Estrutura em quilha Brasil central, uma feicao fundamental na geologia de Goias e Tocantins
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Data
1994-12-01
Autores
Hasui, Y.
Costa, J. B S
Haralyi, N. L E
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Resumo
The older Precambrian geological setting of north Goias/south Tocantins includes three areas of granite-greenstone terrains formed of medium-grade gneisses with associated greenstone belts and nepheline syenitic gneisses, separated by two orogenic belts composing a crustal-scale pop-up structure. The movements were firstly oblique towards NW along the northwestern NNE-SSW-trending Porto Nacional suture, and afterwards of essentially frontal type towards ESE along the southeastern Ceres suture of curved geometry with N-S direction at north and WNW-ESE at the south. The Porangatu block, limited by these sutures, was upthrusted over the neighbouring underthrusted blocks. Three principal kinematic phases are recognized along the orogenic belts. -from English summary
Descrição
Palavras-chave
orogenesis, pop up structure, Precambrian, tectonic evolution, Brazil, Goias, Brazil, Tocantins
Como citar
Geociencias (Sao Paulo), v. 13, n. 2, p. 463-497, 1994.