Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain

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dc.contributor.authorMartínez Catalán, José Ramón
dc.contributor.authorArenas Martín, Ricardo
dc.contributor.authorDíaz García, Florentino
dc.contributor.authorRubio Pascual, Francisco J.
dc.contributor.authorAbati Gómez, Jacobo
dc.contributor.authorMarquínez, Jorge
dc.date.accessioned2023-06-20T17:20:09Z
dc.date.available2023-06-20T17:20:09Z
dc.date.issued1996
dc.description.abstractA structural and metamorphic study was carried out in the basal units of the Ordenes Complex in Spain, thought to represent a subducted part of the Paleozoic margin of Gondwana. According to their metamorphic evolution, this part of the margin was subducted at the onset of the Variscan Orogeny, becoming part of an accretionary complex developed below a colliding element built previously. Variations in the PT conditions of the first high-pressure metamorphic event along the units indicate a polarity of the subduction to the west. Subsequent underthrusting of more continental material blocked the subduction and triggered the ascent and exhumation of the basal units, whereas the convergence continued. Recumbent folds and thrusts de ve loped along with successive normal detachments. Compressional and extensional structures were synchronous or alternated in time and together induced the thinning and tapering of the orogenic wedge and its lateral spreading. The unroofing took place locally under an inverted temperature gradient caused by a detachment which carried a part of the hot mantle wedge above the subduction zone over the subducted units.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipDGICYT (Spain).
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/69836
dc.identifier.issnISSN: 0278-7407 ; ESSN: 1944-9194
dc.identifier.officialurlhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/95TC02617
dc.identifier.urihttps://hdl.handle.net/20.500.14352/58114
dc.issue.number1
dc.journal.titleTectonics
dc.language.isoeng
dc.page.final121
dc.page.initial106
dc.publisherAmerican Geophysical Union
dc.relation.projectIDPB91-0192-C02
dc.rights.accessRightsopen access
dc.subject.cdu551.25
dc.subject.keywordVarisman
dc.subject.keywordPaleozoic
dc.subject.keywordContinental margin
dc.subject.keywordGalicia
dc.subject.ucmGeodinámica
dc.subject.unesco2507 Geofísica
dc.titleVariscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
dc.typejournal article
dc.volume.number15
dspace.entity.typePublication
relation.isAuthorOfPublication590ee677-786b-4d34-b10b-30b65d1a8d35
relation.isAuthorOfPublication6cb07e41-d685-424f-9bd7-48e62c3dc87f
relation.isAuthorOfPublication.latestForDiscovery590ee677-786b-4d34-b10b-30b65d1a8d35
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