Abstract

Theoretical models and experimental data on the thermodynamic and rheological properties of basalts from the Apakhonchich lava flow (Klyuchevskoi Volcano, Kamchatka) were invoked for plotting projections of water-containing and dry liquidus and solidus curves on the Ps-T plane. The P-T-XH2O conditions for the formation of basaltic magma and the degree of its differentiation were determined from data on melt inclusions. The calculated apparent viscosity of the melt containing 10% crystals at 1100°C, 1 GPa, and 3 wt % water is 1.1 × 103 Pa s, and the density is 2.5 g/cm3.

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