论文部分内容阅读
Ｗｏｌｙｕ矿床是Ｙｏｕｎｇｄｏｎｇ地区最大的脉状低温热液Ａｕ－Ａｇ矿床之一，也是朝鲜第一个赋存于硫银锗矿物之中的富锗Ａｕ－Ａｇ矿床。穿切晚石炭纪凝灰岩和石英斑岩（８１．５±１．８Ｍａ）的矿脉（７８．９±１．２Ｍａ）由分属三个矿化阶段的石英和碳酸盐组成。第一矿化阶段的石英和碳酸盐中含有黄铁矿、贱金属和金银矿。第Ｉ矿化阶段的Ａｇ－Ａｕ－Ｇｅ矿脉的矿物组合随着时间演化发生系统的变化：①石英＋黄铁矿；②石英十黄铁矿＋银金矿十辉银矿＋闪锌矿；③碳酸盐十石英＋闪锌矿＋银金矿十辉银矿；④碳酸盐＋自然金＋辉银矿＋银硫矿＋硫银锗矿＋闪锌矿。温度和硫离子活度的计算值为：组合①３６０～２８０℃，１０￣（－７）～１０￣（－１０）；组合②２８０～２１０℃，１０￣（－１０）～１０￣（－１４）；组合③２１０～１８０℃，１０￣（－１４）～１０￣（－１６）；组合④１８８～１５５℃，１０￣（－１７）～１０￣（－１８）。上述数据、金与硫化物紧密共生以及蚀变带中黄铁矿的大量存在都说明了硫离子活度降低和冷却在金的沉淀中起了重要的作用。随着时间演化成矿流体中氢、氧同位素均显示出系统的变化。在主要的Ａｇ－Ａｕ－Ｇｅ成矿过程中，随着石英向碳酸盐的转变δＤ?
The Wolyu deposit is one of the largest veined low-temperature hydrothermal Au-Ag deposits in Youngdong and the first Ge-rich Au-Ag deposit hosted in North Korea. The veins (78.9 ± 1.2Ma) cut through the Late Carboniferous tuff and quartz porphyry (81.5 ± 1.8Ma) are composed of quartz and carbonate belonging to three mineralization stages. The first mineralization of quartz and carbonate contains pyrite, base metals and gold and silver ore. The mineral assemblages of Ag-Au-Ge veins in the first stage of mineralization changed systematically with the evolution of time: quartz + pyrite; quartzite + silver-gold Shihui silver + sphalerite; ③ carbonate ten quartz + sphalerite + silver gold Shihui silver; ④ carbonate + natural gold + gilded silver + silver sulfide + sulfur silver germanium ore + sphalerite. The calculated values of the temperature and the activity of sulfide ions are as follows: Combination ① 360 ~ 280 ℃, 10 ~ (-7) ~ 10 ~ (-10); Combination ② 280 ~ 210 ℃, 10 ~ (-10) ~ 10 ~ (-14) ; Combination ③ 210 ~ 180 ℃, 10 ~ (-14) ~ 10 ~ (-16); Combination ④ 188 ~ 155 ℃, 10 ~ (-17) ~ 10 ~ (-18). The above data, the close coexistence of gold and sulfide, and the presence of pyrite in the alteration zone all indicate that the reduction of sulfur ion activity and cooling play an important role in the precipitation of gold. Over time, the hydrogen and oxygen isotopes in ore-forming fluids show systematic changes. In the main Ag-Au-Ge mineralization process, with the conversion of quartz to carbonate δD?