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Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau
Ye, CC (Ye, Chengcheng)1,2; Yang, YB (Yang, Yibo)1,3,4; Fang, XM (Fang, Xiaomin)1,2,3,4; Hong, HL (Hong, Hanlie)5; Wang, CW (Wang, Chaowen)6; Yang, RS (Yang, Rongsheng)1,2; Zhang, WL (Zhang, Weilin)1,3,4
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
2018-12-26
Volume512Issue:特刊 SIPages:23-32
DOI10.1016/j.palaeo.2018.03.014
Abstract

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.

Subject Area地质学
WOS IDWOS:000454973500003
Language英语
Indexed BySCIE
KeywordQaidam Basin Global Climate Middle Eocene Red-clay Evolution Mineralogy Boundary Records China Crystallinity
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
Cooperation Status国内
ISSN0031-0182
Department大陆碰撞与高原隆升重点实验室
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8467
Collection图书馆
Corresponding AuthorYang, YB (Yang, Yibo); Fang, XM (Fang, Xiaomin)
Affiliation1.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
4.Chinese Acad Sci, Beijing 100101, Peoples R China;
5.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Hubei, Peoples R China;
6.China Univ Geosci, Gemmol Inst, Wuhan 430074, Hubei, Peoples R China.
Recommended Citation
GB/T 7714
Ye, CC ,Yang, YB ,Fang, XM ,et al. Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2018,512(特刊 SI):23-32.
APA Ye, CC .,Yang, YB .,Fang, XM .,Hong, HL .,Wang, CW .,...&Zhang, WL .(2018).Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,512(特刊 SI),23-32.
MLA Ye, CC ,et al."Chlorite chemical composition change in response to the Eocene-Oligocene climate transition on the northeastern Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 512.特刊 SI(2018):23-32.
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