Abstract
The results of a magnetotelluric survey are presented. A cover of Phanerozoic sediments, including a highly conductive layer of black shales of limited extent, precludes the exact definition of electrical features at depth; thus a comparison with the seismic reflections observed on GLIMPCE line J is impossible. However, the interpretation of the electromagnetic data proves to be an excellent illustration of electrical distortion and attenuation in 3-D environments. We show in particular that features originally interpreted as due to a thin conductor at mid-crustal depth are actually representative of edge effects related to the sedimentary cover
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