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/m
3) increase in H
2O content (up to a maximum of 13%). Where there is evidence of serpentinization, mantle serpentine content is typically ∼15%, corresponding to 4-5 wt% H
2C (6-10 moles/m
3).
Revue / Journal Title
Geophysical research letters
ISSN
0094-8276
CODEN GPRLAJ
Source / Source
2003, vol. 30, n
o5, 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
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
Mots-clés français / French Keywords
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
Mots-clés espagnols / Spanish Keywords
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
Localisation / Location
INIST-CNRS, Cote INIST : 16687, 35400011841195.0600
Nº notice refdoc (ud4) : 14892708
