Mathematics – Logic
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esrv...17...31w&link_type=abstract
Earth Science Reviews, Volume 17, Issue 1-2, p. 31-48.
Mathematics
Logic
3
Scientific paper
The principal litho-structural units of the Brazilian Archaean terranes are characterized by mafic-ultramafic complexes, granulitic belts, greenstone belts and gneissic-granitic areas. The lithological, geosynclinal and structural aspects of every unit have been presented as well as their mutual relations. Data are still insufficient for a sure analysis of the current hypotheses about the evolution of Archaean terranes. Neither the genetic and chronological relations between the Atlantic and Goiás granulitic belts and the associated gneissic-granitic areas have been explained, nor whether the greenstone belts implanted in them belong to one, two or even more generations. Important resources of gold, iron and manganese occur in association with these rocks. The large mafic-ultramafic complexes of the State of Goiás may represent fragments of the primitive crust of our planet.
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