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| Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources | |
| 作者单位： | YANG ShouYe（State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China） ; JIANG ShaoYong（State Key Laboratory for Mineral Deposit Research, Nanjing University, Nanjing 210093, China） ; LING HongFei（State Key Laboratory for Mineral Deposit Research, Nanjing University, Nanjing 210093, China） ; XIA XiaoPing（Departmen of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China） ; SUN Min（Departmen of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China） ; WANG DeJie（Development Research Center, China Geological Survey, Beijing 100083, China） ; |
| 基金项目： | 国家自然科学基金;上海市青年科技启明星计划 |
| 摘 要： | The suspended particulate and fine-grained floodplain sediments were collected from the main stream and tributaries of the Changjiang River for Sr-Nd isotopic measurements. The εNd(0) values gradually decrease downstream from -10.8 on average in the upper reaches to -12.3 in the lower reaches, whereas the 87Sr/86Sr ratios increase correspondingly, averaging 0.721899 and 0.725826 respectively in the upper and middle-lower reaches. The compositional variations primarily reflect the complex con- trols of provenance rocks, chemical weathering, and sediment characters between different catchments, among which the abnormal Sr-Nd isotopic compositions of the Yalong, Fujiang, Tuojiang and Yuanjiang rivers indicate the sediment provenance contributions from the Emeishan Basalt in the upper reaches and the old metamorphic and siliceous rocks in the middle-lower reaches. The Sr-Nd isotopic ratios of the Changjiang sediments can better reflect the average composition of weathered continental crust compared to other major rivers in the world because of the unique source rock types in the Changjiang drainage basin. The recognition of the Sr-Nd isotopic systematics of the Changjiang sediments will contribute to our understanding of the Changjiang evolution history and continental weathering processes during the Cenozoic, and also to reconstructing the paleoenvironmental changes in East China and the marginal seas. |
| 收稿时间： | 23 May 2006 |
| 修稿时间： | 30 January 2007 |
Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources |
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| Authors: | Yang ShouYe Jiang ShaoYong Ling HongFei Xia XiaoPing Sun Min Wang DeJie |
| Institution: | 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China 2. State Key Laboratory for Mineral Deposit Research, Nanjing University, Nanjing 210093, China 3. Departmen of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China 4. Development Research Center, China Geological Survey, Beijing 100083, China |
| Abstract: | The suspended particulate and fine-grained floodplain sediments were collected from the main stream and tributaries of the Changjiang River for Sr-Nd isotopic measurements. The ε Nd(0) values gradually decrease downstream from −10.8 on average in the upper reaches to −12.3 in the lower reaches, whereas the 87Sr/86Sr ratios increase correspondingly, averaging 0.721899 and 0.725826 respectively in the upper and middle-lower reaches. The compositional variations primarily reflect the complex controls of provenance rocks, chemical weathering, and sediment characters between different catchments, among which the abnormal Sr-Nd isotopic compositions of the Yalong, Fujiang, Tuojiang and Yuanjiang rivers indicate the sediment provenance contributions from the Emeishan Basalt in the upper reaches and the old metamorphic and siliceous rocks in the middle-lower reaches. The Sr-Nd isotopic ratios of the Changjiang sediments can better reflect the average composition of weathered continental crust compared to other major rivers in the world because of the unique source rock types in the Changjiang drainage basin. The recognition of the Sr-Nd isotopic systematics of the Changjiang sediments will contribute to our understanding of the Changjiang evolution history and continental weathering processes during the Cenozoic, and also to reconstructing the paleoenvironmental changes in East China and the marginal seas. Supported by the National Natural Science Foundation of China (Grant No. 40476029) and Shanghai Rising-Star Program (Grant No. 04QMX1430) |
| Keywords: | Sr-Nd isotopes sediment Changjiang River source rock provenance |
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