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Enhanced aridification across the Eocene/Oligocene transition evidenced by geochemical record in the Tajik Basin, Central Asia

文献类型：期刊论文

作者Sun, Jimin1,2; Liu, Weiguo1,4; Guo, Zhengtang1,2; Qi, Liang1,5; Zhang, Zhiliang3
刊名GLOBAL AND PLANETARY CHANGE
出版日期2022-04-01
卷号211页码:12
关键词Late Paleogene Tajik Basin Land-sea change Stable isotope Paleoenvironment
ISSN号0921-8181
DOI10.1016/j.gloplacha.2022.103789
英文摘要The Tajik Basin is an intermontane depression between the mountain ranges of Tian Shan, Pamir, and Hindukush, which is located in the northwestern part of the India-Asia collision zone. Due to the westward retreat of the Neotethys Sea, the paleoenvironment of the Tajik Basin has underwent change from a shallow-sea to a continental semiarid land during the Cenozoic era. This implies that the long-term climatic record in the Tajik Basin can potentially reflect the environmental effects of the changed land-sea distributions controlled by plate collision and global eustatic sea-level changes. In this paper, we present new results of stable oxygen and carbon isotopes of carbonates and chemical weathering indices of bulk samples from the Eocene-Oligocene terrestrial strata (ca. 39-30 Ma) in the center of the Tajik Basin. The temporal variations of oxygen and carbon isotopes of carbonates indicate an isotopic shift across the Eocene-Oligocene transition (-34 Ma), characterized by a relatively positive shift due to the isotopic enrichment in authigenic carbonates in an enhanced aridification episode in the Tajik Basin. This shift was also mirrored by the weakened chemical weathering indicated by the ratios of major oxides across the Eocene-Oligocene transition. Such a regional climatic shift was generally coincident with a remarkable global scale sea-level drop. We suggest that the isolated Paratethys Sea, which was mainly driven by global cooling due to the initial formation of the Antarctica Ice-sheet, together with the decreased seawater evaporation due to lower sea surface temperature, reduced water vapor transport by westerlies to the downwind region, and thus intensified the aridification in the Tajik Basin began at -34 Ma.
WOS关键词EOCENE-OLIGOCENE TRANSITION ; CHEMICAL-WEATHERING INDEXES ; DISSOLVED INORGANIC CARBON ; TIBETAN PLATEAU ; TARIM BASIN ; CLIMATE-CHANGE ; XINING BASIN ; PARATETHYS ; EVOLUTION ; ROCKS
资助项目National Natural Science Foundation of China[41888101] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20070202]
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:000794227800001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/105973]  
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Sun, Jimin
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
3.China Earthquake Adm, Inst Geol, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China
5.Chinese Acad Sci, Inst Geochem, Guiyang 550081, Peoples R China
推荐引用方式
GB/T 7714		 Sun, Jimin,Liu, Weiguo,Guo, Zhengtang,et al. Enhanced aridification across the Eocene/Oligocene transition evidenced by geochemical record in the Tajik Basin, Central Asia[J]. GLOBAL AND PLANETARY CHANGE,2022,211:12.
APA Sun, Jimin,Liu, Weiguo,Guo, Zhengtang,Qi, Liang,&Zhang, Zhiliang.(2022).Enhanced aridification across the Eocene/Oligocene transition evidenced by geochemical record in the Tajik Basin, Central Asia.GLOBAL AND PLANETARY CHANGE,211,12.
MLA Sun, Jimin,et al."Enhanced aridification across the Eocene/Oligocene transition evidenced by geochemical record in the Tajik Basin, Central Asia".GLOBAL AND PLANETARY CHANGE 211(2022):12.

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来源：地质与地球物理研究所

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