1 10 4 https://theses.otagogeology.org.nz/files/original/008c319e1a11b4692efdc3fb398d82ec.pdf cff367f6782e28e52740b695b75e39d1 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 ((168.356834553000112 -44.202371472999971,168.357703673000088 -44.201904965999987,168.362997982000024 -44.199062894999933,168.580416541000091 -44.0818919399999,168.582722294000092 -44.080644534999962,168.592502087000071 -44.075352579999951,168.629431234000123 -44.055353216999947,168.66722891100008 -44.034856599999962,168.669563141000054 -44.03358992099993,168.677300590000073 -44.029390426999953,168.685292653000033 -44.025051545999915,168.690149867000088 -44.029875921999974,168.716645853000045 -44.056175438999951,168.729659413000036 -44.069081731999958,168.742883184000135 -44.082189210999957,168.742967929000088 -44.082273186999927,168.749833806000083 -44.089075762999975,168.753323031000036 -44.0925320599999,168.764616250000017 -44.103715221999941,168.752049389000064 -44.110339372999924,168.730444928000111 -44.121720542999967,168.705892244000125 -44.134644375999969,168.592357499000087 -44.194261275999942,168.587073819000011 -44.197029935999986,168.571204623000114 -44.205342406999932,168.567702878000119 -44.207176041999958,168.541803735000059 -44.220730741999922,168.451512014000087 -44.267890087999938,168.330145482480305 -44.33077973281997,168.254523910000103 -44.257188086999967,168.282375906000084 -44.242284907999924,168.356834553000112 -44.202371472999971)) Author last name Last name of the Author Campbell Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Norris, R.J. Cooper, A.F. Abstract The Abstract for this thesis The Australian-Pacific plate boundary is an uncomplicated structure along most of its length in the South Island, New Zealand. In South Westland, south of the Arawata River, however, several terranes converge onto the Alpine fault. Inherent anisotropies arising from the position of pre-existing fault structures, lithological contacts and rheological heterogeneities within these give rise to an atypically diffuse and complex zone, the overall geometry of which resembles a regional scale transpressive flower structure. The flower structure is a broad deformation zone 60 km in length extending approximately 7 km from the Alpine fault to its eastern limit, the Dun Mountain Ophiolite Belt. Integral parts of the structure are the Hollyford Fault System and the Livingstone Fault System. The area is characterised by an array of left-stepping, subparallel faults with an average 060 strike linked by 020 striking structures. All fault traces offset Quaternary features. Fractions of the total interplate slip are partitioned across the reactivated structures. Additionally, kinematic indicators reveal partitioning of strike-slip and oblique/dip-slip deformation across the related secondary fault zones. The behaviour of the plate boundary zone in South Westland is fundamentally controlled by reactivation of the Hollyford Fault System and the Livingstone Fault System which partition slip away from the Alpine fault. As a consequence, the eastward transferral of slip onto the curved geometry of the converging fault systems has ultimately created a left-stepping contractional regime, the equivalent of a restraining bend in the plate boundary zone. The competent Dun Mountain Ophiolite Belt controls the geometry and evolution of the reactivated structures. It also acts as an indenter and imposes additional boundary conditions adding to the shortening component in the region and the onset of complex transpressional strain patterns. The geometry and kinematics of the flower structure in the upper crust is mimicked in the ductile mid to lower crust. Upper greenschist facies mylonites reveal a complex fold pattern developed in response to contemporaneous non-coaxial and coaxial deformation. The folding formed during a continuation of deformation associated with mylonitisation at depths within the fault system. The fact that strain localisation and transpressive strain patterns in the brittle crust continue into the ductile zones suggests there is a feedback relationship between the two regimes. The reactivation of pre-existing structures and the influence of rheological factors are considered as first order factors controlling strain partitioning in the plate boundary zone. Recognition of local strain partitioning is important for assessing slip rates and earthquake recurrence. Similarly, the faults extend down below the seismogenic zone so that interaction of the different structures with each other may produce changes in fault behaviour which affects earthquake nucleation. Although the Alpine fault is a major structure in the South Island of New Zealand with over 400 km of dextral movement, the reactivated structures still exert a degree of control locally on the structure and kinematics of the plate boundary zone. Reactivation of inherent fault structures has important implications for the initiation of plate boundary faults and the alteration of the plate boundary geometry with evolving deformation. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/491">http://hdl.handle.net/10523/491</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. South Westland New Zealand Thesis description Number of pages, maps, CDs, etc. xvi, 524 p. : ill., maps ; 30 cm. + 3 maps (folded) 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 2005Campbell Creator An entity primarily responsible for making the resource Campbell, Heather Gail. 1974- Date A point or period of time associated with an event in the lifecycle of the resource 2005 Title A name given to the resource Partitioning of plate boundary deformation in South Westland, New Zealand : controls from reactivated structures Subject The topic of the resource Map Structural Geology New Zealand plate tectonics rock deformation Westland https://theses.otagogeology.org.nz/files/original/ce6c199a5627b474262d6ccc113b6c46.pdf 5f32cc3a2ea7ae8738fd4f272c9c8605 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 ((169.012198067740655 -43.916285715078487,171.364720758842765 -42.718400780294587,171.450873179248049 -42.788218571237849,169.121663034268721 -43.996283201430948,169.012198067740655 -43.916285715078487)) Author last name Last name of the Author Campbell Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Craw. D Abstract The Abstract for this thesis Hydrothermal alteration, hosted in brittle structures, has been documented along the length of the Alpine Fault Zone. The along-strike profile has been divided into two geographical groups based on differing fault zone character. The central section, Havelock Creek to the Whataroa River, and the northern section, Whataroa River to the Taramakau River, host different late-stage hydrothermal assemblages. Alteration occurs as veins, cemented breccias, and partially or wholly recrystallised fault rocks throughout the -1 km wide fault zone. Geochemical investigations suggest that gouges, cataclasites, and mylonites within the hangingwall of the Alpine Fault Zone have been derived from a metabasite-poor, intermediate greywacke protolith of Torlesse affinity. Western Province derived fault rocks are not confirmed in the hangingwall. Cataclasites and gouges are retrogressed, hydrated equivalents of adjacent schist-derived amphibolite (upper greenschist) facies mylonite. CaO, MgO, Fe20 3\ and SrO are mobile while Ti02, Al20 3, and K20 are immobile within the Alpine Fault Zone. Most base metals show no distinctive enrichment or depletion trends. Cu and As occur in anomalously high concentrations at Dickson River and tributaries of Wainihinihi River, respectively. o13C and o180 results for vein and fault gouge calcites indicate a derivation from a meteoric fluid with a minor rock exchanged component (o13C -7.0 to 1.6%o; 0180 10.4 to 27.4%o; n=lO). The analysed ankerite veins and breccias were derived from a mixed, meteoric rock-exchanged fluid (o 13C -7.6 to 3.4%o; o180 12.1 to 25.2%o; n=21). Along-strike variation in isotope signatures is negligible. Retrogression within cataclasites and fault gouges is pervasive. Green mylonites have been thoroughly retrogressed under semi-ductile conditions while localised retrogression has occurred proximal to fault/ fracture systems within the Alpine Fault Zone. Ankerite is the dominant alteration phase in the northern section while calcite is the major alteration phase in the central section. Alteration volume is greater in the northern section where three hydrothermal breccias and numerous vein networks have been reported. No hydrothermal breccias and minimal vein networks are reported from the central section of the Alpine Fault Zone. Throughout the entire strike length of the fault zone, increases in metallic mineralisation correspond to increases in dilatancy and fluid-rock ratios (i.e. cemented breccias contain highest amounts of metals). Upper greenschist facies rocks, particularly chlorite-bearing, argillaceous-type mylonites, appear to be the best sources of ankeritic carbonate. Lowered geothermal gradients may also enhance ankerite stability and promote ferromagnesian mineralisation to the north. Strain and seismicity are closely linked to hydrothermal mineralisation. Local fault-fracture networks, especially high-angle minor faults, have acted as permeable flow networks channelising fluids and providing favourable mineralising sites. Gouges and cataclasites have acted as fluid distributors and poor mineralising sites. Active and passive porosity and permeability have been assessed for the Alpine Fault Zone. Passive estimates of porosity from several outcrops and specimens have permitted the extrapolation of passive and active porosity and permeability at depth during and shortly after seismic events. Using this approach, brecciated and fractured mylonite are found to be the most permeable mediums during passive (interseismic) periods. During active (eo- and post-seismic) intervals, fluids are believed to be discharged from fluid sinks (cataclasites, gouges) and focused onto backbone networks (i.e. minor faults, large fractures) within fractured mylonites. Brittle strain distribution is highest to the north, possibly associated with the crustal-scale Alpine-Hope Fault junction. This increased fault/fracture distribution correlates with frequent shallow earthquakes and elevated levels of hydrothermal alteration. The Wainihinihi River area, lying near the fault junction, contains anomalously high arsenic which is thought to represent a deeper fluid source. It is suggested that enhanced shallow seismicity has created a crustal plumbing network which taps deeper, metal-rich metamorphically-derived fluids. The nearby Wilberforce Valley (Main Divide) is characterised by similar arsenic, isotope and seismicity signatures suggesting that the hydrothermal systems may be regionally related. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Southern Alps Thesis description Number of pages, maps, CDs, etc. ix, 138, A27 leaves : col. ill., maps (some col.) ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2002Campbell Creator An entity primarily responsible for making the resource Campbell, Ryan (Johnathan Ryan) 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 Hydrothermal alteration within the Alpine Fault Zone Subject The topic of the resource Structural geology Geochemistry Mineralogy Tectonics Alpine Fault faults fluid distribution Hydrothermal alteration 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 Campbell Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Named locality Named locality describing the field area location. Waipiata Thesis description Number of pages, maps, CDs, etc. 81 p. : illus., col. map ; 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 1979Campbell Creator An entity primarily responsible for making the resource Campbell, Donald John Christianson, 1956- Date A point or period of time associated with an event in the lifecycle of the resource 1979 Title A name given to the resource Geology of the Waipiata district, Central Otago. Subject The topic of the resource Map Igneous petrology Metamorphic petrology Sedimentology gravel pumpellyite-actinolite Stranraer Group https://theses.otagogeology.org.nz/files/original/20f93653542989e7223f66b4ef6871d5.pdf 80ed70400da9c52ed50c02380d052870 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 ((167.892149226133654 -45.856918980420367,167.904984925198193 -45.725904754915206,167.905795527116169 -45.717009607397621,167.99622754501388 -45.722802637770492,167.98906770081868 -45.859435117016176,167.892149226133654 -45.856918980420367)) Author last name Last name of the Author Campbell Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Landis, C.A. Houghton, B.F. Abstract The Abstract for this thesis A detailed geologic map is presented of an area in the Wairaki Hills to the immediate east of the Takitimu Mountains (western Southland). The area involves rocks of the Takitimu Group, Productus Creek Group, Malakoff Hill Group and Cenozoic strata. The exact position and nature of part of the Takitimu GroupMalakoff Hill Group Contact is established and the Productus Creek GroupMalakoff Hill Group contact is described and inferred to be an angular unconformity. The Productus Creek Group is subdivided on a newly modified basis into four formations. The Elsdun Formation is redefined to incorporate the Weetwood Member which is interpreted on the basis of some new observations to be a lava flow, coeval with the Elsdun Formation. A number of new occurrences of Productus Creek Group are described, including a large body here named the Pleasant Creek Formation, from which a trilobite was collected and is here described. A large folded block of downfaulted Malakoff Hill Group is described and correlated with the Discaria Formation (Begg 1974), on the basis of general lithology and a tuff marker horizon. A lower Triassic plant fossil and a Daonella sp. fossil (Etalian Stage indicator fossil) are described from these rocks. On the basis of the relationship between Discaria rocks and a tuff marker horizon which can be traced through much of the Southland Syncline (Coombsl9SO, Watters 1951, Boles 1971, Begg 1974), an Etalian Stage is proposed for certain strata of the North Taringatura Hills and the Hokonui Hills. Petrographic studies of Productus Creek Group and Malakoff Hill Group sandstones provide evidence that Takitimu Group rocks were metamorphosed to prehnite - pumpellyite facies assemblages, uplifted and eroded during early to middle Permian time and into Triassic time. Strata of suspected Tertiary (possibly Cretaceous) age are mapped and described lithologically, and it is shown that some coarse sandstones contain pyroclastic detritus. . Inferences are made with regard to environments of deposition, metamorphism and structure. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Letham Burn Wairaki Valley Takitimu Mountains Thesis description Number of pages, maps, CDs, etc. 133 leaves. Ill, photos. Maps (folded 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 1975Campbell Creator An entity primarily responsible for making the resource Campbell, HJ Date A point or period of time associated with an event in the lifecycle of the resource 1975 Title A name given to the resource Geology of the Letham Burn Wairaki Valley Area, Southland. Subject The topic of the resource Map Lithostratigraphy Structural geology Permian Triassic