Abstract

Magnetic and gravimetric data from the central Alboran Sea allow identification of two axes of crustal thinning, which were probably active during the Oligocene—Early Miocene. The western Alboran basin axis is subparallel and may be related in origin to the Gibraltar Arc. The ENE—WSW trending Alboran Chan- nel axis is probably intruded by basic igneous rocks and may represent the western end of the Algerian—Balearic basin rift. Present-day small areas with high heat flow may well be related to volcanism and an anomalous mantle. Areas of active deformation in the Alboran Sea accom- modate the present Eurasia-Africa convergence.

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