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A tectonic carpet of Variscan flysch at the base of a rootless accretionary prism in northwestern Iberia: U–Pb zircon age constrains from sediments and volcanic olistoliths

2021-04-15Artigo científico Acesso aberto
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dc.contributor.authorClavijo, Emilio
dc.contributor.authorSilva, Ícaro
dc.contributor.authorMartínez Catalán, José R.
dc.contributor.authorGómez Barreiro, Juan
dc.contributor.authorGutiérrez-Alonso, Gabriel
dc.contributor.authorDíez Montes, Alejandro
dc.contributor.authorHofmann, Mandy
dc.contributor.authorGärtner, Andreas
dc.contributor.authorLinnemann, Ulf
dc.date.accessioned2022-02-23T15:03:31Z
dc.date.available2022-02-23T15:03:31Z
dc.date.issued2021-04-15
dc.description.abstractThe allochthonous complexes of Galicia–Trás-os-Montes Zone (NW Iberia) are part of a rootless tectonic stack which preserves part of a Variscan accretionary prism. They are formed by individual tectonic slices marked by specific tectonometamorphic evolutions, which were piled up in a piggy-back mode onto its relative autochthon, the Central Iberian Zone (CIZ). Allochthony decreases from the structurally upper thrust sheets towards the lower ones. The lowermost unit of the stack is known as the Parautochthon or Schistose Domain. It is characterized by a low metamorphic grade in contrast with higher temperatures and/or pressures estimated for the overlying allochthonous units and shares the stratigraphic sequence with the underlying autochthon. The Parautochthon is divided in two structural and stratigraphic sub-units: (i) the Lower Parautochthon (LPa) is made of synorogenic flysch-type sediments with varied turbiditic units and olistostrome bodies, showing Upper Devonian–lower Carboniferous age according to the youngest zircon populations and fossiliferous content; (ii) the Upper Parautochthon (UPa) is composed of highly deformed preorogenic upper Cambrian–Silurian volcano-sedimentary sequence comparable with the nearby autochthon and to some extent, also with the high-P and low-T Lower Allochthon laying structurally above. The UPa was emplaced onto the LPa along the Main-Trás-os-Montes Thrust, and the LPa became detached from the CIZ relative autochthon by a regional-scale structure, the Basal Lower Parautochthon Detachment, which follows a weak horizon of Silurian carbonaceous slates. A review on the detrital zircon studies on the synorogenic LPa complemented by zircon dating of 17 new samples is presented here. The results support the extension of the LPa underneath the NW Iberian allochthonous complexes, from Cabo Ortegal, to Bragança and Morais massifs. Its current exposure follows the lowermost tectonic boundary between the Galicia–Trás-os-Montes (allochthon) and Central Iberian (autochthon) zones. The youngest zircon age populations point to a maximum sedimentation age for the LPa formations ranging from Famennian to Serpukhovian and supports the piggy-back mode of emplacement of the Galicia–Trás-os-Montes Zone, of which it represents the latest imbricate. The zircon age populations in the LPa allow the sedimentary provenance areas to be constrained, showing the intervention of nearby sources (mostly the UPa) and/or multiply recycled and long-transport sediments with a typically north-central Gondwana age fingerprint, also found in the Lower Allochthon, UPa and Autochthon. Complementary geochronology of volcanic olistoliths trapped in the LPa sediments and of late Cambrian to Upper Ordovician rhyolites from the UPa is also presented. It shows a direct relationship between the major blocks source area (UPa) and the setting place (LPa). Old zircon age patterns show that the LPa sedimentary rocks were recycled from detrital rocks of the allochthon (advancing wedge) and the nearby autochthon (peripheral bulge).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGonzález Clavijo E, Dias da Silva Í, Martínez Catalán JR, Gómez Barreiro J, Gutiérrez-Alonso G, Díez Montes A, Hofmann M, Gärtner A, Linnemann U (2021) A tectonic carpet of Variscan flysch at the base of a rootless accretionary prism in northwestern Iberia: U–Pb zircon age constrains from sediments and volcanic olistoliths, Solid Earth, 12 (4), 835-867. doi:10.5194/se-12-835-2021pt_PT
dc.identifier.doi10.5194/se-12-835-2021pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/51471
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherEGUpt_PT
dc.relationFCT/UIDB/50019/2020-IDLpt_PT
dc.relationZonas de cisalhamento: sua importância para a arquitetura da litosfera Paleozoica e papel no estabelecimento de jazidas auríferas nas Zonas Galiza-Trás-os-Montes, Centro Ibérica e Ossa Morena.
dc.relationMinisterio de Ciencia, Innovación y Universidades (grant no. CGL2016-78560-P)pt_PT
dc.relationEuropean Commission Horizon 2020 Framework Programme SYNTHESYS3 (grant no. DE-TAF-5798)pt_PT
dc.relationProgram XII grant of the University of Salamanca; the Spanish Ministry of Science, Innovation and Universities: project IBERCRUST (grant no. PGC2018–096534-B-100)pt_PT
dc.relationResolution of the Russian Federation Government (agreement no. 14.Y26.31.0012)pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectResearch Subject Categories::NATURAL SCIENCES::Earth sciencespt_PT
dc.titleA tectonic carpet of Variscan flysch at the base of a rootless accretionary prism in northwestern Iberia: U–Pb zircon age constrains from sediments and volcanic olistolithspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberSFRH/BPD/99550/2014
oaire.awardTitleZonas de cisalhamento: sua importância para a arquitetura da litosfera Paleozoica e papel no estabelecimento de jazidas auríferas nas Zonas Galiza-Trás-os-Montes, Centro Ibérica e Ossa Morena.
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F99550%2F2014/PT
oaire.citation.endPage867pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage835pt_PT
oaire.citation.titleSolid Earthpt_PT
oaire.citation.volume12pt_PT
oaire.fundingStreamOE
person.familyNameGonzález Clavijo
person.familyNameFróis Dias da Silva
person.familyNameMartínez Catalán
person.givenNameEmilio José
person.givenNameÍcaro
person.givenNameJosé R.
person.identifierA-2643-2012
person.identifier.ciencia-id7B16-2D09-6910
person.identifier.ciencia-id411B-CB2C-FAC4
person.identifier.orcid0000-0002-8876-2987
person.identifier.orcid0000-0002-0185-9410
person.identifier.orcid0000-0002-2422-2244
person.identifier.scopus-author-id55508256500
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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