Mineralogy,major and trace element geochemistry of riverbed sediments in the headwaters of the Yangtze,Tongtian River and Jinsha River |
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| Authors: | Weihua Wu Shijun Xu Huayu Lu Jiedong Yang Hongwei Yin Wen Liu |
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| Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China;2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;3. Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China;4. Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;5. Department of Geological Sciences, University of Florida, Gainesville, FL 32611-2120, USA;6. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China;7. Laboratory of Marine Microbiology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3. Earth Sciences Department, University of Bristol, Bristol BS8 1RJ, UK;4. School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL, UK;5. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an, 710069, China;1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;2. School of Geography, Nanjing Normal University, Nanjing 210000, China;3. Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113–0033, Japan;4. Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo, Hokkaido 060–0810, Japan;5. State Key Laboratory of Marine Geology, Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | We collected riverbed sediments of the headwaters of the Yangtze River (Chumaer River, Tuotuo River, Gaerqu River and Buqu River), Tongtian River and Jinsha River (HTJR) flowing on the eastern Tibetan Plateau and analyzed their mineralogical features, major and trace element contents. The results show: (i) very poor correlations of Na2O, K2O, CaO, Ba, and Sr to SiO2, LREE to Th, HREE to Hf, and Ta/La to Ti, and characteristics of Eu anomaly (the ratios of (Eu/Eu*)N range from 0.60 to 0.83 with an average value of 0.71) all indicate that the Jinsha River sediments have not undergone much mineralogical sorting; (ii) illite and chlorite are predominant clay minerals, and quartz, calcite, dolomite, albite, and K-feldspar are prevailing non-clay minerals. The characteristics of mineral assemblage indicate relatively weak chemical weathering degree in these river basins; (iii) very high contents of Fe2O3, MgO, TiO2, Sc, V, Cr, Co, and Ni at Panzhihua mainly result from the huge-sized V–Ti magnetite deposits occurred in layered gabbroic intrusion; and (iv) the chemical alteration index (CIA) in the HTJR ranges from 46.5 to 69.2 and with an average value of 60.5 which indicates relatively weak weathering degree. |
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