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

Доклады Академии наук Pub Date : 2019-10-30 DOI:10.31857/s0869-56524886640-644

N. Gorbachev, Н С Горбачев, A. Kostyuk, А В Костюк, Y. Shapovalov, Ю Б Шаповалов, P. Gorbachev, П Н Горбачев, A. Nekrasov, Александр Николаевич Некрасов, D. M. Soultanov, Д М Султанов

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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.

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石墨云母与碳酸盐熔体在Р = 3.8 GPa下相互作用时的相关系

在P = 3.8 GPa, T = 1200 ~ 1300 c的条件下，研究了辉云石-碳酸盐体系的物相关系。辉云石与碳酸盐熔体的相互作用，形成了辉云石-碳酸盐-斜辉石-尖晶石-石榴石组成物与碳酸盐熔体共存的遗迹和新形成相的多矿物组合。通过将碳酸盐熔体温度从1200℃提高到1300℃，碳酸盐熔体的溶解度增加，其组分Si、Al、Mg、k的浓度增加。碳酸盐熔体的淬火相的物相组成变化很大，从1200℃时含有磷灰石和云母分离微晶的碳酸盐到1300℃时具有不同织质比的云母碳酸盐，反映了碳酸盐熔体在淬火过程中的自发结晶。在研究的P-T中，靠近地幔绝热层，在硅酸盐-碳酸盐熔体存在下，绿云母保持稳定。

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