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  4. 岩石圈演化国家重点实验室
Eocene granulite-facies metamorphism prior to deformation of the Mianhuadi mafic complex in the Ailao Shan-Red River shear zone, Yunnan Province, SW China

文献类型：期刊论文

作者Liu, Ping-Ping1,2,3; Zhou, Mei-Fu1; Zhao, Guochun1; Chung, Sun-Lin2,4; Chen, Wei Terry5; Wang, Fei3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2017-09-01
卷号145页码:626-640
关键词Mianhuadi mafic complex Granulite Ductile deformation Ar-Ar dating ASRR shear zone
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.06.019
文献子类Article
英文摘要The Mianhuadi mafic complex in the Ailao Shan-Red River (ASRR) shear zone, SW China, consists of granulite and mylonite, formed by granulite-facies peak metamorphism and retrograde amphibolite-facies metamorphism, with later local mylonitic deformation. Textures and mineral relics indicate that the protolith, represented by the mineral assemblage (M-0) of olivine, clinopyroxene, plagioclase and Fe-Ti oxides, was emplaced as a mafic intrusion in the Late Permian as part of the Emeishan large igneous province. Two kinds of metamorphic mineral assemblages were identified: the peak assemblage (M-1) of garnet + orthopyroxene + clinopyroxene + plagioclase + magnetite + ilmenite, and the retrograde assemblage (M-2) composed of hornblende surrounding orthopyroxene and garnet, and hornblende + spinel symplectite around garnet. Pressure-temperature estimates yield 657-722 degrees C and 7-9 kbar, and 649-676 degrees C and 5-6 kbar for the M-1 and M-2 stages, respectively, roughly defining a clockwise P-T path with near-isothermal decompression following the peak metamorphism. These metamorphic conditions are quite unlike those (pressure up to 14 kbar) of the Late Permian-Middle Triassic metamorphic event in the region. In addition, foliated biotite from mylonites has an Ar-40-Ar-39 plateau age of 34.3 +/- 0.4 Ma, indicating that the ASRR shear zone was active at or before the Late Eocene. Combined with previous data, our new results indicate that the granulite-facies metamorphism of the Mianhuadi mafic complex occurred most likely during the Eocene, followed by rapid exhumation and ductile sinistral shearing in the Late Eocene. The formation of the granulite was likely related to the upwelling of the asthenosphere due to the delamination of overthickened lithospheric mantle after the India-Asia collision.
WOS关键词SOUTHEASTERN TIBETAN PLATEAU ; EMEISHAN FLOOD BASALTS ; FE-MG GEOTHERMOMETER ; LEFT-LATERAL SHEAR ; ZIRCON U-PB ; CONTINENTAL EXTRUSION ; INDO-CHINA ; SE ASIA ; EMPIRICAL CALIBRATION ; TECTONIC IMPLICATIONS
WOS研究方向Geology
语种英语
WOS记录号WOS:000411533600022
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Science Foundation of China(41325006 ; National Science Foundation of China(41325006 ; China Postdoctoral Science Foundation(2015M570145) ; China Postdoctoral Science Foundation(2015M570145) ; HKU ; HKU ; 41503010) ; 41503010) ; National Science Foundation of China(41325006 ; National Science Foundation of China(41325006 ; China Postdoctoral Science Foundation(2015M570145) ; China Postdoctoral Science Foundation(2015M570145) ; HKU ; HKU ; 41503010) ; 41503010) ; National Science Foundation of China(41325006 ; National Science Foundation of China(41325006 ; China Postdoctoral Science Foundation(2015M570145) ; China Postdoctoral Science Foundation(2015M570145) ; HKU ; HKU ; 41503010) ; 41503010) ; National Science Foundation of China(41325006 ; National Science Foundation of China(41325006 ; China Postdoctoral Science Foundation(2015M570145) ; China Postdoctoral Science Foundation(2015M570145) ; HKU ; HKU ; 41503010) ; 41503010)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61947]  
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Liu, Ping-Ping
作者单位1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
2.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Natl Taiwan Univ, Dept Geosci, Taipei, Taiwan
5.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Guizhou, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Ping-Ping,Zhou, Mei-Fu,Zhao, Guochun,et al. Eocene granulite-facies metamorphism prior to deformation of the Mianhuadi mafic complex in the Ailao Shan-Red River shear zone, Yunnan Province, SW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,145:626-640.
APA Liu, Ping-Ping,Zhou, Mei-Fu,Zhao, Guochun,Chung, Sun-Lin,Chen, Wei Terry,&Wang, Fei.(2017).Eocene granulite-facies metamorphism prior to deformation of the Mianhuadi mafic complex in the Ailao Shan-Red River shear zone, Yunnan Province, SW China.JOURNAL OF ASIAN EARTH SCIENCES,145,626-640.
MLA Liu, Ping-Ping,et al."Eocene granulite-facies metamorphism prior to deformation of the Mianhuadi mafic complex in the Ailao Shan-Red River shear zone, Yunnan Province, SW China".JOURNAL OF ASIAN EARTH SCIENCES 145(2017):626-640.

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来源：地质与地球物理研究所

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