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RESUMOS/ABSTRACTS de artigos publicados em revistas com corpo editorial

Stratigraphy of the greenstone belts, Crixas region, Goias, central Brazil 

Jost H.
Oliveira A.M. 

Journal of South American Earth Sciences(1991), 4(3): 201-214. 
Key words: greenstone belt; Archaean; stratigraphy; facies analysis; Brazil; Goias; Crixas

Abstract

Archean rocks in the Crixas region, central Brazil, comprise polydeformed low-grade metamorphic greenstone belt volcano-sedimentary sequences of 2.8 Ga arranged in three subparallel belts separated by domal granitoid gneiss blocks. From west to east the supracrustal belts are named Crixas, Guarinos and Pilar de Goias. A revised stratigraphy is proposed for each belt. Each of the greenstone belts has a gross stratigraphic framework made up of a lower volcanic and an upper sedimentary sequence. Major stratigraphic differences occur among the upper sedimentary sections of the three belts; these are interpreted as resulting from different paleographic settings.