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DOI	10.1016/j.palaeo.2018.03.014
	Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau
	Ye, Chengcheng; Yang, Yibo; Fang, Xiaomin; Hong, Hanlie; Wang, Chaowen; Yang, Rongsheng; Zhang, Weilin
通讯作者	Yang, YB ; Fang, XM (通讯作者)
发表日期	2018
ISSN	0031-0182
EISSN	1872-616X
起始页码	23
结束页码	32
卷号	512
英文摘要	The Eocene-Oligocene climate transition (EOCT) at similar to 34 Ma is a pronounced environmental reorganization that occurred in the Cenozoic era and has been extensively studied via marine archives. However, to date, there is still a less well-dated continental record across the EOCT, which can mostly be attributed to a lack of suitable proxies used in the varied continental settings in terms of sedimentary facies, provenance and climate, thus resulting in a poor understanding of the continental response to this transition. Located on the northeastern Tibetan Plateau, the Qaidam Basin is filled with continuous and well-exposed Cenozoic fluvio-lacustrine sediments. Cenozoic lacustrine sediment has been proven to be an ideal archive to study the continental climatic response to the EOCT. Here, we present the detailed mineralogical and elemental composition of chlorite, a widespread clay mineral in continental sediments formed by rock weathering, collected from a lacustrine sequence in the northern Qaidam Basin to constrain the onset of the EOCT and the related climatic response. The results show that chlorite abundance, crystallinity indices, intensity ratios of chlorite diagnostic peaks and chemical composition collectively exhibit remarkable changes at similar to 34.3 Ma. To be more specific, the well crystallized Fe-Mg-rich chlorites were characterized by a high Fe content before the EOCT and turned into high-Mg-content Mg-chlorites with poor crystallinity. The chlorite chemical composition change is assumed to have been related to regional drying after the EOCT, thus providing new insights into the continental paleoenvironmental change based on this novel proxy.
关键词	QAIDAM BASIN GLOBAL CLIMATE MIDDLE EOCENE RED-CLAY EVOLUTION MINERALOGY BOUNDARY RECORDS CHINA CRYSTALLINITY
英文关键词	Clay mineral; Crystallinity; Fe/Mg ratio; Qaidam Basin; Global cooling
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:000454973500003
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/259230
推荐引用方式 GB/T 7714	Ye, Chengcheng,Yang, Yibo,Fang, Xiaomin,et al. Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,512.
APA	Ye, Chengcheng.,Yang, Yibo.,Fang, Xiaomin.,Hong, Hanlie.,Wang, Chaowen.,...&Zhang, Weilin.(2018).Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,512.
MLA	Ye, Chengcheng,et al."Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 512(2018).