大庄子金矿田地处胶东西北部,是一受构造控制的中低温热液型金矿,其内发育的多金属硫化物石英脉型金矿主要赋存在荆山群斜长角闪片麻岩地层中的节理裂隙构造空间中,通过大量详实的野外地质调查,对矿区-55m中段进行节理统计分析,结果显示控矿节理裂隙主要有NNE、NE、NE3组方向,性质上主要是张性、剪性和张剪复合3种;节理裂隙群的分布具有雁列式、密集平行式、网脉状等规律;控矿节理的分布规律对于就矿找矿有着十分重要的作用,是重要的找矿标志.

大庄子金矿发育蚀变岩型矿化与石英脉型矿化.走向NNE、倾向SEE的压扭性大庄子断裂控制蚀变岩型矿体的发育,而大庄子断裂下盘的次级张扭性断裂构造控制石英脉型金矿体的发育.主次断裂多级构造体系是大庄子金矿主要控矿形式.受构造应力场作用,两种类型的矿体均呈透镜状分段富集.成矿后断裂发育,对两种类型的矿体起破坏作用.对矿体影响较大的是F1断裂,切断了Ⅰ号矿体及部分石英脉型矿体.由于早期对F1断裂构造性质及两盘相对运动方向认识不清,该断裂以北区段,经过多轮的物探、化探和坑探工程实施,一直未发现被切割的Ⅰ号矿体.文中采用构造岩相井下填图方法,把钾长石化带及绿泥石化带确定为找矿信息,使预测目标及找矿标志放大到几倍甚至几十倍.经过实测和构造岩相解析,确定F1断裂两盘发生顺时针运动,北部的1号矿体相对南部的矿体水平向东错动80余m.通过探矿工作验证,发现了被错失的工业矿体,扩大了找矿空间,实现了空白区的找矿突破.

山东平度大庄子金矿发育2种矿化类型:一是蚀变破碎带型矿体,二是多金属硫化物石英脉型矿体。多金属硫化物石英脉型金矿体成矿流体以岩浆水为主,兼有大气降水参与;而蚀变岩型矿体成矿流体为岩浆水与大气降水的混合。石英脉矿化带的流体包裹体均一温度高于蚀变岩型矿化带的均一温度,较深部位的流体包裹体均一温度高于浅部。大庄子金矿目前揭露的矿体处于成矿作用发生时深度较浅、温度相对较低的部位,预测下部仍有较好的工业矿体。

This paper introduce the principle of the electro-adsorption prospecting method and its application status.By using the electro-adsorption prospecting method,several anomalies were found in Mawan gold mining areas,high stackheterozygosity anomalies are mainly concentrated in south-central of the areas,all elements are in good agreement.In order to verify abnormal,three holes are laid in the work area,in which gold orebody are obvious,with maximum depth more than 1 000 m.Comparative study between the abnormal results and drilling results show that the anomalies of electro-adsorption prospecting method can reflect the deep buried ore bodies better than conventional geochemical methods,which can only reflect the outcropping ore body,indicating that the electrosorption method are more effective in searching for buried ore prospecting than conventional geochemical methods.