Sr-Nd Isotopic Composition and Provenance Tracing of Wushan Loess, Three Gorges, Yangtze River

被引：0
|
作者：
Zhang Y. [1 ]
Li C. [2 ,3 ]
Li Q. [2 ]
Jia M. [2 ]
Li Y. [2 ]
机构：
[1] Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan
[2] School of Earth Sciences, China University of Geosciences, Wuhan
[3] Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 03期
关键词：
Geochemistry; Loess Plateau; Provenance tracing; Sr-Nd isotopic; Wushan Loess;
D O I：
10.3799/dqkx.2019.072
中图分类号：
学科分类号：
摘要：
As one of the most important elements of the loess in southern China, the provenance of "Wushan Loess" can provide crucial environmental information to deciphering valuable sedimentary record in the area. Based on previous studies, we have collected samples from "Wushan Loess" profile and carried out Sr-Nd isotope analysis, and compared with sediments synchronous to Loess Plateau and fluvial sediments with nearby provenance. The results show that the variation range of 87Sr/86Sr of "Wushan Loess" is 0.717 411-0.719 163 with an average value of 0.717 998, which is almost identical with the 87Sr/86Sr values of Loess Plateau during the last glacial period (variation range is 0.718 235 to 0.719 673, average is 0.718 623).The value of εNd(0) of "Wushan Loess" loess ranges from -10.1 to -11.7 with an average value of -11.4, which is quite different from the value of εNd(0) (-5.9 to -7.2) of modern floodplain sediments in the upper reaches of the Yangtze River, is close to that of Loess Plateau (-9.2 to -11.3). Our research shows that the dust of "Wushan Loess" is mainly imported from the north and is homologous to the loess of Loess Plateau. Therefore, we believe that "Wushan Loess" is not formed by stockpiling dust from the drying up tributaries in Three Gorges area due to the glacial period, which is different from the research result of "Xiashu Loess" in the lower reaches of the Yangtze River in recent years. © 2020, Editorial Department of Earth Science. All right reserved.
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页码：960 / 967
页数：7
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