Physics – Geophysics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29v..11k&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 22, pp. 11-1, CiteID 2054, DOI 10.1029/2002GL016035
Physics
Geophysics
5
Marine Geology And Geophysics: Heat Flow (Benthic) And Hydrothermal Processes, Marine Geology And Geophysics: Midocean Ridge Processes, Marine Geology And Geophysics: Instruments And Techniques
Scientific paper
We present the first use at a mid-ocean ridge of a recently developed broadband marine magnetotelluric (MT) instrument. The extended high frequency performance of the instrument allows resolution of electrical resistivity structure at shallower depths than traditional marine MT sensors. Our two-dimensional inversion model from data collected at four MT sites on the East Pacific Rise (EPR) at 9°50'N demonstrates the viability of the method to image electrical resistivity structure in both the crust and shallow mantle. While our pilot experiment falls far short of the coverage needed to provide rigorous constraints on structure, a low resistivity zone in the crustal portion of the inversion model agrees well with seismic tomography and seafloor compliance results. Resistivities beneath the ridge imply a crustal partial melt fraction of 1-20%. A total melt volume of about 0.75 km3 per kilometer of ridge implies an average melt residence time of about 1000 years.
Constable Steven
Key Kerry
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