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DOI	10.1016/j.tecto.2016.06.035
	P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny
	Ding, Huixia; Zhang, Zeming; Hu, Kaiming; Dong, Xin; Xiang, Hua; Mu, Hongchen
通讯作者	Zhang, ZM (通讯作者)
发表日期	2016
ISSN	0040-1951
EISSN	1879-3266
起始页码	393
结束页码	404
卷号	683
英文摘要	Metamorphic 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.
关键词	ULTRAHIGH-PRESSURE ECLOGITES TEMPERATURE-TIME PATH SOUTHERN TIBET U-PB ZIRCON GEOCHRONOLOGY CHANNEL FLOW TECTONIC SIGNIFICANCE CRYSTALLINE COMPLEX THERMODYNAMIC MODEL PHASE-EQUILIBRIA
英文关键词	Metamorphism; Middle Eocene; P-T-t-D path; North Himalaya; Collisional orogeny
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000382343700027
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258752
推荐引用方式 GB/T 7714	Ding, Huixia,Zhang, Zeming,Hu, Kaiming,et al. P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny[J]. 中国科学院青藏高原研究所,2016,683.
APA	Ding, Huixia,Zhang, Zeming,Hu, Kaiming,Dong, Xin,Xiang, Hua,&Mu, Hongchen.(2016).P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny.TECTONOPHYSICS,683.
MLA	Ding, Huixia,et al."P-T-t-D paths of the North Himalayan metamorphic rocks: Implications for the Himalayan orogeny".TECTONOPHYSICS 683(2016).