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| Dupre, Stephanie; Cloetingh, Sierd; Bertotti, Giovanni. |
| In the South Gabon Basin, deep multi-channel seismic reflection and gravity modeling analysis have shed light on key features of the structure of the margin. The thinned continental crust beneath the Gabon Margin appears to be composed of two distinct layers, separated by a clear, strong and more or less continuous reflector running in the 7–10 s TWT window. The lower crust is characterized by a higher density, intermediate between the lower values of the upper crust and the denser values of the mantle. The lower crust is irregularly shaped and presents lateral thickness variations along the direction of thinning and along the coast. In the offshore thinned continental domain, the lower and upper crust form a 20–25 km thick body. Crustal thicknesses point... |
| Tipo: Text |
Palavras-chave: Deep seismic; Gravity modeling; Crustal structure; Rifted continental margins; Lower crust; Gabon Margin. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00039/15020/12347.pdf |
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| Dupre, Stephanie; Bertotti, Giovanni; Cloetingh, Sierd. |
| An integrated study of the South Gabon Margin (South Atlantic) based on reflection seismic and well data has been performed to quantify tectonic activity. A regional profile crossing the entire basin together with subsidence analysis, highlights important aspects of the post-rift history. The most striking event in the margin evolution appears to be the anomalous extra subsidence during the early post-rift period characterized by high sedimentation rates, equivalent to one third of the syn-rift subsidence. Although the presence of evaporite layers restricts knowledge of the underlying structures essentially composed of pre-rift and syn-rift sequences, the outcome of this post-rift tectonic study has strong implications for the rifting history. The early... |
| Tipo: Text |
Palavras-chave: Post-rift subsidence; Margin; Gabon. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-6803.pdf |
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