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Excess free energies of mixing of Sr,Ba-bearing binary feldspar solid solutions (experimental data)

Published online by Cambridge University Press:  05 July 2018

A. R. Kotelnikov  and
I. V. Chernysheva
A. R. Kotelnikov
Affiliation:
Institute of Experimental Mineralogy Chernogolovka, Moscow distr., 142432, Russia
I. V. Chernysheva
Affiliation:
Vernadsky Institute of Geochemistry and Analytical Chemistry, Kosygin str., 19, 117975, Moscow, Russia
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Abstract

The distribution of potassium and strontium, potassium and barium between feldspars and aqueous chloride solutions was studied at 700°C, 2 kbar and 800°C, 2 kbar respectively. The distribution of Sr and Ba between coexisting feldspar and chloride solutions is not ideal; Sr and Ba are enriched in feldspar relative to solution. In order to estimate the phase state of the chloride solutions, special experiments were conducted using the synthetic fluid-inclusion method in the systems KCl-BaCl2-H2O and KCl-SrCl2-H2O at 700–800°C, 2 kbar. It was shown that (0.5M KCl+0.5M SrCl2) aqueous solution is homogeneous at 800°C, 2 kbar. The 0.25–0.5M SrCl2 solutions are homogeneous at 700°C 2, kbar. The (0.5M KCl+0.5M BaCl2) solution is homogeneous at 700°C, 2 kbar and heterogeneous at 800°C, 2 kbar. Margules parameters for describing the excess energy of mixing of the (K,Sr)- and (K,Ba)-feldspar solid solutions were calculated. The integrated values of excess energy of mixing () were estimated for the different binary feldspar solid solutions, and a correlation of with the crystallochemical parameter ρ = (RA-RB)/D(Me-O) was observed. Feldspar solid solutions can be subdivided into three groups based on the relationship between , p and the stability of the solid solution.

Keywords

(K,Sr) and (K,Ba) feldspar solid solutionsion exchange equilibriamixing properties
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 394 , March 1995 , pp. 79 - 91
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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