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Exhumation of an anatectic complex by channel flow and extrusion tectonics: structural and metamorphic evidence from the Porto–Viseu Metamorphic Belt, Central-Iberian Zone

dc.contributor.authorM. Bento dos Santos, Telmo
dc.contributor.authorRodrigues, José Feliciano
dc.contributor.authorCastro, Paulo
dc.contributor.authorCotrim, Beatriz
dc.contributor.authorPereira, Inês
dc.contributor.authorFerreira, Joana
dc.contributor.authorPinto De Meireles, Carlos Augusto
dc.contributor.authorFerreira, Narciso
dc.contributor.authorFerreira, Priscila
dc.contributor.authorRibeiro, António
dc.contributor.authorGuimarães, Fernanda
dc.date.accessioned2021-12-29T13:27:45Z
dc.date.available2023-06-01T00:30:17Z
dc.date.issued2021-06
dc.description.abstractAbstract: Structural and metamorphic analyses of the Porto–Viseu Metamorphic Belt (PVMB), an anatectic complex located in the Central-Iberian Zone (CIZ), Iberian Variscan Massif, constrain the kinematic features of the polyphase Variscan deformation, as well as the boundary conditions associated with the exhumation and emplacement of the belt onto the CIZ’s lower-grade metasediments. A sharp metamorphic contrast is evident between the lowest grade rocks of the anatectic complex—garnet-staurolite mylonitic schists with a minimum metamorphic peak at P = 5.7 kbar and T = 635 °C—and the host chlorite-biotite metasediments of the CIZ. Additional P–T estimates for metatexites in the PVMB provided P = 7.6–7.9 kbar and T = 770–810 °C, confirming high-grade metamorphic peak conditions. The temperature jump between the anatectic complex and the low-grade host rocks exceeds 400 °C if the anatectic core of the belt (metatexites, diatexites, and S-type granites) is considered, implying a vertical difference of 10–17 km. The PVMB is limited in the NE by a D2 shear zone displaying normal kinematics, which has been explained so far by extensional tectonics. However, the SW boundary is limited by a D2 shear zone showing reverse kinematics. This pair of coeval and antithetical ductile shear zones bordering the PVMB, associated with the increase of the metamorphic grade towards the axial domain of the belt, is consistent with anatectic channel flow, followed by extrusion tectonics of the PVMB within an overall D2 compressive setting.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBento dos Santos et al. 2021, ‘Exhumation of an anatectic complex by channel flow and extrusion tectonics: structural and metamorphic evidence from the Porto–Viseu Metamorphic Belt, Central-Iberian Zone’, International Journal of Earth Sciences, vol. 110, nº 6, pp. 2179-2201. doi:10.1007/s00531-021-02067-zpt_PT
dc.identifier.doihttps://doi.org/10.1007/s00531-021-02067-zpt_PT
dc.identifier.eissn1437-3262
dc.identifier.issn1437-3254
dc.identifier.urihttp://hdl.handle.net/10400.9/3645
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationFCT Pest programme (Pest-OE/CTE/UI0263/2011)pt_PT
dc.relationUTE – PLANAGEOpt_PT
dc.relationProject UID/GEO/50019/2013pt_PT
dc.relationProject UIDB/50019/2020 – IDLpt_PT
dc.relation.publisherversionhttps://link.springer.com/article/10.1007%2Fs00531-021-02067-zpt_PT
dc.subjectVariscan orogenypt_PT
dc.subjectAnatectic complexpt_PT
dc.subjectAntithetical kinematicspt_PT
dc.subjectChannel fowpt_PT
dc.subjectP–T modellingpt_PT
dc.titleExhumation of an anatectic complex by channel flow and extrusion tectonics: structural and metamorphic evidence from the Porto–Viseu Metamorphic Belt, Central-Iberian Zonept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceKiel, Germanypt_PT
oaire.citation.endPage2201pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage2179pt_PT
oaire.citation.titleInternational Journal of Earth Sciencespt_PT
oaire.citation.volume110pt_PT
person.familyNameBento dos Santos
person.familyNameRodrigues
person.familyNameCotrim
person.familyNamePereira
person.familyNameFerreira
person.familyNamePinto de Meireles
person.familyNameFerreira
person.familyNameGuimarães
person.givenNameTelmo
person.givenNameJosé Feliciano
person.givenNameBeatriz
person.givenNameInês
person.givenNameJoana
person.givenNameCarlos Augusto
person.givenNameNarciso
person.givenNameFernanda
person.identifier.ciencia-idFB13-8A5C-1DBA
person.identifier.ciencia-id791F-5455-453A
person.identifier.ciencia-idC113-4776-D146
person.identifier.ciencia-id901F-23BE-B9E8
person.identifier.ciencia-id1A14-BFCF-0DEA
person.identifier.orcid0000-0003-4589-0222
person.identifier.orcid0000-0001-8246-9379
person.identifier.orcid0000-0002-5309-8094
person.identifier.orcid0000-0001-9028-2483
person.identifier.orcid0000-0002-6076-1149
person.identifier.orcid0000-0002-5130-224X
person.identifier.orcid0000-0002-0105-3329
person.identifier.orcid0000-0001-6961-9256
person.identifier.ridF-8075-2012
person.identifier.scopus-author-id36093841900
person.identifier.scopus-author-id56262014300
person.identifier.scopus-author-id56713517200
person.identifier.scopus-author-id7006652392
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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