江西铅山下湖铅(锌、银)矿床地质特征及成因初探

Geologic Characteristics and Genesis of the XiahuLea d-zinc-silver Deposit in Qianshan, Jiangxi Province

下湖铅 (锌、银 )矿区位于武夷山隆起北侧饶南坳陷的黄岗山隆断束与永平—广丰坳断束的接触地带的下湖断陷盆地内。矿体产于侏罗系下统水北组层间破碎带内 ,呈层状、似层状 ,产状平缓、倾角为 9°～ 1 3°,与地层产状基本一致。矿体平均品位 :铅 2 .86%、锌 0 .73%、银60 .8%。主要金属矿物为方铅矿、闪锌矿、黄铜矿等。矿石构造以块状为主 ,次为细脉状、网脉状。矿床成因类型属层控 -叠改型铅 (锌、银 )

The Xiahu lead(zinc-silver) minefield is situated in the Xiahu faulted basin w hi ch exists in the contact zone between the Huanggangshan sheaf-like lifted bloc k and Yongping-Guanfeng packet-like down-warping block of the Raonan Depressio n in the northern side of the Wuyishan Uplift The orebodies are discovered in the ruptured zone of Lower Jurassic Shuibei Formation interlayers, with a dip angl e of 9°-13° and a stratiform and quasi-stratiform They are basically cons on ant with the attitude of strata The average grades of the orebodies are as fol l ows: lead 286%, zinc 073%, silver 608% The major metallic minerals ar e el doradoite, sphalerite, chalcopyrite and so on The ore structures give priority to a massive structure, posteriorly veinlet and network structures The geneti c type of the deposit belongs to the lead(zinc-silver) ore deposit of the stra ta-bound and superimposed and reconstructive type