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

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Serval ID
serval:BIB_912CB14AFFD1
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Large calcite and bulk-rock volume loss in metacarbonate xenoliths from the Qu,rigut massif (French Pyrenees)
Journal
Contributions to Mineralogy and Petrology
Author(s)
Durand C., Marquer D., Baumgartner L.P., Goncalves P., Boulvais P., Rossy M.
ISSN-L
0010-7999
Publication state
Published
Issued date
2009
Peer-reviewed
Oui
Volume
157
Pages
749-763
Language
english
Abstract
Chemical mass transfer was quantified in a metacarbonate xenolith
enclosed within the granodiorite of the Qu,rigut massif (Pyrenees,
France). Mass balance calculations suggest a strong decrease of CaO, SrO
and CO(2) 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 SiO(2), Al(2)O(3) and
Fe(2)O(3) 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 CO(2). 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.
Open Access
Yes
Create date
02/10/2012 19:47
Last modification date
01/10/2019 7:18
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