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Abstract <p>The present work is devoted to the experimental study of phase relations in the CaSiO<sub>3</sub>–CaF<sub>2</sub> and Ca<sub>0.5</sub>Mg<sub>0.5</sub>SiO<sub>3</sub>–CaF<sub>2</sub> systems under mantle pressure. The experiments were run on a multianvil press in graphite capsules. At 6 GPa, both systems have an eutectic type of phase diagram. The breyite-fluorite eutectic is established at 1200°C and 37 mol % CaF<sub>2</sub> (14 wt % F). The diopside-fluorite eutectic is situated at 1300°C and 58 mol % CaF<sub>2</sub> (23 wt % F). Considering the melting points of breyite, 1750°C, and diopside, 1940°C, a presence of CaF<sub>2</sub> suppresses the silicate solidus by 550–640°C and yields formation of fluorine-rich Ca or Ca–Mg silicate melts under temperature conditions corresponding to the continental geotherms with a surface heat flux of 37 and 39 mW/m<sup>2</sup>, respectively, at a depth of 180 km.</p>

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The Systems CaSiO3–CaF2 and Ca0.5Mg0.5SiO3–CaF2 at 6 GPa

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月9日

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  • A. Shatskiy,
  • A. V. Kovalenko,
  • Yu. G. Vinogradova,
  • D. V. Shatskaya,
  • K. M. Stepanov,
  • D. E. Sidko,
  • G. N. Ovsyannikov,
  • C. A. Lorenz,
  • M. A. Nikitin

摘要

Abstract

The present work is devoted to the experimental study of phase relations in the CaSiO3–CaF2 and Ca0.5Mg0.5SiO3–CaF2 systems under mantle pressure. The experiments were run on a multianvil press in graphite capsules. At 6 GPa, both systems have an eutectic type of phase diagram. The breyite-fluorite eutectic is established at 1200°C and 37 mol % CaF2 (14 wt % F). The diopside-fluorite eutectic is situated at 1300°C and 58 mol % CaF2 (23 wt % F). Considering the melting points of breyite, 1750°C, and diopside, 1940°C, a presence of CaF2 suppresses the silicate solidus by 550–640°C and yields formation of fluorine-rich Ca or Ca–Mg silicate melts under temperature conditions corresponding to the continental geotherms with a surface heat flux of 37 and 39 mW/m2, respectively, at a depth of 180 km.