Voltar
Artigo Acesso aberto Produção Nacional
BIBTEX RIS

COBERTURAS SEDIMENTARES DO MESOPROTEROZÓICO DO ESTADO DE RORAIMA - AVALIAÇÃO E DISCUSSÃO DE SEU MODO DE OCORRÊNCIA

1996; Sociedade Brasileira de Geologia; Volume: 26; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.19964217226

ISSN

2177-4382

Autores

Nélson Joaquim Reis, ALBERTINO DE SOUZA CARVALHO,

Tópico(s)

Geography and Environmental Studies

Resumo

OCCURRENCE In the last few years new data became available from the Middle Proterozoic sedimentary cover in the southern part of the Guyana Shield.Recent studies in continups exposures of Roraima Supergroup sediments, located in the Pacaraima Block (BP), northern part of the Amazon Craton made possible to interpretate its depositional environments, as well the basin evolution.Nevertheless, in the south of this block there are several large table mountain sequences of similar rocks, disconnected from the main preserved basin, that remain very poor known (Tepequém, Urutanim, Uafaranda and Surucucus Table ), wich appear to be outliers of Roraima Supergroup.This paper tries to understand the relationship with both exposures, with emphasis to the environments of deposition and available isotope ages.These proterozoic basins seems to be of multiple age, ranging from 1.7 to 1.4 Ga with gaps of m.y.Associated alluvial deposits are of economic interest due to their gold and diamonds-bearing content.

Referência(s)