Publication:
Variscan inheritance induces Alpine upper crustal delamination in East Spanish–Portuguese Central System

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dc.contributor.authorDe Vicente Muñoz, Gerardo
dc.contributor.authorDíez Fernández, Rubén
dc.contributor.authorOlaiz Campos, Antonio José
dc.contributor.authorMuñoz Martín, Alfonso
dc.date.accessioned2023-06-22T10:54:46Z
dc.date.available2023-06-22T10:54:46Z
dc.date.issued2022-07-20
dc.description.abstractThe Spanish–Portuguese Central System (SPCS) is an Alpine Mountain range with crystalline basement characterised by a two-layer rheological structure. This structure formed after primary (protolith) and secondary (tectonometamorphic) processes during the extensional collapse of the Variscan Orogen. The SPCS structure is usually controlled by foreland-directed thrusts and strike-slip faults. However, the eastern SPCS is dominated by NW-directed, imbricate backthrusts and lacks the main thrust directed to the foreland basin located southeast of the mountain range (Madrid Cenozoic Basin). The SPCS exhibits a crustal root (> 40 km depth) supporting SE-directed crustal-scale thrusting. Alpine backthrusts sole into an SE-dipping décollement within the Variscan basement. Variscan extension-related structures parallel the SE-dipping geometry of Alpine backthrusts, so they provided favourably oriented rheological weaknesses to accommodate Alpine shortening. Backthrusts geometry, their hanging wall position within the fault that raised the SPCS and gravity modelling support an Alpine crustal delamination process. Tectonic wedging and delamination of the more competent basement occurred in the footwall of Variscan extensional faults (Daurius domain), which enforced the shearing off of a rheologically weaker upper layer of the crust, located in the hanging wall of the Variscan extensional faults (Arriaca domain) by inverting Variscan extensional faults. This led to NW-directed incipient continental subduction of the weaker crust. Intraplate subduction and crustal delamination can be independent from lithosphere-scale inheritance and be conditioned by structural inheritance in the overlying crust. Alpine shortening for the Cretaceous cover is around 17.7 km (10.5% shortening), and 11 km (7%) for the upper-lower crust limit.
dc.description.departmentDepto. de Geodinámica, Estratigrafía y Paleontología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/74099
dc.identifier.doi10.1029/2022TC007315
dc.identifier.issn1944-9194
dc.identifier.officialurlhttps://doi.org/10.1029/2022TC007315
dc.identifier.urihttps://hdl.handle.net/20.500.14352/71877
dc.issue.numbere2022T
dc.journal.titleTectonics
dc.language.isospa
dc.page.final31
dc.page.initial1
dc.publisherAGU
dc.relation.projectIDMARIBNO (PGC2018-095999-B-I00)
dc.rightsAtribución 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/es/
dc.subject.ucmGeofísica
dc.subject.ucmGeología
dc.subject.ucmGeodinámica
dc.subject.unesco2507 Geofísica
dc.subject.unesco2506 Geología
dc.subject.unesco2507 Geofísica
dc.titleVariscan inheritance induces Alpine upper crustal delamination in East Spanish–Portuguese Central System
dc.typejournal article
dc.volume.number41
dspace.entity.typePublication
relation.isAuthorOfPublication5a03ae3f-5399-488e-b3ba-546c9011caa8
relation.isAuthorOfPublication70f369a3-b3cd-43cb-874e-a7888da25de1
relation.isAuthorOfPublication.latestForDiscovery5a03ae3f-5399-488e-b3ba-546c9011caa8
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