三峡巫山黄土Sr-Nd同位素组成与物源示踪

张玉芬; 李长安; 李启文; 贾明明; 李亚伟

doi:10.3799/dqkx.2019.072

Volume 45 Issue 3

Mar. 2020

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Article Navigation > Earth Science > 2020 > 45(3): 960-967

Zhang Yufen, Li Chang'an, Li Qiwen, Jia Mingming, Li Yawei, 2020. Sr-Nd Isotopic Composition and Provenance Tracing of Wushan Loess, Three Gorges, Yangtze River. Earth Science, 45(3): 960-967. doi: 10.3799/dqkx.2019.072

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Zhang Yufen, Li Chang'an, Li Qiwen, Jia Mingming, Li Yawei, 2020. Sr-Nd Isotopic Composition and Provenance Tracing of Wushan Loess, Three Gorges, Yangtze River. Earth Science, 45(3): 960-967. doi: 10.3799/dqkx.2019.072

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

doi: 10.3799/dqkx.2019.072

1.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences, Wuhan 430074, China

Received Date: 2019-03-03
Publish Date: 2020-03-15

Abstract

Abstract

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 ε_Nd(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 ε_Nd(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.
- Wushan Loess,
- Sr-Nd isotopic,
- Loess Plateau,
- provenance tracing,
- geochemistry

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References(56)

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

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