江苏栖霞山铅锌矿矿床地质特征及控矿因素

Metallogenic Geological Characteristics and Ore-controlling Factors of Qixiashan Pb-Zn deposit in Jiangsu Province

栖霞山铅锌矿床位于长江中下游坳陷带宁镇断褶束西部,是宁镇多金属成矿亚带的典型产物。区内构造—岩浆活动剧烈,成矿条件优越。通过对区域成矿背景、矿床地质特征的厘定,结合历年勘查资料的综合分析,总结了矿床构造控矿规律,并结合工程验证成果,讨论了找矿方向。研究表明:①矿区主要赋矿层位为中石炭统黄龙组下部的粗晶灰岩段(C 2h 1),并受控于纵向断裂F 2;②矿区构造发育,Si/Ca界面与断裂构造的叠加部位控制着矿体的产出位置、空间展布及形成规模;③主矿体侧伏深部、纵向断裂F 2两侧深部具有较大的找矿潜力。

Qixiashan Pb-Zn deposit is located in the west section of Ningzhen fold-bundle,the lower Yangtze region depression zone,which belongs to the Ningzhen polymetallic mineralization-subzone,the metallogenic conditions is good.Through the analysis of regional geological background and deposit geological characteristics,and combined with the comprehensive analysis of the exploration data over the years,the tectonic ore-controlling regularity of the deposit is summarized.Besides that,the prospecting direction is discussed based on the engineering verification results.The study results show that:①the mainly metallogenic strata of the mining area is the lower of Huanglong Formation of Middle Carboniferous,which controlled by the longitudinal fracture F 2;②structures in the mining area are well developed,and the occurring location,space form and form-scale are strictly controlled by superposition area of Si/Ca interface and fault structure;③the deep of lateral trending of main ore-body and both sides of longitudinal fracture F 2 have the favorable prospecting potential.