东岗山银多金属矿床银的赋存状态的研究

东岗山银多金属矿床有三种类型，其中最重要的是锡石─硫化物型银矿床。银形成于硫化物成矿后期的硫锑铅矿─方铅矿─黄铜矿─银黝铜矿阶段。银的赋存状态有三种：①以独立矿物相即银黝铜矿的形式赋存于主要矿石矿物之中；②以类质同象替代状态产出，并且不排除次显微状银黝铜矿存在的可能性；③在氧化带的下部则为次生的辉银矿。

Occnrrence of Silver in Donggangshan Ag-polymetallic Deposit

There are 3 types of Ag-polymetallic deposits in Donggangshan area in which the most important one is the cassiterite-Ag sulfide deposit.The mineralization of silver is at the late stage of formation of sulfides,i.e.,the stage of the formation of boulangerite-galena-chalcopyrite-Ag-tetrahedrite.Silver has 3 kinds of Occur-rances in the ore:1)in independant mineral phase,Ag-tetrahedrite,in main ore minerals; 2)in isomorphic state but the possibility of its existance in submicrocrystals of tetrahedrite may not be excluded;3)in secondary argen-tite in the lower part of oxidized zone.