OSL and sediment accumulation rate models: Understanding the history of sediment deposition |
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| Institution: | 1. CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Function Laboratory of Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;1. Kasumigaura Environmental Science Center, 1854 Okijyuku, Tsuchiura, Ibaraki 3000023, Japan;2. Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 3058572, Japan;3. Laboratory for Ecological Reconstruction Science Co. Ltd., 5-80 Aioicho, Naka-ku, Yokohama, Kanagawa 2310012, Japan;4. Institute for Environmental Informatics, IDEA Consultants, Ins., 2-2-2 Hayabuchi, Tsuzuki-ku, Yokohama, Kanagawa 2240025, Japan;5. Ibaraki Prefecture, 978-6 Kasahara-cho, Mito, Ibaraki 3108555, Japan;6. Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 3058577, Japan |
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| Abstract: | Coastal deposits are very dynamic systems that may not have constant sediment accumulation rates over time. High-resolution reconstruction and dating of coastal environments, e.g. timing of vertical accretion of dune and/or beach ridges, can be achieved when collection of samples is closely-spaced, although this method is not always economically viable or time-effective. The low terrestrial dose rate environment leads to an unusual situation in which sample ages depend on the rate of accumulation of the overburden. By mathematically coupling successive sample ages obtained from vertical sediment cores, we are able to provide constraints on the model accumulation profiles. The dependence of sample age on the accumulation model is presented, and sample ages are compared with leading accumulation models of dune and beach ridge formation. |
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