Further evidence of Rhyacian arc magmatism in the basement of the Brasilia Belt, western Sao Francisco pericraton

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dc.contributor.authorFilgueiras, Bernardo de Carvalho
dc.contributor.authorde Oliveira, Claudinei Gouveia
dc.contributor.authorCordeiro de Sousa, Isabela Moreno
dc.contributor.authorCordeiro, Pedro
dc.date.accessioned2025-01-23T19:48:01Z
dc.date.available2025-01-23T19:48:01Z
dc.date.issued2020
dc.description.abstractA recently mapped area in central Brazil revealed a slice of Paleoproterozoic basement within Neoproterozoic metasedimentary rocks of the Brasilia Belt. The area, named here the Artulandia area for its proximity to the homonymous village, contains metatonalites and metagranodiorites in tectonic contact with a meta-volcanosedimentary sequence that encompasses felsic, intermediate and mafic metavolcanic rocks interlayered with clastic and chemical metasedimentary rocks. A sample of felsic orthogneiss from the metavolcano-sedimentary sequence, yielded a U-Pb zircon age of 2142 +/- 4.4 Ma, which is interpreted as the crystallization age of the volcanic protolith. Samples from the metagranite unit returned U-Pb zircon ages of 2130 +/- 7.4 Ma for a biotite metatonalite, 2157 +/- 9 for a biotite metagranite, and 2147 +/- 5 Ma for a sulfide-bearing meta-granodiorite, indicating roughly contemporaneous plutonic activity. Whole-rock geochemistry shows calcalkaline signatures for both units, and trace element results are compatible with an extensional setting, such as back-arc or intra-arc, for the metavolcano-sedimentary sequence, and a magmatic arc system for the metagranite unit. These rocks were generated in an episode of juvenile crust formation, as suggested by epsilon(Nd)(2.14Ga) values between 0 and +3.18. Based on lithological association, age and chemical signature, we suggest that the studied rocks represent a lateral continuation of the Campinorte Arc beyond the Rio Maranhao Thrust. Thus, the occurrence of Campinorte Arc rocks on both sides of the thrust argues against the thrust being a Neoproterozoic collisional suture. The geology of the Artulandia area in the context of the Campinorte Arc attests to the complexity of the Rhyacian amalgamation that generated the Sao Francisco Paleocontinent during a Rhyacian Orogeny.
dc.description.funderCoordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES)
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jsames.2020.102739
dc.identifier.issn0895-9811
dc.identifier.urihttps://doi.org/10.1016/j.jsames.2020.102739
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100420
dc.identifier.wosidWOS:000572836100001
dc.language.isoen
dc.revistaJournal of south american earth sciences
dc.rightsacceso restringido
dc.subjectGoias massif
dc.subjectArtulandia area
dc.subjectCampinorte arc
dc.subjectBrasilia belt
dc.subjectRhyacian
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleFurther evidence of Rhyacian arc magmatism in the basement of the Brasilia Belt, western Sao Francisco pericraton
dc.typeartículo
dc.volumen103
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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