摘要
栗子沟金矿位于河南省熊耳山变质核杂岩中,矿区内已有矿化类型有Au、Ag、Pb(Ag),显示出矿区内有较大的找矿潜力。笔者以金矿床为研究对象,通过对流体包裹体的分析研究认为,在不同的矿化阶段包裹体类型及包裹体类型组合不同,成矿早期(Ⅰ),流体以高温、高盐度为特征,反映出其来源可能来自深部;在主成矿期(Ⅱ),流体裹包体则表现为均一温度的降低,盐度总体呈现为降低,但变化范围较大18.14‰～0.59%,到了成矿晚期(Ⅲ),成矿流体进一步演化,温度降低,盐度减少。氢、氧同位素研究表明,早期阶段成矿流体的δD为-77.85‰～-70.43‰,应来源于岩浆热液或变质热液;第Ⅱ阶段和第Ⅲ阶段明显偏离岩浆水,向大气水方向飘移。
Located in Xiongershan metamorphic core complex of Henan Province, the Lizigou gold deposit has such mineralization types as Au, Ag and Pb （Ag） and shows considerable exploration potential. An analysis of fluid inclusions has revealed that there exist different types and combinations of inclusions at different ore-forming stages. At the early ore-forming stage （ Ⅰ ）, the fluids were characterized by high temperature and high salinity, suggesting that they might have come from the depth; at the main ore-forming stage （Ⅱ）, the temperature of the fluids dropped, and the salinity was relatively low but varied in a wide range （from 18.14 to 0.59 wt%）; at the late ore-forming stage （Ⅲ）, the ore-forming fluids further evolved, and the temperature and salinity decreased. Hydrogen and oxygen isotope data show that t5 D values of the ore-forming fluids at the early ore-forming stage varied in the range of-77.85 ‰- -70.43‰, implying that they were derived from hydrothermal and magmatic hydrothermal solutions; at Stage Ⅱ and Stage Ⅲ, the fluids obviously deviated from magma water and drifted towards atmospheric water in composition.
出处
《中国地质》
CAS
CSCD
北大核心
2009年第2期450-455,共6页
Geology in China
关键词
金矿
成矿流体
河南
gold deposit
ore-forming fluid, Henan Province
