Evaporation Induced Isothermal Crystallization of Silicate Melt

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Chondrules, Crystallization, Evaporation, Kinetics, Melts: Silicate

Scientific paper

In order to investigate and role of evaporation and crystallization kinetics for silicate melt, isothermal vacuum experiments were carried out in the system MgO-SiO2. Due to successive evaporation, melt crystallized olivine at a fixed temperature. The evaporation rates and bulk chemical composition of residues varied with time, and reached a steady state. The pressure-composition phase diagram for the system at a fixed temperature well explains the experimental results. The results suggest a possibility of isothermal formation of chondrules (and some CAIs) at low pressures where evaporation takes place continuously.

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