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Detailed Reference Information |
Baba, K., Tarits, P., Chave, A.D., Evans, R.L., Hirth, G. and Mackie, R.L. (2006). Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45'S. Geophysical Research Letters 33: doi: 10.1029/2006GL027528. issn: 0094-8276. |
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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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Abstract |
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Keywords
Geomagnetism and Paleomagnetism, Geomagnetic induction, Marine Geology and Geophysics, Midocean ridge processes, Tectonophysics, Dynamics of lithosphere and mantle, general, Geographic Location, Pacific Ocean |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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