摘要
本文通过对宝山锑金矿成矿物理化学条件研究,获得成矿温度、压力、成矿流体盐度、氧化还原电位、氧逸度、硫逸度、酸碱度及成份等地球化学参数,表明成矿流体为Ca^(2+)-Fe^(2+)-Fe^(3+)-S^(2-)-CO_2-Au-Sb体系,具弱酸至弱碱性还原环境.氢、氧、硫稳定同位素研究表明,成矿热液(流体)来源于天降水,建造水及岩浆水混合成因,Au、Sb迁移形式为[Au(HS)_2]^-、[Sb(HS)_4]^-及Na_2SbS_3、Na[Au(HCO_3)_2],当成矿介质PH、Eh、压力、温度变化时,络合物破坏,金锑与其他离子反应沉淀成矿.
Based on the study of fluid incluion of Baoshan Sb-Au deposit, the geochemical parameters of the deposit, such as temperature, pressure, fo_2, salinity. PH, Eh and the composition of ore-forming fluid are obtained suggesting that the ore-forming fluid belongs to Ca^(2+)-Fe^(2+)-S^(2-)-Au-Sb-CO_2 system in a weak acid to alkalic and the weak reducing enviroment. The stable isotopic study indicates that the ore-forming solution originated from the mixing of closed hot brine and rainwater and the epimagmatic volcanic hot solution had a great influence on it. [Au(HS)_2]^-, [Sb(HS)_4]^-, Na_2SbS_3 and Na [Au(HCO_3)_2] are the main migrating forms of Sb and Au. During the migrating process, these complexes disassociate and deposit to form ore deposits in the favourable structure where the pressure drops, hot solution boils, H_2S, CO_2 and other gases escape.
出处
《地质找矿论丛》
CAS
CSCD
1992年第4期35-42,共8页
Contributions to Geology and Mineral Resources Research
