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DOI	10.1016/j.epsl.2015.12.006
	Early Eocene (c. 50 Ma) collision of the Indian and Asian continents: Constraints from the North Himalayan metamorphic rocks, southeastern Tibet
	Ding, Huixia; Zhang, Zeming; Dong, Xin; Tian, Zuolin; Xiang, Hua; Mu, Hongchen; Gou, Zhengbin; Shui, Xinfang; Li, Wangchao; Mao, Lingjuan
通讯作者	Zhang, ZM (通讯作者)
发表日期	2016
ISSN	0012-821X
EISSN	1385-013X
起始页码	64
结束页码	73
卷号	435
英文摘要	Despite several decades of investigations, the nature and timing of the India-Asia collision remain debated. In the western Himalaya, the leading edge of the Indian continent was deeply subducted to mantle depths and experienced ultrahigh-pressure metamorphism in the Eocene at c. 50 Ma. In this paper, however, we demonstrate that the North Himalayan metamorphic rocks in the eastern Himalaya underwent Early Eocene (48-45 Ma) medium-pressure (MP) metamorphism due to shallow subduction of the Indian continent beneath southeastern Tibet. The studied garnet-kyanite-staurolite schists occur in the core of the Yardoi gneiss dome, the easternmost North Himalayan Gneiss Dome, and represent the upper structural level of the Higher Himalayan Crystallines (HHC). Petrology and phase equilibria modeling show that these rocks have mineral assemblages of Grt + Pl + Bt + Qz +/- Ky +/- St +/- Ms that were formed under conditions of 7-8 kbar and 630-660 degrees C. Zircon U-Pb chronology shows that these rocks have peak-metamorphic ages of 48-45 Ma and protracted zircon growth, indicating that the collision between Indian and Asian continents must have occurred at c. 50 Ma in southeastern Tibet. Combining with available data, we suggest that the HHC represents a crustal section of the subducted and subsequently exhumed Indian continent. Due to shallow subduction of the continent during the Eocene, the middle to lower crust of the continent was subducted into depths of 40-60 km and underwent high-pressure (HP) and high-temperature (HT) granulite-facies metamorphism and intense anatexis, whereas the upper crust was buried to shallower depths of 20-30 km and witnessed MP metamorphism and intrusion of leucogranites derived from the lower structural level of the HHC. (C) 2015 Elsevier B.V. All rights reserved.
关键词	SOUTHERN TIBET THERMODYNAMIC MODEL PHASE-EQUILIBRIA HIGH-PRESSURE SUBDUCTION EVOLUTION SIKKIM CRYSTALLINES EURASIA PALEOCENE
英文关键词	MP metamorphism; Early Eocene; Tethyan Himalaya; collisional orogen; shallow subduction; southeastern Tibet
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000369213900008
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/258705
推荐引用方式 GB/T 7714	Ding, Huixia,Zhang, Zeming,Dong, Xin,et al. Early Eocene (c. 50 Ma) collision of the Indian and Asian continents: Constraints from the North Himalayan metamorphic rocks, southeastern Tibet[J]. 中国科学院青藏高原研究所,2016,435.
APA	Ding, Huixia.,Zhang, Zeming.,Dong, Xin.,Tian, Zuolin.,Xiang, Hua.,...&Mao, Lingjuan.(2016).Early Eocene (c. 50 Ma) collision of the Indian and Asian continents: Constraints from the North Himalayan metamorphic rocks, southeastern Tibet.EARTH AND PLANETARY SCIENCE LETTERS,435.
MLA	Ding, Huixia,et al."Early Eocene (c. 50 Ma) collision of the Indian and Asian continents: Constraints from the North Himalayan metamorphic rocks, southeastern Tibet".EARTH AND PLANETARY SCIENCE LETTERS 435(2016).