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Uncertainties in the activities of garnets and their propagation into geothermobarometry

Edgar Dachs
Uncertainties in the activities of garnets and their propagation into geothermobarometry
European Journal of Mineralogy (April 1994) 6 (2): 291-295

Abstract

The effect of uncertainties in the activities of garnets on P-T estimates are explored by propagating the (co-)variances of an internally consistent set of least-squares-derived mixing parameters through the thermodynamic formulations of both the garnet-biotite geothermometer and the garnet-Al (sub 2) SiO (sub 5) - plagioclase-quartz geobarometer. In combination with uncertainties related to DELTA H (super 0) (sub R) , DELTA S (super 0) (sub R) and composition, total uncertainties incorporating all types of errors can now be estimated. From data for 80 samples, it is concluded that typical uncertainties of the order of approx 60 degrees C and 1.5 kbar must be assumed for P-T estimates.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 2
Title: Uncertainties in the activities of garnets and their propagation into geothermobarometry
Author(s): Dachs, Edgar
Affiliation: Universitaet Salzburg, Institut fuer Mineralogie, Salzburg, Austria
Pages: 291-295
Published: 199404
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 30
Accession Number: 1994-025777
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199412
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