山西省吕梁山黄圈塔铅锌矿地质特征及找矿方向

Geological characteristics and prospecting direction of Huangquanta Pb-Zn deposit in Lvliangshan area,Shanxi province

黄圈塔铅锌矿位于吕梁碳酸盐台地的柳林背斜北翼,铅锌矿体主要赋存于下奥陶统三山子组和中奥陶统马家沟组碳酸盐岩中,蚀变和铅锌矿化产于NW向断裂破碎带中。通过对该矿床地质特征、地球物理特征、地球化学特征、矿化蚀变特征的综合研究表明,铅锌矿体主要赋存于NW走向的F1断层破碎带中,矿化以裂隙交代充填型为主,次为蚀变岩型;目前控制有2条铅锌矿体,其中以2号矿体为主,激电测深剖面显示极化率异常向下未封闭,指示深部(埋深150 m)存在极化地质体;勘查区地表未发现与成矿有关的火成岩;矿化成分较为简单,金属矿物主要是方铅矿、闪锌矿,脉石矿物为方解石、白云石,围岩蚀变为中低温矿物组合;矿床成因类型应属中低温热液型铅锌矿床。基于激电测深剖面资料,有必要进一步开展矿区深部找矿工作。

Huangquanta Pb-Zn deposit is located at North limb of Liulin antic line of Lvliang carbonate platform.Ore bodies occur mainly in carbonate rock of Sanshanzi formation of Lower Ordovician Series and in carbonate rock of Majiagou formation of Middle Ordovician Series.Alteration and mineralization are developed in NW fractural zone and Pb-Zn ore bodies mainly in fractural zone of NW fault F1.Fissure filling replacement is the main mineralization,then the altered rock mineralization.Two ore bodies are now lineated of which No.2 ore body is the main one and the polarization anomaly unsealed to depth in the IP sounding profile.To depth about 150 m may exist polarized geological body.There is no igneous rock at surface in the study area.Ore mineralogy is simple.Galena and Sphalerite are the metal minerals,calcite and dolomite the gangue minerals.The wall rock alteration shows medium-low temperature mineral combination.Genetically this Pb-Zn deposit is a meso-epithelial deposit.According to the IP sounding profile should carry out further prospecting work to depth.