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Abstract <p>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 CO<sub>2</sub> and H<sub>2</sub>O.</p>

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The Component Composition of Fluid Phase during Crystallization of Subcalcic Chromium Garnet at High Pressure

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • A. A. Chepurov,
  • A. A. Tomilenko,
  • V. V. Lin,
  • V. M. Sonin,
  • E. I. Zhimulev,
  • T. A. Bul’bak,
  • A. I. Chepurov,
  • N. P. Pokhilenko

摘要

Abstract

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.