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Paraíba Ore and the Alta Floresta Gold Province (SW Amazon Craton): Petrography, Pb and S
 Isotopes in Pyrite from Mineralized Vein.

The Paraíba deposit is located at 12 km to northwest of the Peixoto de Azevedo city and lies on the Alta Floresta aurifeous province in the state of Mato Grosso. The region of Peixoto de Azevedo comprises the main prospecting ore of alluvial gold since the end of the 80’s, better known as Filão Paraíba. The body of the ore consists of quartz veins that reach more than 1 meter of thickness, with intense sulphitation in addition to the high content of gold (between 50 and 80g/ton). Metallographic analysis of the polished sections of the gold region allowed us to trace an outline of the mineral phases and thus understand the relationship between mineralization and ore minerals. Stable sulfur and lead radioactive isotopes have allowed the sketching of a metalogenetic model for the region of Peixoto Azevedo. Regarding to the relation to the results of the sulfur isotope analyzes, a minimum value was obtained for % CDT 1.4 and a maximum value of 3.16. Pb /Pb ratios range from 15.87 to 16.82 and Pb / Pb ratios range from 15.40 to 15.53 for the isotope analyzes of lead. The uranogenic plumbotectonic model (Pb/Pb x Pb/Pb) showed a trend in the evolution curve of Pb for upper continental crust and the isochronic age obtained for the analyzed samples was 1814 ± 22 Ma (2σ) and MSWD = 1.6.