H2O-δD-Fe-III relations of dehydrogenation and dehydration processes in magmatic amphiboles

Détails

ID Serval
serval:BIB_D448F76ABAC2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
H2O-δD-Fe-III relations of dehydrogenation and dehydration processes in magmatic amphiboles
Périodique
Rapid Communications in Mass Spectrometry
Auteur(s)
Demény A., Vennemann T.W., Harangi S., Homonnay Z., Forizs I.
ISSN-L
0951-4198
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
20
Pages
919-925
Langue
anglais
Résumé
Stable isotope compositions of a suite of magmatic amphiboles from
alkaline basalts and andesitic rocks were examined to constrain the
effects of degassing processes on the hydrogen isotope compositions. The
Fe3+ (as Fe3+/Fe-total) and H2O contents, as well as the H isotope
compositions of the amphiboles, differ markedly (27-58%, 0.5-2.2 wt%,
-107 to -15 parts per thousand, respectively) but indicate systematic
variations. The observed trends can be explained either as
dehydrogenation or dehydration processes, both of which are coupled to
oxidation processes, the latter most probably related to O2-
substitution within amphiboles. The dehydrogenation-dehydration models
can be used to assess the primary compositions of the magmas. As an
important example, delta D values of amphiboles of Martian meteorites
are discussed in a similar context. Copyright (c) 2006 John Wiley &
Sons, Ltd.
Création de la notice
29/09/2012 16:23
Dernière modification de la notice
20/08/2019 15:54
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