The gabbronorite-charnockite-granite series rocks in the Carajás Province consist of three granitoid varieties: orthopyroxene granodiorite, clinopyroxene monzogranite and amphibole monzogranite; gabbronorites are spatially associated. They occur as a NE-SW-elongated pluton with minor E-W-oriented lenses. In general, the planar fabrics are defined by a NE-SW to E-W trend and steep dip (70–85°) restricted to shear zones. The main mafic phases are pyroxene and amphibole. Biotite is annite with magmatic and subalkaline signature. Plagioclase includes labradorite and andesine. Amphibole thermometers estimates vary from 713 to 800 °C and 765–809 °C in the granitoids and gabbronorite, respectively. Pyroxenes gave higher temperatures of 1194–1573 °C. The pressures were 190–310 MPa during emplacement. The presence of primary magnetite together with geochemical and amphibole-biotite chemical data argues that the studied rocks have crystallized under oxidized conditions (NNO ± 0.5 and NNO +1). The H2O contents are estimated as higher than 4%. The gabbronorite-charnockite-granite series has magnesian affinity, calc-alkaline to high-K calcic-alkaline trends and metaluminous character. The magnesian and oxidized character is inherited from the source, which was likely extracted from a depleted mantle (low HFSE contents). Geochemical modeling shows that the orthopyroxene granodiorite originated by fractional crystallization from a magma akin to the gabbronorite. Water activity was high in the monzogranites, and hydration had an important role in the magmatic evolution of the gabbronorite-charnockite-granite series. The emplacement of these rocks was controlled by a translithospheric-scale shear zone acting as a preexisting conduit for the migration of mantle-derived magmas to epizonal levels (7.0–10.5 km) in a sinistral transpressive regime in a post-collisional setting. Deep crustal levels favor crystallization of orthopyroxene-bearing rocks (poor water conditions), while at shallower crustal levels fluids tend to be dominant in the magma, leading to the generation of amphibole-bearing granite.