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Paleogene crustal extension in the eastern segment of the NE Tibetan plateau
Fan, LG (Fan, Long-Gang)1,2,3; Meng, QR (Meng, Qing-Ren)1,2,3; Wu, GL (Wu, Guo-Li)1,2,3; Wei, HH (Wei, Hong-Hong)4; Du, ZM (Du, Zhong-Ming)1,2; Wang, EC (Wang, Erchie)1,2
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
2019
Volume514Issue:0Pages:62-74
DOI10.1016/j.epsl.2019.02.036
Abstract

The Tibetan plateau experienced lateral growth in response to the India-Eurasia collision, but uncertainties remain about when and how its present-day margins were formed. It was commonly viewed that crustal shortening in the NE Tibetan plateau had commenced since the Eocene and led to reverse faulting and compressional basins. Our recent investigations of some Cenozoic intermontane basins reveal that synsedimentary normal faults occur widely in the eastern segment of the NE Tibetan plateau. Normal faulting at basin bases obviously controlled basin sedimentation and presumably resulted in footwall uplift and basement exhumation. Small-scale synsedimentary normal faults are very common in basin fill sequences although they decrease in intensity upwards and eventually vanish in the uppermost Paleogene sequences. Measurement of the attitudes of synsedimentary normal faults indicates that crustal stretching was in NW-SE direction. The NW-SE extension was consistent with Paleogene stress field of the whole North China craton, which were thought responsible for the NE-SW-trending rift basins in the interior of the North China craton, such as the Yinchuan, Weihe, and Bohai Bay rift basin systems. A broad unconformity separates Paleogene and Neogene sequences in the eastern segment of the NE Tibetan plateau, contrasting strikingly with conformable Oligocene to Middle Miocene sequences in the neighboring Ningnan and Yinchuan rift basins. It thus follows that the eastern segment of the NE Tibetan plateau had not been formed in Paleogene when it was basically dictated by crustal extension, possibly as a result of far-field effect of subduction of the western Pacific plate. End-Oligocene termination of normal faulting and the presence of a regional unconformity indicate that the eastern segment of the NE Tibetan plateau began rising at the beginning of the Miocene. (C) 2019 Elsevier B.V. All rights reserved.

Subject AreaGeosciences
WOS IDWOS:000466054900006
Language英语
Indexed BySCI
KeywordCenozoic Tectonic Evolution Altyn-tagh Fault Qilian Shan Northeastern Margin Qaidam Basin Nw China Continental Deformation Cooling History Yinchuan Basin Lanzhou Basin
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
ISSN0012-821X
Department大陆碰撞与高原隆升
URL查看原文
PublisherELSEVIER
SubtypeArticle
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9301
Collection图书馆
Corresponding AuthorMeng, QR (Meng, Qing-Ren)
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China;
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
4.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China.
Recommended Citation
GB/T 7714
Fan, LG ,Meng, QR ,Wu, GL ,et al. Paleogene crustal extension in the eastern segment of the NE Tibetan plateau[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,514(0):62-74.
APA Fan, LG ,Meng, QR ,Wu, GL ,Wei, HH ,Du, ZM ,&Wang, EC .(2019).Paleogene crustal extension in the eastern segment of the NE Tibetan plateau.EARTH AND PLANETARY SCIENCE LETTERS,514(0),62-74.
MLA Fan, LG ,et al."Paleogene crustal extension in the eastern segment of the NE Tibetan plateau".EARTH AND PLANETARY SCIENCE LETTERS 514.0(2019):62-74.
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