论文部分内容阅读
甘肃北山地区金矿床主要有岩浆热液型金矿床和与韧性剪切带有关的金矿床 ,矿化类型为石英脉型和蚀变岩型。金多呈独立金矿物形式出现 ,少许呈分散状 ;金矿物以银金矿为主 ,次为自然金 ,平均成色 772 ;金矿物以粒间金、裂隙金、连生金和包体金等形式嵌布于石英、黄铁矿、方铅矿及闪锌矿等主要载金矿物中 ,且石英较金属硫化物中占优势 ,黄铜矿中未见金矿物 ;金矿物形态各样 ,粒度以中细粒为主 ;碲矿物较为发育。金矿物特征反映出本区金矿床的成矿物质主要来源于变质岩 ,华力西—印支期中酸性岩浆活动是主要的动力源。
The gold deposits in Beishan area of Gansu include mainly magmatic hydrothermal gold deposits and gold deposits related to ductile shear zones. The mineralization types are quartz vein type and altered rock type. Gold mostly appeared in the form of independent gold minerals, with a slight dispersion; the gold minerals were dominated by silver and gold, followed by natural gold with an average fineness of 772; the gold minerals were intergranular, fractured, Form embedded in the quartz, pyrite, galena and sphalerite and other major gold-bearing minerals, and quartz dominate over the metal sulfides, chalcopyrite no gold minerals; gold mineral morphology, particle size Mainly in the fine particles; tellurium minerals are more developed. The characteristics of gold mineralization reflect that the metallogenic materials of gold deposits in this area are mainly derived from metamorphic rocks. The medium-acidic magmatic activity of the Variscan-Indosinian period is the main power source.