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Cation exchange equilibria between plagioclase and aqueous chloride solution at 600 to 700 degree C and 2 to 5 kbar

M. Schliestedt and W. Johannes
Cation exchange equilibria between plagioclase and aqueous chloride solution at 600 to 700 degree C and 2 to 5 kbar
European Journal of Mineralogy (June 1990) 2 (3): 283-295

Abstract

Equilibrium conditions for the cation exchange reaction 2NaAlSi (sub 3) O (sub 8) + CaCl (sub 2) = CaAl (sub 2) Si (sub 2) O (sub 8) + 4SiO (sub 2) + 2NaCl between synthetic plagioclase and aqueous chloride solution have been experimentally investigated at temperatures of 600 degrees C and 700 degrees C and pressures of 2 and 5 kbar. Solid reaction products were examined by X-ray diffraction, scanning electron microscopy and microprobe techniques; solution compositions were analysed by atomic absorption spectrometry. Cation distributions do not vary significantly in the P-T range investigated. The plagioclase solid solution is continuous showing positive deviation from ideality. Assuming ideally dilute behaviour of the 2 normal chloride solution, activity-composition relations of the plagioclase crystalline solution have been calculated according to the procedure of Blencoe et al. (1982). The resulting activity coefficients of albite and anorthite endmembers are higher than values calculated from previous cation exchange experiments and from high-temperature calorimetric measurements.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 2
Serial Issue: 3
Title: Cation exchange equilibria between plagioclase and aqueous chloride solution at 600 to 700 degree C and 2 to 5 kbar
Affiliation: Univ. Hannover, Inst. Mineral., D-3000 Hanover 1, Federal Republic of Germany
Pages: 283-295
Published: 199006
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 31
Accession Number: 1993-008894
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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