Widely distributed in the Zhenyuan gold deposits and closely related to gold mineralization in time and space,lamprophyres underwent different degrees of alteration and partly experienced mineralization.According to degrees of alteration and mineralization,lamprophyres in the orefield might be divided into fresh (Weakly altered),altered and mineralized ones.According to calculations by the mass balance equation for element activity regularity in tye process of lamprophyic alteration and mineralization,it is shown that fluids responsible for lamprophyric alteration were Si ,Al rich alkaline fluids containing transitional,lthophile,volatile and chalcophile(or ore forming)elements.These fluids are considered to have been products of crystallization of lamprophyric magma.The fluibs responsible for lamprophyric mineralization were enriched in such components as K2O,CaO,CO 2,F,Cl,S,As,Sb,Au,and Ag,thus exhibiting multi source character.