Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45′S
Chave, Alan D.
Evans, Rob L.
Mackie, Randall L.
MetadataShow full item record
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.
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 33 (2006): L22301, doi:10.1029/2006GL027528.
Showing items related by title, author, creator and subject.
Hemichannel composition and electrical synaptic transmission : molecular diversity and its implications for electrical rectification Palacios-Prado, Nicolas; Huetteroth, Wolf; Pereda, Alberto E. (Frontiers Media, 2014-10-15)Unapposed hemichannels (HCs) formed by hexamers of gap junction proteins are now known to be involved in various cellular processes under both physiological and pathological conditions. On the other hand, less is known ...
Prediction of silicate melt viscosity from electrical conductivity : a model and its geophysical implications Pommier, Anne; Evans, Rob L.; Key, Kerry; Tyburczy, James A.; Mackwell, Stephen; Elsenbeck, James R. (John Wiley & Sons, 2013-06-12)Our knowledge of magma dynamics would be improved if geophysical data could be used to infer rheological constraints in melt-bearing zones. Geophysical images of the Earth's interior provide frozen snapshots of a dynamical ...
Water in cratonic lithosphere : calibrating laboratory-determined models of electrical conductivity of mantle minerals using geophysical and petrological observations Jones, Alan G.; Fullea, Javier; Evans, Rob L.; Muller, Mark R. (American Geophysical Union, 2012-06-14)Measurements of electrical conductivity of “slightly damp” mantle minerals from different laboratories are inconsistent, requiring geophysicists to make choices between them when interpreting their electrical observations. ...