The Cordierite-Garnet-Sillimanite-Quartz Equilibrium: Experiments and Applications
The Cordierite-Garnet-Sillimanite-Quartz Equilibrium: Experiments and Applications
复制标题
堇青石-石榴石-硅线石-石英平衡：实验与应用
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
K. Podlesskii
中科院分区：
文献类型：
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作者：
L. Aranovich;K. Podlesskii
堇青石-石榴子石-硅线石-石英共生体广泛存在于区域变质高级泥质岩和接触带角岩中。由于Korzhinskii（1936）认为它是变质条件的潜在指示物，因此该组合引起了岩石学家的极大兴趣。Marakushev（1965）的定性热力学分析表明，在FeO-MgO-Al_2O_3-SiO_2系统中，Cor + Gr + Sil + Qz共生可视为二元组合，Fe-Mg矿物组成由P-T条件确定。这种方法允许从P-T图上共存的堇青石和石榴石的Mg/（Mg + Fe）等值线的交点获得P-T估计，但不幸的是，实验和理论研究提供了相互矛盾的图校准。Lonker（1981）在他对这一问题的文献综述中列出了至少八项关于压力、温度和水逸度对Cor-Gr-Sil-Qz平衡的影响的研究，这些研究彼此不一致。
The paragenesis of cordierite-garnet-sillimanite-quartz is widespread in regionally metamorphosed high-grade pelitic rocks and in hornfelses of contact aureoles. Since Korzhinskii (1936) considered it as a potential indicator of metamorphic conditions, this assemblage has been of great interest to petrologists. Qualitative thermodynamic analysis by Marakushev (1965) showed that Cor + Gr + Sil + Qz paragenesis could be treated as divariant assemblage in the FeO-MgO-Al2O3-SiO2 system, the Fe-Mg minerals compositions having been defined by the P-T conditions. This approach allowed P-T estimates to be obtained from the intersection of isopleths of Mg/(Mg + Fe) of coexisting cordierite and garnet on a.P-T diagram, but unfortunately the experimental and theoretical studies provided conflicting calibrations of the diagram. In his review of the literature on the subject, Lonker (1981) has listed at least eight studies which disagree with each other concerning the effects of pressure, temperature, and water fugacity on the Cor-Gr-Sil-Qz equilibrium.