气候变化领域集成服务门户(CCPortal): Balanced Cross-Sections and Numerical Modeling of the Lithospheric-Scale Evolution of the Hindu Kush and Pamir

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DOI	10.1029/2020JB020678
	Balanced Cross-Sections and Numerical Modeling of the Lithospheric-Scale Evolution of the Hindu Kush and Pamir
	Kelly S.; Beaumont C.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The role of deformation and removal of continental lithospheric mantle (CLM) during continent-continent collision, while recognized as fundamental to the evolution of orogenic systems, often remains speculative as direct evidence for these processes is typically absent. Nevertheless, these poorly understood deep lithospheric processes are expected to produce first-order controls on the style of crustal shortening, magmatism, and metamorphism in large-scale orogens. The Hindu Kush and Pamir offer an excellent opportunity to constrain these deep processes, as high-quality seismic images reveal oppositely dipping slabs under the Hindu Kush and Pamir, inferred to be subducting Indian and Asian lithospheres, respectively. Using two-dimensional mantle-scale geodynamical models, we show that these along-strike differences can be explained by the nature of the indenting Indian plate; thinner fringe Indian crust beneath the Hindu Kush, and full-thickness Indian crust beneath the Pamir. In the Hindu Kush models, steep subduction of India follows early delamination of the Asian lithospheric mantle, whereas in the Pamir models, Asian delamination is followed by flat-slab underthrusting of Indian CLM and forced subduction of northern Asian terranes. These styles of mantle delamination and subduction have key implications for the ensuing styles of magmatism, metamorphism, and crustal-scale evolution of these systems. In the Hindu Kush, subduction of fringe India leads to burial of Indian crust under Asia, limiting both Himalayan growth and deformation of the Tajik Basin. In contrast, in the Pamir, forced subduction of the Alai terrane leads to Alai crust underthrusting the Pamir, forming the Pamir orocline. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	continental lithospheric mantle; Hindu Kush; intercontinental subduction; mantle delamination; Pamir; tectonics
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/187287
作者单位	Department of Earth and Environmental Science, Dalhousie University, Halifax, NS, Canada; Oceanography Department, Dalhousie University, Halifax, NS, Canada
推荐引用方式 GB/T 7714	Kelly S.,Beaumont C.. Balanced Cross-Sections and Numerical Modeling of the Lithospheric-Scale Evolution of the Hindu Kush and Pamir[J],2021,126(3).
APA	Kelly S.,&Beaumont C..(2021).Balanced Cross-Sections and Numerical Modeling of the Lithospheric-Scale Evolution of the Hindu Kush and Pamir.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Kelly S.,et al."Balanced Cross-Sections and Numerical Modeling of the Lithospheric-Scale Evolution of the Hindu Kush and Pamir".Journal of Geophysical Research: Solid Earth 126.3(2021).