论文部分内容阅读
本区金矿床的成因与晚中生代花岗岩类有关 ,分布范围广泛 ,分为 3种类型 :矽卡岩型、云英岩型及稀有金属石英脉型 .矿体以脉状、网脉状、浸染状、块状等多种形式出现 .在矿石中早期金多与铁、镍、钴的硫砷化物、砷化物紧密共生 ,晚期金则与含铋矿物共生 (自然铋、辉铋矿、脆硫铋矿、碲化物和硫碲化物 ) .矿石中金为细粒金和次显微金 :在矽卡岩型及云英岩型金矿石中 ,粒径小于 0 .1mm的金占总量的 90 % ,而在稀有金属石英脉型金矿石中则占总量的 6 0 % ,成色介于 40 0～ 95 0之间 .矿石中金分布不均匀 ,特别是在脉型矿石中 ,有时形成矿囊 ,单一矿床金属储量不大 (1～ 30 t) ,平均品位 7× 10 - 6～ 15× 10 - 6 .在温度 36 0～ 2 0 0℃ ,压力 2 0 0 0～ 5 0 0 Pa条件下 ,金 -稀有金属矿化形成于还原环境中 ,溶液中氯化物浓度相对较高 ,砷具有高位能 .地质学、矿物地球化学及温压数据表明 ,金 -稀有金属矿化与大陆边缘岩浆岩弧及碰撞环境中形成的 型钛铁矿和磁铁矿系列的花岗岩类有关 .
The genesis of the gold deposit in this area is related to the Late Mesozoic granitoids and has a wide range of distribution and is divided into three types: skarn type, dolostone type and rare metal quartz vein type. In the early stages of the ore, gold-gold is closely intergrated with sulfur arsenide and arsenide of iron, nickel and cobalt, while late gold is symbiotic with bismuth-containing minerals (natural bismuth, bismuthinite, brittle sulfur Bismuth, tellurides and sulfur tellurides.) The gold in the ore is fine-grained and sub-micro-gold: in skarn-type and fullerene-type gold ores, the total amount of gold with a particle size of less than 0.1 mm 90%, while the rare metal quartz vein type gold ore accounts for 60% of the total, the color is between 40 0 ~ 95 0. The distribution of gold ore uneven, especially in the vein type ore, sometimes formed The reserves of mineral deposits and single deposits are not large (1 ~ 30 t), and the average grade is 7 × 10 - 6 ~ 15 × 10 - 6. At temperatures of 360 ~ 200 ℃ and pressures of 2000 ~ 500 Pa Under the conditions of gold - rare metal mineralization formed in the reduction environment, the chloride concentration in solution is relatively high, arsenic has a high potential. Geology, mineralization of geochemistry And temperature and pressure data show that gold - type ilmenite and magnetite series granitoids and rare metal mineralization continental margin magmatic arc formed in the environment and impact related.