Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees

The activity of normal faults in the Central-Western Pyrenees is mainly detected by the disruption of paleic landforms surviving to Plio-Quaternary incision: the remnants of a Low-Relief Topography (LRT) that probably originated asynchronically during the Oligocene and Miocene. We propose a new meth...

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Detalles Bibliográficos
Autores: Ortuño Candela, Maria, Vilaplana, Miquel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/163421
Acceso en línea:https://hdl.handle.net/2445/163421
Access Level:acceso abierto
Palabra clave:Neotectònica
Falles (Geologia)
Neotectonics
Faults (Geology)
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spelling Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western PyreneesOrtuño Candela, MariaVilaplana, MiquelNeotectònicaFalles (Geologia)NeotectonicsFaults (Geology)The activity of normal faults in the Central-Western Pyrenees is mainly detected by the disruption of paleic landforms surviving to Plio-Quaternary incision: the remnants of a Low-Relief Topography (LRT) that probably originated asynchronically during the Oligocene and Miocene. We propose a new method for mapping the LRT remnants that combines automatic analysis of digital topography and cross-checking with regional databases of Quaternary landforms. We focus on an area where the location of the main-drainage divide seems to be influenced by the activity of the Bedous-Pic de Midi du Bigorre set of faults and by the North Maladeta Fault. Neotectonic markers defined by the remnants of LRT envelops are tectonically displaced up to ~700m by the previously identified faults, but also along new faults observed in between them. A western prolongation of the North Maladeta Fault has been identified for the first time, implying a 75km total trace length, almost twice the previously published value. A restoration of the fault block motion was performed assuming a regional uplift across the range, enhanced in the northern part of the Axial Zone. This uplift leads to an outer arch extension along the Maladeta-Bedous Fault System. The resulting paleo-topography shows a broad southern paleo-flank (up to ~120km long) with a gentle regional gradient (~1º) and a much shorter and steeper northern paleo-flank (~4º gradient, up to 30km-long). This configuration suggests that the LRT remnants now located North of the main divide were connected to the Ebro Basin. The results are supported by previous studies on age and source provenance of major alluvial systems mantling the northern and southern flanks of the chain.(UB). (ICTJA). (IDEA). (UAB). (CSIC)2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/163421Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1344/GeologicaActa2018.16.4.10Geologica Acta, 2018, vol. 16, num. 4, p. 499-518https://doi.org/10.1344/GeologicaActa2018.16.4.10cc-by-sa (c) Ortuño Candela, María et al., 2018http://creativecommons.org/licenses/by-sa/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1634212026-05-27T06:46:51Z
dc.title.none.fl_str_mv Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
title Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
spellingShingle Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
Ortuño Candela, Maria
Neotectònica
Falles (Geologia)
Neotectonics
Faults (Geology)
title_short Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
title_full Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
title_fullStr Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
title_full_unstemmed Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
title_sort Active fault control in the distribution of Elevated Low Relief Topography in the Central-Western Pyrenees
dc.creator.none.fl_str_mv Ortuño Candela, Maria
Vilaplana, Miquel
author Ortuño Candela, Maria
author_facet Ortuño Candela, Maria
Vilaplana, Miquel
author_role author
author2 Vilaplana, Miquel
author2_role author
dc.subject.none.fl_str_mv Neotectònica
Falles (Geologia)
Neotectonics
Faults (Geology)
topic Neotectònica
Falles (Geologia)
Neotectonics
Faults (Geology)
description The activity of normal faults in the Central-Western Pyrenees is mainly detected by the disruption of paleic landforms surviving to Plio-Quaternary incision: the remnants of a Low-Relief Topography (LRT) that probably originated asynchronically during the Oligocene and Miocene. We propose a new method for mapping the LRT remnants that combines automatic analysis of digital topography and cross-checking with regional databases of Quaternary landforms. We focus on an area where the location of the main-drainage divide seems to be influenced by the activity of the Bedous-Pic de Midi du Bigorre set of faults and by the North Maladeta Fault. Neotectonic markers defined by the remnants of LRT envelops are tectonically displaced up to ~700m by the previously identified faults, but also along new faults observed in between them. A western prolongation of the North Maladeta Fault has been identified for the first time, implying a 75km total trace length, almost twice the previously published value. A restoration of the fault block motion was performed assuming a regional uplift across the range, enhanced in the northern part of the Axial Zone. This uplift leads to an outer arch extension along the Maladeta-Bedous Fault System. The resulting paleo-topography shows a broad southern paleo-flank (up to ~120km long) with a gentle regional gradient (~1º) and a much shorter and steeper northern paleo-flank (~4º gradient, up to 30km-long). This configuration suggests that the LRT remnants now located North of the main divide were connected to the Ebro Basin. The results are supported by previous studies on age and source provenance of major alluvial systems mantling the northern and southern flanks of the chain.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/163421
url https://hdl.handle.net/2445/163421
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1344/GeologicaActa2018.16.4.10
Geologica Acta, 2018, vol. 16, num. 4, p. 499-518
https://doi.org/10.1344/GeologicaActa2018.16.4.10
dc.rights.none.fl_str_mv cc-by-sa (c) Ortuño Candela, María et al., 2018
http://creativecommons.org/licenses/by-sa/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-sa (c) Ortuño Candela, María et al., 2018
http://creativecommons.org/licenses/by-sa/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv (UB). (ICTJA). (IDEA). (UAB). (CSIC)
publisher.none.fl_str_mv (UB). (ICTJA). (IDEA). (UAB). (CSIC)
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300724

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