黄金科学技术 ›› 2023, Vol. 31 ›› Issue (6): 873-887.doi: 10.11872/j.issn.1005-2518.2023.06.073
• 矿产勘查与资源评价 • 下一篇
宋高瑞(),翟新伟(),王二腾,武磊,陈万峰,郑菲菲,王海东,王金荣
Gaorui SONG(),Xinwei ZHAI(),Erteng WANG,Lei WU,Wanfeng CHEN,Feifei ZHENG,Haidong WANG,Jinrong WANG
摘要:
花牛山金矿位于北山造山带南部,矿体产出于印支期钾长花岗岩脉与大理岩的接触部位,成矿期次可划分为早期矽卡岩期和晚期石英硫化物期(主成矿期)。主成矿期中石英和方解石的流体包裹体性质表明,Ⅰ、Ⅱ阶段成矿流体均具有中低温、中盐、中高密度以及含CO2和CH4的特征,属H2O-CO2-NaCl体系;温度—盐度特征指示成矿流体主要为岩浆水和大气降水混合来源;方解石δ13CV-PDB平均值为1.7‰,δ18OV-PDB平均值为-22.5‰,δ18OV-SMOW平均值为7.69‰,O同位素呈强烈分异特征,暗示着成矿流体为岩浆水和大气降水混合来源。矿石中黄铁矿S同位素δ34S平均值为-9.73‰,其较大的负值或与围岩地层有关,指示该矿床硫源或为岩浆与地层的混合来源。成矿深度及压力特征表明花牛山金矿属于浅成型矿床。综合分析认为,花牛山金矿床为中低温热液交代型(矽卡岩型)金矿床,可能是晚三叠世时期花牛山地区多期次的后造山岩石圈伸展和幔源岩浆底侵作用导致来自深处的成矿流体沿着裂隙断裂向上移动,与围岩发生反应并与大气降水混合,随着压力降低,成矿物质沉淀富集,随之发生金成矿作用。
中图分类号:
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