Genetic implications of fluid inclusions in skarn chimney ore, Las Animas Zn-Pb-Ag(-F) deposit, Zimapan, Mexico

摘要

The chimney of Las Animas, Zimapan mining district presents a vertical zoning with an early chalcopyrite-rich zone, a galena-sphalerite intermediate zone, and a late silver-antimoniures zone. These zones are also characterized by fluids with different properties, indicating a general decrease in temperature from earlier to later zones. Besides, the silver-antimoniures zone present both textural and microthermometric evidences of boiling, with the local presence of unusually Ca-rich fluids.