torlesse terrane rocks are subdivided into two facies, massive sandstone facies and siltstone facies for mapping purposes. The massive sandstone facies dominates throughout the area. The massive sandstone facies consists of sequences dominated by thick bedded massive sandstones with interbedded siltstone, occasionally graded, amalgamated and showing water escape structures. The massive sandstones are inferred to be of sediment gravity flow origin, deposited from sandy high density turbidity currents. The siltstone facies is subdivided into laminated siltstone and graded siltstone subfacies. These thin bedded laminated or graded siltstone sequences are treated as mappable where they are more than 10m thick. The siltstone beds are inferred to have been deposited from dilute turbidity currents. Measured sections are interpreted in terms of depositional environment. In terms of a submarine fan model the massive sandstone facies is inferred to be upper mid-fan distributory channel deposits and the siltstone facies interchannel deposits. Mineralogically the sandstones are lithic - arkoses and arkoses. The Torlesse terrane sediments are first cycle erosion products. The detrital mineralogy and the internal structures of quartz grains indicate a volcano-plutonic arc source terrane. Development of cleavage is well documented in these sandstones. A Middle Triassic to Permian-? Carboniferous age range is assigned to these rocks using petrographic trends defined by MacKinnon (1980). Three phases or folding are recognised, an initial macroscopic phase, Which is folded into a subregional isoclinal syncline which in turn is gently folded. An axial planar cleavage is developed in the isoclinal subregional syncline. A regional fault, inferred to have both Rangitata Orogeny and Kaikoura Orogeny movement, passes through the area. The Torlesse terrane basement has been subject to prehnite-pumpellyite facies metamoiphism locally reaching the pumpellyite-actinolite facies. Overlying the Torlesse on an angular unconformity is a lense of conglomerate, inferred to be fluviatile in origin. Overlying this conglomerate and lying directly on the Torlesse terrane basement by onlap, is the Mount Somers Volcanics consisting or a lower sequence of andesitic flows and an upper sequence or rhyolitic flows. Differentiation trends indicate that fractional crystallization was acting on the magma. The large volume or rhyolites and the presence or quartz xenoliths out or equilibrium with the surrounding magma may indicate assimilation or basement rocks as an important process. Xenoliths in the andesite also contain an anomalously Al-rich orthopyroxene. A transgressive sequence or Tertiary sediments is infaulted on the eastern border or the area. A zone of very low sedimentation is present within the upper parts or the Tertiary sequence. Glacial outwash also adhering to the slopes in some places, and alluvium cover the valley floors. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Rangitata Valley Thesis description Number of pages, maps, CDs, etc. 142 leaves : ill., 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/. Title A name given to the resource Geology of the mid Rangitata Valley Creator An entity primarily responsible for making the resource Fittall, Alan Matthew. Date A point or period of time associated with an event in the lifecycle of the resource 1982 Identifier An unambiguous reference to the resource within a given context 1982Fittall Subject The topic of the resource Map Metamorphic geology Sedimentary petrology Quaternary geology Structural geology Cretaceous Torlesse Supergroup https://theses.otagogeology.org.nz/files/original/766e0c42eaf45d2dbfad0aabc950e4df.pdf 0bd6125d9fd91011588b1c88929983a0 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 ((167.864041996000083 -45.996994626999935,167.863345847000119 -46.00451000399994,167.837204366000037 -46.003174422999962,167.820547991000012 -46.002319221999983,167.816739627000061 -46.002124123999977,167.819069958000114 -45.977970358999983,167.786756198000035 -45.976782788999969,167.790258830000084 -45.938431369999932,167.791076567000118 -45.929469774999973,167.791856768000116 -45.920916728999941,167.829181750000089 -45.92257782799993,167.84672885800012 -45.923354770999936,167.892861828000036 -45.92538615899997,167.892456088000017 -45.930466614999943,167.891996082000105 -45.936261414999933,167.88998188000005 -45.961556069999972,167.88910050000004 -45.97262892599997,167.866386939000108 -45.971619845999953,167.864041996000083 -45.996994626999935)) Author last name Last name of the Author Arifin Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Norris, R.J. Campbell, R.M. Abstract The Abstract for this thesis Early Oligocene to middle Miocene sedimentary rocks of the western Ohai district are mapped, subdivided into lithostratigraphic units. The geology structures are interpreted, based on field evidence and aerial photo study. Tertiary strata are folded and faulted, in the east of the study area they are faulted against the Twinlaw basement. Two major sedimentary sequences are recognized; a transgressive sequence represented by the Orauea Mudstone, the Birchwood Lower, Middle and Upper Members, and a regressive sequence represented by the Rannock Siltstone, the Feldwick Formation, the Reipihi Formation and the Lentile Formation. The relation between these two sequences is gradational. Evidence of hard ground submarine erosion occurs in the lower part of Feldwick Formation during deposition of the regressive sequence. The sedimentology of the Birchwood Middle Member is described in terms of submarine fan, a middle-fan depositional environment is interpreted to this Member. A biofacies analyses of benthonic and planktonic foraminiferal assemblages (after methods of Phleger and of Vella) is used to assist further the interpretation of depositional environments. Clay fractions of the fine-grained sediments were analysed by X-ray diffraction methods, and show that mixed two or three layers clay mineralogy is predominant in most of the samples analysed. Petrographic analyses of sandgrade sediments in the Birchwood Middle Member permit the conclusions that the main provenance of terrigenous components are plagioclase-rich intrusive and volcanic rocks of the Takitimu and Longwood massifs. The rocks of Feldwick Formation are described and grouped into lithofacies. Local variations in sea-floor relief and several transport mechanism involved during the deposition of Feldwick Formation in inner shelf environments are interpreted by megascopic and microscopic characteristics of the lithofacies. Petrographic analyses of some specimens of the Reipihi and the Lentile Formations suggest that two main provenances can be identified, i.e. a schist provenance and a granite provenance, and that these vary in relative importance within the formation. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Birchwood Ohai Thesis description Number of pages, maps, CDs, etc. 148 leaves : ill., 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/. Title A name given to the resource Tertiary geology of Birchwood area, near Ohai : South Island, New Zealand. Date A point or period of time associated with an event in the lifecycle of the resource 1982 Identifier An unambiguous reference to the resource within a given context 1982Arifin Creator An entity primarily responsible for making the resource Arifin, Maximon Shah, 1947- Subject The topic of the resource Map Lithostratigraphy Sedimentology clay analysis foraminifera biofacies paleoecology https://theses.otagogeology.org.nz/files/original/3f19a801659262b9551a86dd3a71bb8a.pdf 12d0b93d9d246505d2133d3704f1db22 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 ((168.462727735000044 -46.730259451999984,168.552406605000101 -46.73348425599994,168.547053688000119 -46.809635908999951,168.547048378000113 -46.809703277999972,168.45793118600011 -46.806536944999948,168.46263629200007 -46.730255980999971,168.462727735000044 -46.730259451999984)) Author last name Last name of the Author Webster Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Coombs, D.S. Abstract The Abstract for this thesis Ruapuke Island lies to the north-east of Stewart Island in Foveaux Strait. The area mapped consists mainly of dioritic rocks with small amounts of older gabbro and hornblende hornfels. A region of heterogeneous diorite is formed by partial assimilation of hornblende hornfels by dioritic magma. Trondhjemite, hornblende gabbro, granodiorite dykes and pegmatite veins have been examined and mapped where size permits. Metamorphosed flows, dykes and volcanic sediments of the hornblende hornfels, and the gabbro pluton, are correlated with the Brook Street and Eglington volcanics, probably forming part of an extensive Permian volcanic arc. Diorite and hornfelsic rocks are cut by basic dykes of hornblende-andesite composition, some of which have been intruded into hot dioritic magma. Field relations and petrography suggest that diorite emplacement may have taken place in more than one phase. Intrusive activity probably extended from late Permian into the Triassic. Devereux, McDougall and Watters (1968) have dated a tonalite from South Point by potassium-argon mineral dating at 217 m.y.s. Whole rock chemical analyses and mineral analyses of Ruapuke rock types have been compared to published analyses of Stewart Island and South Island contemporary rocks. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3919">http://hdl.handle.net/10523/3919</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. Ruapuke Island Thesis description Number of pages, maps, CDs, etc. 149 p. : ill. (xome 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/. Title A name given to the resource The geology of Ruapuke Island Creator An entity primarily responsible for making the resource Webster, J. G. (Jennifer Gaye) 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 1981Webster Subject The topic of the resource Map Metamorphic geology Igneous petrology Anglem Complex diorite hornblende hornfels https://theses.otagogeology.org.nz/files/original/7fa6b51ef0ff06c097a12e8b7cae2321.pdf 367be1ed6a192eaf915c74dc6cad2dfe 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 Named locality Named locality describing the field area location. Annear Creek Thesis description Number of pages, maps, CDs, etc. 118 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/. Title A name given to the resource Geology of Annear Creek. Subject The topic of the resource Map Igneous petrology Metamorphic geology Sedimentary petrology Creator An entity primarily responsible for making the resource Pillai, D. D. L. (Deirdre Dhana Lakshmi) 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 1981Pillai detrital pyroxenes Trabeculatia https://theses.otagogeology.org.nz/files/original/064a9a53f196cd9491e1c1f9a882ca6a.pdf deac61f514a421745ac82b5e9c9cb50b 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 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 of the east branch, Eglinton River. Subject The topic of the resource Map Creator An entity primarily responsible for making the resource Kelsey, Philip I. (Philip Ian) 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 1981Kelsey Dun Mountain Ophiolite melange https://theses.otagogeology.org.nz/files/original/a35c4d7120ba6360e3d4b4843a9c1a88.pdf 31bfb8c8d76f1213e08788d52f012aaf 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 ((169.866396627725351 -45.133923088606338,169.871963387087959 -45.124429863111018,169.892429392666003 -45.128561705121918,169.87646731121842 -45.162065329313592,169.852559779917243 -45.156049465566348,169.866396627725351 -45.133923088606338)) Author last name Last name of the Author Stewart Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Craw, D. McKenzie, D. Abstract The Abstract for this thesis A set of more than 30 mineralised normal faults and associated fractures cuts upper greenschist facies textural zone 4 Otago Schist between the North Rough Ridge and Rough Ridge drainage divides near Garibaldi Diggings, Central Otago. The mineralised structures strike northeast and dip steeply (60•) to the northwest. The zone of mineralisation is intense and occurs as a swarm of veins within a well defined area under 1 km2. Mineralised structures contain 1 cm to 1.8 m thick quartz veins which are traceable as an intricate network of structures for several meters along strike. In the near surface the mineralised structures are hosted within a thick zone of kaolinitized greenschist which developed beneath a regional unconformity surface and an overlying suite of auriferous terrestrial sediments. The thick zone of alteration forms a low northeast trending ridge and is heavily stained by secondary iron and manganese oxides. The source of the iron oxides may be due to the breakdown of iron bearing sulphide minerals within the mineralised structures or the oxidation of associated hydrothermal ankerite. Alternatively the breakdown of chlorite within the westerly dipping greenschist layer could also provide a source for the iron oxides. Quartz veins contain abundant breccias with variably altered clasts of quartzofeldspathic schist. The veins contain sparsely distributed scheelite mineralisation although no sulphide minerals can be observed in hand specimen due to the intense alteration within the host greenschist layer. Hydrothermal alteration of the host greenschist layer adjacent to veins cannot be differentiated from alteration developed beneath the regional unconformity surface due to the pervasive nature of this alteration. The normal faults and associated fractures of the Garibaldi vein swarm developed during middle to late Cretaceous extension whicih accompanied the uplift and exhumation of the Otago Schist belt. The vein swarm at Garibaldi may share affinities with the Manuherikia Fault Zone; a major northeast striking fault zone on the east side of the Manuherikia Valley, Central Otago. Detrital gold grains collected from both the Miocene and Quaternary paleoplacers at Garibaldi Diggings have secondary gold structures preserved on their surface. There is a consistency in morphology and surface textures displayed by detrital gold grains collected from the Garibaldi and Dell Creek placer deposit in the Lower Nevis Valley, Central Otago. The Garibaldi and Dell Creek placer deposits represent two separate parts of the Central Otago alluvial gold system. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Garibaldi goldfield Thesis description Number of pages, maps, CDs, etc. 79 pages : illustrations, maps, 2 folded maps and 4 sheets in pocket ; 30 cm. + 1 CD-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 2012Stewart Creator An entity primarily responsible for making the resource Stewart, James Alistair 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 Characteristics of gold bearing quartz veins at the historic Garibaldi goldfield, Central Otago, New Zealand Subject The topic of the resource Map structural geology central Otago alluvial gold Garibaldi goldfield gold https://theses.otagogeology.org.nz/files/original/3fd3e653fa194e60f214e23e09645121.pdf 3ffcb5fbb7da3c715ae133bc2a7bfa2a 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 ((169.3180911742418 -43.73210903800846,169.290124979484119 -43.746091432269949,169.309962396454836 -43.75745378946845,169.227474544786617 -43.801802646015332,169.252764188169152 -43.818119124029174,169.187283456968345 -43.864781921187138,169.083980542637647 -43.795777792576835,169.234755267341967 -43.685917606908262,169.3180911742418 -43.73210903800846)) Author last name Last name of the Author Ryland Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Cooper, A.F. Palin, J.M. Abstract The Abstract for this thesis Situated ~20 km northeast of Haast in a remote part of South Westland, New Zealand, the ~65 km2 Bald Hill-Maori Saddle region had not been mapped in detail prior to this research. This study provides a detailed account of the Bald Hill-Maori Saddle region’s geology and shows that it is dominated by metasedimentary and igneous basement lithologies, but also comprises a minor component of the Cretaceous-Recent South Westland stratigraphic sequence. It is also shown that the Bald Hill-Maori Saddle region has a complex structural history, with evidence for at least two separate major episodes of tectonism: Cretaceous extension and Cenozoic transpression. Greenland Group metasediments are the dominant lithology exposed within the Bald Hill-Maori Saddle region and consist of a tightly-folded and indurated metaturbidite sequence composed of interbedded, quartz-dominated, immature poly-cyclic psammites and pelites that have been regionally metamorphosed to lower-greenschist facies. Due to emplacement of the Whakapohai Granite ± additional concealed plutons to within 2 km of the current level of exposure, much of the Greenland Group within the Bald Hill-Maori Saddle region has been contact metamorphosed to biotite ± andalusite ± cordierite hornfelses. At the southeastern extremity of the Bald Hill-Maori Saddle region, situated between the Alpine and Wrong Faults and juxtaposed against Greenland Group metasediments across an intensely mylonitized décollement zone, the newly defined Cattle Track Gneiss consists of a poorly-exposed, amphibolite facies, mylonitic paragneiss equivalent to the Greenland Group, which was uplifted from the mid-crust during formation of the Cretaceous aged Maori Saddle complex. Hosted within Greenland Group metasediments, the Maori Saddle Granite, the Whakapohai Granite, and lamprophyre dykes constitute igneous basement rocks in the Bald Hill-Maori Saddle region. Incorporated as part of the Karamea Granitoids, yet separate from the sub-suites, the 384 ± 3.5 Ma, weakly fractionated, calc-alkaline, peraluminous, S-type Maori Saddle Granite exposed at the southern extremity of the Bald Hill-Maori Saddle region, was generated at the obliquely-convergent paleo-Pacific margin of Gondwana in response to crustal thickening associated with the Tabberabbean Orogeny and is most likely affiliated with similar plutons in Eastern Tasmania, Australia. Exposed as a stock midway up the Whakapohai River and as several pegmatite dykes between the Diamond and Wrong Faults, the newly discovered, highly-fractionated, calc-alkaline, peraluminous, S-type Whakapohai Granite is geochemically comparable with Karamea Suite plutons of the Karamea Granitoids. Thus, like Karamea Suite plutons elsewhere in New Zealand, it too was likely generated in an extensional environment associated with slab-rollback/abandonment or a one-off delamination event at the obliquely-convergent paleo-Pacific margin of Gondwana, during Mid-Paleozoic time. Two sets of lamprophyre dykes crop out in the Bald Hill-Maori Saddle region: alkaline lamprophyres in the Maori Saddle area; and calc-alkaline lamprophyres near the Munro Mistake-Whakapohai River confluence and in Mistake Creek. Alkaline lamprophyre dykes are Mid- to Late-Cretaceous in age, crosscut all basement lithologies except an intensely mylonitized décollement zone, and are affiliated with swarms of alkaline lamprophyre dykes that intruded Western Province rocks elsewhere in New Zealand during Cretaceous region-wide extension. Calc-alkaline lamprophyre dykes in the Bald Hill-Maori Saddle region form a north-south trending en echelon array and have a strong subduction-related geochemical signature, which implies an emplacement age coincident with when the Bald Hill-Maori Saddle region was last affected by subduction: during the Mid-Paleozoic. Consequently, these lamprophyre dykes are separate from all other known lamprophyre dyke swarms in New Zealand. Capping the summit of Bald Hill, the lower-member of the Otumotu Formation, the oldest unit of the Cretaceous-Recent South Westland stratigraphic sequence, consists of a flat lying/gently dipping fanglomerate deposit dominated by locally-derived quartz and Greenland Group detritus. The Otumotu Formation is Early- to Late-Cretaceous in age and infills extensional half grabens that formed within the detached upper-plate of the Maori Saddle Complex. Additional exposures of units constituting the Cretaceous-Recent South Westland stratigraphic sequence consist of: an Arnott Basalt feeder dyke that crosscuts the Otumotu Formation near the summit of Bald Hill; an internally faulted fault slice comprising Tauperikaka Coal Measures; Tokakoriri Formation Porphyry Point Member, and Tititira Formation; internally structurally complex Tititira Formation and Tauperikaka Coal Measures that constitute part of the vertical limb of the Coastal Monocline; and a thin veneer and a series of terraces composed of Quaternary aged alluvium, colluvium, paleo-river/glacial outwash, shallow-marine, and glacial moraine/till deposits. In Cretaceous time, following the Rangitata Orogeny, the Bald Hill-Maori Saddle region underwent region-wide extension and the Maori Saddle Complex formed. The Maori Saddle Complex is an extensional complex with metamorphic core complex affinities, which, like similar complexes elsewhere in New Zealand, comprises a ductilely deformed, high-grade, lower-plate (Cattle Track Gneiss) that has been exhumed and juxtaposed against a brittlely deformed, low-grade, upper-plate (Greenland Group) as a consequence of mylonitic shearing along a low-angle décollement zone. Due to Cenozoic tectonism, the Maori Saddle Complex has since been overprinted with Cenozoic structures, which add complexity. Cenozoic tectonism associated with the Early-Miocene propagation of the Alpine Fault Australia-Pacific plate boundary through New Zealand and the Late-Miocene to present transpression across it, caused uplift of a 10-20 km wide belt of Western Province rocks between the Alpine Fault and a steeply dipping reverse fault in basement rocks beneath the present-day coastline. As a result, the overlying Cretaceous-Paleogene-Neogene sedimentary and volcanic deposits were folded into the Coastal Monocline; of which, the flat lying/gently dipping Otumotu Formation at the summit of Bald Hill forms the upper-limb and the steeply dipping deposits along the adjacent coastal section form the vertical limb. Such Cenozoic tectonism also produced a series of northeast-southwest trending fault zones that crosscut the region, including the newly defined Mathias, Diamond, and Wrong Faults. Along each of these newly defined faults, the fault block to the southeast has been uplifted relative to the northwestern fault block and rocks from progressively deeper in the crust have been exposed. Ongoing transpression across the Alpine Fault Australian-Pacific plate boundary has uplifted ~740 ka paleo-river/glacial outwash terraces, deposited by the Haast River, by ~400-500 m. Likewise, 123 ± 7 ka paleo-shallow-marine terraces at Knights Point have been uplifted 113 m. Based on the ages and elevations of these terraces, average uplift rates in the Bald Hill-Maori Saddle region have accelerated from ~0.55 mm/yr (~740 ka to 123 ± 7 ka) to 0.86 mm/yr (123 ± 7 ka to present) during Mid- to Late-Quaternary time. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/1836">http://hdl.handle.net/10523/1836</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Bald Hill Southland Thesis description Number of pages, maps, CDs, etc. vii, 237 p. : col. ill., col. maps ; 30 cm. + CD-ROM (4 3/4 in.) in pocket. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2011Ryland Creator An entity primarily responsible for making the resource Ryland, Campbell Bradley Date A point or period of time associated with an event in the lifecycle of the resource 2011 Title A name given to the resource The Geology and Structural Evolution of the Bald Hill-Maori Saddle Region, South Westland, New Zealand Subject The topic of the resource Map Structural geology petrology Bald Hill Detachment Fault gneiss granite Greenland Group lamprophyre Maori Saddle Metamorphic Core Complex Otumotu Formation South Westland Structural Evolution https://theses.otagogeology.org.nz/files/original/2783491e875dae62cbbaea079d97e528.pdf 0743ebf8cee49186d3970591cf98e4f9 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 ((171.889084457509199 -42.238243702536231,171.9157039405018 -42.238021884604812,171.916129039198239 -42.250655142031015,171.889512601450207 -42.250400502527846,171.889084457509199 -42.238243702536231)) Author last name Last name of the Author Rayner Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Mackenzie, D. Abstract The Abstract for this thesis The Reefton Goldfield produced over 67 tonnes of gold between 1870 and 1951 and was the largest gold producer on the West Coast of the South Island of New Zealand. Current Mining operations run by Oceana Gold Limited commenced in 2007 at the Globe-Progress deposit. Mining currently operates in four open cut pits; the Globe-Progress, General Gordon, Empress and Supreme and is expected to produce 455,000 ounces of gold over 7 years. The Big River deposit was mined historically between 1882 and 1942, producing over 130,000 ounces of gold at an average grade of 34 g/t. Gold was recovered from a number of quartz rich reefs which were successfully worked with some grades reported as high as 63.7 g/t. The ore body was not exhausted however and although Big River was one of the largest producers in the goldfield there is no good description on the style and distribution of mineralisation. The Big River deposit is hosted within the Big River Shear Zone (BRSZ), which is hosted on the limb of the Big River anticline. Early quartz veins, deposited during/ soon after peak metamorphism (~400°C) were deformed in association with the regional folding of the goldfield, which produced upright N-NE trending folds (F2). The quartz veins accommodated deformation through dynamic recrystallisation at temperatures of ~355°C, with a flow stress of 83.9 ± 25 Mpa. Continued deformation is marked by the transition from ductile-brittle deformation of quartz veins below temperatures of 280°C. Brecciation of quartz veins is associated with the deposition of acicular arsenopyrite seams, pyrite veins and disseminated pyrite + arsenopyrite ± gold. Further decrease in deformation temperature resulted in the brecciation of pyrite veins and deposition of galena and ankerite veins with associated sericite wallrock alteration. Pyrite vein deformation also resulted in symmetric micro-folding of veins associated with a pressure solution crenulation cleavage formation (S4) with axial plane-parallel white calcite veins. The calcite veins were deformed at temperatures between 250°C and 200°C, with a differential stress of 239 Mpa. Chalcopyrite-sphalerite-pyrite bearing calcite veins were deformed at temperatures below 180°C, with a differential stress of 196 Mpa. Late stage gold + arsenopyrite + stibnite in-filled at shallow crustal levels associated with the exhumation of the BRSZ. Fine–grained disseminated gold is associated with acicular arsenopyrite and pyrite hosted within breccia zones. Visible gold is inter-grown with arsenopyrite with associated stibnite which infill fractures. Cu-Pb-Zn ± Mo + Ag anomalies indicate a magmatic fluid component at some stage during the evolution of the BRSZ (371Ma?) Early regional compression of Big River produced shear zone hosted mesothermal gold deposits with associated pyrite and arsenopyrite, hosted within upright to steeply inclined folds. As regional deformation continued, early structures were reactivated and new structures formed at new orientations discordant to previous structures. It is possible an influx of magmatic hydrothermal fluids associated with the rapid intrusion of the Karamea suite produced a relatively late stage of epithermal-style gold–stibnite ± Mo mineralisation. Late stage mineralisation (arsenopyrite + stibnite + gold) was introduced at shallow levels during Cretaceous exhumation. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Reefton Thesis description Number of pages, maps, CDs, etc. 165 pages : illustrations, maps ; 30 cm. CD-ROM 4 3/4in. 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 2011Rayner Creator An entity primarily responsible for making the resource Rayner, Anthony James Date A point or period of time associated with an event in the lifecycle of the resource 2011 Title A name given to the resource Structural geology and paragenesis of the Big River shear zone, Reefton goldfield, South Island, New Zealand Subject The topic of the resource Map Structural geology Reefton goldfield shear zone. Structural geology https://theses.otagogeology.org.nz/files/original/14fb041cc88da757209130c800306e78.pdf b9c67db33855a34db7352f9714252c58 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((169.329013117695297 -43.990804332721176,169.331935745807328 -43.959455718248279,169.399485419125511 -43.963036249729043,169.394773372522934 -43.991829032385262,169.329013117695297 -43.990804332721176)) Author last name Last name of the Author Collins Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Cooper, A.F. Abstract The Abstract for this thesis Pivot Creek is located in the heart of the Alpine Dyke Swarm in the Haast River, South Island, New Zealand, which is the only known carbonatite locality in New Zealand. Petrological and geochemical analyses have been made of a suite of dyke lithologies, including a calcite-dolomite-hematite-Sr-REE carbonate-monazite carbonatite that metasomatises ( fenitises) country rock epidote greenschist. Analyses reveal extreme divergence from what is acknowledged, world-wide, as the 'typical' carbonatite LREEenriched composition with profiles of both major mineral constituents and bulk rock analysis exhibiting convex-upwards shaped, LREE-depleted, MREE-enriched patterns. These REE patterns are not common, but LREE depletions have been reported from several localities including; Fen Complex, Norway, the Gronnedal-Ika Complex, South Greenland, and Bayan Obo, China. Generally these hump-shaped patterns have been ascribed to post-magmatic loss of elements by fluid-controlled mobilisation, without any significant analysis of the surrounding country rock that is inferred to become enriched in these elements. Geochemical analyses suggest the 'unusual' Pivot Creek REE profiles can be attributed to highly oxidised carbothermal fluids rich in alkalis, Sr, Ba, P, and LREE. These residual fluids preferentially mobilise LREE in the carbonatite and country rock using COz, sol-, and P04- as the main complexing agents. Mass transfer calculations and Sr isotope analyses indicate fluid both emanates from, and diffuses back into the carbonatite dyke, producing ferrite aureoles that are extremely enriched in Na, K, Si, Ba, and AI and significantly depleted in Ca, Mg, Fe, LREE, and HREE with respects to the protolith greenschist. These results emphasise the importance of identifying the prominent role fluids play during carbonatite genesis, and suggest late stage fluid interactions between the carbonatite and surrounding country rock lead to significant chemical alteration of mineral and whole-rock systems. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Pivot Creek Thesis description Number of pages, maps, CDs, etc. 143 leaves : ill. (some col.), maps ; 30 cm Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2010Collins Creator An entity primarily responsible for making the resource Collins, Alice Kathryn Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Petrology and geochemistry of the alpine dyke rocks at Pivot Creek Subject The topic of the resource Map petrology geochemistry Alpine Dyke rocks geochemistry. petrology Pivot Creek https://theses.otagogeology.org.nz/files/original/a38eb3b88ce9eb29671bf9c0554274b9.pdf b2be0493a72e5262c9e103d4fd1bd4d7 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 (((168.289025947832073 -44.556205842029527,168.25783549298103 -44.656142422435245,168.235549328610517 -44.704039793376978,168.133379315283719 -45.00515557092853,168.145671228285067 -45.11762260977379,168.174149534366876 -45.258164325873707,168.210282087288135 -45.38949286106007,168.240535598453391 -45.562004871214185,168.253986719718029 -45.583405572557787,168.278536734784808 -45.604074091579307,168.335953286580406 -45.648117278630544,168.379574082381851 -45.664779102154853,168.407690038934334 -45.684373070938719,168.407728678184498 -45.704618734160562,168.390169340733621 -45.721772499237211,168.318650086444194 -45.692659728521171,168.214722566426644 -45.616298282230957,168.184108366215952 -45.592382733648584,168.129868418977168 -45.39596856732846,168.068243606567876 -45.171816543794698,168.067602138129303 -45.003874921733171,168.185899293680279 -44.733839217537906,168.26566167766282 -44.554972645299216,168.289025947832073 -44.556205842029527)),((168.289025947832073 -44.556205842029527,168.289391225577901 -44.555033082645018,168.289295251419389 -44.556220028083551,168.289025947832073 -44.556205842029527)),((173.096746639994905 -41.718346011007576,173.018032613322333 -41.75591959311015,172.924959041773405 -41.739810418476793,172.936946882148789 -41.6826222856416,172.965588596028653 -41.625438519808043,173.015595540529262 -41.548584707492282,173.060732799217959 -41.473498225272913,173.127109826913198 -41.387646842503912,173.226540532460319 -41.314207988255383,173.335302785366082 -41.256743092110511,173.406030853544735 -41.20289043665646,173.523866745119022 -41.139851756920784,173.608242115022904 -41.058998242226437,173.725548523701775 -40.988604980486933,173.774040976614685 -40.898911055871267,173.792246978049661 -40.845159694610025,173.826643444634101 -40.771626401237498,173.877663259071056 -40.717620922412401,173.943087754169994 -40.692078082776156,174.011376382755259 -40.704013399679241,174.026044589227638 -40.741423949915962,173.951915637400987 -40.817138703647529,173.896413690600383 -40.889086889636658,173.822284418342747 -40.989743080327685,173.719541592584562 -41.086957581130335,173.562032968080757 -41.178997193847174,173.352094773088368 -41.296017647759228,173.165239078237164 -41.448371534307157,173.105992898087777 -41.537812478248185,173.108500391851834 -41.614668172717138,173.096746639994905 -41.718346011007576))) Author last name Last name of the Author Jugum Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Norris, R.J. Palin, J.M. Craw, D. Abstract The Abstract for this thesis Abstract The Dun Mountain Ophiolite Belt (DMOB) is an Early-Permian ophiolite sequence exposed in the South Island of New Zealand. The ophiolite is overlain by the thick deep-marine sedimentary Maitai Group. The Alpine Fault divides the DMOB into two sections, one in Nelson and the other in Southland. The DMOB is divided into three different units based on lithology and geochemistry: the Livingstone Ophiolite, which is a typical ophiolite sequence dipping sub-vertically and facing west; the Otama Melange, a deformed ocean-floor assemblage with no ultramafics or serpentinites and a greater amount of felsic rocks than the other two units; and the Patuki Melange, a highly deformed ophiolite structurally beneath the Livingstone Ophiolite. The Livingstone Ophiolite has three phases of igneous activity. The first phase is represented by cumulates, massive gabbro, and extensive pillow lavas. It has a MORB-like geochemistry with a subtle above-subduction signature. The age of this phase is 277.6 ± 3.3 Ma using U /Pb in zircon. The second phase locally intrudes the first with dykes which are feeders for extensive non-pillowed lava flows of variable thickness. The age of the second phase (275.2 ± 5.4 Ma) cannot be distinguished from the first. The second phase has a stronger above-subduction geochemical signature than the first phase. The third phase comprises felsic and intermediate dykes that cut the first two phases and intrude into the sediments overlying the DMOB. This phase has not been directly dated but has the same geochemistry as the felsic rocks in the Otama Melange. The igneous rocks of the Otama Melange are 50% felsic and have an age of 269.3 ± 4.5 Ma. The mafic and felsic rocks from the Otama Melange have a strong above-subduction geochemistry, but are not typical of arcs. The Patuki Melange contains both MORB-like and OIB igneous rocks in a serpentinite matrix. The MORB-like Patuki Melange is similar to the first stage of igneous activity in the Livingstone Ophiolite. Sediment blocks within the Patuki Melange have been correlated with the Maitai Group, based on their petrology and detrital zircon age pattern. These sediments have a youngest detrital zircon age of Late Permian through to the Early Triassic. The Maitai Group sediment are distal in character within the Patuki Melange and more proximal above the Livingstone Ophiolite. I infer that the Livingstone Ophiolite represents a fore-arc, and the Otama Melange a localization of the Livingstone ophiolites stage three igneous activity in that fore-arc (possibly due to ridge subduction). The Patuki Melange is either an off-scraping of a subducted slab or part of the trench wall of the above-subduction crust. The DMOB may have been part of the same ocean-crust as the Brook Street Terrane during its formation, but there is no specific evidence for this. Detrital zircons from the Caples Terrane are almost exclusively Triassic in age. The Maitai Group may have some time overlap with the oldest Murihiku Terrane. The DMOB is identical in geology and age to the Yakuno Ophiolite in Japan which may have once been part of the same subduction-zone before the opening of the Neo-Tethys. Detrital zircons from the Aspiring Terrane have a Jurassic age 154.1 ± 2.0 Ma, which constrains the age of the metamorphism of the Haast Schist. The DMOB has been highly deformed with evidence for extensional structure reactivated in compression on the sea-floor during igneous activity; however, most of the observed internal deformation in the DMOB is Cenozoic in age. The serpentinites are completely overprinted by the oblique compression through New Zealand since the Miocene. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Dun Mountain Ophiolite Belt Thesis description Number of pages, maps, CDs, etc. xx, 346 p. : maps, col. ill ; 30 cm. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/6875">http://hdl.handle.net/10523/6875</a> OURArchvive access level Open Access 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 2009Jugum Creator An entity primarily responsible for making the resource Jugum, Dushan Date A point or period of time associated with an event in the lifecycle of the resource 2009 Title A name given to the resource Tectonic synthesis of the Dun Mountain Ophiolite Belt Subject The topic of the resource Map Structural geology Dun Mountain melange Structual geology