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八克金矿床以矿体和围岩广泛出现毒砂为典型特征,毒砂、黄铁矿为金的主要共生矿物。对矿体及其围岩中毒砂、黄铁矿进行稀土和微量元素地球化学研究,结果显示矿体中毒砂和黄铁矿的稀土元素总量明显低于围岩的毒砂、黄铁矿,从矿体—近矿围岩—远矿围岩,毒砂、黄铁矿都出现铕的明显负异常,铈无明显异常,反映成矿流体具弱还原性;毒砂、黄铁矿微量元素含量呈现出随着成矿流体从早期到晚期的演化而减少,并普遍亏损高场强元素,富集LREE的特征;通过对黄铁矿、毒砂Hf/Sm、Nb/La和Th/La比值分析,表明八克金矿床成矿流体为富Cl型流体;从研究毒砂、黄铁矿Y/Ho、Zr/Hf和Nb/Ta比值变化范围,表明作用于围岩、矿体中的成矿流体从早期-晚期发生了改变,推测晚期成矿流体可能遭受了外来热液的混入;应用毒砂、黄铁矿中的Co/Ni比值,结合已有数据,表明成矿热液具有多来源的特点,成矿流体来源于大气降水与岩浆水不均匀混合。八克金矿是岩浆热液型的含金石英脉型金矿床。
The gold deposits in the 8g gold deposit are characterized by a wide range of ore bodies and surrounding rock. Arsenopyrite and pyrite are the major symbiotic minerals of gold. Rare earth and trace element geochemistry of the poisoned sand and pyrite in the orebody and its surrounding rock were studied. The results showed that the total amount of rare earth elements in the poisoned sand and pyrite was significantly lower than that of the surrounding rock, pyrite, The obvious negative anomalies of europium appeared from the ore bodies - the ore-bearing rocks - ore-bearing rocks, arsenopyrite and pyrite, with no obvious anomalies of cerium, which reflected the weak reducibility of ore-forming fluids. The contents of trace elements The contents of Hf / Sm, Nb / La and Th / La are all decreased with the evolution of ore-forming fluids from the early to the late stage, and generally depleted in high field strength elements and enrichment of LREE. The ratio analysis shows that the ore-forming fluid of the Au-Au gold deposit is a Cl-rich fluid. From the study of the ranges of Y / Ho, Zr / Hf and Nb / Ta ratios of arsenopyrite and pyrite, The ore-forming fluid changed from the early stage to the late stage, suggesting that the late-stage ore-forming fluids may be contaminated by exotic hydrothermal fluids. The Co / Ni ratio of arsenopyrite and pyrite, combined with the available data, Multi-source characteristics of ore-forming fluid from the precipitation and magmatic water unevenly mixed. The Kat gold deposit is a magmatic hydrothermal gold bearing quartz vein type gold deposit.