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Eocene granulite-facies metamorphism prior to deformation of the Mianhuadi mafic complex in the Ailao Shan-Red River shear zone, Yunnan Province, SW China
Ping-Ping Liu;  Mei-Fu Zhou;  Guochun Zhao;  Sun-Lin Chung;  Wei Terry Chen;  Fei Wang
2017
Source PublicationJournal of Asian Earth Sciences
Volume145Pages:626-640
Abstract

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.

 

KeywordMianhuadi Mafic Complex Granulite Ductile Deformation Ar-ar Dating Asrr Shear Zone
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8038
Collection矿床地球化学国家重点实验室
Affiliation1.Department of Earth Sciences, University of Hong Kong, Hong Kong
2.Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
3.Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
4.Department of Geosciences, National Taiwan University, Taiwan
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Ping-Ping Liu;Mei-Fu Zhou;Guochun Zhao;Sun-Lin Chung;Wei Terry Chen;Fei Wang. 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 Ping-Ping Liu;Mei-Fu Zhou;Guochun Zhao;Sun-Lin Chung;Wei Terry Chen;Fei Wang.(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 Ping-Ping Liu;Mei-Fu Zhou;Guochun Zhao;Sun-Lin Chung;Wei Terry Chen;Fei Wang."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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