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Tales from xenoliths: the link between the Papôa Volcanic Breccia and the Berlengas Archipelago (West Portugal): geodynamic implications

2023-12Journal article Open access
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dc.contributor.authorRosa, Ana Rita
dc.contributor.authorCachapuz, P.
dc.contributor.authorSantos, Telmo M. Bento Dos
dc.contributor.authorPereira, Inês
dc.contributor.authorSolá, A. Rita
dc.contributor.authorCarvalho, D.
dc.contributor.authorRomão, José
dc.contributor.authorValverde-Vaquero, Pablo
dc.date.accessioned2024-03-20T16:20:52Z
dc.date.available2024-03-20T16:20:52Z
dc.date.issued2023-12
dc.description.abstractABSTRACT: The Papoa Volcanic Breccia (Peniche, West Portugal) is a Mesozoic pyroclastic deposit that includes numerous igneous and metamorphic xenoliths belonging to the Variscan basement of the Lusitanian Basin, in which this unit outcrops. These rocks correspond mostly to syenogranites and diatexites affected by intense pyrometamorphism and, despite their strong secondary alteration by weathering, they still preserve several original petrographic features that are traceable to the lithologies that comprise the Berlengas Archipelago, located 15 km offshore the Peniche coast. New geochemical and mineral chemistry data now indicate a genetic relationship between these basement xenoliths and the Late Devonian migmatites outcropping in the Farilhoes Anatectic Complex. Such evidence strongly suggests the physical continuity of these high-grade metamorphic terrains at least to the Peniche region, thus constraining the nature and composition of the crustal block beneath the sedimentary sequences of the Lusitanian Basin in the studied location. In addition, in situ LA-ICP-MS U-Pb dating of rutile formed during the pyrometamorphic event endured by the xenoliths provided an age of 92.3 +/- 1.4 Ma for the Papoa volcanic eruption, placing this occurrence within the third magmatic cycle related to the opening and spreading of the North Atlantic Ocean in the West Iberian Margin.pt_PT
dc.description.abstractRESUMEN: La Brecha Volcanica de Papoa (Peniche, Oeste de Portugal) es un deposito piroclastico de edad mesozoica que se encuentra en la Cuenca Lusitanica y que presenta numerosos xenolitos igneos y metamorficos procedentes del basamento Varisco de esa cuenca. Estas rocas corresponden en su mayoria a sienogranitos y diatexitas que estan afectadas por un intenso pirometamorfismo y que, a pesar de su fuerte alteracion secundaria debida a meteorizacion, conservan caracteristicas petrograficas originales que permiten asimilarlas a las litologias que componen el Archipielago de Berlengas, ubicado a 15 km de la costa de Peniche. Nuevos datos geoquimicos y de quimica mineral indican una relacion genetica entre estos xenolitos del basamento y las migmatitas del Devonico Superior que afloran en el Complejo Anatectico de Farilhoes. Estas evidencias sugieren la existencia de continuidad fisica de estos terrenos metamorficos de alto grado por lo menos hasta la region de Peniche, y definen la naturaleza y composicion de la unidad cortical bajo las sucesiones sedimentarias de la Cuenca Lusitanica en el area estudiada. Ademas, las dataciones U-Pb mediante LA-ICP-MS in situ sobre rutilos formados en el evento pirometamorfico sufrido por los xenolitos, proporcionan una edad de 92,3 +/- 1,4 Ma para la erupcion volcanica de Papoa, ubicando este evento en el marco de tercer ciclo magmatico relacionado con la apertura y expansion del Atlantico Norte en el Margen Occidental de Iberia.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRosa, A. R. , Cachapuz, P., dos Santos, T.B. , Pereira, I., Solá, A.R., Carvalho, D.R., Romão, J.M. & Vaquero, P.V. (2023) Tales from xenoliths: the link between the Papôa Volcanic Breccia and the Berlengas Archipelago (West Portugal): geodynamic implications. In: Journal of Iberian Geology, vol. 49 (3-4), p. 275–364. https://doi.org/10.1007/s41513-023-00218-6pt_PT
dc.identifier.doi10.1007/s41513-023-00218-6pt_PT
dc.identifier.issn1698-6180
dc.identifier.urihttp://hdl.handle.net/10400.9/4270
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationPTDC/CT PTDC/CTAA-GEF/30264/2017pt_PT
dc.relationInstituto Dom Luiz
dc.relation.publisherversionhttps://doi.org/10.1007/s41513-023-00218-6pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectCrustal xenolithspt_PT
dc.subjectMagmatismpt_PT
dc.subjectMesozoicpt_PT
dc.subjectLusitanian Basinpt_PT
dc.subjectVariscan orogenypt_PT
dc.subjectPeniche, Portugalpt_PT
dc.titleTales from xenoliths: the link between the Papôa Volcanic Breccia and the Berlengas Archipelago (West Portugal): geodynamic implicationspt_PT
dc.title.alternativeCuentos de xenolitos - El vínculo entre la Brecha Volcánica de Papôa y el Archipiélago de las Berlengas (Oeste de Portugal): implicaciones geodinámicaspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.endPage364pt_PT
oaire.citation.startPage275pt_PT
oaire.citation.titleJournal of Iberian Geologypt_PT
oaire.citation.volume49pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameBento dos Santos
person.familyNamePereira
person.familyNameSolá
person.familyNameRomão
person.familyNameValverde-Vaquero
person.givenNameTelmo
person.givenNameInês
person.givenNameA. Rita
person.givenNameJosé
person.givenNamePablo
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person.identifier.ciencia-idC113-4776-D146
person.identifier.ciencia-id4713-7D9F-6567
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person.identifier.orcid0000-0001-9567-5470
person.identifier.orcid0000-0001-8003-1285
person.identifier.orcid0000-0002-2184-0848
person.identifier.ridF-8075-2012
person.identifier.ridG-6378-2015
person.identifier.ridM-3394-2014
person.identifier.scopus-author-id36093841900
person.identifier.scopus-author-id56262014300
person.identifier.scopus-author-id55911124900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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