气候变化领域集成服务门户(CCPortal): Western Tibet relief evolution since the Oligo-Miocene

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DOI	10.1016/j.gr.2014.12.003
	Western Tibet relief evolution since the Oligo-Miocene
	Gourbet, Loraine; Maheo, Gweltaz; Leloup, Philippe Herve; Paquette, Jean-Louis; Sorrel, Philippe; Henriquet, Maxime; Liu, Xiaobing; Liu, Xiaohan
通讯作者	Gourbet, L (通讯作者)
发表日期	2017
ISSN	1342-937X
EISSN	1878-0571
起始页码	425
结束页码	437
卷号	41
英文摘要	Western Tibet, between the Karakorumfault and the Gozha-Longmu Co fault system, is mostly internally drained and has a 1.5-2 km amplitude relief with km-large valleys. We investigate the origin of this peculiar morphology by combining a topography analysis and a study of the Cenozoic sedimentation in this area. Cenozoic continental strata correspond to a proximal, detrital fan deposition, and uncomformably rest on a palaeorelief similar to the modern one. Zircon U-Pb dating from trachytic flows interbedded within the Cenozoic continental sediments indicates that detrital sedimentation occurred at least between ca 24 and 20 Ma in the Shiquanhe basin, while K/Ar ages suggest it may have started since similar to 37 Ma in the Zapug basin. The distribution of continental deposits shows that present-day morphology features, including km-large, 1500 m-deep valleys, were already formed by Early Miocene times. We suggest that today's internally drained western Tibet was externally drained, at least during late Miocene, contemporaneously with early motion along the Karakorum Fault. Detailed study of the present day river network is compatible with a dextral offset on the Karakorum Fault of 250 km at a rate of similar to 10 +/- 1 mm/yr. Displacement along the Karakorum fault possibly induced the shift from external to an internal drainage system, by damming of the Bangong Co similar to 4 Ma ago, leading to the isolation and preservation of the western Tibet relief. (C) 2014 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	KARAKORAM FAULT ZONE SOUTHERN TIBET NW HIMALAYA NORTHWEST HIMALAYA TECTONIC EVOLUTION LUNPOLA BASIN SLIP RATES PLATEAU INDIA PALEOALTIMETRY
英文关键词	Western Tibetan plateau; Continental sedimentation; Geomorphology; River network; Karakorum fault
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000397873300028
来源期刊	GONDWANA RESEARCH
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/259047
推荐引用方式 GB/T 7714	Gourbet, Loraine,Maheo, Gweltaz,Leloup, Philippe Herve,et al. Western Tibet relief evolution since the Oligo-Miocene[J]. 中国科学院青藏高原研究所,2017,41.
APA	Gourbet, Loraine.,Maheo, Gweltaz.,Leloup, Philippe Herve.,Paquette, Jean-Louis.,Sorrel, Philippe.,...&Liu, Xiaohan.(2017).Western Tibet relief evolution since the Oligo-Miocene.GONDWANA RESEARCH,41.
MLA	Gourbet, Loraine,et al."Western Tibet relief evolution since the Oligo-Miocene".GONDWANA RESEARCH 41(2017).