Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study

Lithospheric tearing at slab edges is common in scenarios where retreating slabs face continental margins. Such tearing is often accommodated via subvertical STEP (SubductionTransform Edge Propagator) faults that cut across the entire lithosphere and can result in sharp lateral thermal and rheologic...

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Autores: Negredo Moreno, Ana María, Mancilla, F. de L., Clemente, C., Morales, J., Fullea Urchulutegui, Javier
Formato: artículo
Fecha de publicación:2020
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/7593
Acesso em linha:https://hdl.handle.net/20.500.14352/7593
Access Level:acceso abierto
Palavra-chave:52
Alboran sea
Active tectonics
Gibraltar arc
Upper-mantle
Northern Morocco
Plate boundary
Sierra-Nevada
Step faults
Lithosphere
Beneath
Física atmosférica
2501 Ciencias de la Atmósfera
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oai_identifier_str oai:docta.ucm.es:20.500.14352/7593
network_acronym_str ES
network_name_str España
repository_id_str
spelling Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case StudyNegredo Moreno, Ana MaríaMancilla, F. de L.Clemente, C.Morales, J.Fullea Urchulutegui, Javier52Alboran seaActive tectonicsGibraltar arcUpper-mantleNorthern MoroccoPlate boundarySierra-NevadaStep faultsLithosphereBeneathFísica atmosférica2501 Ciencias de la AtmósferaLithospheric tearing at slab edges is common in scenarios where retreating slabs face continental margins. Such tearing is often accommodated via subvertical STEP (SubductionTransform Edge Propagator) faults that cut across the entire lithosphere and can result in sharp lateral thermal and rheological variations across the juxtaposed lithospheres. This setting favors the occurrence of continental delamination, i.e., the detachment between the crust and the lithospheric mantle. In order to evaluate this hypothesis, we have chosen a wellstudied natural example recently imaged with unprecedented seismic resolution: the STEP fault under the central Betic orogen, at the northern edge of the Gibraltar Arc subduction system (westernmost Mediterranean Sea). The Gibraltar Arc subduction is the result of the fast westward roll-back of the Alboran slab and it is in its last evolutionary stage, where the oceanic lithosphere has been fully consumed and the continental lithosphere attached to it collides with the overriding plate. In this study we investigate by means of thermo-mechanical modeling the conditions for, and consequences of, delamination post-dating slab tearing in the central Betics. We consider a setup based on a STEP fault separating the orogenic Betic lithosphere and the adjacent thinned lithosphere of the overriding Alboran domain. Our model analysis indicates that delamination is very sensitive to the initial thermal and rheological conditions, transitioning from a stable to a very unstable and rapidly evolving regime. We find two clearly differentiated regimes according to the time at which the process becomes unstable: fast and slow delamination. Although the final state reached in both the fast and slow regimes is similar, the dynamic surface topography evolution is dramatically different. We suggest that given a weak enough Iberian lower crust the delaminating lithospheric mantle peels off the crust and adopts a geometry consistent with the imaged southward dipping Iberian lithosphere in the central Betics. The lack of spatial correspondence between the highest topography and the thickest crust, as well as the observed pattern of uplift/ subsidence are properly reproduced by a model where relatively fast delamination (Reference Model) develops after slab tearing.Frontiers MediaUniversidad Complutense de Madrid20202020-10-0620202020-10-06journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/7593reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/75932026-06-02T12:44:21Z
dc.title.none.fl_str_mv Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
title Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
spellingShingle Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
Negredo Moreno, Ana María
52
Alboran sea
Active tectonics
Gibraltar arc
Upper-mantle
Northern Morocco
Plate boundary
Sierra-Nevada
Step faults
Lithosphere
Beneath
Física atmosférica
2501 Ciencias de la Atmósfera
title_short Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
title_full Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
title_fullStr Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
title_full_unstemmed Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
title_sort Geodynamic modeling of edge-delamination driven by subduction-transform edge propagator faults: the Westernmost Mediterranean Margin (Central Betic Orogen) Case Study
dc.creator.none.fl_str_mv Negredo Moreno, Ana María
Mancilla, F. de L.
Clemente, C.
Morales, J.
Fullea Urchulutegui, Javier
author Negredo Moreno, Ana María
author_facet Negredo Moreno, Ana María
Mancilla, F. de L.
Clemente, C.
Morales, J.
Fullea Urchulutegui, Javier
author_role author
author2 Mancilla, F. de L.
Clemente, C.
Morales, J.
Fullea Urchulutegui, Javier
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Alboran sea
Active tectonics
Gibraltar arc
Upper-mantle
Northern Morocco
Plate boundary
Sierra-Nevada
Step faults
Lithosphere
Beneath
Física atmosférica
2501 Ciencias de la Atmósfera
topic 52
Alboran sea
Active tectonics
Gibraltar arc
Upper-mantle
Northern Morocco
Plate boundary
Sierra-Nevada
Step faults
Lithosphere
Beneath
Física atmosférica
2501 Ciencias de la Atmósfera
description Lithospheric tearing at slab edges is common in scenarios where retreating slabs face continental margins. Such tearing is often accommodated via subvertical STEP (SubductionTransform Edge Propagator) faults that cut across the entire lithosphere and can result in sharp lateral thermal and rheological variations across the juxtaposed lithospheres. This setting favors the occurrence of continental delamination, i.e., the detachment between the crust and the lithospheric mantle. In order to evaluate this hypothesis, we have chosen a wellstudied natural example recently imaged with unprecedented seismic resolution: the STEP fault under the central Betic orogen, at the northern edge of the Gibraltar Arc subduction system (westernmost Mediterranean Sea). The Gibraltar Arc subduction is the result of the fast westward roll-back of the Alboran slab and it is in its last evolutionary stage, where the oceanic lithosphere has been fully consumed and the continental lithosphere attached to it collides with the overriding plate. In this study we investigate by means of thermo-mechanical modeling the conditions for, and consequences of, delamination post-dating slab tearing in the central Betics. We consider a setup based on a STEP fault separating the orogenic Betic lithosphere and the adjacent thinned lithosphere of the overriding Alboran domain. Our model analysis indicates that delamination is very sensitive to the initial thermal and rheological conditions, transitioning from a stable to a very unstable and rapidly evolving regime. We find two clearly differentiated regimes according to the time at which the process becomes unstable: fast and slow delamination. Although the final state reached in both the fast and slow regimes is similar, the dynamic surface topography evolution is dramatically different. We suggest that given a weak enough Iberian lower crust the delaminating lithospheric mantle peels off the crust and adopts a geometry consistent with the imaged southward dipping Iberian lithosphere in the central Betics. The lack of spatial correspondence between the highest topography and the thickest crust, as well as the observed pattern of uplift/ subsidence are properly reproduced by a model where relatively fast delamination (Reference Model) develops after slab tearing.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-10-06
2020
2020-10-06
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/7593
url https://hdl.handle.net/20.500.14352/7593
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
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
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
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Frontiers Media
publisher.none.fl_str_mv Frontiers Media
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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