气候变化领域集成服务门户(CCPortal): Intensified pedogenesis caused the increase in the fine particle content of late Cenozoic fluvial and lacustrine deposits in the NE Tibetan Plateau

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DOI	10.1016/j.sedgeo.2019.105587
	Intensified pedogenesis caused the increase in the fine particle content of late Cenozoic fluvial and lacustrine deposits in the NE Tibetan Plateau
	Zan, Jinbo; Li, Xiaojing; Kang, Jian; Guo, Zengguang; Mao, Ziqiang
通讯作者	Zan, JB (通讯作者)
发表日期	2020
ISSN	0037-0738
EISSN	1879-0968
卷号	398
英文摘要	The grain-size composition of fluvial-lacustrine deposits in terrestrial basins is commonly used to reconstruct temporal variations in sedimentary processes, tectonic activities and paleoclimatic conditions. However, previous studies have generally ignored possible grain-size alteration induced by post-depositional weathering and pedogenesis, which undermines the use of grain-size analysis for reconstructing depositional environments and paleoclimatic changes. In the present study, the grain-size distributions of late Cenozoic fluvial-lacustrine deposits in the Xining Basin (XNB) in the NE Tibetan Plateau (TP) were analyzed. The results demonstrate that the contents of the ultrafine (<1 mu m), clay (<4 mu m) and fine silt (<10 mu m) fractions of bulk siltstone/mudstone samples show an upward-increasing trend, with the depositional environment changing from a shallow lake to a fluvial and finally an alluvial fan environment. Combined with the results of detailed geochemical and rock magnetic analyses of size-fractionated samples, a positive relationship was found between the content of fine-grained sediments and the weathering/pedogenic intensity in the fluvial and lacustrine sedimentary sequences. These results indicate that, under suitable conditions, chemical weathering can significantly affect the grain size composition of fluvial-lacustrine deposits in terrestrial basins. The results are therefore very important for understanding the processes of formation of fine-grained sediments in complex natural environments. (C) 2019 Elsevier B.V. All rights reserved.
关键词	GRAIN-SIZE DISTRIBUTION CHINESE LOESS PLATEAU QUARTZ SILT MAGNETIC-PROPERTIES XINING BASIN SEDIMENTS ORIGIN LAKE MAGNETOSTRATIGRAPHY CONSTRAINTS
英文关键词	Grain size; Chemical weathering; Pedogenesis; Fluvial-lacustrine deposits; Tibetan Plateau
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000526540400007
来源期刊	SEDIMENTARY GEOLOGY
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/259701
推荐引用方式 GB/T 7714	Zan, Jinbo,Li, Xiaojing,Kang, Jian,et al. Intensified pedogenesis caused the increase in the fine particle content of late Cenozoic fluvial and lacustrine deposits in the NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,398.
APA	Zan, Jinbo,Li, Xiaojing,Kang, Jian,Guo, Zengguang,&Mao, Ziqiang.(2020).Intensified pedogenesis caused the increase in the fine particle content of late Cenozoic fluvial and lacustrine deposits in the NE Tibetan Plateau.SEDIMENTARY GEOLOGY,398.
MLA	Zan, Jinbo,et al."Intensified pedogenesis caused the increase in the fine particle content of late Cenozoic fluvial and lacustrine deposits in the NE Tibetan Plateau".SEDIMENTARY GEOLOGY 398(2020).