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- W1912291215 abstract "The gold-bearing quartz-carbonate vein deposits of the Cuiaba Mine, northern sector of the Quadrilatero Ferrifero, State of Minas Gerais, SE Brazil, are hosted by a sequence of banded carbonaceous metasedimentary rocks within tholeiitic basalt flows of the Archean Rio das Velhas Greenstone Belt. A regional greenschist metamorphic grade characterizes rocks in this section of the Belt. Episodes of hydraulic fracturing enhanced the focussing of fluids percolating along the host primary layering, which promoted pervasive carbonatization and sulfidation associated with crosscutting fractures and quartz-carbonate veins/breccias. The gold mineralization is closely related to the sulfiderich zones. Fluid inclusion investigations show that the mineralizing fluids were dominantly aqueous, of low salinity (3-6 wt.% NaCleq.), with variable concentrations of CO (0 - 11.4 mol%), CH 4 (1.5 - 10.2 mol%), subordinate N 2 (0 - 0.7 mol%), and traces of H 2 S/HS'. Carbonates in the carbonaceous host rock display heavier 8 13 C compositions (-4.3 to -0.2 0 / oo ) than carbonates in the gold-related, carbonate-sulfide altered zones and associated veins and breccias (-8.1 to -S.5 o / oo ). The range of carbonate a 18 O values in the carbonaceous host rock (12.8 to 16 o / oo ) is broadly similar to the carbonates in the mineralized zones (10.6 to 15.2 o / oo ), with a slightly larger variation in the latter. Collectively, fluid inclusion and carbon isotope data indicate that: (1) the mineralizing fluid was originally composed of a H 2 O-CO 2 , solution, with significant concentrations of CH 4 added via hydrolysis of the carbonaceous matter during vein-fluid/wallrock interaction; (2) sedimentary carbonates, probably of marine origin, are readily distinguished from those carbonates formed by reaction between CO 2 -bearing vein fluids and wallrocks; (3) gold-related vein-fluid CO 2 was relatively homogeneous in isotopic composition, suggesting equilibration with carbonate and reduced carbon reservoir (e.g. mantle-derived magma); (4) gold deposition may have been triggered by a sharp decrease in f O 2 caused by the CH 4 enrichment of the fluid." @default.
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- W1912291215 date "2000-06-01" @default.
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- W1912291215 title "Fluid evolution and gold deposition at the Cuiabá mine, Se Brazil: fluid inclusions and stable isotope geochemistry of carbonates" @default.
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- W1912291215 doi "https://doi.org/10.5327/rbg.v30i2.823" @default.
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