Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications
The geodynamic processes that control the opening of the central segment of the South Atlantic Ocean (between the Walvis Ridge and the Ascension FZ) are debated. In this paper, we discuss the timing of the sedimentary and tectonic evolution of the Early Cretaceous rift by drawing eight paleogeograph...
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fttriple:oai:gotriple.eu:10670/1.ndzt9f 2023-05-15T18:21:16+02:00 Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications Chaboureau, Anne-claire Guillocheau, Francois Robin, Cecile Rohais, Sebastien Moulin, Maryline Aslanian, Daniel https://doi.org/10.1016/j.tecto.2012.08.025 https://archimer.ifremer.fr/doc/00149/26057/88184.pdf https://archimer.ifremer.fr/doc/00149/26057/ en eng Elsevier Science Bv doi:10.1016/j.tecto.2012.08.025 10670/1.ndzt9f https://archimer.ifremer.fr/doc/00149/26057/88184.pdf https://archimer.ifremer.fr/doc/00149/26057/ other Archimer, archive institutionnelle de l'Ifremer Tectonophysics (0040-1951) (Elsevier Science Bv), 2013-09 , Vol. 604 , P. 191-223 geo archeo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.tecto.2012.08.025 2023-01-22T17:24:46Z The geodynamic processes that control the opening of the central segment of the South Atlantic Ocean (between the Walvis Ridge and the Ascension FZ) are debated. In this paper, we discuss the timing of the sedimentary and tectonic evolution of the Early Cretaceous rift by drawing eight paleogeographic and geodynamic maps from the Berriasian to the Middle–Late Aptian, based on a biostratigraphic (ostracodes and pollen) chart recalibrated on absolute ages (chemostratigraphy, interstratified volcanics, Re–Os dating of the organic matter). The central segment of the South Atlantic is composed of two domains, with a two phases evolution of the pre-drift (“rifting”) times: a rift phase characterized by tilted blocks and growth strata, followed by a sag basin. The southern domain includes the Namibe, Santos and Campos Basins. The northern domain extends from the Espirito Santo and North Kwanza Basins, in the south, to the Sergipe–Alagoas and North Gabon Basins to the north. Extension started in the northern domain during the Late Berriasian (Congo–Camamu Basin to the Sergipe–Alagoas–North Gabon Basins) and migrated southward. At that time, the southern domain was not a subsiding domain (emplacement of the Parana–Etendeka Trapp). Extension started in this southern domain during the Early Barremian. The rift phase is shorter in the south (5–6 Ma, Barremian to base Aptian) than in the north (19 to 20 Myr, Upper Berriasian to base Aptian). The sag phase is of Middle to Late Aptian age. In the northern domain, this transition corresponds to a hiatus of Early to Middle Aptian age. From the Late Berriasian to base Aptian, the northern domain evolves from a deep lake with lateral highs to a shallower organic-rich one with no more highs. The lake migrates southward in two steps, until the Valanginian at the border between the northern and southern domains, until the Early Barremian, north of Walvis Ridge. Text South Atlantic Ocean Unknown Tectonophysics 604 191 223 |
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English |
topic |
geo archeo |
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geo archeo Chaboureau, Anne-claire Guillocheau, Francois Robin, Cecile Rohais, Sebastien Moulin, Maryline Aslanian, Daniel Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
topic_facet |
geo archeo |
description |
The geodynamic processes that control the opening of the central segment of the South Atlantic Ocean (between the Walvis Ridge and the Ascension FZ) are debated. In this paper, we discuss the timing of the sedimentary and tectonic evolution of the Early Cretaceous rift by drawing eight paleogeographic and geodynamic maps from the Berriasian to the Middle–Late Aptian, based on a biostratigraphic (ostracodes and pollen) chart recalibrated on absolute ages (chemostratigraphy, interstratified volcanics, Re–Os dating of the organic matter). The central segment of the South Atlantic is composed of two domains, with a two phases evolution of the pre-drift (“rifting”) times: a rift phase characterized by tilted blocks and growth strata, followed by a sag basin. The southern domain includes the Namibe, Santos and Campos Basins. The northern domain extends from the Espirito Santo and North Kwanza Basins, in the south, to the Sergipe–Alagoas and North Gabon Basins to the north. Extension started in the northern domain during the Late Berriasian (Congo–Camamu Basin to the Sergipe–Alagoas–North Gabon Basins) and migrated southward. At that time, the southern domain was not a subsiding domain (emplacement of the Parana–Etendeka Trapp). Extension started in this southern domain during the Early Barremian. The rift phase is shorter in the south (5–6 Ma, Barremian to base Aptian) than in the north (19 to 20 Myr, Upper Berriasian to base Aptian). The sag phase is of Middle to Late Aptian age. In the northern domain, this transition corresponds to a hiatus of Early to Middle Aptian age. From the Late Berriasian to base Aptian, the northern domain evolves from a deep lake with lateral highs to a shallower organic-rich one with no more highs. The lake migrates southward in two steps, until the Valanginian at the border between the northern and southern domains, until the Early Barremian, north of Walvis Ridge. |
format |
Text |
author |
Chaboureau, Anne-claire Guillocheau, Francois Robin, Cecile Rohais, Sebastien Moulin, Maryline Aslanian, Daniel |
author_facet |
Chaboureau, Anne-claire Guillocheau, Francois Robin, Cecile Rohais, Sebastien Moulin, Maryline Aslanian, Daniel |
author_sort |
Chaboureau, Anne-claire |
title |
Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
title_short |
Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
title_full |
Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
title_fullStr |
Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
title_full_unstemmed |
Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
title_sort |
paleogeographic evolution of the central segment of the south atlantic during early cretaceous times: paleotopographic and geodynamic implications |
publisher |
Elsevier Science Bv |
url |
https://doi.org/10.1016/j.tecto.2012.08.025 https://archimer.ifremer.fr/doc/00149/26057/88184.pdf https://archimer.ifremer.fr/doc/00149/26057/ |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Tectonophysics (0040-1951) (Elsevier Science Bv), 2013-09 , Vol. 604 , P. 191-223 |
op_relation |
doi:10.1016/j.tecto.2012.08.025 10670/1.ndzt9f https://archimer.ifremer.fr/doc/00149/26057/88184.pdf https://archimer.ifremer.fr/doc/00149/26057/ |
op_rights |
other |
op_doi |
https://doi.org/10.1016/j.tecto.2012.08.025 |
container_title |
Tectonophysics |
container_volume |
604 |
container_start_page |
191 |
op_container_end_page |
223 |
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1766200443978907648 |