摘要
吉林东部地区与火山岩-斑岩有关的金(铜银)矿床可分为浅成低温热液型金(银)矿和浅成中温斑岩。热液型金(铜)矿两个亚类。浅成低温热液型矿床的特征矿物组合为黄铁矿、石英、方解石、冰长石和重晶石,成因上与高钾的钙碱性火山岩。斑岩(137～177Ma)有关,成矿流体属浅成低温氧化流体,在成矿过程中大气降水混入的程度大。浅成中温斑岩,热液型矿床的特征矿物组合为黄铁矿、黄铜矿、磁黄铁矿和石英,成因上与钙碱性火山岩。斑岩(130～140Ma)有关,成矿流体属浅成中温还原流体,在成矿过程中大气降水混入的程度相对较小。由于火山岩,斑岩的来源深度不同,斑岩体在矿床的形成中所起的作用不同,成矿流体的性质不同,造成金矿床的类型不尽相同。
Au（Cu-Ag） deposits which are related to volcanic-porphyry can be divided into epithermal lowthermal Au（Ag） deposit and epithermal mesothermal porphyry Au（Cu） deposit in two subgroups.In the eastern region of Jilin Province.The characteristic mineral assemblage of epithermal deposits are pyrite,quartz,calcite,adularia and barite.The cause of formation is related to the high-K calc-alkaline volcanic rocks-porphyry（137 ～ 177Ma）.The ore-forming fluid belongs to epithermal fluid oxidation,atmospheric precipitation mixed with a large degree in the process of mineralization.The characteristic mineral assemblage of mesothermal porphyry deposits is pyrite,chalcopyrite,magnetite and quartz.The cause of formation is related to the calc-alkaline volcanic-porphyry（130 ～ 140Ma）.The ore-forming fluid belongs to mesothermal fluid reduction,atmospheric precipitation mixed with a large degree in the process of mineralization.because volcanic-porphyry has different depth of sources,its porphyry plays a diferent role in deposit＇s formation and its oreforming fluid has different character,it give different style of Au deposit.because volcanic-porphyry has different depth of sources,its porphyry plays a different role in deposit＇s formation and its ore-forming fluid has different character,it give different style of Au deposit.
出处
《吉林地质》
2010年第3期6-8,共3页
Jilin Geology
