Structural control on present-day topography of a basement massif

The Anti-Atlas basement massif extends South of the High Atlas, and, despite a very mild Cenozoic deformation, its altitude exceeds 1500m in large areas, reaching 3305m in Jbel Sirwa. Structural contours of the present elevation of a polygenic planation surface (the High Erosional surface) and of th...

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Autores: Gimerà, Joan, Arboleya, María Luisa|||0000-0002-9700-5566, Teixell, Antonio|||0000-0002-7423-6361
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:85178
Acceso en línea:https://ddd.uab.cat/record/85178
https://dx.doi.org/urn:doi:10.1344/105.000001643
Access Level:acceso abierto
Palabra clave:Cenozoic contraction
Crustal folding
Tectonic topography
Anti-Atlas
Morocco
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spelling Structural control on present-day topography of a basement massifthe Central and Eastern Anti-Atlas (Morocco)Gimerà, JoanArboleya, María Luisa|||0000-0002-9700-5566Teixell, Antonio|||0000-0002-7423-6361Cenozoic contractionCrustal foldingTectonic topographyAnti-AtlasMoroccoThe Anti-Atlas basement massif extends South of the High Atlas, and, despite a very mild Cenozoic deformation, its altitude exceeds 1500m in large areas, reaching 3305m in Jbel Sirwa. Structural contours of the present elevation of a polygenic planation surface (the High Erosional surface) and of the base of Cretaceous and Neogene inliers have been performed to characterize the major tectonic structures. Gentle Cenozoic WSW-ENE- and N-Strending folds, of 60 to100km wavelength, reactivate Variscan structures, being the major contributors to the local topography of the Anti-Atlas. Reactivated thrusts of decakilometric to kilometric-scale and E-W trend involving the Neogene rocks exhibit a steep attitude and a small displacement, but they also produce a marked topographic expression. The resulting Cenozoic horizontal shortening along N-S sections across the Anti-Atlas is about 1%. The position of the major anticlinal hinges determines the location of the fluvial divides of the Warzazat basin and the Anti-Atlas, and a structural depression on one of these hinges (Jbel Saghro anticline) allowed the formerly endorheic Warzazat basin to drain southwards. The first Cenozoic structures generating local topography are of pre-mid Miocene age (postdated by 6.7Ma volcanic rocks at the Jbel Saghro), whereas the youngest thrust movements postdate the Pliocene sedimentary and volcanic rocks (involving 2.1Ma volcanic rocks at Jbel Sirwa). In addition to these features, the mean elevation of the Anti-Atlas at the regional scale is also the result of a mantle thermal anomaly reported in previous works for the entire Atlas system. 22011-01-0120112011-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/85178https://dx.doi.org/urn:doi:10.1344/105.000001643reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:851782026-06-06T12:50:31Z
dc.title.none.fl_str_mv Structural control on present-day topography of a basement massif
the Central and Eastern Anti-Atlas (Morocco)
title Structural control on present-day topography of a basement massif
spellingShingle Structural control on present-day topography of a basement massif
Gimerà, Joan
Cenozoic contraction
Crustal folding
Tectonic topography
Anti-Atlas
Morocco
title_short Structural control on present-day topography of a basement massif
title_full Structural control on present-day topography of a basement massif
title_fullStr Structural control on present-day topography of a basement massif
title_full_unstemmed Structural control on present-day topography of a basement massif
title_sort Structural control on present-day topography of a basement massif
dc.creator.none.fl_str_mv Gimerà, Joan
Arboleya, María Luisa|||0000-0002-9700-5566
Teixell, Antonio|||0000-0002-7423-6361
author Gimerà, Joan
author_facet Gimerà, Joan
Arboleya, María Luisa|||0000-0002-9700-5566
Teixell, Antonio|||0000-0002-7423-6361
author_role author
author2 Arboleya, María Luisa|||0000-0002-9700-5566
Teixell, Antonio|||0000-0002-7423-6361
author2_role author
author
dc.subject.none.fl_str_mv Cenozoic contraction
Crustal folding
Tectonic topography
Anti-Atlas
Morocco
topic Cenozoic contraction
Crustal folding
Tectonic topography
Anti-Atlas
Morocco
description The Anti-Atlas basement massif extends South of the High Atlas, and, despite a very mild Cenozoic deformation, its altitude exceeds 1500m in large areas, reaching 3305m in Jbel Sirwa. Structural contours of the present elevation of a polygenic planation surface (the High Erosional surface) and of the base of Cretaceous and Neogene inliers have been performed to characterize the major tectonic structures. Gentle Cenozoic WSW-ENE- and N-Strending folds, of 60 to100km wavelength, reactivate Variscan structures, being the major contributors to the local topography of the Anti-Atlas. Reactivated thrusts of decakilometric to kilometric-scale and E-W trend involving the Neogene rocks exhibit a steep attitude and a small displacement, but they also produce a marked topographic expression. The resulting Cenozoic horizontal shortening along N-S sections across the Anti-Atlas is about 1%. The position of the major anticlinal hinges determines the location of the fluvial divides of the Warzazat basin and the Anti-Atlas, and a structural depression on one of these hinges (Jbel Saghro anticline) allowed the formerly endorheic Warzazat basin to drain southwards. The first Cenozoic structures generating local topography are of pre-mid Miocene age (postdated by 6.7Ma volcanic rocks at the Jbel Saghro), whereas the youngest thrust movements postdate the Pliocene sedimentary and volcanic rocks (involving 2.1Ma volcanic rocks at Jbel Sirwa). In addition to these features, the mean elevation of the Anti-Atlas at the regional scale is also the result of a mantle thermal anomaly reported in previous works for the entire Atlas system.
publishDate 2011
dc.date.none.fl_str_mv 2
2011-01-01
2011
2011-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/85178
https://dx.doi.org/urn:doi:10.1344/105.000001643
url https://ddd.uab.cat/record/85178
https://dx.doi.org/urn:doi:10.1344/105.000001643
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
https://rightsstatements.org/vocab/InC/1.0/
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
https://rightsstatements.org/vocab/InC/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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