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Polystage deformation of the Gaoligong metamorphic zone: Structures, Ar-40/Ar-39 mica ages, and tectonic implications

文献类型：期刊论文

作者Zhang, Bo1; Zhang, Jinjiang1; Zhong, Dalai2; Yang, Liekun2; Yue, Yahui3; Yan, Shuyu1
刊名JOURNAL OF STRUCTURAL GEOLOGY
出版日期2012-04-01
卷号37页码:1-18
关键词Structure CPOs Polystage deformation Ar-40/Ar-39 Gaoligong metamorphic zone
ISSN号0191-8141
DOI10.1016/j.jsg.2012.02.007
文献子类Article
英文摘要The Gaoligong metamorphic zone is located southeast of the Eastern Himalayan Syntaxis in western Yunnan, China. The zone is characterized by four stages of deformation (D1-D4). D1 structures record early compressive deformation during the Indosinian orogeny, which formed tight to isoclinal F1 folds of bedding with a penetrative S1 foliation developed parallel to fold axial planes. Mid-crustal horizontal shearing during D2 resulted in overprinting of D1 structures. D1 and 02 structures are associated with granulite facies metamorphism. D3 doming resulted in late crustal thickening and the development of a regional NW-SE trending F3 antiform. Synchronous with or slightly subsequent to 03 deformation, the zone experienced D4 ductile strike-slip shearing, resulting in its exhumation to shallow crustal levels and retrograde metamorphism. Granitic D4 mylonites predominantly yield Ar-40/Ar-39 mica ages of 15-16 Ma, indicating that D4 dextral strike-slip shearing occurred in the Miocene. Weakly deformed leucogranite and protomylonite yield Ar-40/Ar-39 ages of 10-11 Ma, suggesting that ductile strike-slip shearing continued to the Late Miocene. The new Ar-40/Ar-39 data indicate that escape-related deformation along the Gaoligong strike-slip shear zone occurred in the Miocene. In association with recent geophysical studies, and on the basis of the structural, crystal preferred orientation (CPO), and geochronological data presented in this paper, we suggest that the Gaoligong metamorphic zone formed in response to intracontinental transpression in the southeast of Tibet, characterized as intense deformation and metamorphism at middle-upper crustal levels. (C) 2012 Elsevier Ltd. All rights reserved.
WOS关键词RIVER SHEAR ZONE ; LOWER CRUSTAL FLOW ; WESTERN YUNNAN ; INDO-CHINA ; SE ASIA ; DYNAMIC RECRYSTALLIZATION ; PREFERRED ORIENTATIONS ; AILAO SHAN ; FABRIC DEVELOPMENT ; SOUTHWEST CHINA
WOS研究方向Geology
语种英语
WOS记录号WOS:000302758600001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China for Young Scientists(40802050 ; National Natural Science Foundation of China for Young Scientists(40802050 ; China Postdoctoral Science Foundation(20070420065) ; China Postdoctoral Science Foundation(20070420065) ; 40872149) ; 40872149) ; National Natural Science Foundation of China for Young Scientists(40802050 ; National Natural Science Foundation of China for Young Scientists(40802050 ; China Postdoctoral Science Foundation(20070420065) ; China Postdoctoral Science Foundation(20070420065) ; 40872149) ; 40872149) ; National Natural Science Foundation of China for Young Scientists(40802050 ; National Natural Science Foundation of China for Young Scientists(40802050 ; China Postdoctoral Science Foundation(20070420065) ; China Postdoctoral Science Foundation(20070420065) ; 40872149) ; 40872149) ; National Natural Science Foundation of China for Young Scientists(40802050 ; National Natural Science Foundation of China for Young Scientists(40802050 ; China Postdoctoral Science Foundation(20070420065) ; China Postdoctoral Science Foundation(20070420065) ; 40872149) ; 40872149)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84302]  
专题中国科学院地质与地球物理研究所
通讯作者Zhang, Bo
作者单位1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Bo,Zhang, Jinjiang,Zhong, Dalai,et al. Polystage deformation of the Gaoligong metamorphic zone: Structures, Ar-40/Ar-39 mica ages, and tectonic implications[J]. JOURNAL OF STRUCTURAL GEOLOGY,2012,37:1-18.
APA Zhang, Bo,Zhang, Jinjiang,Zhong, Dalai,Yang, Liekun,Yue, Yahui,&Yan, Shuyu.(2012).Polystage deformation of the Gaoligong metamorphic zone: Structures, Ar-40/Ar-39 mica ages, and tectonic implications.JOURNAL OF STRUCTURAL GEOLOGY,37,1-18.
MLA Zhang, Bo,et al."Polystage deformation of the Gaoligong metamorphic zone: Structures, Ar-40/Ar-39 mica ages, and tectonic implications".JOURNAL OF STRUCTURAL GEOLOGY 37(2012):1-18.

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来源：地质与地球物理研究所

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