Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications
International audience 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 draw...
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00904200 https://doi.org/10.1016/j.tecto.2012.08.025 |
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ftccsdartic:oai:HAL:insu-00904200v1 2023-05-15T18:21:03+02:00 Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications Chaboureau, Anne-Claire Guillocheau, François Robin, Cécile Rohais, Sébastien Moulin, Maryline Aslanian, Daniel Géosciences Rennes (GR) Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) Direction Géologie-Géochimie-Géophysique IFP Energies nouvelles (IFPEN) IFP Energies nouvelles (IFPEN)-IFP Energies nouvelles (IFPEN) Instituto Dom Luiz Universidade de Lisboa (ULISBOA) Unité de recherche Géosciences Marines (Ifremer) (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2013 https://hal-insu.archives-ouvertes.fr/insu-00904200 https://doi.org/10.1016/j.tecto.2012.08.025 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2012.08.025 insu-00904200 https://hal-insu.archives-ouvertes.fr/insu-00904200 doi:10.1016/j.tecto.2012.08.025 ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://hal-insu.archives-ouvertes.fr/insu-00904200 Tectonophysics, Elsevier, 2013, 604, pp.191-223. ⟨10.1016/j.tecto.2012.08.025⟩ Geodynamic Early Cretaceous Paleogeography Rift South Atlantic Ocean -- central segment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.1016/j.tecto.2012.08.025 2021-10-24T14:24:00Z International audience 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. Article in Journal/Newspaper South Atlantic Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Tectonophysics 604 191 223 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Geodynamic Early Cretaceous Paleogeography Rift South Atlantic Ocean -- central segment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Geodynamic Early Cretaceous Paleogeography Rift South Atlantic Ocean -- central segment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Chaboureau, Anne-Claire Guillocheau, François Robin, Cécile Rohais, Sébastien Moulin, Maryline Aslanian, Daniel Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications |
topic_facet |
Geodynamic Early Cretaceous Paleogeography Rift South Atlantic Ocean -- central segment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Géosciences Rennes (GR) Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) Direction Géologie-Géochimie-Géophysique IFP Energies nouvelles (IFPEN) IFP Energies nouvelles (IFPEN)-IFP Energies nouvelles (IFPEN) Instituto Dom Luiz Universidade de Lisboa (ULISBOA) Unité de recherche Géosciences Marines (Ifremer) (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Chaboureau, Anne-Claire Guillocheau, François Robin, Cécile Rohais, Sébastien Moulin, Maryline Aslanian, Daniel |
author_facet |
Chaboureau, Anne-Claire Guillocheau, François Robin, Cécile Rohais, Sébastien 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 |
HAL CCSD |
publishDate |
2013 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00904200 https://doi.org/10.1016/j.tecto.2012.08.025 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://hal-insu.archives-ouvertes.fr/insu-00904200 Tectonophysics, Elsevier, 2013, 604, pp.191-223. ⟨10.1016/j.tecto.2012.08.025⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2012.08.025 insu-00904200 https://hal-insu.archives-ouvertes.fr/insu-00904200 doi:10.1016/j.tecto.2012.08.025 |
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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1766200108435636224 |