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  4. 中国科学院新生代地质与环境重点实验室
Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau

文献类型：期刊论文

作者Md Sayem, Abu Sadat1,2,3; Guo, Zhengtang1,2,4; Wu, Haibin1,2; Zhang, Chunxia1,4; Yang, Fan1,2; Xiao, Guoqiao5; He, Zhilin1,2
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2018-09-01
卷号61期号:9页码:1292-1305
关键词Eocene Climate change Sediment color Chemical index of weathering Xining Basin Tibetan Plateau
ISSN号1674-7313
DOI10.1007/s11430-018-9231-9
英文摘要The northeastern Tibetan Plateau began to grow during the Eocene and it is important to understand the climatic history of Asia during this period of so-called 'doubthouse' conditions. However, despite major advances in the last few decades, the evolutionary history and possible mechanisms of Eocene climate change in the northeastern Tibetan Plateau remain unclear. The Xining Basin in the northeastern Tibetan Plateau contains a continuous sequence of Early to Late Eocene non-marine sediments which provides the opportunity to resolve long-term climate changes during this period. In this study, we report the results of analyses of lithofacies, sediment color and geochemistry of bulk samples collected from the Xijigou section of the Xining Basin. An abrupt lithofacies change between the Early (similar to 52-40 Ma) and Late Eocene (similar to 40-34 Ma) indicates a change in the depositional environment from a shallow lake to a playa lake in response to a significant climatic shift. During similar to 52-40 Ma, higher values of sediment redness (a*), redness/lightness (a*/L*) and higher modified Chemical Index of Weathering (CIW') indicate a relatively warm and humid climate, while from similar to 40-34 Ma the lower values of a*, a*/L* and lower CIW' imply sub-humid to semi-arid climatic conditions. The paleoclimatic records indicate a long-term (similar to 52-34 Ma) trend of decreasing chemical weathering, consistent with global climate change. An abrupt sharp excursion of the proxy records during similar to 42-40 Ma suggests a relatively brief warm interval, corresponding to the Middle Eocene Climatic Optimum (MECO). We suggest that global cooling substantially reduced humidity in inner Asia, resulting in sub-humid to semi-arid climatic conditions after 40 Ma in the Xining Basin, which may have been responsible for the long-term trend of decreasing chemical weathering during the Eocene.
WOS关键词EARLY MIOCENE ; CENOZOIC CLIMATE ; MIDDLE EOCENE ; OLIGOCENE TRANSITION ; NORTH-ATLANTIC ; CHINESE LOESS ; QAIDAM BASIN ; MODERN SOILS ; TARIM BASIN ; NW CHINA
资助项目CAS-TWAS ; National Natural Science Foundation of China[41430531] ; National Natural Science Foundation of China[41690114] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26020201] ; International Partnership Program of Chinese Academy of Sciences[131C11KYSB20160061]
WOS研究方向Geology
语种英语
WOS记录号WOS:000442228800010
出版者SCIENCE PRESS
资助机构CAS-TWAS ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; CAS-TWAS ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; CAS-TWAS ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; CAS-TWAS ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/88099]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Guo, Zhengtang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Jahangirnagar Univ, Dept Geol Sci, Dhaka 1342, Bangladesh
4.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
5.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
推荐引用方式
GB/T 7714		 Md Sayem, Abu Sadat,Guo, Zhengtang,Wu, Haibin,et al. Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau[J]. SCIENCE CHINA-EARTH SCIENCES,2018,61(9):1292-1305.
APA Md Sayem, Abu Sadat.,Guo, Zhengtang.,Wu, Haibin.,Zhang, Chunxia.,Yang, Fan.,...&He, Zhilin.(2018).Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau.SCIENCE CHINA-EARTH SCIENCES,61(9),1292-1305.
MLA Md Sayem, Abu Sadat,et al."Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau".SCIENCE CHINA-EARTH SCIENCES 61.9(2018):1292-1305.

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来源：地质与地球物理研究所

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