气候变化领域集成服务门户(CCPortal): Deep Crustal Contact Between the Pamir and Tarim Basin Deduced From Receiver Functions

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DOI	10.1029/2021GL093271
	Deep Crustal Contact Between the Pamir and Tarim Basin Deduced From Receiver Functions
	Xu, Qiang; Zhao, Junmeng; Yuan, Xiaohui; Liu, Hongbing; Ju, Changhui; Schurr, Bernd; Bloch, Wasja
通讯作者	Xu, Q ; Zhao, JM (通讯作者)
发表日期	2021
ISSN	0094-8276
EISSN	1944-8007
卷号	48 期号:9
英文摘要	The deep crustal deformation in the east Pamir in response to the Cenozoic collision with the Tien Shan and the Tarim Basin is so far poorly constrained. We present new insights into the crustal structure of the east Pamir and its surrounding regions using P receiver functions from 40 temporary and permanent seismic stations. The crustal thickness reaches a maximum of 88 km beneath the central and southern east Pamir and decreases sharply to 50-60 km along the southern Tien Shan and to 41-50 km below the Tarim Basin. The most prominent crustal structures involve a double Moho, suggesting eastward underthrusting of the Pamir lower crust beneath southern east Pamir, and two Moho offsets, supporting delamination of Asian lower crust below the central east Pamir and pure shear shortening along the northeastern margin between the Pamir and Tarim Basin. Plain Language Summary The Pamir orogen is located at the leading edge of the Indo-Asian collision zone and has translated northward by about 300 km with respect to the Himalaya-Tibetan plateau since the Late Cenozoic. It protruded the formerly connected Tajik and Tarim basins and formed a curviplanar front with the Tajik Basin to the west, Tien Shan to the north, and Tarim Basin to the east. Previous studies revealed that the Pamir is underthrusted by the Asian crust from the west and the north; however, it is still unclear how the contact between Pamir and the Tarim basin crust looks like. This study elucidates the deep crustal interaction between the two tectonic blocks by receiver functions with data from a recent seismic experiment in the region. The Pamir crust is extended into the western tip of the Tarim basin and is thickened by horizontal shortening, while in the south it is underthrusting beneath the West Kunlun Shan and Tarim Basin into the mantle to a depth of >100 km. Key Points The Asian lower crust is delaminated beneath the central east Pamir The northeast Pamir crust extends into the Tarim Basin and thickens by pure shear shortening The southeast Pamir crust is underthrusting beneath West Kunlun Shan and Tarim Basin
关键词	HINDU-KUSH CONTINENTAL-CRUST SUBDUCTION EVOLUTION BENEATH TIBET ZONE
英文关键词	crustal structure; continental crust underthrusting; delamination; east Pamir; receiver functions; Tarim Basin
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000675524000072
来源期刊	GEOPHYSICAL RESEARCH LETTERS
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/260162
推荐引用方式 GB/T 7714	Xu, Qiang,Zhao, Junmeng,Yuan, Xiaohui,et al. Deep Crustal Contact Between the Pamir and Tarim Basin Deduced From Receiver Functions[J]. 中国科学院青藏高原研究所,2021,48(9).
APA	Xu, Qiang.,Zhao, Junmeng.,Yuan, Xiaohui.,Liu, Hongbing.,Ju, Changhui.,...&Bloch, Wasja.(2021).Deep Crustal Contact Between the Pamir and Tarim Basin Deduced From Receiver Functions.GEOPHYSICAL RESEARCH LETTERS,48(9).
MLA	Xu, Qiang,et al."Deep Crustal Contact Between the Pamir and Tarim Basin Deduced From Receiver Functions".GEOPHYSICAL RESEARCH LETTERS 48.9(2021).