论文部分内容阅读
位于巴西中部太古代格伦诺斯（Ｇｕａｒｉｎｏｓ）绿岩带中的玛丽亚拉扎拉（ＭａｒｉａＬａｚａｌａ）金矿由形成韧性剪切带的石英一碳酸盐脉群组成。通过对钾碱性热液蚀变带中的硫化物和含金石英一碳酸盐脉的研究，可以分出两个成矿期：第一期是富硫毒砂的沉淀；第二期是富砷毒砂和铀、啼、金、硫矿物的共生沉淀。根据自然金的产出形态、结构和银含量可确定两种金的类型：一是银含量大于５％的自然金，它晚于富硫毒砂的生成；二是银含量小于３％的金，它与秘、蹄、硫矿物同时生成。
The Maria Lazala gold mine, located in the archaean Guarinos greenstone belt in central Brazil, consists of quartz-carbonate veins that form ductile shear bands. Through the study of sulphide and gold-bearing quartz-carbonate pulse in the K-alkaline hydrothermal alteration zone, two mineralization stages can be separated: the first stage is precipitation of sulfur-rich arsenopyrite; the second stage is Rich arsenic arsenopyrite and uranium, cry, gold, sulfur minerals symbiotic precipitation. According to the output pattern, structure and silver content of natural gold, two types of gold can be identified: one is natural gold whose silver content is more than 5%, which is later than the generation of sulfur-rich toxin sand; the other is gold whose silver content is less than 3% , It with the secret, hoof, sulfur minerals generated at the same time.