Artigo

Geologia, geocronologia e litoquímica dos granitos paleoproterozóicos do tipo A no setor setentrional da Província Tocantins

This work presents the geologic characterization of the Ipueiras Intrusive Suite, which comprises four granitic plutons, named do Carmo, Areias, Ipueiras and Itália, located in Goiás Massif, northern sector of the Tocantins Province. New petrographic, litogeochemical, geocronological and isotopic da...

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Autor principal: CHAVES, César Lisboa
Outros Autores: GORAYEB, Paulo Sérgio de Sousa, MOURA, Candido Augusto Veloso
Grau: Artigo
Idioma: por
Publicado em: 2015
Assuntos:
Acesso em linha: http://repositorio.ufpa.br/jspui/handle/2011/6454
Resumo:
This work presents the geologic characterization of the Ipueiras Intrusive Suite, which comprises four granitic plutons, named do Carmo, Areias, Ipueiras and Itália, located in Goiás Massif, northern sector of the Tocantins Province. New petrographic, litogeochemical, geocronological and isotopic data had allowed to discriminate these plutons of other granites of the region. Lithochemical data showed that they are peraluminous subalkaline granites, with A-type affinity. Single zircon Pb-evaporation data indicate an age of 2,08 Ga for this magmatism. Sm-Nd (TDM) ages between 2,15 and 2,19 Ga, and positive εNd(2,08 Ga) values (+2,5 to +2,9) for the Areias and Ipueiras granites suggest an origin involving juvenile mantle components. This granitogenesis may be related to the last magmatic pulses of the Transamazonian thermotectonic event, well defined in the region.