气候变化领域集成服务门户(CCPortal): Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses

CCPortal

DOI	10.1029/2020GL087531
	Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses
	Li S.; van Hinsbergen D.J.J.; Shen Z.; Najman Y.; Deng C.; Zhu R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:8
英文摘要	The Tibetan Plateau accommodated major upper crustal shortening during Indian Plate oceanic and continental lithosphere subduction. Deciphering whether shortening was continuous or episodic, and how it correlates to major geodynamic changes is challenging. Here we apply anisotropy of magnetic susceptibility (AMS), a sensitive synsedimentary strain indicator, to a ~3 km thick magnetostratigraphically dated sedimentary section (69–41.5 Ma) in eastern Tibet. AMS shows “earliest deformation” fabrics from 69–52 Ma, followed by a sudden change to “pencil structure” fabrics with increasing anisotropy degree at ~52 Ma, dating a sudden increased synsedimentary shortening strain. This change coincides with enhanced sedimentation rates and synsedimentary vertical-axis rotations of the Gonjo Basin, suggesting a causal link to a marked India-Asia convergence rate deceleration. We show that AMS analysis provides a strong tool to distinguish between climatic and tectonic causes of sedimentological change and is an asset in identifying discrete tectonic pulses in intensely deformed terrane. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Geodynamics; Lithology; Magnetic susceptibility; Structural geology; Tectonics; Anisotropy of magnetic susceptibility; Continental lithosphere; Convergence rates; Crustal shortening; Sedimentation rates; Strain indicators; Tibetan Plateau; Vertical-axis rotation; Magnetic anisotropy; continental lithosphere; crustal deformation; crustal shortening; geodynamics; Indian plate; lithosphere; magnetic anisotropy; magnetic susceptibility; magnetostratigraphy; sedimentation; subduction; synsedimentary tectonics; China; Gonjo Basin; Qinghai-Xizang Plateau; Xizang
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170436
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Institutions of Earth Science, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Li S.,van Hinsbergen D.J.J.,Shen Z.,et al. Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses[J],2020,47(8).
APA	Li S.,van Hinsbergen D.J.J.,Shen Z.,Najman Y.,Deng C.,&Zhu R..(2020).Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses.Geophysical Research Letters,47(8).
MLA	Li S.,et al."Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses".Geophysical Research Letters 47.8(2020).