Sergio Mauricio Molano Cárdenas, Graduate Program in Geosciences, Federal University of Rio Grande do Sul, Brazil; Marcelo Cancela Lisboa Cohen, Diana Paola Cárdenas Ruiz, Graduate Program of Geology and Geochemistry, Federal University of Pará, Brazil; Juan Sebastian Gomez Neita, Graduate Program in Geosciences, Federal University of Rio Grande do Sul, Brazil