气候变化领域集成服务门户(CCPortal): Paleogene crustal extension in the eastern segment of the NE Tibetan plateau

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DOI	10.1016/j.epsl.2019.02.036
	Paleogene crustal extension in the eastern segment of the NE Tibetan plateau
	Fan, Long-Gang; Meng, Qing-Ren; Wu, Guo-Li; Wei, Hong-Hong; Du, Zhong-Ming; Wang, Erchie
通讯作者	Meng, QR (通讯作者)
发表日期	2019
ISSN	0012-821X
EISSN	1385-013X
起始页码	62
结束页码	74
卷号	514
英文摘要	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.
关键词	CENOZOIC TECTONIC EVOLUTION ALTYN-TAGH FAULT QILIAN SHAN NORTHEASTERN MARGIN QAIDAM BASIN NW CHINA CONTINENTAL DEFORMATION COOLING HISTORY YINCHUAN BASIN LANZHOU BASIN
英文关键词	NE Tibetan plateau; Paleogene; extensional basin; normal faulting
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000466054900006
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/259430
推荐引用方式 GB/T 7714	Fan, Long-Gang,Meng, Qing-Ren,Wu, Guo-Li,et al. Paleogene crustal extension in the eastern segment of the NE Tibetan plateau[J]. 中国科学院青藏高原研究所,2019,514.
APA	Fan, Long-Gang,Meng, Qing-Ren,Wu, Guo-Li,Wei, Hong-Hong,Du, Zhong-Ming,&Wang, Erchie.(2019).Paleogene crustal extension in the eastern segment of the NE Tibetan plateau.EARTH AND PLANETARY SCIENCE LETTERS,514.
MLA	Fan, Long-Gang,et al."Paleogene crustal extension in the eastern segment of the NE Tibetan plateau".EARTH AND PLANETARY SCIENCE LETTERS 514(2019).