Abstract
The Cabaçal gold mineralizations are enclosed within Volcaniclastic rocks of the Alto Jauru Greenstone Belt. Carbonate and quartz-carbonate veins are common associated with the mineralized zone. Calcite is the only carbonate mineral in these veins that are divided in two groups: lenticular or slightly sigmoidal veins that cross cut the main schistosity in a low angle, and fine veins that occur in swarms, cross cut the main rock schistosity, but in a high angle (±90°). Carbon and oxygen isotope data, as well as 87 Sr/ Sr 86 ratios of the Cabaçal carbonate veins indicate that the first group of veins, and the quartz-carbonate veins are related to igneous processes. The second group is believed to have been formed by metamorphic or meteoric fluids, which percolate through extension fractures and interacted with the country rocks after the cessation of the tectonic processes.
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