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BIBTEX RIS

Meso-neoproterozoic lithospheric extensional events in the São Francisco Craton and its surrounding south American and African metamorphic belts: a compilation of U-Pb ages

2007; Sociedade Brasileira de Geologia; Volume: 37; Issue: S4 Linguagem: Inglês

10.25249/0375-7536.200737s48791

ISSN

2177-4382

Autores

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

Tópico(s)

earthquake and tectonic studies

Resumo

Crystallization and inherited U-Pb zircon ages between 1120 and 815 Ma from basic rocks and related types the São Francisco craton and the surrounding Brasília, Ribeira, Araçuaí 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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