Abstract
Melting relations in the multicomponent diamond-forming systems of the upper mantle with a boundary of K–Na–Mg–Fe–Ca carbonate, phases of the model peridotite and eclogite, carbon, and titanium minerals from kimberlite (ilmenite FeTiO3, perovskite CaTiO3, and rutile TiO2) were studied experimentally at 7–8 GPa and 1600–1650°C. Perovskite reacts with the formation of rutile in the diamond-forming silicate–carbonate melts. We discovered liquid immiscibility between melts of titanium minerals, on the one hand, and carbonate–carbon, peridotite–carbonate–carbon, and eclogite–carbonate–carbon diamond-forming melts, on the other. The solubility of titanium mineral in diamond-forming melts is negligible independent of their concentration in the experimental systems. Growth melts retain high diamond-forming efficiency. In general, the experimental results are evident for the xenogenic nature of titanium minerals in inclusions in diamond and, therefore, in diamond-forming melts. It is shown that the physicochemical factors that may correlate the diamond content with the concentration of Ti in kimberlite do not occur during the diamond genesis in silicate–carbonate–carbon parental melts containing titanium minerals and their melts.
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Original Russian Text © Yu.A. Litvin, A.V. Bovkun, V.K. Garanin, 2018, published in Geokhimiya, 2018, No. 2, pp. 160–174.
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Litvin, Y.A., Bovkun, A.V. & Garanin, V.K. Interaction of Titanium Minerals and Their Melts with Diamond-Forming Media (Experiments at 7–8 GPa). Geochem. Int. 56, 148–161 (2018). https://doi.org/10.1134/S0016702918010032
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DOI: https://doi.org/10.1134/S0016702918010032