The Siderian crust (2.47-2.3 Ga) of the Goias Massif and its role as a building block of the Sao Francisco paleocontinent

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dc.contributor.authorSaboia, Andre Menezes
dc.contributor.authorde Oliveira, Claudinei Gouveia
dc.contributor.authorDantas, Elton Luiz
dc.contributor.authorCordeiro, Pedro
dc.contributor.authorScandolara, Jaime Estevao
dc.contributor.authorRodrigues, Joseneusa Brilhante
dc.contributor.authorCordeiro de Sousa, Isabela Moreno
dc.date.accessioned2025-01-23T19:46:50Z
dc.date.available2025-01-23T19:46:50Z
dc.date.issued2020
dc.description.abstractThe basement of the northern Brasilia Belt, in Central Brazil, is dominated by large volumes of TTG magmatism generated during the Early Paleoproterozoic, and represents a continental block formed prior to the welding of the Sao Francisco paleocontinent during the Rhyacian, holding important information concerning the mechanisms and products of Paleoproterozoic crustal growth and amalgamation. New U-Pb zircon geochronological data was obtained from metagranitoids and mafic-ultramafic intrusions from the Almas-Conceicao do Tocantins Domain (ACTD). This was coupled with geochemical data from the metagranitoids to better constrain the processes of continental crust evolution in this region during the Siderian period. Two main plutonic episodes were recognized in the mapped area: (i) an early suite (2.47 Ga) dominated by tonalites and trondhjemites with subordinate biotite granites (Ribeirao das Areias Complex - RAC); and (ii) a later suite (2.30 Ga) including tonalites and trondhjemites (Ribeirao Itaboca Suite - RIS). Most of the RAC trondhjemite-tonalite-granodiorite (TTG) rocks are marked by fractionated REE patterns with high (La/Yb)(N) = 15-107 and samples have medium to high Sr/Y ratio (28-257). These TTG include both high- and low-Al types and high- and medium-pressure groups. The RIS TTG suite displays higher HREE contents with high (La/Yb)(N) = 65-89 and high Sr/Y ratio (59-95) and contains the high-Al type and the medium pressure group. In spite of the wide age gap between them, both RAC and RIS are characterized by TTG rocks formed in a subduction-like tectonic setting. The biotite granites are related to a magmatic stage after the TTG formation. Mafic rocks of the Gameleira Suite have an abundance of zircon, interpreted as crustal contamination, with dominant (207)pb/(206)pb age populations of 2.48 and 2.30 Ga, and are interpreted to be associated with an extensional magmatic event following the Siderian period. Regional geotectonic correlations within the Sao Francisco Craton based on data compiled from the literature indicate a significant volume of Siderian crust generation that has been overlooked in continental amalgamation models and that TTG magmatism is a more common geochemical signature in Paleoproterozoic rocks than has been previously suggested.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.precamres.2020.105901
dc.identifier.eissn1872-7433
dc.identifier.issn0301-9268
dc.identifier.urihttps://doi.org/10.1016/j.precamres.2020.105901
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100323
dc.identifier.wosidWOS:000589423600049
dc.language.isoen
dc.revistaPrecambrian research
dc.rightsacceso restringido
dc.subjectTTG rocks
dc.subjectBiotite granites and hybrid granitoids
dc.subjectBrasilia Belt
dc.subjectGoias Massif
dc.subjectU-Pb geochronology
dc.subjectWhole-rock geochemistry
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleThe Siderian crust (2.47-2.3 Ga) of the Goias Massif and its role as a building block of the Sao Francisco paleocontinent
dc.typeartículo
dc.volumen350
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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