Tectonic history along the South Gabon Basin: Anomalous early post-rift subsidence

Type Article
Date 2007-03
Language English
Author(s) Dupre StephanieORCID1, Bertotti Giovanni1, Cloetingh Sierd1
Affiliation(s) 1 : Vrije Univ Amsterdam, Fac Earth & Life Sci, Tect & Struct Geol Dept, NL-1081 HV Amsterdam, Netherlands.
Source Marine And Petroleum Geology (0264-8172) (Elsevier Sci Ltd), 2007-03 , Vol. 24 , N. 3 , P. 151-172
DOI 10.1016/j.marpetgeo.2006.11.003
WOS© Times Cited 32
Keyword(s) post-rift subsidence, margin, Gabon
Abstract 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 post-rift subsidence patterns can be related to a high thermal anomaly during the early rifting thermal state of the lithosphere. These findings are highly relevant for petroleum system studies and have implications for hydrocarbon generation.
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