This paper presents the results of geological mapping undertaken in the Chapada-Campinorte region, northwestern part of the Tocantins Province, which comprises rocks of the Archaean Hidrolina Complex, the Paleoproterozoic Campinorte Volcano-sedimentary Sequence, Mesoproterozoic metasediments from the Serra da Mesa Group and Neoproterozoic supracrustal rocks from the Mara Rosa Volcano-sedimentary Sequence. These lithologies were affected by pre-Brasiliano deformation, as a consequence of north-south compression, followed by the Brasiliano orogenesis. Geochemical and geochronological Sm/Nd data indicate that the Campinorte Volcano-sedimentary Sequence was generated in an island-arc environment during the Paleoproterozoic. This geologic environment, and its close association with the Goias Magmatic Arc (Mara Rosa Volcano-sedimentary Sequence) suggest a tectono-metamorphic geologic evolution involving amalgamation due to the Amazonian and Sao Francisco cratons convergence. Gold mineralizations in the Campinorte Volcano-sedimentary Sequence are hosted by quartz veins controlled by NS strike-slip faults and closely associated to magnetite-rich granite s and diorites.