Geochemical and stratigraphic evidence of environmental change at Lynch's Crater, Queensland, Australia |
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| Authors: | Joanne Muller Raphael AJ Wüst Dominik Weiss Yi Hu |
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| Institution: | aSchool of Earth Sciences, James Cook University, Townsville, 4811, Qld, Australia;bDepartment of Earth Science and Engineering, Imperial College London, SW7 2AZ, UK;cDepartment of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5PD, UK;dAdvanced Analytical Centre, James Cook University, Townsville, 4811, Qld, Australia |
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| Abstract: | This is one of the first applications of geochemical proxies to define changes in vegetation, hydrology and atmospheric dust influence on a peat deposit in the southern hemisphere. A 6.6 m deep peat record from Lynch's Crater in NE-Queensland, Australia, provides a sensitive  5000 to 30,000 cal years BP archive of environmental change. The deposit consists of 1.5 m of ombrotrophic peat underlain by a minerotrophic peat. Within the minerotrophic section, sponge spicules and diatom fragments offer evidence of prolonged flooding of the peat environment resulting in several layers containing (up to 50%) high inorganic material. The Ca and Mg data display episodes of enhanced dust influx and nutrient recycling and support previous palynological studies that show a Pleistocene to Holocene switch from sclerophyll woodlands to rainforest vegetation. |
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| Keywords: | peat stratigraphy geochemistry tropical mire Australia radiocarbon dates |
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