Mesozoic Crustal Thickening of the Longmenshan Belt (NE Tibet, China) by Imbrication of Basement Slices: Insights From Structural Analysis, Petrofabric and Magnetic Fabric Studies, and Gravity Modeling

doi:10.1002/2017TC004754

	Mesozoic Crustal Thickening of the Longmenshan Belt (NE Tibet, China) by Imbrication of Basement Slices: Insights From Structural Analysis, Petrofabric and Magnetic Fabric Studies, and Gravity Modeling
	Xue, Zhenhua 1,2,3; Martelet, Guillaume 4; Lin, Wei 1; Faure, Michel 3; Chen, Yan 3; Wei, Wei1 ; Li, Shuangjian 5; Wang, Qingchen 1
刊名	TECTONICS
	2017-12-01
卷号	36 期号:12 页码:3110-3134
关键词	Longmenshan Thrust Belt Thick-skinned Structure Tibetan Plateau Intracontinental Deformation
ISSN号	0278-7407
DOI	10.1002/2017TC004754
文献子类	Article
英文摘要	This work first presents field structural analysis, anisotropy of magnetic susceptibility (AMS) measurements, and kinematic and microstructural studies on the Neoproterozoic Pengguan complex located in the middle segment of the Longmenshan thrust belt (LMTB), NE Tibet. These investigations indicate that the Pengguan complex is a heterogeneous unit with a ductilely deformed NW domain and an undeformed SE domain, rather than a single homogeneous body as previously thought. The NW part of the Pengguan complex is constrained by top-to-the-NW shearing along its NW boundary and top-to-the-SE shearing along its SE boundary, where it imbricates and overrides the SE domain. Two orogen-perpendicular gravity models not only support the imbricated shape of the Pengguan complex but also reveal an imbrication of high-density material hidden below the Paleozoic rocks on the west of the LMTB. Regionally, this suggests a basement-slice-imbricated structure that developed along the margin of the Yangtze Block, as shown by the regional gravity anomaly map, together with the published nearby seismic profile and the distribution of orogen-parallel Neoproterozoic complexes. Integrating the previously published ages of the NW normal faulting and of the SE directed thrusting, the locally fast exhumation rate, and the lithological characteristics of the sediments in the LMTB front, we interpret the basement-slice-imbricated structure as the result of southeastward thrusting of the basement slices during the Late Jurassic-Early Cretaceous. This architecture makes a significant contribution to the crustal thickening of the LMTB during the Mesozoic, and therefore, the Cenozoic thickening of the Longmenshan belt might be less important than often suggested.
WOS关键词	GARZE FOLD BELT ; ANNAPURNA-DHAULAGIRI HIMALAYA ; SOUTHERN QUEBEC APPALACHIANS ; QINGYANG-JIUHUA MASSIF ; EASTERN MARGIN ; SICHUAN BASIN ; OROGENIC BELT ; WESTERN CHINA ; MAGMATIC ARC ; SUSCEPTIBILITY ANISOTROPY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000423417300018
资助机构	MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 41225009) ; 41225009) ; 41225009) ; 41225009) ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 41225009) ; 41225009) ; 41225009) ; 41225009) ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 41225009) ; 41225009) ; 41225009) ; 41225009) ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; MOST project of China(2016YFC0600401 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; NSFC(41472193 ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 2016YFC0600102) ; 41225009) ; 41225009) ; 41225009) ; 41225009)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82618]
专题	中国科学院地质与地球物理研究所
通讯作者	Lin, Wei
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China 3.Univ Orleans, Inst Sci Terre Orleans, CNRS, UMR 7327,INSU, Orleans, France 4.Bur Rech Geol & Miniere, UMR 7327, Orleans, France 5.China Petr & Chem Corp, Inst Petr Explorat & Dev, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Xue, Zhenhua,Martelet, Guillaume,Lin, Wei,et al. Mesozoic Crustal Thickening of the Longmenshan Belt (NE Tibet, China) by Imbrication of Basement Slices: Insights From Structural Analysis, Petrofabric and Magnetic Fabric Studies, and Gravity Modeling[J]. TECTONICS,2017,36(12):3110-3134.
APA	Xue, Zhenhua.,Martelet, Guillaume.,Lin, Wei.,Faure, Michel.,Chen, Yan.,...&Wang, Qingchen.(2017).Mesozoic Crustal Thickening of the Longmenshan Belt (NE Tibet, China) by Imbrication of Basement Slices: Insights From Structural Analysis, Petrofabric and Magnetic Fabric Studies, and Gravity Modeling.TECTONICS,36(12),3110-3134.
MLA	Xue, Zhenhua,et al."Mesozoic Crustal Thickening of the Longmenshan Belt (NE Tibet, China) by Imbrication of Basement Slices: Insights From Structural Analysis, Petrofabric and Magnetic Fabric Studies, and Gravity Modeling".TECTONICS 36.12(2017):3110-3134.