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Ordovician–Silurian transition in the Central-Iberian Zone: Just a stratigraphic boundary or a major element in the evolution of the Iberian Variscides?

2025-04Journal article Open access
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
dc.contributor.authorTereso, Vitor
dc.contributor.authorDias, Rui
dc.contributor.authorRoseiro, José
dc.contributor.authorRomão, José
dc.contributor.authorCoke, Carlos
dc.contributor.authorFonseca, Rita
dc.contributor.authorRibeiro, António
dc.date.accessioned2025-06-30T16:19:28Z
dc.date.available2025-06-30T16:19:28Z
dc.date.issued2025-04
dc.description.abstractABSTRACT: The Ordovician-Silurian boundary in the Central-Iberian Zone is often considered a normal stratigraphic transition. Nevertheless, in studies carried out in Portugal (e.g. Espinhosela, São Mamede and Buçaco areas) and Spain (e.g. Alcañices Synform) this contact is marked by the development of shear zones subparallel to the lithostratigraphic units. Ongoing structural mapping in Celorico de Basto (Marão region) shows that near Campanhó, the Ordovician (Pardelhas Formation) and the Silurian (Campanhó Formation) units are bounded by a regional shear zone with a normal kinematics (the Covelo do Monte Fault, here presented). Although their origin is debatable, the intraorogenic normal faults are common mechanisms active during Variscan times in the Central-Iberian Zone. In the case of the Ordovician-Silurian boundary, these detachments could be facilitated by shale and organic materials prone to control the development of shear zones.eng
dc.description.abstractRESUMO: O limite Ordovícico-Silúrico na Zona Centro-Ibérica é frequentemente considerado uma transição estratigráfica normal. No entanto, estudos realizados em Portugal (e.g. áreas de Espinhosela, São Mamede e Buçaco) e Espanha (e.g. Sinforma de Alcañices), mostram que este contato é frequentemente marcado pelo desenvolvimento de zonas de cisalhamento subparalelas às unidades litostratigráficas. Cartografia estrutural de pormenor em curso em Celorico de Basto (região do Marão) mostram que, próximo a Campanhó, as unidades do Ordovícico (Formação de Pardelhas) e do Silúrico (Formação de Campanhó) são limitadas por uma falha normal (a Falha de Covelo do Monte, aqui apresentada). Embora a sua génese seja controversa, a instalação de falhas normais intra-orogénicas é um mecanismo comum ativo durante o orógeno Varisco na Zona Centro-Ibérica. No caso do contacto Ordovícico-Silúrico, estas falhas parecem ter sido controladas por material orgânico e argiloso suscetível de desenvolver superfícies de descolamento.por
dc.identifier.citationTereso, V., Dias, R., Romão, J., Roseiro, J., Coke, C., Fonseca, R. & Ribeiro, A. (2025). Ordovician-Silurian transition in the Central-Iberian Zone: Just a stratigraphic boundary or a major element in the evolution of the Iberian Variscides?. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 391-394. https://doi.org/10.34637/wazf-vm73
dc.identifier.doi10.34637/wazf-vm73
dc.identifier.eissn1647-581X
dc.identifier.issn0873-948X
dc.identifier.urihttp://hdl.handle.net/10400.9/5904
dc.language.isoeng
dc.peerreviewedyes
dc.publisherLNEG - Laboratório Nacional de Energia e Geologia
dc.relationINSTITUTE OF EARTH SCIENCES
dc.relationFrom mantle to Iberia: crust-mantle interaction, geodynamic evolution and ore forming systems of alkaline melts in the northernmost Ossa-Morena Zone domains
dc.relation.hasversionhttps://www.lneg.pt/wp-content/uploads/2025/04/78_Tereso-et-al.pdf
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectCentral-Iberian Zone
dc.subjectOrdovician-Silurian boundary
dc.subjectMarão region
dc.subjectIberian Variscides
dc.subjectZona Centro-Ibérica
dc.subjectTransição Ordovícico-Silúrico
dc.subjectRegião do Marão
dc.subjectVarisco Ibérico
dc.titleOrdovician–Silurian transition in the Central-Iberian Zone: Just a stratigraphic boundary or a major element in the evolution of the Iberian Variscides?eng
dc.title.alternativeTransição Ordovícico-Silúrico na Zona Centro-Ibérica: Apenas um contacto estratigráfico ou um elemento estruturante do Varisco Ibérico?por
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleINSTITUTE OF EARTH SCIENCES
oaire.awardTitleFrom mantle to Iberia: crust-mantle interaction, geodynamic evolution and ore forming systems of alkaline melts in the northernmost Ossa-Morena Zone domains
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04683%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POR_ALENT/UI%2FBD%2F150937%2F2021/PT
oaire.citation.endPage394
oaire.citation.issueEspecial I
oaire.citation.startPage391
oaire.citation.titleComunicações Geológicas
oaire.citation.volume112
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamPOR_ALENT
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
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project.funder.identifierhttp://doi.org/10.13039/501100001871
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project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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Volume 112 (2025) Fascículo Especial I - XI Congresso Nacional de Geologia