论文部分内容阅读
新疆望峰金矿,产于中天山结晶基底中的韧性剪切带内。围岩蚀变和流体包裹体研究表明,成矿过程包括了3个阶段,从早到晚有石英黄铁矿阶段、多金属硫化物阶段和石英碳酸盐阶段,温度分别集中在360~520℃、240~360℃和120~240℃;矿化以第Ⅱ阶段为主。成矿流体的δ18O值变化于1.15‰~2.70‰之间,属于变质热液与大气降水热液的混合流体。包裹体成分表明成矿流体来源较浅,但有利于金矿化;CO2/H2O比值多大于0.026,也有利于成矿。而包裹体捕获压力表明成矿作用发生在5.6~1.2km深度范围,主要发生在1.9km左右;矿化过程与地壳抬升伸展的过程一致,自然亦与碰撞造山体制的矿化规律一致。因此,古生代末期的碰撞造山作用导致了望峰金矿的形成,冰达坂断裂两侧是寻找望峰式金矿的有利地带。石英红外光谱分析表明,CO2光密度(D2)及其与H2O光密度(D1)的比值(D2/D1)普遍较高,指示矿化较强;D2>0.55和D2/D10.26是该区富金样品的标志。
Wangfeng gold in Xinjiang, produced in the Tianshan Mountain crystalline base ductile shear zone. The study of wall rock alteration and fluid inclusions shows that the mineralization process includes three stages. From early to late quartz pyrite stage, polymetallic sulphide stage and quartz carbonate stage, the temperature is concentrated in 360 ~ 520 ℃, 240 ~ 360 ℃ and 120 ~ 240 ℃; mineralization is dominated by the second stage. The δ18O value of ore-forming fluid varies from 1.15 ‰ to 2.70 ‰, belonging to a mixed fluid of metamorphic hydrothermal fluids and hydrothermal fluids. The composition of the inclusions shows that the source of ore-forming fluid is shallow but conducive to gold mineralization; the CO2 / H2O ratio is more than 0.026, which is also beneficial to metallogenesis. The pressure of inclusion shows that the mineralization took place in the depth range of 5.6-1.2 km and mainly occurs at about 1.9 km. The mineralization process is consistent with the process of uplifting and crustal crustal uplift, and is also naturally related to the mineralization law of the collision orogenic system Consistent. Therefore, the collision of the Paleozoic orogeny resulted in the formation of the Wangfeng gold deposit, and the two sides of the Bingdashan fault were favorable areas for finding the Wangfeng gold deposit. Quartz FTIR analysis showed that the optical density of D2 (D2) and the ratio of D2 / D1 to H2O (D2 / D1) were generally high, indicating strong mineralization; D2> 0.55 and D2 / D10. 26 is a symbol of the region’s gold-rich samples.