Carbon isotopes in eclogite and apatite separate from Huangzhen and Shima in SE Dabie |
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| Authors: | LI Yiliang ZHENG Yongfei GONG Bing FU Bin |
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| Institution: | Laboratory for Chemical Geodynamics, Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | The carbon isotope compositions of high- and ultrahigh-pressure eclogite and apatite separate from Huangzhen and Shima in
SE Dabie Mountains were analyzed by EA-MS online technique. The δ13C values of the eclogites cover a wide range of -30.7% ∓ 1.5%, whereas those of apatites only have a small range of -28.1
%—21.0‰ Some of the eclogites with the high δ13C values suffered retrogressive alteration by CO2-bearing fluids. The low δ13C values of the apatites indicate that the eclogites contain surficial carbon of organic origin. It is concluded that protoliths
of the eclogites were exposed to the surface of the Earth, and that the carbon-bearing fluid was depleted in13C during the eclogite-facies metamorphism. |
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| Keywords: | organic carbon carbon isotopes apatite eclogite Dabie Mountains |
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