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Titre du document / Document title

Mantle wedge water contents estimated from seismic velocities in partially serpentinized peridotites

Auteur(s) / Author(s)

CARLSON Richard L. (1) ; MILLER D. Jay (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Geology and Geophysics, Texas A&M University, College Station, Texas, ETATS-UNIS
(2) Ocean Drilling Program, Texas A&M University, College Station, Texas, ETATS-UNIS

Résumé / Abstract

[1] Water carried into subduction zones with the down-going plate and subsequently released by dehydration reactions at depth affects the composition of the mantle wedge, triggers partial melting and affects subduction zone seismicity. Partially serpentinized peridotite may be a significant reservoir for water in the subducted plate, the mantle wedge and the overriding plate. Here we develop a model that relates the degree of serpentinization and water content of partially serpentinized peridotites to their seismic P-wave velocities. In partially-serpentinized ultramafic rocks. a 1% decrease in P-wave velocity corresponds to a 2.4% increase in serpentine content, and a 0.3% (0.18 moles/m3) increase in H2O content (up to a maximum of 13%). Where there is evidence of serpentinization, mantle serpentine content is typically ∼15%, corresponding to 4-5 wt% H2C (6-10 moles/m3).

Revue / Journal Title

Geophysical research letters    ISSN  0094-8276   CODEN GPRLAJ 

Source / Source

2003, vol. 30, no5, pp. 54.1-54.4 (24 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

silicates

;

sheet silicates

;

metamorphic rocks

;

metaigneous rocks

;

igneous rocks

;

plutonic rocks

;

ultramafics

;

compressibility

;

serpentine

;

correlation

;

P-waves

;

models

;

seismicity

;

partial melting

;

oceanic crust

;

dehydration

;

subduction zones

;

serpentinite

;

serpentinization

;

peridotites

;

seismic waves

;

velocity

;

seismology

;

upper mantle

;

water content

;

Mots-clés français / French Keywords

Silicate

;

Phyllosilicate

;

Roche métamorphique

;

Roche métaignée

;

Roche ignée

;

Roche plutonique

;

Roche ultramafique

;

Expansion thermique

;

Compressibilité

;

Serpentine

;

Corrélation

;

Onde P

;

Modèle

;

Sismicité

;

Fusion partielle

;

Croûte océanique

;

Déshydratation

;

Zone subduction

;

Serpentinite

;

Serpentinisation

;

Péridotite

;

Onde sismique

;

Vitesse

;

Sismologie

;

Manteau sup

;

Teneur eau

;

Mots-clés espagnols / Spanish Keywords

Silicato

;

Filosilicato

;

Roca metamórfica

;

Roca metaígnea

;

Roca ignea

;

Roca granuda

;

Compresibilidad

;

Serpentina

;

Correlación

;

Onda P

;

Modelo

;

Sismicidad

;

Fusión parcial

;

Corteza oceánica

;

Deshidratación

;

Zona subducto

;

Serpentinidad

;

Serpentinización

;

Peridotitis

;

Onda sísmica

;

Velocidad

;

Manto globo sup

;

Contenido en agua

;

Localisation / Location

INIST-CNRS, Cote INIST : 16687, 35400011841195.0600

Nº notice refdoc (ud4) : 14892708



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