Physics – Geophysics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3647j&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 19, p. 3647-3650
Physics
Geophysics
6
Exploration Geophysics: Instruments And Techniques, Marine Geology And Geophysics: Midocean Ridge Processes, Physical Properties Of Rocks: Magnetic And Electrical Properties, Tectonophysics: Rheology-General
Scientific paper
Vertical gradient electromagnetic sounding (VGS) on the Endeavour segment of Juan de Fuca mid-ocean ridge reveals the presence of a 2D ridge-parallel, conductivity anomaly. If the anomaly is caused mainly by melt in a conventional upper mantle upwelling zone alone, then the conductivity of the zone is about 0.6 S/m. The corresponding Archie's law melt fraction exceeds 0.10. A significantly lower melt fraction requires a sheet-like, well interconnected melt. Upwelling zone conductivity can be reduced by a third if the anomaly is broadened and a crustal conductor is added to the model.
Edwards Nigel R.
Jegen Marion
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