Title: Phase relations at interaction of phlogopite with carbonate melt at Р = 3.8 GPa
Abstract:The phase relations in the phlogopite-carbonate system were studied at P = 3.8 GPa, T = 1200-1300 C. The interaction of phlogopite with carbonate melt resulted in the formation of a polymineral associ...The phase relations in the phlogopite-carbonate system were studied at P = 3.8 GPa, T = 1200-1300 C. The interaction of phlogopite with carbonate melt resulted in the formation of a polymineral association of relic and newly formed phases of the phlogopite-carbonate-clinopyroxene-spinel-garnet composition coexisting with carbonate melt. By increasing the temperature from 1200 to 1300 C in the carbonate melt increases the solubility of phlogopite and the concentrations of its components - Si, Al, Mg, K. The phase composition of the quenching phases of the carbonate melt varies from substantially carbonate with isolated microcrystals of apatite and phlogopite at 1200 C to phlogopite-carbonate with a variety of texture ratios at 1300 C, reflecting the spontaneous crystallization of the carbonate melt during quenching. In the studied P-T, close to the mantle adiabate, phlogopite remains stable in the presence of silicate-carbonate melt.Read More