【摘要】 胶西北金矿床的形成与中生代大规模中酸性岩浆侵位及伴随的热液活动有关,在岩体-热液成矿体系中,温差和氧逸度差引发了天然电流,并导致热液成矿过程中关键性水岩反应具有电化学反应性质。金成矿的关键是Au~+在还原性条件下生成自然金等金矿物。偏酸性还原条件导致了黄铁绢英岩中黄铁矿与绢英岩紧密共生。发育在中生代花岗岩类围岩中的红色蚀变为钾长石化、钠长石化、赤铁矿化、绿泥石化、金红石化、碳酸盐化组合蚀变,围岩胶东群变质岩中则发育青磐岩化蚀变,这两类蚀变均形成于氧化性和偏碱性条件,具地电场阳极性质,为金成矿的来源区和活化区,并与黄铁绢英岩化蚀变和金矿体构成了一种氧化还原性和酸碱性相反的共轭反应体系,形成了天然电解-电离系统。更多还原

【Abstract】 The formation of gold deposit in Northwest Jiaodong is related to large-scale emplacement of intermediate-acidic magmas and hydrothermal activity in Mesozoic.In rock mass-hydrothermal ore-forming system,natural currents are triggered by the temperature difference and oxygen fugacity difference which lead to the key water-rock reaction characterized by electrochemical properties in hydrothermal ore-forming process.The key to gold ore formation is that Au+generates native gold and other gold minerals under reductive conditions.Due to the mildly acidic reductive conditions,pyrite and quartz-sericite intergrow in beresite.The red wall-rock alterations develop in the Mesozoic granitoid include potash feldspathization,albitization,hematitization,chloritization,rutile and carbonatization,and propylitization alteration develops in metamorphic wall-rock of Jiaodong group.These two types of alterations are formed in oxidative and meta-alkalescence conditions with the properties of geoelectric field anodes,and are the source region and the active region of gold ore formation.They build a conjugate reaction system with redox and acid-base properties opposite to each other with beresitization and gold ore bodies,forming a natural electrolysis-ionization system.更多还原