安徽铜陵焦冲金矿床成矿流体特征及成矿机制  

Characteristics of Fluid Inclusions and Primary Metallogenic Mechanism of Jiaochong Au-S Deposit in Tongling Area,Anhui

作　　者：张志辉[1,2,3] 张达[3] 狄永军[3] 李兴俭[3] 阙朝阳 马先平 杜泽忠[1,2] 

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]国土资源部矿产勘查技术指导中心,北京100120 [3]中国地质大学(北京)地球科学与资源学院,北京100083 [4]紫金矿业集团西北有限公司,乌鲁木齐830026 [5]铜陵紫金矿业有限公司,安徽铜陵244100

出　　处：《吉林大学学报（地球科学版）》2015年第6期1657-1666,共10页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局老矿山技术创新与示范项目(1212011220737);安徽铜陵焦冲金(硫)多金属矿及蛤蟆岭金矿成因及成矿预测研究项目

摘　　要：安徽铜陵焦冲金矿床位于长江中下游铁铜金银铅锌成矿带铜陵矿集区内,矿体主要赋存在下二叠统栖霞组(P1q)灰岩中。根据野外地质特征及含矿组合,将矿床划分为3个成矿阶段:黄铁矿-石英阶段、石英-硫化物阶段和石英-方解石阶段。笔者对该矿床不同成矿阶段石英和方解石进行了详细的岩相学观察和显微测温研究。结果表明,该矿床的均一温度区间分别为410~440℃、320~350℃和260~320℃。显示早期的黄铁矿-石英阶段、石英-硫化物阶段,直到晚期的石英-方解石阶段均一温度呈现逐渐减低的趋势。根据公式计算矿床成矿深度约1.5km,成矿压力400×105 Pa。流体沸腾作用是金属硫化物大量沉淀的主要机制。Jiaochong Au S deposit is located in Tongling ore concentration area which is in the middle and lower reach of Yangtze River .The ore bodies are mainly existed in the limestone of Qixia Group in Early Permian . According to the research of the field geological characteristics and ore composition ,Jiaochong ore was fromed in the three phases :early quartz stage ,middle quartz‐sulfide stage , and late calcite stage . Through the detailed petrographic observation and microscopic measurement to the quartz and calcite of different ore‐forming stages , the fluid homogenization temperatures fall into the three scopes :410 440 ℃ ,320 350 ℃ ,and 260 320 ℃ correspondingly , showing a downward trend from the early quartz stage to the late calcite stage .According to the formula calculation ,the metallogenic depth is about 1 .5 km ;and the mineralization pressure is 400 × 105 Pa . Fluid boiling action was the main mechanism of metal sulfides precipitation .Trapping pressures of fluid inclusion are used to estimate the ore‐forming pressure and depths ,so as to provide a theoretical basis for deep prospecting prediction .

关 键 词：流体包裹体 成矿压力 焦冲金矿床 成矿流体 成矿机制 铜陵矿集区 

分 类 号：P618.51[天文地球—矿床学]