Role of fluids in the origin of Tertiary European intraplate volcanism: Evidence from O, H, and Sr isotopes in melilitites

Détails

ID Serval
serval:BIB_71C0947CA31C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Role of fluids in the origin of Tertiary European intraplate volcanism: Evidence from O, H, and Sr isotopes in melilitites
Périodique
Geology
Auteur(s)
Hegner E., Vennemann T.W.
ISSN-L
0091-7613
Statut éditorial
Publié
Date de publication
1997
Peer-reviewed
Oui
Volume
25
Pages
1035-1038
Langue
anglais
Résumé
Low-volume melts from volatile-rich mantle domains, such as those
represented by the Tertiary melilitites from the Bad Urach-Hegau
volcanic district of southern Germany, are ideally suited for a study of
the fluids involved in intraplate volcanism. The delta(18)O values of
unaltered primitive melilitites (4.9 parts per thousand to 6.1 parts per
thousand) as well as those of hornblende (4.7 parts per thousand to 5.5
parts per thousand) and phlogopite (5.4 parts per thousand to 6.7 parts
per thousand) megacrysts from chemically evolved melilitite tuffs are
consistent with an origin from typical mantle, The delta D values of -91
parts per thousand td -98 parts per thousand of the unaltered primitive
melilitites support this inference, as they are similar to those of
other European Tertiary intraplate basalts. In contrast, the delta D
values for the hornblende and phlogopite megacrysts of -24 parts per
thousand to -42 parts per thousand indicate involvement of recycled
seawater probably during melt fractionation in the lithospheric mantle.
The combined H, O, and Sr isotope evidence is consistent with a
two-stage melt-evolution process in which melting was initiated in a
normal European-type mantle, followed in some cases by magma pending and
fractionation in the lithospheric mantle that had previously been
overprinted by recycled seawater.
Création de la notice
29/09/2012 16:23
Dernière modification de la notice
20/08/2019 14:30
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