Crustal structure and ocean–continent transition at marginal ridge: the Côte d’Ivoire–Ghana marginal ridge |
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| Authors: | F Sage B Pontoise J Mascle C Basile L Arnould |
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| Institution: | (1) UMR “Geosciences Azur”: Unite Mixte de Recherche CNRS – ORSTOM – Universite de Nice – Sophia Antipolis – Universite Pierre et Marie Curie, B.P. 48, 06230 Villefranche-sur-Mer, France, FR;(2) URA – CNRS no. 69, Universite de Grenoble I, Institut Dolomieu, 15, Rue Maurice Gignoux, 38031 Grenoble Cedex, France, FR |
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| Abstract: | Crustal structure of the Co^te d’Ivoire–Ghana marginal ridge and its transition with oceanic lithosphere are deduced from
multichannel seismic reflection, wide-angle seismic, and gravity data. The CIGMR is cut into rotated blocks and displays a
crustal structure quite similar to that of the nearby northern Ivorian extensional basin. These results strongly support that
the CIGMR represents an uplifted fragment of continental crust. Transition with the oceanic crust appears sharp; continental
crustal thinning occurs over less than 5 km. We did not find evidence for underplating and/or contamination as anticipated
from such a sharp contact between continental and oceanic crust.
Received: 12 March 1995/Revision received: 2 July 1996 |
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