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GEOREF RECORD

Experimental water-rock interaction; silica geothermometers in the temperature range 100-350C

Ciriaco Giampaolo, Carlo Gorgoni, Annibale Mottana, Fabrizio Pagani and GianPaolo Sighinolfi
Experimental water-rock interaction; silica geothermometers in the temperature range 100-350C
European Journal of Mineralogy (February 1992) 4 (1): 53-65

Abstract

The reliability of silica geothermometers for different natural mineral assemblages and fluid compositions has been experimentally assessed in the P-T range 185-435 bar, 100-350 degrees C with the Barnes hydrothermal apparatus, using twomica schists and a dolomitic limestone from central Italy and fluids of pure sea- water composition. Silica geothermometry is poorly applicable to carbonate rock. For the feldspar-free mica schists, both the rock chemistry and the fluid composition affect silica solubility at any given P-T. The effect of rock composition is greatly diminished when saline fluids are used. Three new silica geothermometers were calibrated: two for oxidized and reduced silicate assemblages and pure water fluids and one for a variety of silicate assemblages interacting with marine fluids. Combined equations allow a reliable chemical geothermometry over the range 25-350 degrees C provide that the redox conditions of the reservoir and the composition of the initial fluid are known approximately.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 1
Title: Experimental water-rock interaction; silica geothermometers in the temperature range 100-350C
Affiliation: Univ. Roma "La Sapienza", Dipt. Sci. Terra, Rome, Italy
Pages: 53-65
Published: 199202
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 2 p.
Accession Number: 1993-025705
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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