Abstract

Geophysical and geologic data, together with geometric considerations, reveal the location and trend of the northern and southern boundaries of the Senegal microplate, west Africa. The Paleozoic southern margin follows the Koulountou branch of the Mauritanide fold belt from an exposed northeast trend around to a northwest trend beneath the cover of the Senegal-Mauritania basin. The northern boundary of the Senegal microplate is suggested to follow a northwest-southeast-trending zone 100 km south of the previously suggested margin. These plate boundaries explain the restricted rifting and collision of the Senegal microplate with the west African craton through the Paleozoic and elucidate the position of the Florida block in the Pangean assembly of North America, South America, and Africa.

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