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Os diques maficos do Enxame Para de Minas-MG (1,72 Ga) apresentam-se majoritariamente como diabasios faneriticos e as vezes como corpos porfiriticos, com fenocristais de plagioclasio. Sao litoquimicamente caracterizados como basaltos de alto-titânio, na sua maioria subalcalinos, sendo alguns alcalinos. Guardam anomalias negativas de europio e estroncio associadas ao fracionamento do plagioclasio, bem como anomalias negativas de niobio e razao inicial 87Sr/86Sr elevada aparentemente relacionadas a possiveis processos de contaminacao crustal. Destaca-se sua assinatura de fonte enriquecida em elementos incompativeis tipo OIB (oceanic island basalts). Tais caracteristicas quimicas, em associacao aos registros de fluxo magmatico subhorizontal dos diques e aos processos Estaterianos contemporâneos de rifteamento, sedimentacao e magmatismo bimodal (acido e basico) anorogenico, remetem a atividade de uma pluma mantelica no centro-sudeste do Brasil ao final do Paleoproterozoico. Palavras-chave: Diques maficos, OIB, pluma mantelica, Estateriano, Brasil. Abstract: LITHOCHEMISTRY OF THE PARA DE MINAS MAFIC DYKES RELATED TO A PROBABLE STATHERIAN MANTLE PLUME OF MATO GROSSO-GOIAS (BRAZIL). Mafic dykes of the Para de Minas Swarm-MG (1.72 Ga) are essentially phaneritic dolerites and eventually porphiritic, with plagioclase phenocrysts. The lithochemistry of the dykes shows they are high-Ti subalkaline basalts, but high-Ti alkaline bodies are sometimes also found. All of them keep Eu and Sr negative anomalies related to plagioclase fractionation. Nb negative anomalies and high 87Sr/86Sr initial ratio associated to probable crustal contamination processes can also be verified. They show OIB-like (oceanic island basalts) enriched source signature. Such chemical features in association with their subhorizontal magmatic flow and Statherian contemporary processes of rifting, sedimentation, anorogenic bimodal acid and basic magmatism, refer to the mantle plume activity in the central and southeast Brazil at Late Paleoproterozoic. Keywords: Mafic dykes, OIB, mantle plume, Statherian, Brazil.

LITOQUÍMICA DOS DIQUES MÁFICOS PARÁ DE MINAS (MG-BRASIL) ASSOCIADOS À UMA PROVÁVEL PLUMA MANTÉLICA ESTATERIANA DE MATO GROSSO-GOIÁS