Phase relations at interaction of phlogopite with carbonate melt at Р = 3.8 GPa

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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 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.


About the authors

N. S. Gorbachev

D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences

Author for correspondence.
Email: gor@iem.ac.ru

Russian Federation, 4, Academica Osypyana str., Chernogolovka, Moscow region, 142432

A. V. Kostyuk

D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences

Email: gor@iem.ac.ru

Russian Federation, 4, Academica Osypyana str., Chernogolovka, Moscow region, 142432

Yu. B. Shapovalov

D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences

Email: gor@iem.ac.ru

Russian Federation, 4, Academica Osypyana str., Chernogolovka, Moscow region, 142432

Corresponding Member of the Russian Academy of Sciences

P. N. Gorbachev

D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences

Email: gor@iem.ac.ru

Russian Federation, 4, Academica Osypyana str., Chernogolovka, Moscow region, 142432

A. N. Nekrasov

D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences

Email: gor@iem.ac.ru

Russian Federation, 4, Academica Osypyana str., Chernogolovka, Moscow region, 142432

D. M. Soultanov

D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences

Email: gor@iem.ac.ru

Russian Federation, 4, Academica Osypyana str., Chernogolovka, Moscow region, 142432

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