Isotope composition of helium in eclogite from the Dabie Mountains, central China and its geological significance |
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| Institution: | DU Jianguo+ 1, ZHANG Jianzhen+2, SUN Mingliang+1and ZHANG Youlian+3 1. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhuo 730000, China; 2. Shijiazhuang College of Economics, Shijiazhuang 050031, China; 3. Seismological Publishing House, Beijing 100081, China. Present address: Center for Analysis and Prediction, State Seismological Bureau, Beijing 100036, China. |
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| Abstract: | Isotopic geochemical characteristics of helium in garnet and omphacite of eclogite in the Dabie Mountains are discussed. Concentrations of 3He and 4He in garnet and omphacite are 3.9×10 -14- 24.0×10 -14 and 0.48×10 -7-9.42×10 -7cm+3·g -1, respectively. Values of 3He/ 4He have a range of (1.19-4.63)×10 -7. Helium in the eclogite is derived from both mantle and crust. Isotopic geochemical data of helium indicate that eclogite in the Dabie Mountains might be formed in depleted mantle and the age of the cologite would be Indo-China epoch. |
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| Keywords: | helium isotope eclogite Dabie Mountains |
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