Abstract
The San Francisco de los Andes breccia-hosted deposit (Frontal Cordillera, Argentina) is characterized by complex Bi–Cu–Pb–Zn–Mo–As–Fe–Ag–Au mineralization. After magmatic-hydrothermal brecciation, tourmaline and quartz partially cemented open spaces, followed by quiescent periods where Bi–Cu–Pb–Zn ore formed. Bismuth ore precipitation is characterized by Bi-sulfides, sulfosalts, and tellurosulfide inclusions, which temporally co-exist with Ag-telluride inclusions and chalcopyrite. Three distinct Bi mineralizing stages have been defined based on the following mineral assemblages: (1) Bismuthinite (tetradymite–hessite inclusions); (2) Bismuthinite (tetradymite–hessite inclusions) + cosalite (tetradymite inclusions) + chalcopyrite; and (3) Cosalite (tetradymite inclusions) + chalcopyrite. Overall, Ag-poor bismuthinite hosts both Bi-tellurosulfide and Ag-telluride inclusions, whereas Ag-rich cosalite only hosts tetradymite inclusions.
Highlights
The San Francisco de los Andes breccia complex (30°50′08′′ S; 69°35′58′′ W) is located on the
Sulfur and tellurium fugacities during Bi-ore precipitation were constrained by key mineral assemblages formed in equilibrium at a constant pressure of 1 kbar and a minimum temperature of 230 ◦ C, and a maximum temperature of 400 ◦ C
Bismuthinite: This mineral assemblage formed in equilibrium along the bismuthinite–tellurobismuthite monovariant line
Summary
The San Francisco de los Andes breccia complex (30°50′08′′ S; 69°35′58′′ W) is located on the. Cordillera, San Juan province, Argentina ([1,2]; Figure 1). N-oriented range thatcomplex forms part of 08 the Andes and extends from La Rioja to eastern flank of the Frontal Cordillera, San Juan province, Argentina ([1,2]; Figure 1). The San. Cordillera is a N-oriented mountain range that forms part of the Andes and extends from La Rioja to Francisco de los Andes deposit hosts the largest bismuth concentration in a hydrothermal breccia. The San Francisco system in Argentina [3] It is the most important breccia complex in the mineralized district, de los Andes deposit hosts the largest bismuth concentration in a hydrothermal breccia system in characterized tourmaline-cemented anddistrict, veins. It is the most important breccia complex in the mineralized district, de los Andes deposit hosts the largest bismuth concentration in a hydrothermal breccia system in characterized tourmaline-cemented anddistrict, veins. characterized
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