Trace element and C-O-Sr-Nd isotope evidence for subduction-related carbonate-silicate melts in mantle xenoliths (Pannonian Basin, Hungary)

Détails

ID Serval
serval:BIB_00EEBD0C00EC
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Trace element and C-O-Sr-Nd isotope evidence for subduction-related carbonate-silicate melts in mantle xenoliths (Pannonian Basin, Hungary)
Périodique
Lithos
Auteur(s)
Demény A., Vennemann T.W., Hegner E., Nagy G., Milton J.A., Embey-Isztin A., Homonnay Z., Dobosi G.
ISSN-L
0024-4937
Statut éditorial
Publié
Date de publication
2004
Peer-reviewed
Oui
Volume
75
Pages
89-113
Langue
anglais
Résumé
Carbonate globules have been found in amphibole-bearing glass veins of
peridotite xenoliths from Szentbekalla (Balaton Highland, Central
Hungary). Strong resorption of amphibole suggests multiple fluid-melt
infiltration. Textural features of carbonate globules and the
surrounding silicate glass indicate a magmatic melt origin for the
carbonate and exclude the possibility of significant alteration. The
application of the cpx structural barometer for clinopyroxenes formed in
the silicate glass indicates high-pressure vein formation.
Laser-ablation ICP-MS analyses revealed trace element zoning within the
carbonate. Uniform profiles observed for various elements within the
carbonate indicate that the zoning is related to non-diffusive mixing
during carbonate-silicate interaction rather than to element diffusion.
The trace element composition of the centers of the globules (e.g. low
Ce/Pb and Nd/Pb ratios) suggests a crustal origin for the carbonate
melt. The C, 0, and Sr isotope compositions of the calcite globules
(delta(13)C about - 14 parts per thousand; delta(18)O about 22 parts per
thousand; (87)Sr/(86)Sr = 0.70533) also argue for a crustal origin of
the carbonate melt. Trace element and C-O-Sr isotopic compositions of
calcite globules suggest that the carbonate melt was derived from
subducted material. Injection of the carbonate melt into the peridotite
triggered amphibole melting. The carbonate and silicate melts
intermingled, but their interaction was confined to the margins of
carbonate globules. Preservation of trace element zoning and element
diffusion calculations indicate that the vein-hosting peridotite was
rapidly brought to the surface after the carbonate melt injection. (C)
2004 Elsevier B.V. All rights reserved.
Création de la notice
29/09/2012 16:23
Dernière modification de la notice
20/08/2019 12:23
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