A late Quaternary sedimentary record of steryl alkyl ethers from offshore southeastern Australia |
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| Institution: | 1. NIOZ, Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, 1790 AB Den Burg, The Netherlands;2. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;1. Institute of Earth and Environmental Sciences, University of Freiburg, Germany;2. School of Geography, University of Melbourne, Australia;3. GeoQuEST, School of Earth and Environmental Sciences, University of Wollongong, Australia;4. Australian Nuclear Science and Technology Organisation, Australia;1. School of Geography, Planning and Environmental Management, The University of Queensland, Brisbane, QLD 4072, Australia;2. College of Arts, Society and Education, James Cook University, PO Box 6811, Cairns, QLD 4870, Australia;3. School of Earth, Environmental and Biological Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia;4. Department of Environmental Sciences, Xi''an Jiatong-Liverpool University, Suzhou 215123, Peoples Republic of China;5. Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;6. Waikato Radiocarbon Dating Laboratory, University of Waikato, Private Bag 3240, Hamilton, New Zealand;1. School of Geography, Planning and Environmental Management, The University of Queensland, St Lucia, Brisbane, 4072 Queensland, Australia;2. Geography, Environment and Population, University of Adelaide, Adelaide, 5005 South Australia, Australia;1. Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close BS8 1TS, UK;2. Cabot Institute, University of Bristol, Cantock’s Close, Bristol BS8 1UJ, UK;3. Polish Geological Institute, ul. Rakowiecka 4, 00-975 Warszawa, Poland;4. School of Earth Sciences, University of Bristol, BS8 1RJ, UK;5. Department of Biology, Bath Spa University, Newton Park, Newton St Loe BA2 9BN, UK;6. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, 710069 Xi’an, China;7. Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Kraków, ul. Senacka 1, 31-002 Kraków, Poland;1. Centre for Tropical Environmental and Sustainability Science, College of Science, Technology and Engineering, James Cook University, P.O. Box 6811, Cairns, Australia;2. Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Australia;3. Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan |
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| Abstract: | Steryl alkyl ethers (SAEs) have been reported from marine sediments ranging from Holocene to Lower Cretaceous and their production has been linked to upwelling of cold, nutrient-rich water. However, the lack of continuous stratigraphic records for them has complicated validation of the precise connection of their production, sedimentary distribution and survival to climatic conditions. Here, we report an SAE record that spans the last ca. 135 ka from a core taken offshore southeastern Australia in the Murray Canyons Group region. The SAEs are composed predominantly of C27–C30 steroid moieties with one or two double bonds, ether-bound to C10–C11 alkyl moieties. Some of the SAEs are identical to those reported in marine sediments, whereas others have not been identified previously. They do not exhibit any systematic change in distribution over the past 110 ka but sediments older than 110 ka possess a different assemblage, with a higher amount of constituents containing a C11 alkyl moiety. The SAE accumulation rate increases rapidly during glacial episodes and for intervals characterized by a sharp decline in sea-surface temperature. The results suggest that SAEs may be related to marine eukaryotes that thrive when there is an influx of cold, deep waters in the Murray Canyons Group region, likely triggered by stronger westerlies over southeastern Australia forcing deeper water to reach the surface during glacials. |
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