Publication:
Amazonian Mesoproterozoic basement in the core of the Ibero-Armorican Arc: 40Ar/39Ar detrital mica ages complement the zircon’s tale

dc.contributor.authorGutiérrez Alonso, Gabriel
dc.contributor.authorFernández Suárez, Javier
dc.contributor.authorCollins, Alan S.
dc.contributor.authorAbad, Isabel
dc.contributor.authorNieto, Fernando
dc.date.accessioned2023-06-20T12:53:05Z
dc.date.available2023-06-20T12:53:05Z
dc.date.issued2005
dc.description.abstractThe 40Ar/39Ar age data on single detrital muscovite grains complement U-Pb zircon ages in provenance studies, as micas are mostly derived from proximal sources and record low-temperature processes. Ediacaran and Cambrian sedimentary rocks from northwest Iberia contain unmetamorphosed detrital micas whose 40Ar/39Ar age spectra suggest an Amazonian–Middle American provenance. The Ediacaran sample contained only Neoproterozoic micas (590–783 Ma), whereas the Cambrian sample contained three age groups: Neoproterozoic (550–640 Ma, Avalonian–Cadomian–Pan African), Mesoproterozoic-Neoproterozoic boundary (ca. 920–1060 Ma, Grenvillian-Sunsas), and late Paleoproterozoic (ca. 1580–1780 Ma, Rio Negro). Comparison of 40Ar/39Ar muscovite ages with published detrital zircon age data from the same formations supports the hypothesis that the Neoproterozoic basins of northwest Iberia were located in a peri-Amazonian realm, where the sedimentary input was dominated by local periarc sources. Tectonic slivering and strike-slip transport along the northern Gondwanan margin affected both the basins and fragments of basement that were transferred from Amazonian to northern African realms during the latest Neoproterozoic–earliest Cambrian. Exhumation and erosion of these basement sources caused shedding of detritus to the Cambrian basins, in addition to detritus sourced in the continental mainland. The apparent dominance of Rio Negro–aged micas in the Cambrian sandstone suggests the presence of unexposed basement of that age beneath the core of the Ibero-Armorican Arc.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipSpanish Ministerio de Educacion y Ciencia, Research Projects
dc.description.sponsorshipInternational Geological Correlation Programme 453.
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/69705
dc.identifier.doi10.1130/G21485.1
dc.identifier.issn0091-7613, ESSN: 1943-2682
dc.identifier.officialurlhttp://geology.gsapubs.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/52741
dc.issue.number8
dc.journal.titleGeology
dc.language.isoeng
dc.page.final640
dc.page.initial637
dc.publisherGeological Society of America
dc.relation.projectIDBTE2003-05128
dc.relation.projectIDBTE2003-07867
dc.rights.accessRightsopen access
dc.subject.cdu553.2(46)
dc.subject.cdu56:551.76(46)
dc.subject.keywordIberia
dc.subject.keyworddetrital mica
dc.subject.keyword40Ar/39Ar geochronology
dc.subject.keywordGondwana
dc.subject.keywordEdiacaran
dc.subject.keywordCambrian
dc.subject.ucmGeodinámica
dc.subject.ucmGeología estratigráfica
dc.subject.unesco2507 Geofísica
dc.subject.unesco2506.19 Estratigrafía
dc.titleAmazonian Mesoproterozoic basement in the core of the Ibero-Armorican Arc: 40Ar/39Ar detrital mica ages complement the zircon’s tale
dc.typejournal article
dc.volume.number33
dspace.entity.typePublication
relation.isAuthorOfPublicationa6e74377-1c86-4236-9e6a-72091bd7b56d
relation.isAuthorOfPublication.latestForDiscoverya6e74377-1c86-4236-9e6a-72091bd7b56d
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