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P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny
Ding, HX (Ding, Huixia)1; Zhang, ZM (Zhang, Zeming)1,2; Hu, KM (Hu, Kaiming)3; Dong, X (Dong, Xin)1; Xiang, H (Xiang, Hua)1; Mu, HC (Mu, Hongchen)4; Zhang, ZM
Source PublicationTECTONOPHYSICS
2016
Volume683Issue:0Pages:393-404
DOI10.1016/j.tecto.2016.06.035
AbstractMetamorphic P-T-t-D paths have been determined in the Yardoi gneiss dome of the eastern Himalaya that place new constraints on the genesis of the North Himalayan Gneiss Dome and tectonic evolution of the Himalayan orogen. Our study shows that the schists from the Yardoi dome underwent at least three stages of metamorphism and deformation. The first stage of prograde metamorphism is represented by the core of porphyroblastic garnet, showing distinct growth compositional zoning, and hosting mineral inclusions of biotite, muscovite, quartz and ilmenite; the curved inclusion trails define the first stage of deformation foliation (S1). The second stage of peak metamorphism is represented by the rim of porphyroblastic garnet and the aligned matrix minerals of biotite, muscovite, plagioclase, quartz, kyanite and staurolite, which define the main deformation foliation (S2), The third stage of retrograde metamorphism is characterized by occurrence of biotite, plagioclase, muscovite and sillimanite within the distributed shear bands, which define the late deformation foliation (S3). Phase equilibrium modeling reveals that Yardoi schists witnessed a peak metamorphism of upper amphibolite-facies under P-T conditions of 7-8 kbar and 615-665 degrees C, and records a clockwise P-T-t-D path with a prograde process of both temperature and pressure increase and subsequent retrogression of isothermal decompression. The zircon U-Pb dating indicates that the prograde process occurred during the Middle Eocene of 48-36 Ma and the retrograde metamorphism probably lasted to ca. 16 Ma. The present result shows that the formation of the Yardoi schists was related to the subduction and exhumation of Indian crust, the initial collision of Indian and Asian continents occurred at ca. 50 Ma, the northeastern margin of the Indian continent was shallowly underthrusted beneath the Asian continent, and distinct tectonic discontinuity is present in the Greater Himalayan Sequence. (C) 2016 Elsevier B.V. All rights reserved.
Subject Area地质学
WOS IDWOS:000382343700027
Language英语
Indexed BySCI
KeywordIndia-asia Collision Ultrahigh-pressure Eclogites Temperature-time Path Southern Tibet U-pb Zircon Geochronology Channel Flow Eastern Nepal Tectonic Significance Crystalline Complex
Cooperation Status国内
Department碰撞与隆升
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7672
Collection图书馆
Corresponding AuthorZhang, ZM
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
3.Zhejiang Inst Geol Survey, Hangzhou 311203, Zhejiang, Peoples R China
4.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Ding, HX ,Zhang, ZM ,Hu, KM ,et al. P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny[J]. TECTONOPHYSICS,2016,683(0):393-404.
APA Ding, HX .,Zhang, ZM .,Hu, KM .,Dong, X .,Xiang, H .,...&Zhang, ZM.(2016).P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny.TECTONOPHYSICS,683(0),393-404.
MLA Ding, HX ,et al."P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny".TECTONOPHYSICS 683.0(2016):393-404.
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