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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 59 (1975)

Issue: 11. (November)

First Page: 2161

Last Page: 2171

Title: Structural Framework of Continental Shelf and Slope off Southwestern Sierra Leone, West Africa

Author(s): Robert L. McMaster (2), Eric Christofferson (2), Asaf Ashraf (2)


Magnetic and seismic-reflection surveys have revealed the presence of faults and basic intrusive rocks, two open-ended shelf basins, a drowned delta, unconformities, a distorted sediment zone, nonuniform prograding, and slumps and slides on the continental shelf off southwestern Sierra Leone. Dominant northeastward and northwestward magnetic trends coincide with the directions of structural features of the Liberian (about 2,700 m.y.) and Pan African (about 550 m.y.) thermotectonic episodes. A basement fracture and deformation pattern with associated volcanism, reflecting weakness lineaments of these older thermotectonic episodes, is believed to have been exploited by Mesozoic deformation.

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