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首页> 美国政府科技报告 >Thermodynamic Properties of Crystals and Melts Based on Calorimetric Data and Plagioclass-Melt Equilibria in the System Albite-Anorthite-Diposide
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Thermodynamic Properties of Crystals and Melts Based on Calorimetric Data and Plagioclass-Melt Equilibria in the System Albite-Anorthite-Diposide

机译：基于量热数据和斜长石 - 熔体平衡的晶体和熔体的热力学性质在albite-anorthite-Diposide系统中

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摘要

Thermochemical data for high plagioclase (P) solid solutions and for glasses in the system albite-anorthite-diopside (AAD) can be coupled with the heats of fusion of albite and anorthite, ion exchange equilibria between P crystal and aqueous fluid, and coexisting P and melt compositions in AAD to produce a consistent model of mixing properties in crystals and melts in AA. The crystalline high temperature Ps are described by positive heats of mixing and the aluminum-avoidance entropy model of Kerrick and Darken (1975), leading to positive deviations from Raoult's Law below 1000 exp 0 K, conformity at intermediate temperatures (approx. 1500 K), and negative deviations above > 1750 exp 0 K. This model predicts P exsolution with cmpositions in the region of Boggild and Huttenlocher intergrowths but provides no evidence for the peristerite gap. Liquids in the region of the P saturation surface of AAD are shown to have entropies of mixing significantly less positive than predicted by the two-lattice model of Weill et al. (1980), which was adequate for the pyroxene saturation surface of that system. Along the AA binary these deviations are not consistent with aluminum avoidance in the liquid, but can be described by an empirical regular excess entropy term or the assumption of strong Ca-Al charge balance. The AA binary liquidus loop can be calculated in satisfactory agreement with experiment. (ERA citation 81:026427)

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