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Geochemical and isotopic (SmNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin

dc.contributor.authorFuenlabrada Pérez, José Manuel
dc.contributor.authorArenas Martín, Ricardo
dc.contributor.authorSánchez Martínez, Sonia
dc.contributor.authorDíez Fernández, Rubén
dc.contributor.authorPieren Pidal, Agustín Pedro
dc.contributor.authorPereira, M. Francisco
dc.contributor.authorChichorro, Martim
dc.contributor.authorSilva, José B.
dc.date.accessioned2023-06-16T15:16:12Z
dc.date.available2023-06-16T15:16:12Z
dc.date.issued2020-02
dc.description.abstractThe geochemical and isotopic (SmNd) features of the Ediacaran-Cambrian siliciclastic series from the Central Iberian Zone and the Iberian Allochthonous Domains indicate a significant paleogeographic change at the northern margin of Gondwana, associated with the development of the Avalonian-Cadomian arc. During the Neoproterozoic, the opening of a peri-Gondwanan back-arc basin and its subsequent widening during the Cambrian led to a progressive separation of the sedimentary basins from the main focus of the probably waning Cadomian magmatic arc activity. This work presents a paleogeographic reconstruction of the distribution of the Iberian terranes along the North Gondwanan margin during Ediacaran and Cambrian times, based on the geochemical and Nd-isotope data from the Iberian Allochthonous and Autochthonous Domains. These results suggest a location close to the West Africa Craton for both the allochthonous and autochthonous terranes, but they would be distributed laterally along the northern margin of Gondwana, occupying arc- or continental-ward positions within a wide back-arc basin. In this context, the peri-Gondwanan volcanic arc acted as the main supplier of the abundant juvenile material, as reflected in positive values of εNd and young TDM model ages (720–1215 Ma) of the Middle Cambrian siliciclastic series from NW Iberia Upper Allochthonous Units. On the other hand, the rather equivalent geochemical and isotopic features of the sedimentary series of the NW and SW Iberia Basal Allochthonous Units suggest a common paleolocation for those series, yet within the back-arc basin but closer to the mainland and older isotope sources. The sedimentary series of these terranes present the oldest TDM ages (1499–2156 Ma), clearly greater than the TDM ages that characterize coeval sedimentary series of the Iberian Autochthonous Domain (1256–1334 Ma). This finding allows us to place Iberian Basal Allochthonous Units very close to the West Africa Craton, from where they received a dominant contribution of old crustal materials, whereas the Iberian Autochthonous Domain occupied a more eastern paleoposition closer to the Sahara Metacraton.
dc.description.departmentDepto. de Geodinámica, Estratigrafía y Paleontología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía, Industria y Competitividad
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/59444
dc.identifier.doi10.1016/j.earscirev.2019.103079
dc.identifier.issn0012-8252, ESSN: 1872-6828
dc.identifier.officialurlhttps://www.sciencedirect.com/science/article/pii/S0012825219304908?via%3Dihub
dc.identifier.relatedurlhttps://www.sciencedirect.com/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6082
dc.issue.number103079
dc.journal.titleEarth-Science Reviews
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDCGL2016-76438-P
dc.rights.accessRightsrestricted access
dc.subject.cdu551.24:550.4(46)
dc.subject.cdu552.4:550.4(46)
dc.subject.keywordIberian Massif
dc.subject.keywordSm-Nd isotope geochemistry
dc.subject.keywordEdiacaran-Cambrian metasedimentary series
dc.subject.keywordAutochthonous domain and allochthonous units
dc.subject.keywordAvalonian-Cadomian active margin
dc.subject.keywordGondwana paleogeography
dc.subject.ucmGeodinámica
dc.subject.ucmGeología estratigráfica
dc.subject.ucmGeoquímica
dc.subject.ucmPetrología
dc.subject.unesco2507 Geofísica
dc.subject.unesco2506.19 Estratigrafía
dc.subject.unesco2503 Geoquímica
dc.titleGeochemical and isotopic (SmNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
dc.typejournal article
dc.volume.number201
dspace.entity.typePublication
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relation.isAuthorOfPublication.latestForDiscoverya08b4ec4-c32a-4ee2-800a-7b5842bda48e
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