Water content and geotherm in the upper mantle above the stagnant slab: Interpretation of electrical conductivity and seismic P-wave velocity models

Details Water content and geotherm in the upper mantle above the stagnant slab: Interpretation of electrical conductivity and seismic P-wave velocity models Water content and geotherm in the upper mantle above the stagnant slab: Interpretation of electrical conductivity and seismic P-wave velocity models

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pepi..155....1i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 155, Issue 1-2, p. 1-15.

Physics

20

Scientific paper

Geotherm and water content profiles in the upper mantle above the stagnant slab of the Pacific back-arc were estimated from the electrical conductivity and seismic P-wave velocity (V) structures. The geothermal profiles were determined by using the electrical conductivity and seismic V structures, which, assuming a dry hartzburgite or a dry pyrolite composition, are designated as electrical and seismic geotherms, respectively. In a deeper part of the upper mantle, neither the dry pyrolite nor the dry harzburgite condition provides consistent electrical and seismic geotherms. This discrepancy can be explained by allowing for a small amount of water (500 1000 ppm H/Si) with the seismic geotherm. In a shallower part of the upper mantle, the electrical and seismic geotherms are consistent with each other within 1500 1700 ° C under the dry harzbutgite condition, whereas they are inconsistent by more than 100 ° C under the dry pyrolite condition. Alternatively, the wet pyrolite condition applied to the deeper part of the upper mantle also satisfies the electical conductivity and seismic V structures in the shallower part.

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