黑龙江省二道坎银矿床银的赋存状态及矿床成因

二道坎银矿床是黑龙江省多宝山矿集区内新发现的首个独立银矿床。通过矿相学研究和电子探针测试,确定了该矿床银矿物主要为深红银矿、脆银矿、辉银矿,其他含银矿物有方铅矿、黄铁矿、闪锌矿、锰铅矿、软锰矿。银的赋存状态主要为独立银矿物,其次以亚显微包体、类质同像和离子吸附态形式赋存。独立银矿物嵌布类型有包裹银、粒间银和裂隙银。矿床成因研究表明,热液期为主成矿期,表生期具有次生富集的潜力,热液期的硫化物阶段Ⅰ为主成矿阶段,初步认为该矿床属于浅成低温热液型矿床。

Silver occurrence state and deposit genesis of Erdaokan Silver Deposit,Heilongjiang Province

Erdaokan Silver Deposit is the first independent silver deposit found in Duobaoshan high ore concentration area,Heilongjiang Province.Mineralography study and electronic probe test find that the main silver minerals in the deposit are pyrargyrite,stephanite and argentite,other silver-bearing minerals include galena,pyrite,sphalerite,coronadite and pyrolusite.The silver occurrence state is mainly independent silver minerals,followed by submicrosco-pic inclusion,isomorphism and ionic adsorption.The occurrence type of independent silver minerals includes inclusion silver,intergranular silver and fissure gold.Deposit genesis research shows that the hydrothermal stage is the main me-tallogenic stage and supergene stage bears the potential for secondary enrichment;stageⅠis the main metallogenic stage in hydrothermal fluids stage.The deposit is preliminarily considered to be a hypabyssal low temperature hydrothermal deposit.