Geochemical and scintillometric characterization and correlation of amethyst geode-bearing Paraná lavas from the Quaraí and Los Catalanes districts, Brazil and Uruguay von HARTMANN, LÉO A., WILDNER, WILSON, DUARTE, LAUREN C., DUARTE, SANDRO K., PERTILLE, JULIANA, ARENA, KARINE R., MARTINS, LAURA C., DIAS, NORBERTO LESSA

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