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Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica

Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan

Correspondence: ^* E-mail: Toru.Sugawara{at}gakushuin.ac.jp

Fusion enthalpies were measured by differential scanning calorimetry (DSC) for mineral mixtures of eutectic composition in the systems anorthite-diopside (An₄₂Di₅₈, wt%), anorthite-akermanite (An₄₆Ak₅₄), akermanite-diopside (Ak₄₂Di₅₈), diopside-silica (Di₈₄Qt₁₆), and anorthite-diopside-forsterite (Di₄₉Fo_7.5An_43.5), along with akermanite. Heats of mixing of silicate liquid in those systems were calculated based on the DSC data. The liquids of Di₄₉Fo_7.5An_43.5, An₄₂Di₅₈, An₄₆Ak₅₄, and Ak₄₂Di₅₈ have negative excess enthalpies of –4 to –10 (±5) kJ/mol, whereas the Di₈₄Qt₁₆ liquid has positive excess enthalpy of 5.0(±1.7) kJ/mol. Those values are consistent with the heats of mixing estimated by thermodynamic analyses of phase equilibria of the above systems. The results suggest that the differential scanning calorimetry is useful and sufficiently accurate for direct calorimetric measurement of small endothermic or exothermic heat of mixing in silicate liquid.

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