The Sossego iron oxide-copper-gold deposit in the Carajás Mineral Province comprises two major orebodies, Sequeirinho and Sossego. Sodic alteration (albite-hematite) and sodic-calcic alteration zones represented by albite, ferro-edenite/hastingsite (up to 3.8 wt.% Cl), actinolite/magnesiohornblende, magnetite, titanite, epidote, and calcite are predominant at Sequeirinho. Magnetite bodies with envelopes of apatite-rich actinolitite were formed with the sodic-calcic event at high temperatures (~ 500 °C at 1.4 kbar). In the Sossego orebody, potassic alteration with orthoclase and Cl-rich biotite (up to 3.1 wt.%) and chloritization are the main alteration types. Mineralized breccias in both orebodies have coarse-grained zoned actinolite/ferro-actinolite, Cl-apatite, and magnetite within the matrix. Sulfides occur in equilibrium with a paragenetically late calcite-quartz-chlorite-epidote-allanite assemblage. The AlIV contents of the chlorite indicate crystallization at temperatures below 300 °C. Chalcopyrite occurs associated with pyrite (up to 2.3 wt.% Co and 0.2 wt.% Ni), native gold (up to 14.9 wt.% Ag), siegenite, millerite, vaesite, Pd-melonite, and hessite. Dilution and cooling of the hot metalliferous fluid (> 500 °C) by mixing with meteoric fluids may have been the main mechanisms responsible for the deposition of metals transported as metal chloride complexes in both orebodies of the Sossego deposit. © 2008 Elsevier B.V. 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