Paragenetic evolution and fluid regime in the Cu-Co Tarzan system, Carajás Province

• Grant number: 17/25114-0
• Support Opportunities: Scholarships in Brazil - Master
• Start date: May 01, 2018
• End date: February 28, 2019
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Carolina Penteado Natividade Moreto
• Grantee: Rafaela Santeiro de Campos Pinheiro
• Host Institution: Instituto de Geociências (IG). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The Carajás Domain is part of the northern sector of the Carajás Province, in the Pará state, Brazil. Recognized worldwide as one of the largest and most important metallogenic provinces in the world, Carajás stands out for the large number of iron oxide-copper-gold (IOCG) and Cu-Au- (W-Bi-Mo-Sn) deposits. The Cu-(Co) Tarzan deposit is hosted by mudstones, fine- to coarse-grained sandstones, and polymictic conglomerates, representing one of the few deposits of Carajás hosted by (meta)-sedimentary sequences. The mineralization in this deposit comprises vein systems and hydrothermal breccias constituted by chalcopyrite-pyrite-pyrrhotite-cobaltite, differing from other copper deposits of Carajás due to its expressive cobalt content. This study aims to characterize the host and intrusive rocks of the Tarzan deposit, in addition to the mineral paragenesis, based on petrographic descriptions in transmitted and reflected light and scanning electron microscopy. Based on studies of fluid inclusions and stable isotopes (C and O), it is sought to recognize the composition, physicochemical conditions of mineralizing hydrothermal fluids, providing subsidies for the interpretation of their evolution. This study aims to contribute to characterization of polymetallic copper deposits hosted by (meta)-sedimentary sequences, considering that this deposit does not have detailed studies to date. In addition, the goal of this study is to evaluate if the fluid mixing process was responsible for ore precipitation and to understand the role of the paleoproterozoic granitic intrusions (e.g., Central Carajás Granite) regarding heat, metals and fluid sources. (AU)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

PINHEIRO, Rafaela Santeiro de Campos. Paragenetic evolution and fluid regime in the Cu-Co Tarzan system, Carajás Province. 2019. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Instituto de Geociências Campinas, SP.