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Gas contents and CO2 isotope studies on fluid inclusion in ultra-high pressure metamorphic rock from Shuanghe area, Dabie Mountain

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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.

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Authors and Affiliations

  1. Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000, Lanzhou, China

    Xinyu Xia & Xianbin Wang

  2. Department of Earth and Space Sciences, University of Science and Technology of China, 230026, Hefei, China

    Jiangfeng Chen & Ningjie Ge

Authors
  1. Xinyu Xia
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  2. Xianbin Wang
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  3. Jiangfeng Chen
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  4. Ningjie Ge
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Current organization: Research Institute of Petroleum Exploration and Development, Beijing 100083, China.

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Xia, X., Wang, X., Chen, J. et al. Gas contents and CO2 isotope studies on fluid inclusion in ultra-high pressure metamorphic rock from Shuanghe area, Dabie Mountain. Sci. China Ser. D-Earth Sci. 42, 620–626 (1999). https://doi.org/10.1007/BF02877789

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  • DOI: https://doi.org/10.1007/BF02877789

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