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• W162380932 abstract "Kangaroo Island lies off the South Australian coast, in the Southern Ocean, between 35 o 30’ and 36 o 30’ south latitude, and 136 o 30’ and 138 o 30’ east longitude, on a broad expanse of continental shelf that extends southward from the mainland for approximately 100 km. The island itself lies adjacent to three peninsulas and two large gulfs (the Eyre Peninsula, Spencer Gulf, Yorke Peninsula, the Gulf of St. Vincent, and the Fleurieu Peninsula—proceeding in order to the south-east), and forms a boundary between the Lincoln Shelf in the northwest, and the Lacepede Shelf in the southeast. Kangaroo Island is essentially a south-west extension of the Mount Lofty Ranges. The island is also part of the Adelaide Geosyncline, and forms the southern part of the Fleurieu Arc Segment, encompassing the Kanmantoo Trough. The sub-surface geology is dominatedby clastic meta-sediments of Cambrian age. Kangaroo Island incorporates three distinct lithotectonic zones: the Northern Structural Zone comprising relatively unmetamorphosed platformal sediments, the Shear Zone Complex which follows the lines of the Snelling and Signet Faults, and the Southern Basinal Zone encompassing the Kanmantoo Group of metasediments. These rocks are generally poor in outcrop, as they are overlain in most areas by Tertiary laterites or Quaternary calcareous aeolianites. The island is essentially a dissected high lateritic plateau with lowland regions in the north-east and south. Dudley Peninsula is an isolated plateau connected to the island by Quaternary sediments. This thesis focuses on developing an aminostratigraphical, and chronostratigraphical framework for Bridgewater Formation aeolianite deposition on Kangaroo Island. This required the development of new longer range dating methods, and the use and improvement of existing methods(such as amino acid racemization dating). Amino acid racemization kinetic experiments were performed on molluscs, foraminifers, and (for the first time) whole-rock carbonate rich sediment, in order to compare the racemization forward rates of various amino acids (GLX in particular) and the changes in the individual amino acid rates across material types, i.e., molluscs, foraminifers, and whole-rock. In the context of the Kangaroo Island samples, and the analysis methods employed, GLX was identified as the amino acid with the most utility (in terms of range, stability, and concentration). It was also revealed that for the Kangaroo Island samples the amino acid GLX was the most compatible (in terms of racemization rate) across many genera of molluscs, and two genera of foraminifers. This thesis has used luminescence, U-series, 14 C, and independently calibrated amino acid racemization dating (for the first time using the aminoacid GLX) to establish an aminostratigraphical and chronostratigraphical framework for carbonate deposition on Kangaroo Island. In order to do this a new long-range, single aliquot, luminescence dating method…" @default.
• W162380932 created "2016-06-24" @default.
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• W162380932 date "2011-01-01" @default.
• W162380932 modified "2023-09-23" @default.
• W162380932 title "Aminostratigraphy and luminescence dating of the Pleistocene Bridgewater formation, kangaroo island, South Australia: an archive of long term climate and sea-level change" @default.
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