A geological field trip to the Cote d'Ivoire-Ghana transform margin
Mascle, J., Jean; Guiraud, M.; Benkhelil, J.; Basile, Ch., Christophe; Bouillin, J.-P.; Mascle, G.; Cousin, M.; Durand, M.; Dejax, J.; Moullade, M. (1998). A geological field trip to the Cote d'Ivoire-Ghana transform margin. Oceanol. Acta 21(1): 1-20
In: Oceanologica Acta. Elsevier/Gauthier-Villars: Montreuil. ISSN 0399-1784; e-ISSN 1878-4143, more
|  |
| Keywords |
Analysis > Sediment analysis
Cote d'Ivoire
Deltaic deposits
Earth sciences > Geology
Ghana
Palaeo studies
Rift zones
Sedimentation
Sediments
Topographic features > Submarine features > Continental margins
Ghana [Marine Regions]; Ivorian Exclusive Economic Zone [Marine Regions]
Marine/Coastal |
| Authors | | Top |
- Mascle, J.
- Guiraud, M.
- Benkhelil, J.
- Basile, Ch.
|
- Bouillin, J.-P.
- Mascle, G.
- Cousin, M.
|
- Durand, M.
- Dejax, J.
- Moullade, M.
|
| Abstract |
During the Equanaute survey (June 1992), fourteen submersible dives were performed between 4950 and 2250 m water depths across the southern slope of the Cote d'Ivoire-Ghana Marginal Ridge (CIGMR), in the eastern Equatorial Atlantic. The CIGMR, a high-standing topographic marginal ridge along the Cote d'Ivoire-Ghana transform margin, is beleived to result from a complex structural evolution due to the specific wrench-related rifting between Western Equatorial Africa and Northeastern Brazil, in Early Cretaceous times. In this paper we report and discuss geological observations made during dives, and sample analyses to resolve the lithology, paleoenvironmental conditions, age and origine of the CIGMR. The data help in better characterizing the different sedimentary and tectonic regimes which successively prevailed during the CIGMR formation and assessing the thermal regime operative during the fabrication and subsequent evolution of the margin. The thick sedimentary pile exposed along the southern CIGMR slope is made up of a repetitive clastic sequence indicative of a deltaicto-prodeltaic environment. This sedimentary pile, of Early Cretaceous age, has recorded different stages of the transform margin structural evolution. |
|
