U-Pb zircon age of the foliated garnet-bearing granites in western Dabie Mountains, Central China |
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Authors: | Hongfei Zhang Zengqiu Zhong Shan Gao Benren Zhang Huiming Li |
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Affiliation: | (1) Faculty of Earth Sciences, China University of Geosciences, 430074 Wuhan, China;(2) Department of Geology, Northwest University, 710069 Xi’an, China;(3) Tianjin Institute of Geology and Mineral Resource, 300170 Tianjin, China |
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Abstract: | U-Pb zircon dating on two foliated garnet-bearing granite samples in the western Dabie ultra-high-pressure (UHP) metamorphic unit yields concordant ages of (234±4) Ma and (227±5) Ma, respectively. These ages, following the UHP peak metamorphism, represent the magma emplacement ages for the foliated garnet-bearing granites. This, for the first time, shows that there are the Triassic granites in the Dabie Mountains. The foliated garnet-bearing granites resemble A-type granite in geochemical characteristics, indicating that they were formed in extensional geodynamic setting. The magma formation reflects a reheating event in the Dabie orogenic belt and it enhances the transfer of tectonic regime from collision into extension and promotes the rapid exhumation into lower crust for the UHP metamorphic rocks. |
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Keywords: | Dabie orogenic belt foliated garnet-bearing granite U-Pb zircon age post-collisional granite |
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