Nd and Sr isotopic compositions of sediments from the Yellow and Yangtze Rivers: Implications for partitioning tectonic terranes and crust weathering of the Central and Southeast China |
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Authors: | Xianwei MENG Yanguang LIU Xuefa SHI Dewen DU |
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Institution: | (1) First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China;(2) Key Laboratory of Marine Sedimentology and Environment Geology, State Oceanic Administration, Qingdao, 266061, China |
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Abstract: | New Nd and Sr isotope data are presented in this paper for sediments from the Yellow and Yangtze River drainage basins. The
average 143Nd/144Nd isotope compositions of fine-grained sediments from two drainage basins seem similar. The T
DMNd ages of sediments from the two drainage basins are relatively uniform but exhibit subtle differences. This reflects the different
underlying bedrocks, in association with the unique tectonic terranes that comprise central and southeastern China, including
the North China Block, the Yangtze Block, the South China Block, the Tibet Plateau and the Qinling-Dabie Orogenic Belt. In
contrast, there is an obvious difference in the 87Sr/86Sr ratios between fine-grained sediments of the Yellow and Yangtze Rivers, which actually reflects an increase in chemical
weathering intensity from northwestern to southeastern China. |
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Keywords: | Nd and Sr isotopes Yellow and Yangtze Rivers tectonic terranes crust weathering |
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