吉林汪清九三沟金矿床成因研究  

Genesis of Jiusangou gold deposit of Wangqing,Jilin

作　　者：张晓秋[1] 李碧乐[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2014年第2期407-417,共11页World Geology

基　　金：中国地质调查局计划项目(资[2011]02-36-06);国家自然科学基金项目(41272093);吉林省科技发展计划重点项目(20100445)联合资助

摘　　要：九三沟金矿床受控于区域性深大断裂和中生代火山断陷盆地。矿床主要产于石英闪长玢岩内外接触带的破碎角砾岩带中,围岩蚀变以硅化(硅核)和高岭石化为主。电子探针结果显示金主要赋存在黄铜矿中,其次是黄铁矿。流体包裹体研究表明,石英中主要发育气液两相包裹体,成矿流体属H2O-NaCl体系,具低盐度(0.70%～8.79%NaCl)、低密度(0.65～0.97 g/cm3)的特点,主成矿温度为293.4～160.4℃,成矿压力为8.17～40.59 MPa,成矿深度为0.8～4.1 km,氢氧同位素分析显示成矿流体为大气降水和岩浆水的混合流体。九三沟金矿床属于由近酸性、氧化流体形成的高硫化型浅成低温热液金矿床。Jiusangou gold deposit was controlled by regional deep faults and Mesozoic volcanic basin,which mainly produced in the crash breccia with quartz diorite porphyry and outside of the contact zone.Wall rock alteration was mainly silicification （silica core） and kaolinization.Electron microprobe results showed that gold existed mainly in chalcopyrite,followed by pyrite.The study of fluid inclusion showed that there were air-aqueous twophase in quartz,and the ore-forming fluid belonged to H2O-NaCl system with low salinity （0.70％ ～8.79％ NaC1） and low density （0.65 ～0.97g/cm3）.The main formation temperature ranged from 160.4℃ to 293.4℃,the value of pressure from 8.17 to 40.59 MPa,and the ore-forming depth from 0.8 to 4.1 kn.Hydrogen and oxygen isotope analysis showed that ore-forming fluid was mixed with meteoric water and magmatic fluids.Jiusangou gold deposit was a high sulfuration epithermal gold deposit related to closely acidic,oxidizing and low temperature fluid.

关 键 词：九三沟金矿床 矿物学 流体包裹体 矿床成因 汪清 吉林 

分 类 号：P618.51[天文地球—矿床学]