Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...42..215t&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 42, Issue 4, p. 215-226.
Physics
19
Scientific paper
Three deep electromagnetic soundings in the North Pacific Ocean were re-examined. Our inversion of existing data showed the presence of conductors below the three sites, in very good agreement with previous results.
We showed that H2O-rich fluids as well as partial melting account for the conductivities observed. This led us to determine temperatures ranging firstly, from 1050 to 1150°C, when only H2O-rich fluids were present, and secondly, from 1300 to 1350°C for partial melting only.
We suggest that the upper mantle below the two oldest sites (30 and 72 Ma) is characterized by about 1% of partial melting in the presence of about 1% of H2O-rich fluids. Below the third site, that nearest to the ridge zone (1 Ma), the degree of partial melting might reach 10%.
The presence of 1% of H2O-rich fluids would reduce the effect of the asthenospheric outflows on the lithospheric magmatism. This agrees with the principle of thermodynamic decoupling of the asthenosphere and lithosphere.
The weakening effect of fluids, particularly water, on upper mantle rheology is also discussed. We suggest that the asthenosphere and lithosphere might be decoupled mechanically, which, if true, would affect small scale convection below the oceanic lithosphere.
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