Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources

查看全文 作　　者：YANG ShouYe1?, JIANG ShaoYong2, LING HongFei2, XIA XiaoPing3, SUN Min3 & WANG DeJie4 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

出　　处：《Science China Earth Sciences》索引2007年第50卷第10期,共10页

基　　金：National Natural Science Foundation of China (Grant No. 40476029); Shanghai Rising-Star Program (Grant No. 04QMX1430) 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. 关键词：SR-ND isotopes, sediment, CHANGJIANG River, source rock, PROVENANCE

相关文献

参考文献（58）
引证文献（36）
耦合文献（925）

参考文献(58)

引证文献(36)

耦合文献(925)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources

参考文献(58)

引证文献(36)

耦合文献(925)

用户提示