Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

doi:10.1016/j.tecto.2014.08.010

	Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling
	Wang, Haiyan 1; Gao, Rui 1; Zeng, Lingsen 2; Kuang, Zhaoyang 3; Xue, Aimin 4; Li, Wenhui 1; Xiong, Xiaosong 1; Huang, Weiyi 3
刊名	TECTONOPHYSICS
	2014
卷号	636 页码:32-39
关键词	Qilian Shan Seismic reflection profiles Lithospheric structure Moho Haiyuan fault Tianjian fault
ISSN号	0040-1951
DOI	10.1016/j.tecto.2014.08.010
英文摘要	Underthrusting of India below Eurasia has resulted in the formation of the Himalayan and the Qinghai-Tibet Plateau. Distributed deformation coupled with block translation and rotation has generated the Qilian Shan thrust belt and a series of east- and northwest-striking strike-slip faults across northeastern Tibet. Because these structures lie in a transition zone between the high plateau region to the south and the lowlands of the North China craton in the north, determining their deep-crustal and upper-mantle structures has important implications for unraveling the mechanism of Tibetan plateau formation. In this paper, we present new results from the SinoProbe-02 deep seismic reflection project across the eastern part of the Qilian Shan and the southern margin of the Alxa block. Interpretation of the reflection profile obtained from this study is based on constraints from surface geology and detailed geometric analysis of structural relationships among key reflectors in the crust and the upper mantle. Our results indicate that the upper crust of the eastern Qilian Shan is characterized by fault-bend folds and duplex systems involving Phanerozoic strata that may have resulted from early Paleozoic collisional tectonics and Cenozoic intra-continental deformation. Locally, half-graben structures hosting Cretaceous strata are also present. The active structures in the region are dominated by left-slip Haiyuan and Tianjian fault systems marking the northern margin of the Tibetan plateau. The strike-slip structures have variable dips and dip directions and sole into a common decollement with a depth of 40-45 km. Because the two faults do not cut and offset the Moho below, the active crustal and mantle deformation in the northeastern Tibet must be decoupled. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	固体地球物理学
WOS关键词	CENOZOIC TECTONIC EVOLUTION ; NORTH QILIAN MOUNTAINS ; DETRITAL-ZIRCON GEOCHRONOLOGY ; QAIDAM BASIN ; AUTONOMOUS REGION ; ARC MAGMATISM ; HAIYUAN FAULT ; NW CHINA ; U-PB ; OROGEN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000345821700003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40556]
专题	中国地质科学院地质研究所
作者单位	1.CAGS, Inst Geol, Lithosphere Res Ctr, Beijing 100037, Peoples R China 2.Minist Land & Resources, Key Lab Earth Probe & Geodynam, Beijing 100037, Peoples R China 3.Minist Land & Resources, Key Lab Continental Dynam, Beijing 100037, Peoples R China 4.Huadong Petr Bur, Geophys Explorat Div, SINOPEC, Nanjing 210007, Jiangsu, Peoples R China 5.Beijing Petrosound Geoserv Ltd, Beijing 100016, Peoples R China
推荐引用方式 GB/T 7714	Wang, Haiyan,Gao, Rui,Zeng, Lingsen,et al. Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling[J]. TECTONOPHYSICS,2014,636:32-39.
APA	Wang, Haiyan.,Gao, Rui.,Zeng, Lingsen.,Kuang, Zhaoyang.,Xue, Aimin.,...&Huang, Weiyi.(2014).Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling.TECTONOPHYSICS,636,32-39.
MLA	Wang, Haiyan,et al."Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling".TECTONOPHYSICS 636(2014):32-39.