李梅锌矿床地质特征及其成因

李梅锌矿床是渔塘超大型铅锌矿床的重要组成部分，是近年运用地洼学说预测，经初步验证查明的大型矿床。主要组分锌＞５％，铅很低。矿体主要赋存于下寒武统清虚洞组台地边缘藻礁灰岩相中，为同生构造组合、穹窿、北北东和北西西向地洼构造所控。属多因复成矿床，地台阶段主要是矿源层经压溶作用形成构造压溶热液成矿，在地洼阶段可能是渗流热液成矿，铅锌等成矿物质来自寒武纪碳酸盐围岩，主要成于低温。

GEOLOGIC CHARACTERISTICS AND ORIGIN OF THE LIMEI ZINC SULFIDE DEPOSIT

The economically important Limei zine sulfide deposit of the Yutang massive lead and zine solfide deposit was predicted by the Diwa theory several years ago.The deposit is a polygenetic compound zine sulfide with the Zn content high(exceeding 5%) while the Pb content is very low.The main orebodies which occur in a platform margin algal reeflimestone of Qingxudong Formation(∈1q) are structurally controlled by the dome and diwa structures(NNE-and WNW-trending).During the platform stage,structural pressure solution mineralization occurred owing to the pressure-melting effect of the ore source bed and during the Diwa stage mineralization was vadose hydrothermal mineralization.Ore-forming metals(Zn,Pb) were derived primarily from the carbonate wall rocks.