Uranium isotopic constraints on the provenance of dust on the Chinese Loess Plateau

doi:10.1130/G45130.1

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	Uranium isotopic constraints on the provenance of dust on the Chinese Loess Plateau
	Li, Le; Chen, Jun; Chen, Yang; Hedding, David William; Li, Tao; Li, Laifeng; Liu, Xiangjun; Zeng, Fangming; Wu, Weihua; Zhao, Liang; Li, Gaojun
第一作者	Li, Le
	2018-09
发表期刊	GEOLOGY
ISSN	0091-7613
卷号	46 期号:9 页码:747-750
摘要	Provenance of the silt on the Chinese Loess Plateau (CLP) is essential for the paleo-environmental interpretation of the thick eolian deposits, but is highly debated. The controversy mainly comes from the multi-interpretation of similar geochemical signatures of potential source areas (PSAs). This work applies the (U-234/U-238) activity ratio as a new source tracer, because it can distinguish particles with different transporting and recycling histories regardless of petrological origin. The (U-234/U-238) activity ratio of a fine particle decreases progressively after its production because of the increasing fraction of the U-234 precursor ejected out of the particle surface, due to the recoiling effect associated with the a decay of U-238. Distinct spatial patterns of (U-234/U-238) can be found for the sediments in PSAs and the loess on the CLP. When combined with other constraints, the new findings indicate that the CLP loess can be best explained by the mixing of three end-member dust sources on the northwestern transportation trajectory, namely (1) the Gobi Desert, (2) the Ordos Desert, and (3) the Qilian Mountains. A contribution from the Yellow River is also possible but may not be significant. The identified source partition implies that the eolian silt is mainly produced by processes in the 'High Asia' mountains and, partly, by erosion of the exposed clastic rocks. This new constraint on the production and transportation of eolian dust has great implications for the proxy interpretation of loess related to atmospheric circulation, dust accumulation rate, and chemical indexes.
DOI	10.1130/G45130.1
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34418
专题	盐湖地质与环境实验室
推荐引用方式 GB/T 7714	Li, Le,Chen, Jun,Chen, Yang,et al. Uranium isotopic constraints on the provenance of dust on the Chinese Loess Plateau[J]. GEOLOGY,2018,46(9):747-750.
APA	Li, Le.,Chen, Jun.,Chen, Yang.,Hedding, David William.,Li, Tao.,...&Li, Gaojun.(2018).Uranium isotopic constraints on the provenance of dust on the Chinese Loess Plateau.GEOLOGY,46(9),747-750.
MLA	Li, Le,et al."Uranium isotopic constraints on the provenance of dust on the Chinese Loess Plateau".GEOLOGY 46.9(2018):747-750.

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