The lithospheric architecture of the western Borborema Province and northern São Francisco craton of NE Brazil has been investigated through analysis of long-period magnetotelluric data acquired along a 700 km long survey, using 12 instruments. The survey samples several tectonic terrains in the Province and penetrates into the adjacent São Francisco craton after crossing the Araripe Basin, an aborted rift basin filled with Mesozoic sediments that peak at ⇠ 1000 m above mean sea level. High conductivities are observed at shallow depths under the main Precambrian shear zones that pervade the Province -consistent with tectonic reactivation -and as a

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