Chemical composition and age of igneous rocks from the Sierra Leone Rise, supplement to: Kharin, Gennady S (1988): Igneous rocks of the Sierra Leone Rise (Equatorial Atlantic). Oceanology, 28(1), 58-63

Gennady S Kharin
Petrographic and petrochemical study of igneous rocks from the Sierra Leone Rise indicate that trachytes, trachyandesites, trachybasalts, and tuffs derived from them occur there. K-Ar age of these rocks is 36-43 million years. Alkalic igneous activity is associated with activity of hot spots.
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