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

被引：24
|
作者：
Mao ChangPing [1 ]
Chen Jun [1 ]
Yuan XuYin [2 ]
Yang ZhongFang [3 ]
Ji JunFeng [1 ]
机构：
[1] Nanjing Univ, Inst Surficial Geochem, Sch Earth Sci & Engn, Nanjing 210093, Peoples R China
[2] Hohai Univ, Coll Environm Sci & Engn, Nanjing 210098, Peoples R China
[3] China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
来源：
CHINESE SCIENCE BULLETIN | 2011年 / 56卷 / 22期
基金：
中国国家自然科学基金;
关键词：
Changjiang River; suspended particulate matter; Sr-Nd isotopic compositions; seasonality; provenance; SOUTH CHINA SEA; YANGTZE-RIVER; SEDIMENT TRANSPORT; WATER; SYSTEMATICS; EVOLUTION; HIMALAYA; DISCHARGE; PATTERNS; HISTORY;
D O I：
10.1007/s11434-011-4589-6
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
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 Sr-87/Sr-86 ratios of the samples ranges from 0.725352 to 0.738128, and the values of E > (Nd)(0) ranges from -10.55 to -12.29. The Sr-Nd isotopic compositions show distinct seasonal variations. The samples had lower Sr-87/Sr-86 ratios and higher E > (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 Sr-87/Sr-86 ratios and the increase in E > (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 Sr-87/Sr-86 and E > (Nd)(0) of the samples were 0.728254 and -11.26, respectively.
引用
收藏
页码：2371 / 2378
页数：8
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