气候变化领域集成服务门户(CCPortal): Eocene deformation of the NE Tibetan Plateau: Indications from magnetostratigraphic constraints on the oldest sedimentary sequence in the Linxia Basin

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DOI	10.1016/j.gr.2021.07.027
	Eocene deformation of the NE Tibetan Plateau: Indications from magnetostratigraphic constraints on the oldest sedimentary sequence in the Linxia Basin
	Feng, Zhantao; Zhang, Weilin; Fang, Xiaomin; Zan, Jinbo; Zhang, Tao; Song, Chunhui; Yan, Maodu
通讯作者	Zhang, WL (通讯作者)
发表日期	2022
ISSN	1342-937X
EISSN	1878-0571
起始页码	77
结束页码	93
卷号	101
英文摘要	The process and mechanism of deformation in the northeastern Tibetan Plateau (NETP) are significant for understanding the remote effects of the India-Eurasia collision. Although increasingly more research has extensively addressed the post-Oligocene NETP growth history over the past two decades, geological dating of early Cenozoic sediments remains sparse, hampering our understanding of early-stage tectonic growth in this region. Here, we present magnetostratigraphic results from the oldest sedimentary record between -54 and 40 Ma in the western part of the Linxia Basin based on correlation with the geomagnetic polarity time scale. This age exceeds that of the oldest strata previously known (29 Ma) and has great potential for recording paleoclimatic and paleontological evolution in the fossil-rich Linxia Basin. Integrating our paleomagnetic chronology, sedimentary facies, accumulation rate, and provenance results reveals that early-stage Linxia Basin development was associated with Eocene growth of the West Qinling. The U-Pb age distributions of detrital grains from pre-51 Ma strata are characterized by many 200-300 Ma ages; alluvial fans and north-directed paleocurrent data indicate a single and relatively proximal source. The northern segment of the West Qinling was the predominant source supplying sediments to the Linxia Basin before -51 Ma. Subsequently, a pronounced increase in the sedimentation rate at -51 Ma and southward migration of the sedimentary system during 51-47.8 Ma demonstrate that extension and fast exhumation of the sediment source occurred. Detrital zircon U-Pb age spectra since -51 Ma reveal significant increases in Precambrian peaks (1500-2000 Ma and 2300-2600 Ma). These observations suggest accelerated growth of the southern segment of the West Qinling and/or eastern segment of the East Kunlun Shan between 51 and 47.8 Ma. The Eocene basin evolution and accelerated uplift of ranges in the NETP imply near-synchronicity of crustal shortening and deformation across the entire India-Eurasia collision zone. (c) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	CENOZOIC TECTONIC EVOLUTION U-PB AGES XINING BASIN NORTHEASTERN TIBET NW CHINA ISOTOPE EVIDENCE FORELAND BASIN QAIDAM BASIN GUIDE BASIN NORTH CHINA
英文关键词	Northeastern Tibetan Plateau; Linxia Basin; West Qinling; Magnetostratigraphy; Provenance
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000702866800007
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/260567
推荐引用方式 GB/T 7714	Feng, Zhantao,Zhang, Weilin,Fang, Xiaomin,et al. Eocene deformation of the NE Tibetan Plateau: Indications from magnetostratigraphic constraints on the oldest sedimentary sequence in the Linxia Basin[J]. 中国科学院青藏高原研究所,2022,101.
APA	Feng, Zhantao.,Zhang, Weilin.,Fang, Xiaomin.,Zan, Jinbo.,Zhang, Tao.,...&Yan, Maodu.(2022).Eocene deformation of the NE Tibetan Plateau: Indications from magnetostratigraphic constraints on the oldest sedimentary sequence in the Linxia Basin.GONDWANA RESEARCH,101.
MLA	Feng, Zhantao,et al."Eocene deformation of the NE Tibetan Plateau: Indications from magnetostratigraphic constraints on the oldest sedimentary sequence in the Linxia Basin".GONDWANA RESEARCH 101(2022).