Petrography and geochemistry of Proterozoic mafic dykes from the Guiana Shield, northern Amazon Craton Authors A Choudhuri Universidade Estadual de Campinas; Instituto de Geociências DOI: https://doi.org/10.11606/issn.2316-8986.v20i0p41-45 Downloads PDF Published 1989-01-01 Issue Vol. 20 (1989) Section nao definida