【作者】 周云； 汪雄武； 陈兵； 秦志鹏； 彭惠娟； 周强；

【Author】 Zhou Yun~1 Wang Xiongwu~1 Chen Bing~2 Peng Huijuan~1 Zhou Qiang~3 (1.Chengdu University of Technology;2.Chengdu Geological Exploration and Geotechnical Engineering Limited Liability Company of China Railway Eryuan Engineering Goup;3.Kunming University of Science and Technology)

【机构】 成都理工大学； 中铁二院成都地勘岩土工程有限责任公司； 昆明理工大学；

【摘要】 陕西省青山金矿床是一个赋存于石炭系沉积岩中的中-小微细粒浸染型金矿床,流体研究表明,成矿流体呈弱酸性、弱还原性,为重碳酸钙亚型,可大致视为CO₂-H₂O-NaCl体系,来源于古大气降水,并且后期受到了大气降水的混合。成矿早期流体中的金主要以氯络合物形式迁移,主成矿期与晚期以硫络合物形式迁移。物理化学条件的变化、流体不混溶、后期大气降水的混合、水-岩反应及硫酸盐还原菌是造成本矿金沉淀的主要因素。更多还原

【Abstract】 Qingshan gold deposit in Shanxi province is a middle-small Carboniferous sedimentary rock-hosted micrograined and disseminated gold deposits.The studies on fluid show that the metallogenic fluid is weakly acid and reduced, calcium bicarbonate type,generally regarded as CO₂-H₂O-NaCl system,mainly derived from ancient meteoric water,and mixed with meteoric water from later period.Cold in the metallogenic fluid are transported as Au-Cl complex in early mineralization period,and transported as Au-S complex in main and late mineralization period.Change of physical-chemical condition, fluid immiscibility,mixing of meteoric water from later period,water-rock reaction and sulfate reducing bacteria are the main factors causing the gold to precipitate.更多还原