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Low-temperature chlorite geothermometry; a graphical representation based on a T-R (super 2+) -Si diagram

Franck Bourdelle and Michel Cathelineau
Low-temperature chlorite geothermometry; a graphical representation based on a T-R (super 2+) -Si diagram
European Journal of Mineralogy (July 2015) 27 (5): 617-626

Abstract

The chlorites are good indicators of rock history because their wide compositional variations are sensitive to the formation conditions, like pressure (P), temperature (T), redox state, fluid composition. Accordingly, many geothermometers based on their composition, either empirically or thermodynamically, have been proposed during the last 30 years, especially in low-temperature contexts (T < 350 degrees C). This paper presents a graphical tool that considerably facilitates the use of two of the most recent chlorite thermometers for low- and very-low-T chlorites. The temperature-composition relationships for low-T chlorites are represented in T-R (super 2+) -Si diagrams, allowing chlorite compositions to be predicted as a function of temperature or, conversely, temperature to be estimated from compositional fields of natural chlorites. This graphical projection is based on a comparison of the parameters (ideal chlorite compositions and calculated T) predicted by geothermometers with analyses of natural chlorites for which independent T estimates are available over a range of geological environments. The new T-R (super 2+) -Si diagram provides a practical tool for thermometric purposes in the applicability range of the considered models, in particular for diagenesis and low-grade metamorphism.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 27
Serial Issue: 5
Title: Low-temperature chlorite geothermometry; a graphical representation based on a T-R (super 2+) -Si diagram
Affiliation: Universite Lille 1, Laboratoire de Genie Civil et Geo-Environnement, Villeneuve d'Ascq, France
Pages: 617-626
Published: 20150720
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 43
Accession Number: 2015-082163
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universite de Lorraine, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201535
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