Abstract
The project is part of a research on mafic-ultramaficrocks which has been performed during the last four decades. The present study refers to four main types of mafic and ultramafic rock associations: the mafic dykes from the cratonic areas of the South American Platform, mainly those from the Amazonian Craton, the large mafic-ultramafic stratiform complexes of Niquelândia and Cana Brava,…