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延边北部火山岩型金矿经二十多年普查勘探工作,今已成为吉林省重要金矿基地之一。集多年地质普查勘探和科研的资料成果,汇成此文,供从事火山岩型金矿地质工作的同行们参考。不妥之处,敬请指正。一、火山岩型金矿地质特征 (一)与成矿有关的火山岩特征该区发育的一套晚侏罗世多旋回多阶段形成的英安岩——安山岩——玄武安山岩组合的大陆火山岩,属正常太平洋型钙碱性岩石系列。其主要岩石化学特征值:二氧化硅54—65％,镁铁总量5—13％,含镁系数20—40,全碱5—7.5％,钾比钠0.5—1(个别的>1),里特曼指数1.5—3.3,皮科克指数58—60,久野指数8—24,氧化度一般0.36—0.65。主要造岩矿物有石英、长石(An30—50居多,低有序度),普通角闪石、次
After 20 years of census and exploration work, volcanic gold deposits in the northern part of Yanbian have become one of the important gold mining bases in Jilin Province. Set years of geological survey and scientific research results of the data, Huicheng article, engaged in volcanic gold geological work colleagues for reference. Inappropriate, please correct me. I. CHARACTERISTICS OF VOLCANIC TYPE GOLD MINE (I) Volcanic Features Associated with Mineralization A series of Late Jurassic multi-cycle, volcanic rocks formed from the combination of dacite, andesite and basaltic andesite, Normal Pacific calcareous rock series. Its main petrochemical characteristic values: 54-65% of silica, 5-13% of the total amount of mafic, 20-40% of magnesium, 5-7.5% of all base, and potassium of 0.5-1 (individual> 1) , The Littman index 1.5-3.3, the Peacock index 58-60, the Furuno index 8-24, the degree of oxidation is generally 0.36-0.65. The main rock-forming minerals quartz, feldspar (An30-50 majority, low degree of order), common amphibole, times