Abstract
The Jinmen copper deposit, which is situated on the northern margin of the Lanping-Simao back-arc basin, western Yunnan Province, is a silver-bearing, high-grade vein-type copper deposit. Comprehensive element geochemical studies of the host rocks and hydrothermal minerals revealed the regularities in the distribution, mobilization and transport of elements from the host rocks to hydrothermal minerals. In conjunction with the fluid inclusion and isotope data, it is suggested that the ore-forming fluid was derived mainly from a deep source characterized by CO2 enrichment and reduction in nature. It is also suggested that the ore-forming materials come largely from a deep source, although the contribution of the country rocks should not be ruled out.
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