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Large calcite and bulk-rock volume loss in metacarbonate xenoliths from the Quérigut massif (French Pyrenees)

Durand, Cyril ; Marquer, Didier ; Baumgartner, Lukas ; Goncalves, Philippe ; Boulvais, Philippe ; Rossy, Michel

In: Contributions to Mineralogy and Petrology, 2009, vol. 157, no. 6, p. 749-763

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    Title
    • Large calcite and bulk-rock volume loss in metacarbonate xenoliths from the Quérigut massif (French Pyrenees)
    Author
    • Durand, Cyril. Insitute of Mineralogy and Geochemistry, University of Lausanne, BFSH2, 1015, Lausanne, Switzerland
    • Marquer, Didier. Chrono-Environment, UMR 6249, University of Franche-Comté, 16 Route De Gray, 25030, Besançon Cedex, France
    • Baumgartner, Lukas. Insitute of Mineralogy and Geochemistry, University of Lausanne, BFSH2, 1015, Lausanne, Switzerland
    • Goncalves, Philippe. Chrono-Environment, UMR 6249, University of Franche-Comté, 16 Route De Gray, 25030, Besançon Cedex, France
    • Boulvais, Philippe. Geosciences, UMR 6118, University Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
    • Rossy, Michel. Chrono-Environment, UMR 6249, University of Franche-Comté, 16 Route De Gray, 25030, Besançon Cedex, France
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Contributions to Mineralogy and Petrology, 2009, vol. 157, no. 6, p. 749-763. Springer-Verlag
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:316846
    Summary
    Chemical mass transfer was quantified in a metacarbonate xenolith enclosed within the granodiorite of the Quérigut massif (Pyrenees, France). Mass balance calculations suggest a strong decrease of CaO, SrO and CO2 contents (up to −90%), correlated with a decrease of modal calcite content as the contact is approached. Most other chemical elements behave immobile during metasomatism. They are therefore passively enriched. Only a small increase of SiO2, Al2O3 and Fe2O3 contents occurs in the immediate vicinity of the contact. Hence, in this study, skarn formation is characterized by the lack of large chemical element influx from the granitoid protolith. A large decrease of the initial carbonate volume (up to −86%) resulted from a combination of decarbonation reactions and loss of CaO and CO2. The resulting volume change has potentially important consequences for the interpretation of stable isotope profiles: the isotope alteration could have occured over greater distances than those observed today