Tapajós mineral province, Pará, Brazili

Regional Level Types
Tapajós mineral province	Mineral Province
Pará	State
Brazil	Country

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Paleoproterozoic lode gold deposits and related alluvial and eluvial placers. The area straddles the border between Pará and Amazonas states and comprises 140 gold mining sites.

The structural framework of the TMP suggests mutually compressive and extensional deformation, occurring in both ductile and ductile–brittle to brittle regimes. The regional structural orientation is primarily NNW–SSE to NW–SE. Three deformation and thermotectonic events involving the mobilization and accretion of magmatic arcs on a regional scale during the Paleoproterozoic.
The first event (2005–1997 Ma) generated thrust faults with a NNE–SSW orientation and NW–SE, N–S, and NE–SW lineaments, which were overprinted by the subsequent event. The second event (1970–1950 Ma) produced brittle shear zones with primary orientations of NW–SE and NNW–SSE, which are the most prominent in the TMP. The third event (ca. 1900 Ma) created ductile–brittle shear zones with a NNE–SSW orientation, accompanied by auriferous quartz veins. Progressive deformation altered and reactivated NW–SE and WNW–ESE shear zones. A younger extensional brittle event, related to NW-SE shearing, is manifested as extensive E–W and ENE–WSW lineaments in the central-eastern part of the TMP. Subsequent deformation events produced brittle structures and/or were associated with reactivations of older structures, favoring the intrusion of Cambrian mafic dikes.
The TMP encompasses numerous magmatic–hydrothermal deposits of gold associated with Ag, Cu, Pb, Zn, Bi, and Mo, with mineralizations of various types and styles, representing distal, proximal, or dome portions, which are deep or shallow parts of a structurally controlled mineral system. The primary mineralization occurs in quartz veins and, secondarily, in stockwork and disseminations, with all three forms eventually occurring simultaneously (e.g., São Jorge and Cantagalo). Gold is associated with quartz and sulfides (mainly pyrite and chalcopyrite, and subordinately sphalerite, galena, and pyrrhotite), either as sub-microscopic inclusions or in microfractures (e.g., Tocantinzinho, Batalha, and São Jorge). The deposits typically have well-developed hydrothermal alteration halos (e.g., São Jorge, Palito), with fissure alteration (e.g., Cuiú–Cuiú, Batalha), and sericitic alteration zones are most directly associated with mineralization. Ore bodies are primarily located within structures such as shear zones and have a strong spatial correlation with the emplacement of mafic dikes along these structures at contact zones.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

27 valid minerals.

Rock Types Recorded

Rock list contains entries from the region specified including sub-localities