Structure of the Gabon Margin from integrated seismic reflection and gravity data
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...
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ftvuamstcris:oai:research.vu.nl:publications/f00b211f-49c3-4423-bc23-fdbc71539de2 2024-04-28T08:31:40+00:00 Structure of the Gabon Margin from integrated seismic reflection and gravity data Dupre, S. Cloetingh, S.A.P.L. Bertotti, G.V. 2011 https://research.vu.nl/en/publications/f00b211f-49c3-4423-bc23-fdbc71539de2 https://doi.org/10.1016/j.tecto.2011.04.009 eng eng https://research.vu.nl/en/publications/f00b211f-49c3-4423-bc23-fdbc71539de2 info:eu-repo/semantics/closedAccess Dupre , S , Cloetingh , S A P L & Bertotti , G V 2011 , ' Structure of the Gabon Margin from integrated seismic reflection and gravity data ' , Tectonophysics . https://doi.org/10.1016/j.tecto.2011.04.009 /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2011 ftvuamstcris https://doi.org/10.1016/j.tecto.2011.04.009 2024-04-09T02:48:41Z 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 to a relatively sharp and narrow transition, along a few tens of kilometers, between the unthinned and the thinned continental crust. The high density layer identified offshore Gabon presents similar characteristics in density, geometry and spatial distribution, as the underplated magmatic bodies observed along volcanic margins, e.g. along the South Atlantic Namibia Margin or the North Atlantic Vøring Margin. Although this lower crustal body could possibly represent ultra mafic serpentinized rocks or high grade metamorphic crustal rocks, we suggest that it could be composed of mafic rocks. Magmas resulting from partial melting during rifting may underplate the crust and/or be intruded in the lower crust through a system of dykes and sills. In this view, the present-day crustal thicknesses along rifted margins, characterized by magmatic underplating and/or intrusion, are not representative of the thinning that the crust experienced during rifting. Results of this study point to relatively shallow sedimentary basins along the South Gabon Margin. The deepest offshore depocenters located under the westernmost side of the continental platform appear to be associated with the deepest syn-rift basins These basins seem to extend along 20 to 40 km in the ~. NE-SW ... Article in Journal/Newspaper North Atlantic Vrije Universiteit Amsterdam (VU): Research Portal Tectonophysics 506 1-4 31 45 |
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Vrije Universiteit Amsterdam (VU): Research Portal |
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ftvuamstcris |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Dupre, S. Cloetingh, S.A.P.L. Bertotti, G.V. Structure of the Gabon Margin from integrated seismic reflection and gravity data |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
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 to a relatively sharp and narrow transition, along a few tens of kilometers, between the unthinned and the thinned continental crust. The high density layer identified offshore Gabon presents similar characteristics in density, geometry and spatial distribution, as the underplated magmatic bodies observed along volcanic margins, e.g. along the South Atlantic Namibia Margin or the North Atlantic Vøring Margin. Although this lower crustal body could possibly represent ultra mafic serpentinized rocks or high grade metamorphic crustal rocks, we suggest that it could be composed of mafic rocks. Magmas resulting from partial melting during rifting may underplate the crust and/or be intruded in the lower crust through a system of dykes and sills. In this view, the present-day crustal thicknesses along rifted margins, characterized by magmatic underplating and/or intrusion, are not representative of the thinning that the crust experienced during rifting. Results of this study point to relatively shallow sedimentary basins along the South Gabon Margin. The deepest offshore depocenters located under the westernmost side of the continental platform appear to be associated with the deepest syn-rift basins These basins seem to extend along 20 to 40 km in the ~. NE-SW ... |
format |
Article in Journal/Newspaper |
author |
Dupre, S. Cloetingh, S.A.P.L. Bertotti, G.V. |
author_facet |
Dupre, S. Cloetingh, S.A.P.L. Bertotti, G.V. |
author_sort |
Dupre, S. |
title |
Structure of the Gabon Margin from integrated seismic reflection and gravity data |
title_short |
Structure of the Gabon Margin from integrated seismic reflection and gravity data |
title_full |
Structure of the Gabon Margin from integrated seismic reflection and gravity data |
title_fullStr |
Structure of the Gabon Margin from integrated seismic reflection and gravity data |
title_full_unstemmed |
Structure of the Gabon Margin from integrated seismic reflection and gravity data |
title_sort |
structure of the gabon margin from integrated seismic reflection and gravity data |
publishDate |
2011 |
url |
https://research.vu.nl/en/publications/f00b211f-49c3-4423-bc23-fdbc71539de2 https://doi.org/10.1016/j.tecto.2011.04.009 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Dupre , S , Cloetingh , S A P L & Bertotti , G V 2011 , ' Structure of the Gabon Margin from integrated seismic reflection and gravity data ' , Tectonophysics . https://doi.org/10.1016/j.tecto.2011.04.009 |
op_relation |
https://research.vu.nl/en/publications/f00b211f-49c3-4423-bc23-fdbc71539de2 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.tecto.2011.04.009 |
container_title |
Tectonophysics |
container_volume |
506 |
container_issue |
1-4 |
container_start_page |
31 |
op_container_end_page |
45 |
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1797589107407323136 |