1 10 2 https://theses.otagogeology.org.nz/files/original/5cfbfcec2595f03db3591885da38e789.pdf 4bc9f16e64dceeeb2b149cbf894ac3b7 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 Simpson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis Lower Paleozoic rocks crop out along the length of the western South Island, forming New Zealand's oldest crust. They represent a sliver of the immense pile of sediments and volcanics that accumulated along the Paleo-Pacific margin of Gondwana. In NW Nelson, these rocks comprise two distinct tectonostratigraphic terranes, the Ordovician to Devonian Buller Terrane and Cambrian to Devonian Takaka Terrane. Low- to medium-grade metasedimentary and metavolcanic rocks of the Fanny Bay, Edgecumbe and Cameron Groups in Southwest Fiordland, have been proposed to represent a southern extension of these terranes on the basis of rare fossils and lithology. A thorough understanding of their tectonostratigraphic relations have, however, been impeded by the intensity of multiple episodes of metamorphism and deformation. This study, impelled by the GNS Science QMap Fiordland programme, provides geochemical and geochronological constraints upon the stratigraphy, depositional ages, provenance and correlations of these rocks. Whole-rock major and trace element compositions of metasedimentary samples are consistent with those of continent-derived passive margin sediments. REE patterns are uniform, with ubiquitous negative Chondrite-normalised Eu-anomalies (EuN/EuN* = 0.4 to 0. 7) signifying an upper continental crust source. Initial N d isotope values ( ENct = -7.2 to - 9.6 at 460 Ma) indicate that this crust was Proterozoic in age and chemical index of alteration values (CIA= 48-83) and oxygen isotope values (8 180 = +10.6 to +19.1) suggest it was moderately weathered. Subtle variations between the lithostratigraphic groups are also evident. Low CIA values (<58) and Th/Sc ratios(< 1) suggest a less mature, arc source of sediment in samples of the Edgecumbe Group. Elevated Ba (:::=: 1300) and V/Sc (20 to 86) in Cameron Group and correlative samples are indicative of a pelagic sediment component. Mafic metavolcanic rocks of the False Edgecumbe Formation exhibit high V/Ti ratios and REE patterns closely resembling those of arc volcanics in the Takaka Terrane. Distributions of concordant to slightly discordant U-Pb ages of detrital zircons (418 of 514 grains analysed) from two Fanny Bay and five Edgecumbe Group psammites are strikingly similar with two major peaks at 500-700 Ma (Ross-Delamerian and Pan-African) and 950- 1150 Ma (Grenvillian), with minor peaks at ea. 1400 and 1700 Ma, and scattered Archean ages. Similar detrital zircon age spectra have been reported for lower Paleozoic metasedimentary rocks from throughout eastern Australia and Antarctica and appear to be a characteristic of sediment deposited along the Paleo-Pacific margin of Gondwana. Zircons with trace elements diagnostic of alkaline rock parentage (Y <400 ppm, Lu<20 ppm) in the 500-700 Ma age populations suggest a sediment source in either East Africa or ice-covered East Antarctica. Upon the basis of their youngest zircons, Fanny Bay Group samples give maximum depositional ages in the earliest Ordovician (480-490 Ma), in agreement with previous fossil evidence, while the five Edgecumbe Group samples have slightly older maximum depositional ages ranging from early to mid-Cambrian (507-540 Ma). These and other geochemical characteristics support previous correlations of the Fanny Bay Group with the Buller Terrane. Definitive identification of an extension of the Takaka Terrane into Southwest Fiordland is more difficult due to similarities in the geochemistry and detrital zircon geochronology of the sedimentary successions in both terranes. These similarities extend throughout the Western Province indicating that the early Paleozoic terranes were in close proximity. That such similarities reach as far as the Australian and Antarctic fragments of the Paleo-Pacific Gondwana margin suggests that an extensive highland source provided detritus to a great marginal basin where efficient mixing allowed for the homogeneity of geochemical characteristics and detrital zircon signatures. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Fiordland southwest Thesis description Number of pages, maps, CDs, etc. xiii, 186 p. : 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/. Identifier An unambiguous reference to the resource within a given context 2006Simpson Creator An entity primarily responsible for making the resource Simpson, Chloe Charlotte. Date A point or period of time associated with an event in the lifecycle of the resource 2006 Title A name given to the resource Early Paleozoic metasedimentary rocks of Southwest Fiordland, New Zealand : petrology, geochemistry, and detrital zircon geochronology Subject The topic of the resource Petrology Geochemistry Paleozoic detrital zircon geochronology metasediments zircon https://theses.otagogeology.org.nz/files/original/3d77851907e410b3117ee2da85c54b78.pdf ab54e1a8eb018186790d08f2cfd34a2f 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 ((168.866838159000054 -44.040308308999954,168.811836166000035 -44.066529891999949,168.800933700000087 -44.071721519999983,168.792289420000088 -44.071403777999933,168.767919972000072 -44.070504426999946,168.754931720000059 -44.070022931999972,168.747124486000075 -44.069732780999971,168.729659413000036 -44.069081731999972,168.726346377000027 -44.06895792399996,168.710838105000107 -44.068377075999933,168.667006605000097 -44.066723827999965,168.664360327000054 -44.066623465999953,168.664369671000031 -44.066281370999945,168.66454250400011 -44.06438286499997,168.667228911000052 -44.034856599999955,168.667758788000015 -44.029028946999972,168.667993435000085 -44.026447866999945,168.674023434000105 -43.960024935999968,168.92807623300007 -43.834998200999962,169.057063008000114 -43.839253928999938,169.131079623000119 -43.841628985999932,169.144175835000055 -43.842044138999938,169.143955958000106 -43.846038211999939,169.143921250000062 -43.846668628999964,169.14357075700002 -43.853033945999982,169.143272874000104 -43.858442582999942,169.143145320000031 -43.860758239999939,169.141684950000013 -43.887255664999941,169.141570398000113 -43.889333012999941,169.141360793000104 -43.893133664999937,169.140479860000028 -43.909099300999969,169.139872108000077 -43.909392107999963,169.111934910000059 -43.922845150999933,169.109025057000053 -43.924245622999933,169.090306539000039 -43.933251182999982,169.089890323000077 -43.933451358999946,169.04650454800003 -43.95430148,169.041971133000061 -43.956478299999958,169.038598920000027 -43.958097318999933,169.011469346000013 -43.971115429999941,169.010344312000029 -43.971655009999949,168.932460480000032 -44.008957412999962,168.881460822000122 -44.033328609999955,168.866838159000054 -44.040308308999954)) Author last name Last name of the Author Randall 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 This report summarises findings from the first detailed study of the basement rock west of the Alpine Fault in the Haast region, South Westland, New Zealand. Long held assumptions about the hills rising out of the coastal plain being granite plutons was proven to be incorrect. Observed outcrops were dominated by Greenland Group metagreywackes with granite, observed only as minor sills. Quaternary associated glacial erosion is considered the best explanation for the current morphology of the conical knobs. Greenland Group metasediments are dominated by resistant, granofelsic psammite with thin subordinate interbanded pelites and minor calc-silicate bands. Sillimanite was observed in some pelite samples, allowing classification in the amphibolite grade for the metasediments. Quartz-albite-biotite-muscovite assemblages are common in psammite (quartz-rich) and pelites(biotite-rich) with expected variations in ratios between the two end members. This is a reflection of the homogeneous polycyclic continental source region. Geochemical analysis showed a minor increase in CaO and Sr when compared with samples from North Westland (Nathan, 1976). Two feldspar, subsolvus granites contained quartz, biotite and m1ca reflecting high K20/Na20. ASI and normative corundum values are typical of S-type crusta! melts (after Chappell & White, 2001) formed by local anatexis. Zircon saturation temperatures (Miller et al, 2003) determined that these low volumes partial melts were formed at low temperatures consistent with a crusta! source (650-800°C). These melting temperatures required significant fluid input into the crust (> 5wt %) for melt generation (Acosta-Vigil, 2003). Field relationships suggest that the granite melts were expelled during active deformation along cleavage planes in mechanically weaker pelite layers. Hornfelsic porphyroblasts developed in small contact zones ( <5m), are associated with granite intrusions and overprint earlier regional metamorphic rock fabrics. The folding of some granite sills appears to have been coeval with emplacement and no furthur metamorphic events are seen in the metasediments. Cross-cutting lamprophyre dikes can be correlated with late Cretaceous opening of the Tasman Sea. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Haast region Westland south Thesis description Number of pages, maps, CDs, etc. iii, 94 leaves : col. ill., col. maps (1 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 2004Randall Creator An entity primarily responsible for making the resource Randall, Scott Bruce. Date A point or period of time associated with an event in the lifecycle of the resource 2004 Title A name given to the resource Granite intrusions & Greenland Group metasediments from the Haast region, South Westland Subject The topic of the resource Sedimentology granite intrusions Greenland Group metasediments