Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45'S

Details Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45'S Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45'S

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3322301b&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 22, CiteID L22301

Physics

Geophysics

1

Geomagnetism And Paleomagnetism: Geomagnetic Induction, Marine Geology And Geophysics: Midocean Ridge Processes, Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Geographic Location: Pacific Ocean

Scientific paper

The electrical structure of the upper mantle beneath the East Pacific Rise (EPR) at 15°45'S is imaged by inverting seafloor magnetotelluric data obtained during the Mantle ELectromagnetic and Tomography (MELT) experiment. The electrical conductivity model shows no evidence for a conductive region immediately beneath the ridge, in contrast to the model previously obtained beneath the EPR at 17°S. This observation can be explained by differences in current melt production along the ridge, consistent with other observations. The mantle to the east of the ridge at 60 -100 km depth is anisotropic, with higher conductivity in the spreading direction compared to the along-strike direction, similar to the 17°S region. The high conductivity in the spreading direction can be explained by a hydrated mantle with strain-induced lattice preferred orientation of olivine or by partial melt preferentially connected in the spreading direction.

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