The Santa Lúcia Cu-Au deposit, Carajás Mineral Province, Brazil: a Neoarchean (2.68 Ga) member of the granite-related copper-gold systems of Carajás

The Santa Lúcia copper-gold deposit lies in the southeastern portion of Carajás Mineral Province, along NW-SE splays Fault. is hosted by a rhyolitic subvolcanic rock, which crosscut pegmatite intrusions. paragenetic evolution at encompasses an early stage chlorite alteration, followed potassic alteration with microcline, greisenization (quartz-muscovite-tourmaline), ore precipitation, and late sericite hematite vein formation/fracture infill. Copper mineralization dominantly represented chalcopyrite-sphalerite-pyrrhotite-pentlandite-pyrite breccias, are spatially associated greisen characterized enrichment light rare earth elements (LREE), Ni, Co, Cr. types, styles, assemblage suggest that could represent member Paleoproterozoic (ca. 1.88 Ga) granite-related systems (e.g., Breves Estrela deposits). However, situ U-Pb analyses ore-related monazite yield weighted average 207Pb/206Pb age 2688 ± 27 Ma, thereby constraining timing to Neoarchean. Moreover, tourmaline from within zones has range δ11B values − 3.7 0.6‰, therefore linked magmatic boron source. Collectively, these results indicate first reduced magmatic-hydrothermal, iron oxide–poor system formed Neoarchean, coeval 2.72–2.68 Ga metallogenic event responsible for genesis important oxide (IOCG) deposits Province.