Structure of oceanic crust adjacent to a transform margin segment: the Côte d’Ivoire–Ghana transform margin |
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| Authors: | F Sage B Pontoise J Mascle C Basile |
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| Institution: | (1) GEMCO URA-CNRS no. 718, Laboratoire de Géodynamique sous-marine, BP 48, 06230 Villefranche-sur-Mer, France, FR;(2) ORSTOM, UR 14, Laboratoire de Géodynamique sous-marine, BP 48, 06230 Villefranche-sur-Mer, France, FR;(3) URA-CNRS no. 69, Université de Grenoble I, Institut Dolomieu, 15 rue Maurice Gignoux, 38031 Grenoble Cédex, France, FR |
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| Abstract: | The structure of the oceanic crust adjacent to the Côte d’Ivoire–Ghana transform margin is deduced from multichannel seismic reflection and seismic wide-angle data, showing crustal heterogeneities within oceanic basement; the oceanic crust adjacent to the transform margin is half as thick as standard Atlantic oceanic crust. Refraction data indicate a gradual velocity transition towards typical mantle velocities. Such an abnormal oceanic crustal structure appears quite similar to crustal structures known along transform faults. This crustal thinning may be related to thermal effects of the nearby continental crust, on the oceanic accretion processes. We did not find geophysical evidence for oceanic crust contamination by continental lithosphere. |
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