Unraveling the origins and P-T-t evolution of the allochthonous Sobrado unit (Órdenes Complex, NW Spain) using combined U–Pb titanite, monazite and zircon geochronology and rare-earth element (REE) geochemistry

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dc.contributor.authorBenítez Pérez, José Manuel
dc.contributor.authorCastiñeiras García, Pedro
dc.contributor.authorGómez Barreiro, Juan
dc.contributor.authorMartínez Catalán, José Ramón
dc.contributor.authorKylander-Clark, Andrew
dc.contributor.authorHoldsworth, Robert
dc.date.accessioned2023-06-17T08:56:32Z
dc.date.available2023-06-17T08:56:32Z
dc.date.issued2020
dc.description.abstractThe Sobrado unit, within the upper part of the Órdenes Complex (NW Spain) represents an allochthonous tectonic slice of exhumed high-grade metamorphic rocks formed during a complex sequence of orogenic processes in the middle to lower crust. In order to constrain those processes, U–Pb geochronology and rare-earth element (REE) analyses of accessory minerals in migmatitic paragneiss (monazite, zircon) and mylonitic amphibolites (titanite) were conducted using laser ablation split stream inductively coupled plasma mass spectrometry (LASS-ICP-MS). The youngest metamorphic zircon age obtained coincides with a Middle Devonian concordia monazite age (∼380 Ma) and is interpreted to represent the minimum age of the Sobrado high-P granulite facies metamorphism that occurred during the early stages of the Variscan orogeny. Metamorphic titanite from the mylonitic amphibolites yield a Late Devonian age (∼365 Ma) and track the progressive exhumation of the Sobrado unit. In zircon, cathodoluminescence images and REE analyses allow two aliquots with different origins in the paragneiss to be distinguished. An Early Ordovician age (∼490 Ma) was obtained for metamorphic zircons, although with a large dispersion, related to the evolution of the rock. This age is considered to mark the onset of granulite facies metamorphism in the Sobrado unit under intermediate-P conditions, and related to intrusive magmatism and coeval burial in a magmatic arc setting. A maximum depositional age for the Sobrado unit is established in the late Cambrian (∼511 Ma). The zircon dataset also record several inherited populations. The youngest cogenetic set of zircons yields crystallization ages of 546 and 526 Ma which are thought to be related to the peri-Gondwanan magmatic arc. The additional presence of inherited zircons older than 1000 Ma is interpreted as suggesting a West African Craton provenance.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/63394
dc.identifier.doi10.5194/se-11-2303-2020
dc.identifier.issn1869-9510
dc.identifier.officialurlhttps://se.copernicus.org/articles/11/2303/2020/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/7616
dc.journal.titleSolid Earth and Discussions
dc.language.isoeng
dc.page.final2325
dc.page.initial2303
dc.publisherEuropean Geosciences Union
dc.relation.projectIDCGL2016-78560-P; CGL2011-22728; FPI 2013-2016 (BES-2012-059893)
dc.relation.projectIDIEDI-2016-00691
dc.rightsAtribución 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/es/
dc.subject.cdu551.24:550.4(460)
dc.subject.ucmGeodinámica
dc.subject.ucmGeoquímica
dc.subject.ucmPetrología
dc.subject.unesco2507 Geofísica
dc.subject.unesco2503 Geoquímica
dc.titleUnraveling the origins and P-T-t evolution of the allochthonous Sobrado unit (Órdenes Complex, NW Spain) using combined U–Pb titanite, monazite and zircon geochronology and rare-earth element (REE) geochemistry
dc.typejournal article
dc.volume.number11
dspace.entity.typePublication
relation.isAuthorOfPublicationb2d76e4a-9656-45d4-883f-6027fdd52d29
relation.isAuthorOfPublicationa1923245-aea2-4606-b726-d329291980fc
relation.isAuthorOfPublication.latestForDiscoveryb2d76e4a-9656-45d4-883f-6027fdd52d29
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