Abstract
We present and discuss petrological investigations carried out on basalt dredged on one of the magnetic seamounts from the southern Guinean continental slope, within the Equatorial Atlantic. Microprobe analyses of clinopyroxenes suggest the alkalic magmatic affinity of the basalts. We suggest that the volcanic seamounts have been emplaced along a complex transform margin boundary during the progressive oblique opening of the Equatorial Atlantic in lower Cretaceous time.
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