辽宁五龙金矿主成矿阶段成矿持续时限  

Time Span of the Major Ore-forming Stages of the Wulong Gold Deposit, Liaoning

作　　者：魏俊浩[1] 刘丛强[1] 赵永鑫[2] 李志德[2] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002 [2]中国地质大学,武汉430074

出　　处：《地质论评》2001年第4期433-437,共5页Geological Review

基　　金：国家"九五"攀登预选项目(编号:95一预一39);中国科学院地球化学研究所矿床地球化学开放实验室基金

摘　　要：在矿床地质研究的基础上,将五龙金矿的内生成矿作用从早到晚划分为5个成矿阶段,分别为纯石英阶段(Ⅰ)、黄铁矿—石英阶段(Ⅱ)、黄铁矿—辉铋矿—石英阶段(Ⅲ)、多金属硫化物—灰色石英阶段(Ⅳ)、碳酸盐阶段(Ⅴ)。对其中具有工业矿化的第二(Ⅱ)和第四(Ⅳ)主成矿阶段进行了石英流体包裹体Rb-Sr法测年,上述两个阶段年龄值分别为120±3Ma和112±1Ma,说明一个中、大型金矿的形成,其主成矿阶段可能要持续8Ma左右。Sr同位素的初始值(Ⅱ:I_(Sr)=0.71541±0.00008,Ⅳ:I_(sr)=0.71603±0.00006)表明,不同成矿阶段的成矿物质来自同一源区,且以壳源为主。Based on the study of ore deposit geology, the ore-forming process of the Wulong gold deposit was divided into five stages from early to late, the pure quartz stage ( Ⅰ ) , pyrite-quartz stage ( Ⅱ ) , pyrite-bismuthinite-quartz stage ( Ⅲ ) , polymetallic sulfide-quartz stage ( Ⅳ ) and carbonate stage ( Ⅴ ). The Rb-Sr dating of fluid inclusion in quartz of stage I and stage IV gave values of 120Ma and 112Ma. This shows that the time span for the main ore-forming stages of a middle-large scale gold deposit is about 10 Ma. The initial ratios of Sr isotope (stage Ⅱ : ISr = 0. 71541±0. 00008, stage Ⅳ : ISr = 0. 71603 ± 0. 00006) indicate that the ore-forming material of different ore-forming stages came from the same source of continental crust.

关 键 词：流体包裹体 铷-锶等时线 成矿持续时限 五龙金矿床 成矿作用 成矿物质 矿床地质 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]