气候变化领域集成服务门户(CCPortal): The Tectonic “Umbilical Cord” Linking India and Sri Lanka and the Tale of their Failed Rift

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DOI	10.1029/2019JB018225
	The Tectonic “Umbilical Cord” Linking India and Sri Lanka and the Tale of their Failed Rift
	Ratheesh-Kumar R.T.; Dharmapriya P.L.; Windley B.F.; Xiao W.J.; Jeevan U.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Geophysical studies of the tectonic links between Sri Lanka and India are limited, and consequent paleo-fit configurations differ and remain uncertain. Here, we present first-order constraints for an optimum link between Sri Lanka and southern India by using high-resolution maps of elastic thickness (Te) and crustal thickness (Tc) derived from a flexure inversion method that based on the space-domain convolution technique for a data window covering integral continental-oceanic lithospheric setting. We find that the spatial variations of Te and Tc over different crustal provinces in southern India and Sri Lanka agree well with their tectonic classifications proposed by geological studies. Importantly, this study provides much-needed confirmation of the rifting and associated lithospheric deformation along the mirrored continental margins of India and Sri Lanka and in the intervening transitional lithosphere. The two margins are marked by patterns of low Te and thinned crust, which suggests that an anticlockwise rift (eastward rift) of Sri Lanka away from India resulted in the creation of the Mannar Basin, and a secondary N-S rifting gave rise to the Cauvery Basin. However, these developments led to a final failed rift, which we attribute to a mechanically strong continental lithospheric bond (a NW-SE zone of high-Te and relatively thick crust) that was present in the intervening Palk Strait. We matched the identical zones of Te variations along the two mirrored continental margins and thus obtained a coherent paleo-fit configuration, and a step-by-step evolution of these margins was constructed by using magnetic anomaly-based paleo-fit reconstruction models. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	continental margin; effective elastic thickness; gravity anomaly; isostasy; lithosphere; Moho
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187838
作者单位	Department of Marine Geology and Geophysics, School of Marine Sciences, Cochin University of Science and Technology, Kochi, India; Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY, United States; Department of Geology, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka; Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka; Department of Geology, The University of Leicester, Leicester, United Kingdom; Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China; Department of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China; Department of Atmospheric Sciences, School of Marine Sciences, Cochin University of Science and Technology, Kochi, India
推荐引用方式 GB/T 7714	Ratheesh-Kumar R.T.,Dharmapriya P.L.,Windley B.F.,等. The Tectonic “Umbilical Cord” Linking India and Sri Lanka and the Tale of their Failed Rift[J],2020,125(5).
APA	Ratheesh-Kumar R.T.,Dharmapriya P.L.,Windley B.F.,Xiao W.J.,&Jeevan U..(2020).The Tectonic “Umbilical Cord” Linking India and Sri Lanka and the Tale of their Failed Rift.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Ratheesh-Kumar R.T.,et al."The Tectonic “Umbilical Cord” Linking India and Sri Lanka and the Tale of their Failed Rift".Journal of Geophysical Research: Solid Earth 125.5(2020).