1 10 2 https://theses.otagogeology.org.nz/files/original/413baca853d42e656fd60eb6c88cdc9b.pdf 7e4353d7d84f19efa28ca3c3e335e824 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 Rait Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Reay, A. Abstract The Abstract for this thesis Geochemical and mineralogical studies of paralavas and baked sediments were carried out on samples from Otago and Southland, New Zealand. Paralavas in this study contained plagioclase, pyroxenes, quartz, cristobalite, cordierite, mullite, magnetite, hercynite, glass and some unidentified phases. Wide compositional ranges occur for the glasses, pyroxenes and spinels. Pyroxenes display calcium tschermak and esseneite substitution. All pyroxenes are calcium rich clinopyroxenes. Plagioclases range from An5oAngo. Iron rich cordierites are present in samples from Croydon Coal Mine, Southland. A variety of cordierite morphologies are exhibited including hexagonal, spiral, skeletal, parallel cluster and multiple terminated grains. A complete range of glass compositions occur from 50wt% Si02 to 80wt% Si02 with respective decreases in iron contents. Quench textures are displayed by the spinels implying rapid cooling. The environment of formation for the paralavas involved disequilibrium and high temperatures. Cause of combustion may be by spontaneous combustion within the coal, bush fires or lightning. Paralavas have only been studied to a limited extent and more detailed study is needed to gain a complete picture of paralavas formation, chemistry and geological importance. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2706">http://hdl.handle.net/10523/2706</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otago Southland Thesis description Number of pages, maps, CDs, etc. vi, 132, (1) leaves (some folded) : 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 1992Rait Creator An entity primarily responsible for making the resource Rait, Rachel Jane, 1970- Date A point or period of time associated with an event in the lifecycle of the resource 1992 Title A name given to the resource Mineralogy and geochemistry of paralavas in Otago and Southland, New Zealand Subject The topic of the resource Mineralogy Geochemistry coal seam geochemistry Mineralogy Otago Paralavas sediments Southland https://theses.otagogeology.org.nz/files/original/438dba5a071710b861529ba2e169295c.pdf 7ad0815a938ecacbd793075f3122e7ed 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 Wilson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Reay, A. Landis, C.A. Abstract The Abstract for this thesis The Kaikorai estuary is a drowned river valley formed approximately 6000 years ago. Recently (about 100 years ago) a sand bar has formed, where the mouth of the estuary is today. The effect of the sand bar is to trap sediment within the estuary. The present day sediment is bimodal, a medium to fine grained sand and a medium silt. The sand grains have been derived from several source regions (Foveaux-Fiordland, Clutha, Catlins, local Tertiary sediments and Dunedin volcanics), and is, texturally and mineralogically, almost identical to nearby beach sands. Periods of heavy rain have washed loess, from the neighbouring paddocks, directly into the estuary. This Sediment combined with Haast Schist detritus form the medium silt. The estuary is exposed to climatic conditions, combined with the a small tidal variation (micro-tidal) produce a well dispersed sediment. The presence of industries within the Kaikorai Catchment, along with atmospheric pollution have produced high concentrations of trace elements in the estuarine sediments. These elements show preferred enrichment in specific grain-size fractions. MORB, Chondrite, Primative Mantle, and NASC normalized plots of geochemical data froom estuarine sediments all exhibit distributions indicative of continental derived material. The NASC plot exhibits enrichment of chromium and zinc and indicates that chromium and zinc may be anthropogenic. The distribution of elements on a variation diagram exhibit either similar element ratios to those of the source rock, or an increased element ratio attributed to another source (possibly anthropogenic). The concentration of vanadium observed in the estuarine sedimenls is the result of lithogenic components. Vanadium is therefore a good trace element to use with dete1minative variation diagrams. A conceptual model for an estuarine system is proposed. This model relates biological, chemical and physical parameters to the behaviour of sedimentary material and trace elements. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Kaikorai Thesis description Number of pages, maps, CDs, etc. vii. 57 p. ill, diagms, photos, 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 1989Wilson Creator An entity primarily responsible for making the resource Wilson, D Date A point or period of time associated with an event in the lifecycle of the resource 1989 Title A name given to the resource Geochemistry of Estuarine Sediments: The Kaikorai Estury. Subject The topic of the resource Soils Geochemistry geochemistry Kaitorai Estuary sediments