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Email
Thilo Bechstädt (Info)
Rainer Zühlke (Info)
Phone
+49 6221 54-8292
+49 6221 54-6055
Fax
+49 6221 54-5503
Thilo Bechstädt (Info)
Rainer Zühlke (Info)
Phone
+49 6221 54-8292
+49 6221 54-6055
Fax
+49 6221 54-5503
Project Login
Quantitative Basin Development of the Eastern Central Atlantic Continental Margin (Permian-Oligocene, Agadir Basin, Morocco)Abstract & Detailed Project Description |
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| Scientists Rainer Zühlke, GeoResources and University of Heidelberg Brahim Ouajhain, University of El Jadida, Morocco Thilo Bechstädt, GeoResources and University of Heidelberg Reinhold Leinfelder, Museum of Natural History, Berlin |
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| Abstract | ||
| The study focuses on i) Integrated facies, bio- and sequence stratigraphic data for the late Permian to Eocene succession along a 120 km NE-SW trending basin transect (Im-n-Tanout to north of Agadir); ii) Numerical basin modeling (2D flexural modeling) and "Compositional Accommodation Analysis" (CA-Analysis) at the resolution of geologic stages (3-12 My) Basin stages: 1) initial rift: late Permian to late Anisian; 2) rift climax: Ladinian to late Carnian; 3) sag: Norian to Late Carixian; 4) early drift: Domerian to late Tithonian; 5) mature drift: Berriasian to Cenomanian; 6) mature drift with initial Atlasian compression: Turonian to late Eocene; 7) Atlasian deformation: late Eocene to early Miocene; 8) Atlasian uplift, basin inversion: since early Miocene. Eight subsidence trends with durations of 10-35 My on the Central Atlantic continental shelf were controlled by positive and negative feedback processes between thermo-tectonic subsidence, sediment flux and flexural-/compaction induced subsidence. Subsidence trends on the NW-African continental shelf were controlled by major plate-tectonic reconfigurations in the Central and North Atlantic domain: 1) Early Pliensbachian to Cenomanian: changes in sea floor spreading halfrates, shifts in spreading centers, pulses of northward migration of sea floor spreading; 2) Turonian to recent. African-Eurasian plate convergence. The explanation of typical stratigraphic sequences as caused predominantly by sea-level fluctuations, and rough assumptions on sediment input/production and subsidence, is not necessarily applicable to passive continental margins. The methodology applied in this study, including the newly developed tool of “Compositional Accommodation Analysis” (CA-Analysis), allows to develop more rigorous genetic models for the development of continental shelf basins. |
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