Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean
International audience The evolution of the North-Atlantic Ocean from its rifting stage during the Upper Jurassic until the present-day passive margin is recorded by the sedimentary wedge of eastern French-Atlantic platform. The study of a dense network of high resolution seismic profiles on the Ven...
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ftunivrennes1hal:oai:HAL:hal-00537046v1 2024-05-19T07:44:50+00:00 Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean Huerta, Pedro Proust, Jean-Noël Guennoc, Pol Thinon, Isabelle Departamento de Geología Salamanca Universidad de Salamanca Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) Bureau de Recherches Géologiques et Minières (BRGM) 2010 https://brgm.hal.science/hal-00537046 en eng HAL CCSD Société géologique de France - EDP Sciences hal-00537046 https://brgm.hal.science/hal-00537046 ISSN: 0037-9409 EISSN: 1777-5817 Bulletin de la Société Géologique de France https://brgm.hal.science/hal-00537046 Bulletin de la Société Géologique de France, 2010, 181 (1), p. 37-50 Vendée Aquitaine platform Stratigraphy Sedimentology Fluvial valleys Tectonic activities [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2010 ftunivrennes1hal 2024-05-01T23:53:35Z International audience The evolution of the North-Atlantic Ocean from its rifting stage during the Upper Jurassic until the present-day passive margin is recorded by the sedimentary wedge of eastern French-Atlantic platform. The study of a dense network of high resolution seismic profiles on the Vendean-Armorican platform (VAP) obtained during INSU-CNRS cruise "Geovend", led to the characterization of the architecture of the sediment wedge preserved between the coast and Armorican margin shelf edge. This sediment wedge lies on a substratum composed of metamorphic and magmatic rocks of Palaeozoic age (Ub). The sediment wedge comprises six seismic units (U1-U6) bounded by regional unconformities: Jurassic marine succession (U1), Upper Cretaceous marine rocks (U2), Eocene-Oligocene marine deposits of the incipient VAP (U3), Miocene (U4) and Plio-Quaternary (U5) marine deposits overlain by the last sea-level rise ravinement deposits (U6). Above the basal unconformity at the top of Ub, the units are bounded by angular unconformities (top of U1, U2, U3), truncation with channel incision (top U4) or planar marine ravinement (top of U5) surfaces. Most of these unconformities are due to the tectonic activity of the bay of Biscay during the Mesozoic including (1) the North Atlantic rifting during the Jurassic to Early Cretaceous, (2) the propagation of the ocean crust and counterclockwise rotation of the Iberian block during the Aptian-Albian to Coniacian (magnetic anomaly 33-34) producing troughs at the top of U1 filled by downlapping U2 sediment wedges, (3) the Alpine compression at the origin of folding and faulting and the unconformable deposition of U3, and (4) the late compressive deformation during the Miocene that affected U4. The VAP acquires its actual configuration during U4. Sedimentation on the platform was then affected by climatically-controlled relative sea-level changes (U5 to U6) that forced U5 shelf margin sediment deposition above an incised unconformity and subsequently overlain by U6 transgressive ... Article in Journal/Newspaper North Atlantic Université de Rennes 1: Publications scientifiques (HAL) |
institution |
Open Polar |
collection |
Université de Rennes 1: Publications scientifiques (HAL) |
op_collection_id |
ftunivrennes1hal |
language |
English |
topic |
Vendée Aquitaine platform Stratigraphy Sedimentology Fluvial valleys Tectonic activities [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Vendée Aquitaine platform Stratigraphy Sedimentology Fluvial valleys Tectonic activities [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Huerta, Pedro Proust, Jean-Noël Guennoc, Pol Thinon, Isabelle Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean |
topic_facet |
Vendée Aquitaine platform Stratigraphy Sedimentology Fluvial valleys Tectonic activities [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The evolution of the North-Atlantic Ocean from its rifting stage during the Upper Jurassic until the present-day passive margin is recorded by the sedimentary wedge of eastern French-Atlantic platform. The study of a dense network of high resolution seismic profiles on the Vendean-Armorican platform (VAP) obtained during INSU-CNRS cruise "Geovend", led to the characterization of the architecture of the sediment wedge preserved between the coast and Armorican margin shelf edge. This sediment wedge lies on a substratum composed of metamorphic and magmatic rocks of Palaeozoic age (Ub). The sediment wedge comprises six seismic units (U1-U6) bounded by regional unconformities: Jurassic marine succession (U1), Upper Cretaceous marine rocks (U2), Eocene-Oligocene marine deposits of the incipient VAP (U3), Miocene (U4) and Plio-Quaternary (U5) marine deposits overlain by the last sea-level rise ravinement deposits (U6). Above the basal unconformity at the top of Ub, the units are bounded by angular unconformities (top of U1, U2, U3), truncation with channel incision (top U4) or planar marine ravinement (top of U5) surfaces. Most of these unconformities are due to the tectonic activity of the bay of Biscay during the Mesozoic including (1) the North Atlantic rifting during the Jurassic to Early Cretaceous, (2) the propagation of the ocean crust and counterclockwise rotation of the Iberian block during the Aptian-Albian to Coniacian (magnetic anomaly 33-34) producing troughs at the top of U1 filled by downlapping U2 sediment wedges, (3) the Alpine compression at the origin of folding and faulting and the unconformable deposition of U3, and (4) the late compressive deformation during the Miocene that affected U4. The VAP acquires its actual configuration during U4. Sedimentation on the platform was then affected by climatically-controlled relative sea-level changes (U5 to U6) that forced U5 shelf margin sediment deposition above an incised unconformity and subsequently overlain by U6 transgressive ... |
author2 |
Departamento de Geología Salamanca Universidad de Salamanca Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) Bureau de Recherches Géologiques et Minières (BRGM) |
format |
Article in Journal/Newspaper |
author |
Huerta, Pedro Proust, Jean-Noël Guennoc, Pol Thinon, Isabelle |
author_facet |
Huerta, Pedro Proust, Jean-Noël Guennoc, Pol Thinon, Isabelle |
author_sort |
Huerta, Pedro |
title |
Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean |
title_short |
Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean |
title_full |
Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean |
title_fullStr |
Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean |
title_full_unstemmed |
Seismic stratigraphy of the Vendean-Armorican platform of the French Atlantic shelf: new insights into the history of the North Atlantic ocean |
title_sort |
seismic stratigraphy of the vendean-armorican platform of the french atlantic shelf: new insights into the history of the north atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://brgm.hal.science/hal-00537046 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0037-9409 EISSN: 1777-5817 Bulletin de la Société Géologique de France https://brgm.hal.science/hal-00537046 Bulletin de la Société Géologique de France, 2010, 181 (1), p. 37-50 |
op_relation |
hal-00537046 https://brgm.hal.science/hal-00537046 |
_version_ |
1799484721710759936 |