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

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

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e..54c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 5, pp. 54-1, CiteID 1250, DOI 10.1029/2002GL016600

Physics

29

Geochemistry: Composition Of The Mantle, Physical Properties Of Rocks: Acoustic Properties, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

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% H2O (6-10 moles/m3).

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