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40Ar/39Ar AGES OF HYDROTHERMAL FLUIDS OF CABAÇAL Au-Zn-Cu DEPOSIT: IMPLICATIONS OF THE CACHOEIRINHA OROGENY ON MINERALIZATION EVENT IN SW AMAZONIAN CRATON

2021; Volume: 40; Issue: 2 Linguagem: Inglês

10.5016/geociencias.v40i02.15655

1980-900X

Mauro César Geraldes, Anderson Costa dos Santos, Colombo Celso Gaeta Tassinari, Bernardino Ribeiro Figueiredo, Carlos Humberto da Silva, Francisco Egydio PINHO,

Geomagnetism and Paleomagnetism Studies

The Cabaçal deposit is located in SW Amazonian Craton, Mato Grosso State, Brazil, with important Au-Zn-Cu mineralization. The ore is hosted by the Alto Jauru orogenic rocks (1.79-1.74 Ga) comprised of felsic volcanic and volcanoclastic rocks and mineralizations occur as bands concordant with the mylonitic foliation, breccias, quartz-carbonate veins and rock-disseminated, and the polymetallic ore comprises chalcopyrite, pyrite, marcasite, pyrrhotite, sphalerite and galena. The mineralization is related to hydrothermal alteration and includes quartz, chlorite, carbonate, sericite and biotite. Six sericite grains from the hydrothermal zones yielded 40Ar/39Ar ages from 1521.3 ± 1.3 Ma to 1510.4 ± 1.2 Ga. These ages are evidence that hydrothermal solutions originated related to the Cachoeirinha orogen (1.58-1.52 Ga) cutting the Alto Jauru orogen (1.79-1.74 Ga) host rocks. Detailed geology and petrography indicate banded iron formation played an important role in the metal deposition as a chemical barrier for the mineralizing fluids.