Carbon isotope fractionation associated with HPHT crystallization of diamond |
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| Authors: | VN Reutsky Yu M Borzdov Yu N Palyanov |
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| Affiliation: | Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia |
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| Abstract: | We have studied the isotope properties of carbon phases including carbon source, diamond, carbon dissolved in metal melt and the gas phase formed at diamond crystallization experiment in the closed system Fe–Ni–C at 1450 °С and 5.5 GPa during 17.5 h. The δ13C value of the grown diamond decreases in direction of growth from ? 26.5 to ? 27.1‰, when the δ13C value of initial carbon is ? 27.1‰. Carbon isotope composition of the melt is by 3.2‰ lower than that of coexisting diamond. The data obtained agree well with the model calculations of isotope fractionation on crystallization from solution in a closed system. |
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