Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.

The Atlas Mountains in Morocco are considered as type examples of intracontinental chains, with high topography that contrasts with moderate crustal shortening and thickening. Whereas recent geological studies and geodynamic modeling have suggested the existence of dynamic topography to explain this...

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Detalhes bibliográficos
Autores: Ledo Fernández, Juanjo, Jones, Alan G., Siniscalchi, Agata, Campanyà, Joan, Kiyan, Duygu, Romano, Gerardo, Rouai, Mohamed, TopoMed MT Team
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2011
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/34587
Acesso em linha:https://hdl.handle.net/2445/34587
Access Level:acceso abierto
Palavra-chave:Tectònica
Gran Atles (Marroc : Serralada)
Tectonics
High Atlas Mountains (Morocco)
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spelling Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.Ledo Fernández, JuanjoJones, Alan G.Siniscalchi, AgataCampanyà, JoanKiyan, DuyguRomano, GerardoRouai, MohamedTopoMed MT TeamTectònicaGran Atles (Marroc : Serralada)TectonicsHigh Atlas Mountains (Morocco)The Atlas Mountains in Morocco are considered as type examples of intracontinental chains, with high topography that contrasts with moderate crustal shortening and thickening. Whereas recent geological studies and geodynamic modeling have suggested the existence of dynamic topography to explain this apparent contradiction, there is a lack of modern geophysical data at the crustal scale to corroborate this hypothesis. Newly-acquired magnetotelluric data image the electrical resistivity distribution of the crust from the Middle Atlas to the Anti-Atlas, crossing the tabular Moulouya Plain and the High Atlas. All the units show different and unique electrical signatures throughout the crust reflecting the tectonic history of development of each one. In the upper crust electrical resistivity values may be associated to sediment sequences in the Moulouya and Anti-Atlas and to crustal scale fault systems in the High Atlas developed during the Cenozoic times. In the lower crust the low resistivity anomaly found below the Mouluya plain, together with other geophysical (low velocity anomaly, lack of earthquakes and minimum Bouguer anomaly) and geochemical (Neogene-Quaternary intraplate alkaline volcanic fields) evidence, infer the existence of a small degree of partial melt at the base of the lower crust. The low resistivity anomaly found below the Anti-Atlas may be associated with a relict subduction of Precambrian oceanic sediments, or to precipitated minerals during the release of fluids from the mantle during the accretion of the Anti-Atlas to the West African Supercontinent during the Panafrican orogeny ca. 685 Ma).Elsevier B.V.2013201320112013info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion7 p.application/pdfhttps://hdl.handle.net/2445/34587Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: http://doi:10.1016/j.pepi.2011.01.008Physics of the Earth and Planetary Interiors, 2011, vol. 185, num. 3-4, p. 82-88http://dx.doi.org/10.1016/j.pepi.2011.01.008(c) Elsevier B.V., 2011info:eu-repo/semantics/openAccessoai:recercat.cat:2445/345872026-05-29T05:05:01Z
dc.title.none.fl_str_mv Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
title Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
spellingShingle Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
Ledo Fernández, Juanjo
Tectònica
Gran Atles (Marroc : Serralada)
Tectonics
High Atlas Mountains (Morocco)
title_short Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
title_full Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
title_fullStr Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
title_full_unstemmed Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
title_sort Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco.
dc.creator.none.fl_str_mv Ledo Fernández, Juanjo
Jones, Alan G.
Siniscalchi, Agata
Campanyà, Joan
Kiyan, Duygu
Romano, Gerardo
Rouai, Mohamed
TopoMed MT Team
author Ledo Fernández, Juanjo
author_facet Ledo Fernández, Juanjo
Jones, Alan G.
Siniscalchi, Agata
Campanyà, Joan
Kiyan, Duygu
Romano, Gerardo
Rouai, Mohamed
TopoMed MT Team
author_role author
author2 Jones, Alan G.
Siniscalchi, Agata
Campanyà, Joan
Kiyan, Duygu
Romano, Gerardo
Rouai, Mohamed
TopoMed MT Team
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Tectònica
Gran Atles (Marroc : Serralada)
Tectonics
High Atlas Mountains (Morocco)
topic Tectònica
Gran Atles (Marroc : Serralada)
Tectonics
High Atlas Mountains (Morocco)
description The Atlas Mountains in Morocco are considered as type examples of intracontinental chains, with high topography that contrasts with moderate crustal shortening and thickening. Whereas recent geological studies and geodynamic modeling have suggested the existence of dynamic topography to explain this apparent contradiction, there is a lack of modern geophysical data at the crustal scale to corroborate this hypothesis. Newly-acquired magnetotelluric data image the electrical resistivity distribution of the crust from the Middle Atlas to the Anti-Atlas, crossing the tabular Moulouya Plain and the High Atlas. All the units show different and unique electrical signatures throughout the crust reflecting the tectonic history of development of each one. In the upper crust electrical resistivity values may be associated to sediment sequences in the Moulouya and Anti-Atlas and to crustal scale fault systems in the High Atlas developed during the Cenozoic times. In the lower crust the low resistivity anomaly found below the Mouluya plain, together with other geophysical (low velocity anomaly, lack of earthquakes and minimum Bouguer anomaly) and geochemical (Neogene-Quaternary intraplate alkaline volcanic fields) evidence, infer the existence of a small degree of partial melt at the base of the lower crust. The low resistivity anomaly found below the Anti-Atlas may be associated with a relict subduction of Precambrian oceanic sediments, or to precipitated minerals during the release of fluids from the mantle during the accretion of the Anti-Atlas to the West African Supercontinent during the Panafrican orogeny ca. 685 Ma).
publishDate 2011
dc.date.none.fl_str_mv 2011
2013
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/34587
url https://hdl.handle.net/2445/34587
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: http://doi:10.1016/j.pepi.2011.01.008
Physics of the Earth and Planetary Interiors, 2011, vol. 185, num. 3-4, p. 82-88
http://dx.doi.org/10.1016/j.pepi.2011.01.008
dc.rights.none.fl_str_mv (c) Elsevier B.V., 2011
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier B.V., 2011
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 7 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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