Reconstruction of the prograde PT history of high‐P migmatitic paragneisses via melt‐reintegration approach and thermodynamic modelling (Allochthonous Complexes, NW Iberian Massif)

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dc.contributor.authorNovo Fernández, Irene
dc.contributor.authorAlbert Roper, Richard
dc.contributor.authorArenas Martín, Ricardo
dc.contributor.authorGarcia Casco, Antonio
dc.contributor.authorDíez Fernández, Rubén
dc.contributor.authorSánchez Martínez, Sonia
dc.date.accessioned2023-06-17T08:56:09Z
dc.date.available2023-06-17T08:56:09Z
dc.date.issued2020
dc.description.abstractThe Upper Units of the allochthonous complexes of the NW Iberian Massif constitute a terrane with continental affinity. They represent the vestiges of a Cambrian magmatic arc developed in the periphery of Gondwana (West African Craton) which was involved in the Devonian Variscan collision, undergoing high‐P, high‐T metamorphism. This includes ultramafic rocks, high‐P mafic rocks (eclogites and granulites) and high‐P migmatitic paragneisses. The latter rocks show an extensive migmatization with the leucosomes oriented parallel to the regional foliation. The migmatitic paragneisses are composed of garnet, kyanite, biotite, quartz, plagioclase, K‐feldspar, rutile and Ti‐hematite. Thermodynamic modelling using the measured bulk composition in the NCKFMASTHO system indicates metamorphic peak conditions of ~15 kbar and ~800 to 835°C, followed by a significant cooling. The prograde evolution is assessed by means of a melt‐reintegration approach, using the composition of the garnet and its inclusions. An appropriate composition of liquid is added to the measured bulk composition to emulate the pre‐melting bulk composition. Modelling of this melt‐reintegrated composition allows to identify a colder high‐P episode below ~500°C. Zircon crystals extracted from the leucosomes show overgrowths crystallized from the partial melt at c. 389 Ma (U–Pb system). The P–T–t path proposed reveals a subduction of the peri‐Gondwanan arc‐derived section down to mantle depths. An isobaric heating stage occurred as a result of residence at great depths and/or inception of a transient oceanic basin at c. 395 Ma. The ensuing near‐isothermal exhumation occurred due to the extension related to the inception of the basin, reaching the thermal peak shortly before c. 389 Ma. Subsequent cooling is related to the underthrusting of colder oceanic and transitional crust below the HP‐HT Upper Units.
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 Educación y Formación Profesional
dc.description.sponsorshipWilhelm and Else Heraeus Foundation
dc.description.sponsorshipDeutsche Forschungsgemeinschaft
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/63280
dc.identifier.doi10.1111/jmg.12533
dc.identifier.issn0263-4929
dc.identifier.officialurlhttps://onlinelibrary.wiley.com/doi/full/10.1111/jmg.12533
dc.identifier.urihttps://hdl.handle.net/20.500.14352/7576
dc.issue.number6
dc.journal.titleJournal of Metamorphic Geology
dc.language.isoeng
dc.page.final653
dc.page.initial629
dc.publisherWiley
dc.relation.projectIDCGL2016-76438-P
dc.relation.projectIDFPU16/05281
dc.relation.projectIDINST 161/921-1 FUGG
dc.relation.projectIDINST 161/923-1 FUGG
dc.rights.accessRightsrestricted access
dc.subject.cdu551.25(460)
dc.subject.cdu552.16(460)
dc.subject.keywordhigh-P migmatitic paragneisses
dc.subject.keywordICP-MS
dc.subject.keywordthermodynamic modelling
dc.subject.keywordU–Pb
dc.subject.keywordVariscan Orogen
dc.subject.ucmPetrología
dc.titleReconstruction of the prograde PT history of high‐P migmatitic paragneisses via melt‐reintegration approach and thermodynamic modelling (Allochthonous Complexes, NW Iberian Massif)
dc.typejournal article
dc.volume.number38
dspace.entity.typePublication
relation.isAuthorOfPublication79797d12-67a8-43ca-9e04-618eb776999b
relation.isAuthorOfPublication590ee677-786b-4d34-b10b-30b65d1a8d35
relation.isAuthorOfPublication5a03ae3f-5399-488e-b3ba-546c9011caa8
relation.isAuthorOfPublication23c93f55-b253-4f57-9df0-b6f3c6bc61c3
relation.isAuthorOfPublication.latestForDiscovery79797d12-67a8-43ca-9e04-618eb776999b
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