Abstract
USING the trends of equatorial, marginal fracture ridges, Le Pichon and Hayes1 proposed an early phase for the opening of the South Atlantic, with a pole of rotation at 21.5°N, 14°W with respect to Africa. Francheteau and Le Pichon2 tested this plate tectonic model with the whole South Atlantic and assumed that there is a relationship between continental margin offsets, the subsidence of coastal basins, and adjacent marginal fracture zones. We have studied extensions of fracture zones in the Gulf of Guinea and adjacent continental margins and have determined a new early opening pole that differs markedly from the one previously determined.
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