Monazite U-Th-Pb age of Liemai Eocene granites in the southern Tibet and its geological implications

CAO Huawen; LI Guangming; ZHANG Linkui; DONG Lei; GAO Ke; DAI Zuowen

doi:10.19826/j.cnki.1009-3850.(2020)02-0031-12

Sedimentary Geology and Tethyan Geology > 2020 > 40(2): 31-42. > DOI: 10.19826/j.cnki.1009-3850.(2020)02-0031-12

CAO Huawen, LI Guangming, ZHANG Linkui, DONG Lei, GAO Ke, DAI Zuowen. Monazite U-Th-Pb age of Liemai Eocene granites in the southern Tibet and its geological implications[J]. Sedimentary Geology and Tethyan Geology, 2020, 40(2): 31-42. DOI: 10.19826/j.cnki.1009-3850.(2020)02-0031-12

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Monazite U-Th-Pb age of Liemai Eocene granites in the southern Tibet and its geological implications

Chengdu Center, China Geological Survey, Chengdu 610081,Sichuan,China

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Received Date: February 02, 2020
Revised Date: May 03, 2020
Published Date: June 29, 2020

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Abstract

Abstract

The age and tectonic setting of Eocene granites from Liemai in Longzi County, Tibet are of great significance to the tectonic evolution of the Himalayan region in the syncollision stage. In this paper, monazite LA-ICP-MS U-Th-Pb dating has been carried out for muscovite granites in Jieguidang. The weighted average age of ²⁰⁸Pb/²³²Th is 41 ±0.1 Ma (MSWD=1.4, n=40), which was formed in the Middle Eocene. Combined with the Eocene magmatic rocks and metamorphism in the region, it is considered that the middle high pressure metamorphism and partial melting occurred in the India lower crust at 50-45 Ma. The Neo-Tethys oceanic crust plate separated and the asthenosphere mantle upwelling occurred at 45 Ma. The Himalaya experienced a short-term extension environment, which resulted in a large number of adakitic magmatic rock emplacement and eclogite exhumation at 45-41 Ma.
- Eocene,
- muscovite granite,
- monazite U-Th-Pb age,
- Shannan area,
- Himalaya

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Monazite U-Th-Pb age of Liemai Eocene granites in the southern Tibet and its geological implications

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