Depósito de cu-zn pojuca corpo quatro: IOCG ou VMS?

Abstract

This paper deals about the Pojuca Corpo Quatro Cu-Zn deposit, located in Carajas Mineral Province, in order to establish parameters to define its metallogenic model. The Pojuca Corpo Quatro Deposit is hosted in Igarapé Pojuca Group metavolcanossedimentary rocks, which correlates to Grão Pará Group rocks of Archean age. The metallogenic history of this deposit is complex. Two different types of ore occurrence characterize the deposit, a stratabound mineralization, consistent with the host rock banding and considered primary, and another occurring in breccias, veinlets and disseminated, as described here as a remobilized or a secondary ore. The characteristics of these different types of ore suggest two phases of mineralization, the mineralization is stratabound or primary ore, with paragenesis composed of chalcopyrite, pyrrhotite and sphalerite, is considered here as being VMS type, and remobilized or secondary ore, formed by pyrrhotite, chalcopyrite and molybdenite, described as the product of IOCG ype subsequent hydrothermal events.