辽宁东堡子金矿床地质特征及成因

Study on geological features and genesis of the Dongpuzi gold deposit, Liaoning, China

东堡子金矿床是在辽东地区首次发现的次火山岩型金矿。经过初步研究确定是一受火山机构与区域断裂联合控制的次火山岩型浅成低温热液金矿床。矿体赋存在火山机构外侧次火山岩相之粗面斑岩内 ,矿石品位变化大。矿床形成于火山期后的低温热液成矿期。包裹体研究表明成矿温度低 (90～ 2 4 0℃ ) ,成矿部位浅 (2 0 0～ 5 0 0m) ,成矿流体盐度低 (0 35 %～ 6 17% )。该矿属次火山岩型金矿中冰长石

Dongpuzi gold deposit is the first typical subvolcanic gold deposit found in east Liaoning. After preliminary study, Dongpuzi gold deposit is confirmed as a subvolcanic epithmal deposit controlled by a combination of volcanic apparatus and regional faults. Ore bodies are hosted in trachytic porphyry of subvolcanic phase which adjoining the volcanic apparatus and the grade changed greatly. The deposit was mainly formed at hydrothermal metallization stage of the post-volcanic stage. Study on fluid inclusions indicated that the metallogenic temperature of the Dongpuzi deposit ranges from 90～240 ℃,the metallogenic depth is 200～500 m and salinity is 0.35%～6.17%. According to all the evidences mentioned, it's figured that the Dongpuzi deposit belongs to Adulaira-Sericite type subvolcanic gold deposit.