Gou, Long-Long and Long, Xiao-Ping and Yan, Hao-Yu and Shu, Tian-Chu and Wang, Jing-Yu and Xu, Xiao-Fei and Zhou, Feng and Tian, Zhi-Bo (2022) Metamorphic P–T Evolution and In Situ Biotite Rb–Sr Geochronology of Garnet–Staurolite Schist From the Ramba Gneiss Dome in the Northern Himalaya. Frontiers in Earth Science, 10. ISSN 2296-6463
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Abstract
The North Himalayan gneiss domes provide a window for looking into the deeper crust and record abundant clues of continent collisional orogenesis. This study carried out detailed petrology, in situ LA–ICP–MS biotite Rb–Sr dating, and phase equilibrium modeling on garnet–staurolite–two-mica schist in the Ramba gneiss dome in order to constrain metamorphic P–T evolution and the timing of metamorphism. A clock-wise P–T path, involving an early prograde process that evolves from ∼540°C at ∼4.4 kbar to ∼630°C at ∼6.0 kbar, was constructed for garnet–staurolite–two-mica schist in the Ramba gneiss dome. In situ LA–ICP–MS biotite Rb–Sr analysis yielded two metamorphic ages of 37.17 ± 5.66 and 5.27 ± 3.10 Ma, corresponding to the timing of retrograde cooling and the cooling age of the dome following the thermal resetting by the emplacement of ca. 8 Ma leucogranite pluton in the core of the dome, respectively. The peak metamorphism is inferred to be older than ca. 37 Ma. Based on these results and the data previously published, the garnet–staurolite–two-mica schist recorded the Eocene crustal thickening, following the India–Asia collision and later the exhumation process.
Item Type: | Article |
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Subjects: | Librbary Digital > Geological Science |
Depositing User: | Unnamed user with email support@librbarydigit.com |
Date Deposited: | 22 Mar 2023 10:21 |
Last Modified: | 07 Sep 2024 10:48 |
URI: | http://info.openarchivelibrary.com/id/eprint/366 |