Geology of the Riacho do Pontal iron oxide copper-gold (IOCG) prospect, Bahia, Brazil: hydrothermal alteration approached via hierarchical cluster analysis - Huhn, Sérgio Roberto Bacelar; Sousa, Marcelo Janúario de; Souza Filho, Carlos Roberto de; Monteiro, Lena Virgínia Soares (Brazilian Journal of Geology, 2014)