Publisher: Bachudo Science Co. Ltd

Evidence For Upper Mantle Intrusion In The West African Coastal Sedimentary Basins From Gravity Data: The Case of The Southern Part of The Douala Basin, Cameroon

F. Koumetio, C. T. Tabod, E. Manguelle–dicoum
KEYWORDS: Bouguer anomaly, dome, graben

ABSTRACT:

The Bouguer anomaly map of the region between latitudes 30N and 3045’N and longitudes 9030’E and 10010’E and which forms the southern part of the Douala Basin, shows ring-like positive contour lines. The Bouguer gravity profiles obtained across the gravity anomaly contour lines in the region have been interpreted using 2D1/2 gravity modelling. The results reveal that in the southern part of the Douala Sedimentary Basin, two major structures exist: a half-dome of mantle material explained by isostatic compensation and a pillar of high density rocks probably representing an upper mantle intrusion down to a depth of about 14 km. The similarities of these results with those obtained in the coastal sedimentary basin of Mauritania-Senegal suggest a more extensive movement that would have affected the whole of West African coast



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