干旱区生态环境知识资源中心(Arid): Provenances of the Oldest Xiashu loess and Xuancheng loess in southern China: Implications for dust transport and dust proxies of the East Asian winter monsoon

Arid

DOI	10.1016/j.palaeo.2023.111440
	Provenances of the Oldest Xiashu loess and Xuancheng loess in southern China: Implications for dust transport and dust proxies of the East Asian winter monsoon
	Wu, Chao; Zheng, Xiangmin; Qian, Peng; Qu, Pan; He, Miaohong; Wei, Gangjian
通讯作者	Wu, C ; Wei, GJ
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2023
卷号	614
英文摘要	The loess-paleosol sequences of southern China are valuable paleoclimatic archives since the Middle Pleistocene, on the regional and global scales. Knowledge of loess provenance can shed light on dust transport and the development of paleoclimatic proxies for loess deposits. However, there is a research gap regarding the prove-nance of the Oldest (similar to 0.9 Ma) Xiashu loess near the Yangtze River valley. The precise source area of the Xuancheng loess in southern China remains to be unidentified. In this study, we used elemental geochemistry and detrital zircon U-Pb ages to identify the sources of the Oldest Xiashu loess and Xuancheng loess in southern China. The Oldest Xiashu loess is dominantly derived from Yangtze River sediments, and part of its fine-grained dust component originates from the arid regions of Central Asia or northern China. The elemental compositions of the size-fractionated silicates and detrital zircon U-Pb ages of the Xuancheng loess are like those of the Shuiyang River sediments in the Xuancheng region. These results demonstrate that the Xuancheng loess is mainly the product of local dust activity in the Xuancheng regions, and thus that the Xiashu and Xuancheng loess are the products of independent dust transport processes. This spatial differentiation of loess provenance may be a widespread phenomenon in southern China, and consequently, the grain size compositions of the various loess sections in southern China cannot be used to recover paleo-wind directions on a regional scale. Overall, our study shows that when the grain size compositions from the southern China loess are used to reconstruct East Asian winter monsoon intensity, the signals from local wind fields should first be removed.
英文关键词	Xiashu loess Xuancheng loess ZirconU-Pb age Elemental geochemistry Provenance
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000990796800001
WOS关键词	EARTH-ELEMENT COMPOSITIONS ; GRAIN-SIZE DISTRIBUTION ; YANGTZE-RIVER DELTA ; U-PB GEOCHRONOLOGY ; ISOTOPIC COMPOSITIONS ; GEOCHEMICAL EVIDENCE ; CHANGJIANG YANGTZE ; MATANUSKA VALLEY ; LATE PLEISTOCENE ; TIBETAN PLATEAU
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397955
推荐引用方式 GB/T 7714	Wu, Chao,Zheng, Xiangmin,Qian, Peng,et al. Provenances of the Oldest Xiashu loess and Xuancheng loess in southern China: Implications for dust transport and dust proxies of the East Asian winter monsoon[J],2023,614.
APA	Wu, Chao,Zheng, Xiangmin,Qian, Peng,Qu, Pan,He, Miaohong,&Wei, Gangjian.(2023).Provenances of the Oldest Xiashu loess and Xuancheng loess in southern China: Implications for dust transport and dust proxies of the East Asian winter monsoon.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,614.
MLA	Wu, Chao,et al."Provenances of the Oldest Xiashu loess and Xuancheng loess in southern China: Implications for dust transport and dust proxies of the East Asian winter monsoon".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 614(2023).