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- W2053008581 abstract "It is possible to model the excess molar Gibbs free energy at any point of the ternary system albite-sanidine-rubidium feldspar from a knowledge of the three equilibria between hydrothermal chloride solutions and binary feldspars. The domain of immiscibility determined at 600 °C, 150 MPa by ternary exchange experiments corresponds to an excess energy larger than 3 kJ·mol−1. The composition of the fluid in equilibrium with feldspars is richer in Na than the one-phase feldspar or the mechanical mixture of two feldspars, except near the albite end member, and its K/Rb ratio is always similar to that of the solid. The experiments cannot explain the compositions of natural Rb feldspars which seem to correspond to a solvus. Some hypotheses are presented for future studies. La modélisation de l'enthalpie libre d'excès, en chaque point du système ternaire albite-sanidine-feldspath rubidique, peut se faire à partir de la connaissance des trois équilibres entre solution hydrothermale chlorurée et feldspaths binaires. Les résultats d'expériences d'échanges ternaires, à 600 °C et 150 MPa, montrent que l'immiscibilité du solide intervient pour une enthalpie d'excès supérieure à 3 kJ·mol−1. La solution en équilibre avec les feldspaths est plus riche en Na que le feldspath monophasé ou que le mélange mécanique de deux phases, excepté près du pôle sodique et son rapport K/Rb est toujours assez proche de celui du solide. Les résultats de ces expériences n'expliquent pas les compositions des feldspaths rubidiques naturels qui semblent dessiner un solvus. Quelques hypothèses de travail sont proposées." @default.
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- W2053008581 date "1998-08-01" @default.
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- W2053008581 title "Le système feldspathique ternaire Na-K-Rb: modélisation et expérimentation" @default.
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- W2053008581 doi "https://doi.org/10.1016/s1251-8050(98)80001-3" @default.
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