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Experimental modeling reveals hydrocarbon-rich fluids drive subcalcic chromium garnet crystallization in mantle systems, suggesting organic metasomatic growth.
The results of experimental modeling of the crystallization conditions for subcalcic Cr-rich garnets in the serpentine – chromite – carbonatite system at a pressure of 5 GPa and a temperature of 1300°C are presented. A mineral association of highly magnesian olivine and orthopyroxene, garnet and chrome-spinel is formed in the experiments. It has been established that subcalcic Cr-pyrope can crystallize in the form of metacrystals during metasomatism as a result of infiltration of the fluid phase. In the presence of graphite, the fluid phase has a complex composition with predominance of hydrocarbons and oxygen-, nitrogen-, and sulfur-containing organic compounds with minor amounts of inorganic gases, including CO2 and H2O.
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Чепуров et al. (2025) studied this question.
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