Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106612t&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 6, CiteID L06612
Physics
31
Geomagnetism And Paleomagnetism: Geomagnetic Induction, Mineral Physics: Electrical Properties, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General
Scientific paper
A deep magnetotelluric sounding in the French Alps provided a vertical electrical conductivity profile between ~200-1000 km. Two prominent features are observed. First, the conductivity in the depth range 400-800 km is smaller than the conductivity of a pyrolite mantle obtained from laboratory results for a normal geotherm. Second, the data do not require the conductivity to change throughout the transition zone (410-660 km). In this part of the mantle, a temperature of 350-450 C less than normal explains the magnetotelluric conductivity profile. At 200-400 km, our model favors a cold mantle with 1000-1500 ppm of water dissolved in olivine. If correct, this model suggests that the subducted slab is dehydrated before reaching the transition zone.
Hautot Sophie
Perrier Frédéric
Tarits Pascal
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