Australian dust deposits: modern processes and the Quaternary record |
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| Affiliation: | 1. Chengdu Center of China Geological Survey, Chengdu 610081, China;2. Post-Doctoral Research Station of Geology, Chengdu University of Technology, Chengdu 610059, China;3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;4. Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources, Chengdu 610081, China;5. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;6. Hubei Shale Gas Development Co., LTD., Wuhan 430071, China;1. Physics and Astronomy, Curtin University, Perth, Western Australia, Australia;2. Antarctic Climate and Ecosystems CRC, University of Tasmania, Hobart, Tasmania, Australia;3. Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia;4. CSIRO Oceans and Atmosphere Flagship, Aspendale, Victoria, Australia;5. Central Science Laboratory, University of Tasmania, Hobart, Tasmania, Australia;6. Environmental Research Institute of the Supervising Scientist, Department of the Environment, Darwin, Northern Territory, Australia;1. Katharinenholzstrasse 33 B, 14469 Potsdam, Germany;2. Friedrich-Alexander University Erlangen-Nürnberg, Institute of Geography, Wetterkreuz 15, 91058 Erlangen, Germany |
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| Abstract: | Dust raising and transport are common and important processes in Australia today. The aridity of the Australian continent and high climatic variability result in widespread dust raising in the arid and semi-arid areas and transport to the humid margins and surrounding oceans. The supply of erodible particles appears to be the greatest limitation on total flux of transported dust. Dust raising is greatest in the Lake Eyre Basin, including the Simpson Desert, and Murray-Darling Basin where internal drainage renews supplies of fine particles to the arid zone. In the west and northwest dust entrainment is low, despite considerable aridity. The marine record of dust flux shows at least a threefold increase in dust flux, compared with the Holocene, in the last glacial maximum in both tropical and temperate Australia, driven by weakened Australian monsoon rains and drier westerly circulation, respectively. Despite the widespread confirmation of aeolian dust deposits in southeastern and southwestern Australia, dated or quantified records are extremely rare. The dominant model of Australian dust deposits, the clay-rich ‘parna’, is shown to be poorly substantiated while modern and ancient dust deposits examined in detail are shown to bear a strong similarity to conventional definitions of loess. |
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