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Chemical parameters controlling the propylitic and argillic alteration process

Gilles Berger and Bruce Velde
Chemical parameters controlling the propylitic and argillic alteration process
European Journal of Mineralogy (December 1992) 4 (6): 1439-1454

Abstract

Computer simulation of the propylitic and argillic alteration mineral facies has enabled the variables T, water-rock ratio and chemical composition of the initial rock (basalt, andesite, rhyolite) to be tested independently, using fluid compositions approximating those from continental, marine and magmatic sources. The propylitic facies was found to be an isochemical alteration at water-rock ratios < 10 (super 2) -10 (super 1) ; the proportion of feldspars, muscovite, quartz, clays, etc. which appear depends on the initial chemical composition of the rock, but is independent of the initial fluid composition. The extreme argillic facies paragenesis (quartz, kaolinite) were simulated at < 200 degrees C at water-rock ratios > 10 (super 3) -10 (super 2) and with acid solutions; any factors which would tend to lower the pH of the fluid phase, e.g. CO (sub 2) or pyrite oxidation, would favour the development of an argillic facies mineral assemblage.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 6
Title: Chemical parameters controlling the propylitic and argillic alteration process
Affiliation: CNRS, Universite Paul Sabatier, Laboratoire de Geochimie, Toulouse, France
Pages: 1439-1454
Published: 199212
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 35
Accession Number: 1995-056263
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch map
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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