Evidences of the epigenetic mineralization processand geochemical features of Mujiazhuang copper deposit

Although Qinling lead-zinc ores belt related to hydrothermal sedimentary, Zhashan area has more special copper metallogenic background than that of Fengtai area— geological setting, basal of basis. On the basis of fluid inclusions of the Mujiazhuang copper deposit, it is showed that there were two stages of fluid evolution. The first stage is magma hydrothermal with middle temperature, middle and high salinity(CO₂)-H₂O-NaCl fluid, which homogenization temperature are 190~265℃ and salinity 12.5~35.34(wt% NaCl),pressure 12.8～21.3MPa.Meanwhile,a large of three facies fluid inclusions with a salty crystal coexistence to vapour faices inclusions are discovered in the high and middle high temperature steps of homo temperature of fluid inclusions for the Mujiazhuang copper deposit.It is suggested that the mineralization fluid is over-saturation and o ccurring boilization and supposed that there is magma chamber in deep of mining area.