云南澜沧铅锌银铜矿床矿物微量元素标型特征

Mineral Minor Element Modal Characteristics of Lancang Pb Zn Ag-Cu Deposit in Yunnan

云南澜沧铅锌银铜矿床为一多金属硫化物矿床。黄铁矿、闪锌矿及方铅矿为矿石中的主要金属矿物。黄铁矿中Ｃｏ、Ｎｉ含量及Ｃｏ／Ｎｉ比值较低，Ｓｅ、Ｔｅ和Ａｓ含量较高。闪锌矿富Ｆｅ、Ｃｄ、Ｉｎ、贫Ｇａ、Ｇｅ和Ｓｅ。方铅矿含银较高，为银的主要载体矿物，贫Ｓｂ和Ｂｉ。矿物的微量元素标型特征反映出该矿床为一形成深度较浅的中温火山～次火山热液矿床。

Lancang Pb Zn Ag Cu deposit is a polymetallic sulfide deposit。Major metal min-erals in ore are pyrite,sphalerite and galena. Co and Ni contents and Co/Ni ratio are low and Se,Te ,As contents are high in pyrite.Sphalerite is enriched in Fe,Cd and In,but Ga,Ge adn Se contents are low,Galena is strongly enriched in silver and is main carryer of silver in ore,however Sb and Bi contents is very low,Mineral minor element model character-istics show that ore forming depth is shallow and the deposit is a volcanic subvolcanic mesothermal deposit.