INGEOSUR   20376
INSTITUTO GEOLOGICO DEL SUR
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
La mineralización de las minas Bella Blenda y Cristal Blenda, distrito minero Marayes, provincia de San Juan.
Autor/es:
CASTRO DE MACHUCA, B.; MEISSL, E.; MOGESSIE, A.; BJERG, E. A.; CONTE-GRAND, A.; PONTORIERO, S.; SUMAY, C.; DELPINO, S.; GALLIEN, F.
Lugar:
Río Cuarto
Reunión:
Congreso; MINMET 2010; 2010
Institución organizadora:
AMA y UNRC
Resumen:
The Bella Blenda and Cristal Blenda Pb-Zn-Ag mines, located in south-eastern Sierra de La Huerta, province of San Juan, are replacement vein-type deposits hosted in crystalline basement rocks (mainly marbles). Mineralized samples from these mines have been investigated using a JEOL JSM 6310 electron microprobe and a scanning electron microscope. The study reveals the presence of granular aggregates of pyrite-arsenopyrite-sphalerite±chalcopyrite-galena±tetrahedrite as the dominant metallic phases, with supergene hematite, and quartz-carbonates-chalcedony as gangue minerals. Mineral paragenesis, variations in the Fe content in sphalerite and strong optical and compositional zoning in arsenopyrite and pyrite, suggest that mineralization took place at ≈ 363 ºC (Asp-Py) and that the evolution of the mineralized hydrothermal fluids was a continue process with decreasing temperature.±chalcopyrite-galena±tetrahedrite as the dominant metallic phases, with supergene hematite, and quartz-carbonates-chalcedony as gangue minerals. Mineral paragenesis, variations in the Fe content in sphalerite and strong optical and compositional zoning in arsenopyrite and pyrite, suggest that mineralization took place at ≈ 363 ºC (Asp-Py) and that the evolution of the mineralized hydrothermal fluids was a continue process with decreasing temperature.