Seasonal variations in the Sr-Nd isotopic compositions of suspended particulate matter in the lower Changjiang River:Provenance and erosion constraints

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作者：
MAO ChangPing CHEN Jun YUAN XuYin YANG ZhongFang JI JunFeng Institute of Surficial GeochemistrySchool of Earth Sciences and EngineeringNanjing UniversityNanjing China College of Environmental Science and EngineeringHohai UniversityNanjing China School of Earth Science and ResourcesChina University of GeosciencesBeijingBeijing China [1 ,1 ,2 ,3 ,1 ,1 ,210093 ,2 ,210098 ,3 ,100083 ]
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Chinese Science Bulletin | 2011年 / 56卷 / 22期
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P597 [同位素地质学与地质年代学];
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摘要：
Suspended particulate matter samples were collected monthly for more than 2 years in Nanjing,China to examine seasonal changes in the Sr-Nd isotopic compositions of the lower Changjiang River(CR).The results indicate that the 87Sr/86Sr ratios of the samples ranges from 0.725352 to 0.738128,and the values ofεNd(0)ranges from-10.55 to-12.29.The Sr-Nd isotopic compositions show distinct seasonal variations.The samples had lower 87Sr/86Sr ratios and higherε Nd(0)values during the flood season than the dry seasons.The seasonal variations primarily reflect the controls of provenance rocks and erosion in different sub-catchments.The relative decrease in 87Sr/86Sr ratios and the increase inε Nd(0)values during the flood season may reflect an increasing in the mechanical erosion rate in the upper basin and the contribution of more sediment from the upper reaches.The end member values of 87Sr/86Sr andε Nd(0)of the samples were 0.728254 and?11.26,respectively.
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页码：2371 / 2378
页数：8
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