Abstract
The development of the northwestern edge of Africa in the interval 650 to 250 m.y. involved the filling of troughs with strata up to 10 km thick north and south of the Anti Atlas block, extensive volcanism, and invasion by granitic plutons, both in the Anti Atlas block and within the trough north of it. It is proposed that this development resulted from the closure of a Paleozoic seaway, and that it was accomplished by a subduction zone that dipped southward beneath the west African craton and ended with a continental collision.
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