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Abstract <p>Experiments on partial melting of garnet–two mica schist with 0–20 wt % graphite were carried out at 900°C and 500 MPa. The experiments showed that, at all graphite contents, the melts form due to reactions of peritectic melting of biotite, muscovite, and partly quartz: <i>Bt + Ms + Qz</i> → <i>Kfs + Spl(Hc) + Sil</i> <i>+ Gl&#xa0;± oAm</i>. A decrease in the Fe<sup>3+</sup>/(Fe<sup>3+</sup> + Fe<sup>2+</sup>) ratio of Fe–Mg minerals with an increasing amount of graphite reflects the enhanced reducing conditions. Oxygen, which is released as a result of oxidation–reduction of Fe, interacts with graphite, which leads to the formation of CO<sub>2</sub>. It is partly dissolved in the melt with the formation of Ca, Mg, and K carbonate complexes and accompanies the melt in the form of a free fluid phase. The experiments show that the graphite-bearing metapelites could be effective internal CO<sub>2</sub> sources under high-temperature metamorphism.</p>

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Internal CO2 Sources during Anatexis under High-Temperature Metamorphism: Experimental Data

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • O. G. Safonov,
  • L. I. Khodorevskaya,
  • S. A. Kosova,
  • A. V. Spivak,
  • L. Ya. Aranovich

摘要

Abstract

Experiments on partial melting of garnet–two mica schist with 0–20 wt % graphite were carried out at 900°C and 500 MPa. The experiments showed that, at all graphite contents, the melts form due to reactions of peritectic melting of biotite, muscovite, and partly quartz: Bt + Ms + Qz → Kfs + Spl(Hc) + Sil + Gl ± oAm. A decrease in the Fe3+/(Fe3+ + Fe2+) ratio of Fe–Mg minerals with an increasing amount of graphite reflects the enhanced reducing conditions. Oxygen, which is released as a result of oxidation–reduction of Fe, interacts with graphite, which leads to the formation of CO2. It is partly dissolved in the melt with the formation of Ca, Mg, and K carbonate complexes and accompanies the melt in the form of a free fluid phase. The experiments show that the graphite-bearing metapelites could be effective internal CO2 sources under high-temperature metamorphism.