1 10 1 https://theses.otagogeology.org.nz/files/original/fae95c446d9cbc456a933f28961ddae8.pdf 22ad51f91b5ce759df185d363ab44937 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 McKercher Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Martin, C.E. Palin, J.M. Abstract The Abstract for this thesis Provenance of ancient and Cenozoic East Otago and Canterbury Basin sedimentary rocks, modern Haast River and Wairau River bedload river sediment have been investigated using titanium-in-quartz geothermometry grain size analysis coupled with petrography and detrital zircon geochronology. Titanium-in-quartz geothermometry allows determination of crystallisation temperature of quartz on the basis of measured titanium (Ti) concentrations at known pressure and titanium activity ( ). Calculated using the Ti-in-quartz concentration, temperatures can be precise (often better than ±15˚C) for quartz in igneous and metamorphic rocks. Temperature estimates for hydrothermal veins and detrital grains involve additional uncertainties. Analysis of quartz grains is relatively simple and rapid, with data obtained using LA-ICP-MS. Where loose sediment was sampled, grain size splits of 125 – 250, 250 – 500, and 500 – 1000 μm were analysed. To ascertain the possibility of variation in detrital quartz temperatures between grain sizes in sedimentary rocks. Within sediments inferred to be sourced from metamorphic rocks, higher temperature quartz is observed to occur with the smallest 125 – 250 μm split. Modern Haast River sediments represent detritus eroded from the Southern Alps through pumpellyite-actinolite greenschist to garnet-oligoclase amphibolite facies metamorphic basement rocks of the Alpine Schist. Detrital quartz temperatures were observed to vary between grain sizes analysed, with higher temperature quartz typically found within the 125 – 250 μm split. Comparatively the catchment of the Wairau River is composed dominantly of Torlesse Supergroup Greywacke and chlorite greenschist facies Marlborough Schist. A dominantly bimodal distribution was observed throughout all grain sizes analysed with no grain size partitioning of temperatures. Ancient sedimentary lithologies of the East Otago sedimentary sequence and Canterbury Basin reflect widespread marine transgression associated with separation and submersion of the New Zealand continent from Gondwana during the late Cretaceous to late Oligocene. Alpine Fault inception occurred during the Miocene and correlates with deposition of marine regression sedimentary sequences. Additional zircon geochronology was applied to the Green Island Sand to confirm Ti-in-quartz results and provenance interpretations. Ti-in-quartz geothermometry and zircon geochronology provenance interpretations have been found to agree with previous work on ancient sedimentary lithologies and inferred provenance of modern river sediments. Sediments analysed were able to be effectively correlated to basement rocks from around the New Zealand continent. Ti-in-quartz geothermometry has been found to enable provenance determinations from quartz-rich sediments which are geologically reasonable and in keeping with interpretations from studies using other provenance methods. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2630">http://hdl.handle.net/10523/2630</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 Island New Zealand. Thesis description Number of pages, maps, CDs, etc. xvi, 263 leaves b ill. (some col.), maps (some folded) ; 30 cm + 1 CD-ROM (43/4 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 2012McKercher Creator An entity primarily responsible for making the resource McKercher, Kate. 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 Titanium-in-quartz geothermometry: tracing siliciclastic sediment across the South Island Subject The topic of the resource Geochemistry east Otago geochemistry Haast River provenance quartz Sediment Titanium-in-quartz Wairau River