The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact

The Ordovician of North and West Africa comprises three main transgressive–regressive sequences understood as ‘second-order’ cycles of 10–15 myr duration. Tide- to wave-dominated shallow-marine clastic successions, preserving incidental bryozoan carbonates to the north, include fluvial deposits over...

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Autores: Ghienne, Jean-François, Abdallah, Hussein, Deschamps, Rémy, Guiraud,Michel, Gutiérrez Marco, Juan Carlos, Konaté, Moussa, Meinhold, Guido, Moussa, Abderamane, Rubino, Jean-Loup
Tipo de recurso: capítulo de libro
Fecha de publicación:2023
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/88415
Acceso en línea:https://hdl.handle.net/20.500.14352/88415
Access Level:acceso abierto
Palabra clave:551.733.1(6)
Geología estratigráfica
2506.19 Estratigrafía
2506.01 Geología Regional
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spelling The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impactGhienne, Jean-FrançoisAbdallah, HusseinDeschamps, RémyGuiraud,MichelGutiérrez Marco, Juan CarlosKonaté, MoussaMeinhold, GuidoMoussa, AbderamaneRubino, Jean-Loup551.733.1(6)Geología estratigráfica2506.19 Estratigrafía2506.01 Geología RegionalThe Ordovician of North and West Africa comprises three main transgressive–regressive sequences understood as ‘second-order’ cycles of 10–15 myr duration. Tide- to wave-dominated shallow-marine clastic successions, preserving incidental bryozoan carbonates to the north, include fluvial deposits over the most proximal southern stretches of the platform. The boundary with Cambrian strata remains unclear but the latter are progressively less represented to the south in the undifferentiated ‘Cambro-Ordovician’. To the north, graptolites, brachiopods and trilobites combined with palynomorphs provide a robust biostratigraphic frame. Maximum flooding intervals occurred in the early to middle Tremadocian, middle Darriwilian and middle to late Katian. Two events interfered with an overall long-term transgressive trend. The ‘intra-Arenig’ (late Floian?) tectonic event highlighted palaeohighs coinciding with Paleoproterozoic basements. Gondwanan drainage basins were reorganized, which had an impact on sediment sourcing and distribution of detrital material (e.g. zircons) feeding the pre-Variscan Europe. The second event is the end-Ordovician glaciation. The domain supported the greatest part of the Hirnantian glaciers and may also have preserved pre-Hirnantian glacial archives. It is not until the very latest Ordovician that offshore conditions developed far inland; it is however suspected that this inundation benefited from a transient postglacial isostatic flexure.Geological SocietyServais,T.Harper, D. A. T.Lefebvre, B.Percival, I. G.Universidad Complutense de Madrid20232023-02-1020232023-02-10book parthttp://purl.org/coar/resource_type/c_3248VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/bookPartapplication/pdfhttps://hdl.handle.net/20.500.14352/88415reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/884152026-06-02T12:44:21Z
dc.title.none.fl_str_mv The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
title The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
spellingShingle The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
Ghienne, Jean-François
551.733.1(6)
Geología estratigráfica
2506.19 Estratigrafía
2506.01 Geología Regional
title_short The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
title_full The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
title_fullStr The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
title_full_unstemmed The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
title_sort The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact
dc.creator.none.fl_str_mv Ghienne, Jean-François
Abdallah, Hussein
Deschamps, Rémy
Guiraud,Michel
Gutiérrez Marco, Juan Carlos
Konaté, Moussa
Meinhold, Guido
Moussa, Abderamane
Rubino, Jean-Loup
author Ghienne, Jean-François
author_facet Ghienne, Jean-François
Abdallah, Hussein
Deschamps, Rémy
Guiraud,Michel
Gutiérrez Marco, Juan Carlos
Konaté, Moussa
Meinhold, Guido
Moussa, Abderamane
Rubino, Jean-Loup
author_role author
author2 Abdallah, Hussein
Deschamps, Rémy
Guiraud,Michel
Gutiérrez Marco, Juan Carlos
Konaté, Moussa
Meinhold, Guido
Moussa, Abderamane
Rubino, Jean-Loup
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Servais,T.
Harper, D. A. T.
Lefebvre, B.
Percival, I. G.
Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.733.1(6)
Geología estratigráfica
2506.19 Estratigrafía
2506.01 Geología Regional
topic 551.733.1(6)
Geología estratigráfica
2506.19 Estratigrafía
2506.01 Geología Regional
description The Ordovician of North and West Africa comprises three main transgressive–regressive sequences understood as ‘second-order’ cycles of 10–15 myr duration. Tide- to wave-dominated shallow-marine clastic successions, preserving incidental bryozoan carbonates to the north, include fluvial deposits over the most proximal southern stretches of the platform. The boundary with Cambrian strata remains unclear but the latter are progressively less represented to the south in the undifferentiated ‘Cambro-Ordovician’. To the north, graptolites, brachiopods and trilobites combined with palynomorphs provide a robust biostratigraphic frame. Maximum flooding intervals occurred in the early to middle Tremadocian, middle Darriwilian and middle to late Katian. Two events interfered with an overall long-term transgressive trend. The ‘intra-Arenig’ (late Floian?) tectonic event highlighted palaeohighs coinciding with Paleoproterozoic basements. Gondwanan drainage basins were reorganized, which had an impact on sediment sourcing and distribution of detrital material (e.g. zircons) feeding the pre-Variscan Europe. The second event is the end-Ordovician glaciation. The domain supported the greatest part of the Hirnantian glaciers and may also have preserved pre-Hirnantian glacial archives. It is not until the very latest Ordovician that offshore conditions developed far inland; it is however suspected that this inundation benefited from a transient postglacial isostatic flexure.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-02-10
2023
2023-02-10
dc.type.none.fl_str_mv book part
http://purl.org/coar/resource_type/c_3248
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format bookPart
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/88415
url https://hdl.handle.net/20.500.14352/88415
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Geological Society
publisher.none.fl_str_mv Geological Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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