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Eventos distensionais meso-neoproterozóicos no Craton do São Francisco e seus cinturões metamorficos sul-americanos e africanos: uma compilação de idades U-Pb

2016; Sociedade Brasileira de Geologia; Volume: 37; Linguagem: Inglês

ISSN

2177-4382

Autores

Miguel Tupinambá, Nuno Machado, Mônica Heilbron, Diana Ragatky,

Tópico(s)

Geography and Environmental Studies

Resumo

Crystallization and inherited U-Pb zircon ages between 1120 and 815 Ma from basic rocks and related types the Sao Francisco craton and the surrounding Brasilia, Ribeira, Aracuai and West Congo belts are distributed into three extensional events. The first two events (1120-1000 and 930-900 Ma) are represented by mafic dykes and sills and restricted volcanic rocks. The third event (850-815 Ma) is characterized by extrusion of MORB-type tholeiitic basalts. The first two events are possibly related to lithospheric extension, and the last event could be related to ocean opening or extension in back-arc basins.

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