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An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau

文献类型：期刊论文

作者Xue, Zhenhua1,4,5; Lin, Wei2,5; Chu, Yang2,5; Faure, Michel1; Chen, Yan1; Ji, Wenbin3; Qiu, Huaning6
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2022
卷号134期号:1-2页码:15-38
ISSN号0016-7606
DOI10.1130/B35826.1
英文摘要The Longmenshan Thrust Belt in Eastern Tibet resulted from a Mesozoic orogeny and Cenozoic reworking. It is generally believed that the Cenozoic tectonics along the Longmenshan Thrust Belt are mostly inherited from the Mesozoic. Reconstructing the Mesozoic tectonics of the Longmenshan Thrust Belt is therefore important for understanding its evolutionary history. On the basis of detailed structural analysis, we recognized a Main Central Boundary that divides the Longmenshan Thrust Belt into a Southeastern Zone and a Northwestern Zone. Both zones underwent a main D-1 event characterized by D-1E top-to-the-SE thrusting in the Southeastern Zone and D-1w top-to-the-NW/N thrusting in the Northwestern Zone. In the Southeastern Zone, a D-2 top-to-the-NW/N normal faulting that cuts the D-1E structures is developed along the NW boundary of the basement complexes. Newly obtained and previous geochronological data indicate that the D-1E and D-1w events occurred synchronously at ca. 224-219 Ma, and the D2 top-to-the-NW/N normal faulting was episodically activated at ca. 166-160 Ma, 141-120 Ma, 81-47 Ma, and 27-25 Ma. Episodic and synchronously activated top-to-the-NW normal faulting and top-to-the-SE thrusting along the northwestern and southeastern boundaries of the basement complexes, respectively, leads us to propose that the basement slices were episodically imbricated to the SE during the Late Jurassic-Early Cretaceous and Late Cretaceous-earliest Paleocene. The D-1w amphibolite facies metamorphic rocks above the basement complexes recorded fast exhumation during the Late Jurassic-Early Cretaceous. We propose that the early Mesozoic northwestward basement underthrusting along a crustal "weak zone" was responsible for the D-1w double-vergent thrusting and amphibolite facies metamorphism. Subsequent basement-slice imbrications reworked the Longmenshan Thrust Belt and exhumed the amphibolite facies rocks. Our results highlight the importance of basement underthrusting and imbrication in the formation and reworking of the intracontinental Longmenshan Thrust Belt in Eastern Tibet.
WOS关键词GARZE FOLD BELT ; SONGPAN-GARZE ; SOUTH CHINA ; U-PB ; SICHUAN BASIN ; GEOCHRONOLOGICAL CONSTRAINTS ; TECTONOTHERMAL EVOLUTION ; TRIASSIC GRANITOIDS ; STRUCTURAL-ANALYSIS ; TECTONIC EVOLUTION
资助项目National Nature Science Foundation of China[91855212] ; National Nature Science Foundation of China[91755205] ; National Nature Science Foundation of China[41802219] ; National Key R&D Program of China[2016YFC0600401] ; National Key R&D Program of China[2016YFC0600102] ; French LABEX VOLTAIRE[ANR-10-LABX-100-01] ; EQUIPEX PLANET[ANR-11-EQPX-0036]
WOS研究方向Geology
语种英语
出版者GEOLOGICAL SOC AMER, INC
WOS记录号WOS:000740437800002
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; French LABEX VOLTAIRE ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET ; EQUIPEX PLANET
源URL[http://ir.iggcas.ac.cn/handle/132A11/103971]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Lin, Wei
作者单位1.Univ Orleans, ISTO, BRGM, CNRS,UMR 7327, F-45071 Orleans, France
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Northwest Univ, Dept Geol, Xian 710069, Peoples R China
4.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.China Univ Geosci, Minist Educ, Key Lab Tecton & Petr Resources, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Xue, Zhenhua,Lin, Wei,Chu, Yang,et al. An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2022,134(1-2):15-38.
APA Xue, Zhenhua.,Lin, Wei.,Chu, Yang.,Faure, Michel.,Chen, Yan.,...&Qiu, Huaning.(2022).An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,134(1-2),15-38.
MLA Xue, Zhenhua,et al."An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 134.1-2(2022):15-38.

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来源：地质与地球物理研究所

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