气候变化领域集成服务门户(CCPortal): Paleolake salinity evolution in the Qaidam Basin (NE Tibetan Plateau) between similar to 42 and 29 Ma: Links to global cooling and Paratethys sea incursions

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DOI	10.1016/j.sedgeo.2020.105778
	Paleolake salinity evolution in the Qaidam Basin (NE Tibetan Plateau) between similar to 42 and 29 Ma: Links to global cooling and Paratethys sea incursions
	Ye, Chengcheng; Yang, Yibo; Fang, Xiaomin; Zhang, Weilin; Song, Chunhui; Yang, Rongsheng
通讯作者	Yang, YB ; Fang, XM (通讯作者)
发表日期	2020
ISSN	0037-0738
EISSN	1879-0968
卷号	409
英文摘要	Climate change in the Asian interior during the early Cenozoic remains poorly constrained due to difficulties in distinguishing the impacts of global cooling, the early uplift of the Tibetan Plateau and the retreat of the Paratethys. A quantitative estimation of paleolake salinity enables a better understanding of the regional hydrological cycle and contemporaneous climate change. Here, we present a quantitative record of paleolake salinity in the Qaidam Basin between similar to 42 and 29 Ma using detailed mineralogical investigations and clay boron content data. This paleolake salinity record generally covers a tectonically less active period in the Asian interior characterized by continuous global cooling, the abrupt Eocene-Oligocene climate transition and the Paratethys transgression/regression cycles, thus offering an opportunity to explore the roles of global cooling and the Paratethys retreat in regulating the regional hydrological cycle. The results of two boron-derived paleosalimeters, equivalent boron and Couch's salinity, collectively indicate a two-stage paleolake salinity evolution, from an oligohaline-mesohaline environment in the middle-late Eocene (similar to 42-similar to 34 Ma) to a mesosaline environment in the early Oligocene (similar to 34-similar to 29 Ma). This transition is also supported by qualitative chloride-based and ostracod-based paleosalinity estimates in the Qaidam Basin. Our quantitative paleolake reconstruction between similar to 42 and 29 Ma in the Qaidam Basin yields a generally good match with the hydrodimate change in the neighboring Xining Basin, thus indicating a comparable regional drying trend. The synchronous changes in quantitative paleolake salinity and silicate weathering processes derived from the illite weathering index and chlorite content in the studied section suggest climate control of silicate weathering. Global cooling is speculated to have been the first-order driving factor in regulating long-term climatic evolution and weathering responses in the Asian interior between similar to 42 and 29 Ma. Superimposed on this trend, the Paratethys transgression/regression cycles served as an important factor regulating wet/dry fluctuations in the Asian interior between similar to 42 and similar to 34 Ma. (C) 2020 Elsevier B.V. All rights reserved.
关键词	CENOZOIC TECTONIC EVOLUTION ASIAN SUMMER MONSOON PALEOENVIRONMENTAL CHANGES REGIONAL TECTONICS MARGINAL MARINE TRACE-ELEMENTS XINING BASIN TARIM BASIN NW CHINA CLIMATE
英文关键词	Paleosalinity; Clay minerals; Global cooling; Paratethys retreat; Qaidam Basin
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000591250700004
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/259780
推荐引用方式 GB/T 7714	Ye, Chengcheng,Yang, Yibo,Fang, Xiaomin,et al. Paleolake salinity evolution in the Qaidam Basin (NE Tibetan Plateau) between similar to 42 and 29 Ma: Links to global cooling and Paratethys sea incursions[J]. 中国科学院青藏高原研究所,2020,409.
APA	Ye, Chengcheng,Yang, Yibo,Fang, Xiaomin,Zhang, Weilin,Song, Chunhui,&Yang, Rongsheng.(2020).Paleolake salinity evolution in the Qaidam Basin (NE Tibetan Plateau) between similar to 42 and 29 Ma: Links to global cooling and Paratethys sea incursions.SEDIMENTARY GEOLOGY,409.
MLA	Ye, Chengcheng,et al."Paleolake salinity evolution in the Qaidam Basin (NE Tibetan Plateau) between similar to 42 and 29 Ma: Links to global cooling and Paratethys sea incursions".SEDIMENTARY GEOLOGY 409(2020).