Synthesis of the crustal structure of the transform continental margin off Ghana, northern Gulf of Guinea |
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| Authors: | R A Edwards R B Whitmarsh R A Scrutton |
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| Institution: | (1) Institute of Oceanographic Sciences Deacon Laboratory, Wormley, Godalming, Surrey GU8 5UB, UK, GB;(2) Department of Geology and Geophysics, Grant Institute, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK, GB |
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| Abstract: | Results of a detailed geophysical transect across the transform continental margin off Ghana, at the eastern end of the Romanche
Fracture Zone in the Equatorial Atlantic, are presented. Seismic refraction, single-channel seismic reflection, gravity, and
magnetic data were collected, and seismic, gravity, and magnetic models along the transect are shown. The 6- to 11-km-wide
ocean–continent transition (OCT) is characterized by a high-velocity, high-density, high-magnetization crustal zone. The models
show no evidence for any underplating of the continental crust adjacent to the margin but minor melting and intrusion of the
continental crust may have occurred in the vicinity of the OCT.
Received: 6 February 1995/Revision received: 24 July 1995 |
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