期刊
CHINESE SCIENCE BULLETIN
卷 57, 期 34, 页码 4482-4490出版社
SCIENCE PRESS
DOI: 10.1007/s11434-012-5311-z
关键词
Yangtze River; suspended sediment; Sr and Nd isotope; stratification
资金
- State Key Program of National Natural Science of China [40830107]
- Key Program for International S&T Cooperation Projects of China [2010DFA24480]
- Geological Survey Program of China
This study examines the effects of hydrologic sorting and mixing of sources on the Sr-Nd isotopic compositions of suspended sediments at different water depths. The samples were collected from three layers (surface, middle and bottom) at Datong hydrological station of Yangtze River during the flood season of 2010. Our results show that, Sr-87/Sr-86 values decrease from surface to bottom, ranging from 0.730332 to 0.720857. E > (Nd)(0) values range from -14.75 to -10.09, with surface sediments being the most negative. The isotope composition at the middle layer can best represent the mean isotopic composition of the total suspended sediments transported by a river. It is believed that the stratification of Sr-Nd isotope is attributable to mixing of sediments from different sources due to hydrological sorting. Sediments from the upper stream are found to be coarser, and tend to contribute more to the lower water column. Although Sr-Nd isotope is a well acknowledged tool to trace sediment provenance, the current study suggests that the grain size of the samples and the sampling locations should be taken into consideration when applying this method to provenance study.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据