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Early Eocene (c. 50 Ma) collision of the Indian and Asian continents: Constraints from the North Himalayan metamorphic rocks, southeastern Tibet
Ding, HX (Ding, Huixia)1; Zhang, ZM (Zhang, Zeming)1,2; Dong, X (Dong, Xin)1; Tian, ZL (Tian, Zuolin)1; Xiang, H (Xiang, Hua)1; Mu, HC (Mu, Hongchen)3; Gou, ZB (Gou, Zhengbin)1; Shui, XF (Shui, Xinfang)1; Li, WC (Li, Wangchao)3; Mao, LJ (Mao, Lingjuan)3; Zhang, ZM
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
2016
Volume435Issue:0Pages:64-73
DOI10.1016/j.epsl.2015.12.006
AbstractDespite 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.
Subject Area地质学
WOS IDWOS:000369213900008
Language英语
Indexed BySCI
KeywordSouthern Tibet Tectonic Implications Thermodynamic Model Eurasia Collision Phase-equilibria Eastern Nepal High-pressure Evolution Subduction Sikkim
Cooperation Status国际
Department碰撞与隆升
Citation statistics
Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7769
Collection图书馆
Corresponding AuthorZhang, ZM
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China
3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Ding, HX ,Zhang, ZM ,Dong, X ,et al. Early Eocene (c. 50 Ma) collision of the Indian and Asian continents: Constraints from the North Himalayan metamorphic rocks, southeastern Tibet[J]. EARTH AND PLANETARY SCIENCE LETTERS,2016,435(0):64-73.
APA Ding, HX .,Zhang, ZM .,Dong, X .,Tian, ZL .,Xiang, H .,...&Zhang, ZM.(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(0),64-73.
MLA Ding, HX ,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 435.0(2016):64-73.
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