Rare earth element geochemistry of Lake Baikal sediment: its implication for geochemical response to climate change during the Last Glacial/Interglacial transition |
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| Institution: | 1. Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan;2. Department of Earth and Planetary Science, Graduate School of Environmental Studies, Nagoya University, Chikusa, Nagoya 464-8602, Japan;3. Institute for Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan;1. Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. National Centre for Petroleum Research and Development, A.T.B.U, PMB 0248, Bauchi, Nigeria;3. Geology Department, Faculty of Applied Science, Taiz University, 6803 Taiz, Yemen;4. Department of Geology, Ekiti State University, P.M.B. 5363, Ado-Ekiti, Nigeria;1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China;2. Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land Resources, Chengdu 610081, China;3. Chinese Academy of Geological Sceiences, Beijing 100037, China;4. China University of Geosciences, Beijing 100083, China;1. Geological Survey of Canada, Natural Resources Canada, Ottawa, Canada;2. Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada;3. Geological Survey of Canada, Natural Resources Canada, Calgary, Canada;4. Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, Canada;1. Key-Laboratory for Oil Shale and Coexisting Minerals Mineralization & Exploration and Exploitation, Jilin University, Changchun 130061, China;2. Qingdao Institute of Marine Geology, Qingdao 266071, China |
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| Abstract: | Sediments deposited on the bottom of Lake Baikal have contributed to the understanding of a long-term environmental history of continents. Rare earth elements (REEs) along with major elements and loss on ignition (LOI) of Baikal sediments were determined with the aim of evaluating their suitability for a new paleoenvironmental proxy. Our interest is concentrated on paleoenvironmental change during the Last Glacial/Interglacial transition (LGIT). Chondrite-normalized REE patterns for Baikal sediments show a similar variation to those for typical upper continental crustal materials. Three parameters of (La/Yb)n (n: chondrite-normalized value) ratio, ΣREE/TiO2 and Eu anomaly were used to express detailed characteristics of Baikal sediments. Depth profile of (La/Yb)n ratio shows abrupt change, whose timing corresponds to the beginning of climatic warming inferred from the profiles of SiO2/TiO2 and LOI. In addition, (La/Yb)n ratio, ΣREE/TiO2 and the degree of Eu anomaly correlate with each other. This suggests that inflow process of particulate materials into the lake may have changed during the LGIT. The analytical results of this study lead to the conclusion that REE is a useful paleoenvironmental proxy in the Baikal region. |
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