Gas contents and CO2 isotope studies on fluid inclusion in ultra-high pressure metamorphic rock from Shuanghe area, Dabie Mountain |
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| Authors: | Xinyu Xia Xianbin Wang Jiangfeng Chen Ningjie Ge |
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| Institution: | (1) Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) Department of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China |
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| Abstract: | Step heating experiments on ultra-high pressure (UHP) mcks from the Dabie Mountain shows a majority of CO2 in fluid inclusion (excluding H2O); CO is also a significant component, with a small content of N2 and CH4. Carbon isotopic composition of CO2 in fluid of metamorphic climax stage (-25%0- -30%0) is different from that of mantle carbon, indicating that UHP rocks did not experience obvious transformation by mantle fluids
despite their subduction depth. CO2 was derived from carbon matter in the pmtoliths of UHP rocks in a relatively confined system, showing that the UHP rocks
subsided quickly and uplifted quickly from the mantle.
Current organization: Research Institute of Petroleum Exploration and Development, Beijing 100083, China. |
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| Keywords: | UHP rocks fluid inclusion CO2 carbon isotope Dabie Mountain |
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