气候变化领域集成服务门户(CCPortal): Grain-size analysis of Upper Pliocene red clay deposits from Linxia Basin: Implications for Asian monsoon evolution on the NE margin of the Tibetan Plateau

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DOI	10.1016/j.palaeo.2018.09.027
	Grain-size analysis of Upper Pliocene red clay deposits from Linxia Basin: Implications for Asian monsoon evolution on the NE margin of the Tibetan Plateau
	Zan, Jinbo; Li, Xiaojing; Fang, Xiaomin; Zhang, Weilin; Yan, Maodu; Mao, Ziqiang
通讯作者	Zan, JB (通讯作者)
发表日期	2018
ISSN	0031-0182
EISSN	1872-616X
起始页码	597
结束页码	605
卷号	511
英文摘要	Little is known about the evolution of the East Asian winter monsoon (EAWM) on the NE margin of the Tibetan Plateau (TP) during the late Pliocene-early Pleistocene, due to the poor exposure of pre-Quaternary eolian deposits and ambiguities in the interpretation of paleoclimatic proxies. In this study, we performed detailed grain size analyses of eolian sequences (spanning 3.7-2.4 Ma) from two new boreholes in Linxia Basin, in the NE TP. We compared our results with contemporaneous loess-red clay sequences across the Chinese Loess Plateau (CLP) and identified a substantial decrease in the thickness and grain size of upper Pliocene-lower Pleistocene loess and red clay sediments from the western to central parts of the CLP. This observation supports the view that the grain size of upper Pliocene eolian sequences from Linxia Basin can be used to reconstruct the evolution of the EAWM. In addition, it demonstrates that the modern spatial pattern of the EAWM regime in the western CLP has been maintained since at least the late Pliocene. Records of both median grain-size (Md) and sand content from the boreholes exhibit an overall upward-increasing trend during the interval from similar to 3.7-2.4 Ma, indicating a longterm stepwise intensification of the EAWM and aridity on the NE margin of the TP. In addition, a dramatic coarsening of the grain size in loess unit L34 documents a large climatic shift at similar to 2.75 Ma, which may be closely linked with the major intensification of Northern Hemisphere glaciation during the late Pliocene.
关键词	CHINESE LOESS PLATEAU NORTHERN CHINA RECORDS MA DELTA-O-18 TIMESCALE SEQUENCES UPLIFT
英文关键词	Plio-Pleistocene transition; Chinese Loess Plateau; East Asian winter monsoon; Loess; Eolian deposits; Median grain-size
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000452583600040
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259134
推荐引用方式 GB/T 7714	Zan, Jinbo,Li, Xiaojing,Fang, Xiaomin,et al. Grain-size analysis of Upper Pliocene red clay deposits from Linxia Basin: Implications for Asian monsoon evolution on the NE margin of the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,511.
APA	Zan, Jinbo,Li, Xiaojing,Fang, Xiaomin,Zhang, Weilin,Yan, Maodu,&Mao, Ziqiang.(2018).Grain-size analysis of Upper Pliocene red clay deposits from Linxia Basin: Implications for Asian monsoon evolution on the NE margin of the Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,511.
MLA	Zan, Jinbo,et al."Grain-size analysis of Upper Pliocene red clay deposits from Linxia Basin: Implications for Asian monsoon evolution on the NE margin of the Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 511(2018).