安化县金檀矿区金矿地质特征及成矿作用分析

Analysis of Geological Characteristics and Mineralization of Gold deposits in JintanMining Area,Anhua County

安化金檀矿区属益阳-怀化金钨铅锌铜成矿带之安化烟溪-大榕溪锑钨金成矿区。马底驿组为主要的赋矿地层,潭德溪冲断层(F63)是主要的导、容矿断层,高甲溪断层(F60)为主要的控矿断层,区内新发现花岗细晶岩及蚀变闪长岩与矿脉相伴产出,共圈定单元素异常48处,综合异常区5处。其中Au元素异常9处,Au元素异常值10.02~673.91×10-9,衬度高,异常浓集中心明显。其中AP-Au-1、AP-Au-4、AP-Au-5、AP-Au-9具有外中内三级浓度分带,位于八胡伦—关山地段的AP-Au-1规模较大,具有2处异常浓集中心(Aumax305.85×10-9),异常面积达0.65km2。已发现矿脉6条,圈出2个矿体。按产状可划分为NWW向和近NE向2组。NWW组矿脉为主体,F63为主矿脉,最高品位Au:6g/t。

AnhuaJintan mining area belongs to Yiyang-Huaihua Au-W-Pb-Zn-Cu metallogenic belt of AnhuaYanxi-DarongxiSb-W-Au metallogenic area.The Madiyi formation is the main ore bearing stratum lithology.The Tandexi thrust fault(F63)is the main ore conducting and hosting fault,and the Gaojiaxi fault(F60)is the main ore controlling fault.Producing with the ore vein,the granitic aplite and altered diorite are newly found in the area,of which are 48 single element anomalies and 5 comprehensive anomalies.Among them,there are 9 anomalies of Au element,and the outlier is(10.02~673.91)e-9.In addition,the contrast is highand the abnormal concentration center is obvious.Among them,ap-au-1,ap-au-4,ap-au-5 and ap-au-9 have three concentration zones:outside,middle and inside.Located in the Bahulun-Guanshan section,Ap-au-1 has a large scale,including two abnormal concentration centers(Aumax305.85×10-9)with an abnormal area of 0.65km2.Furthermore,six veins have been found and two orebodies have been circled.According to the occurrence,it can be divided into two groups:NWW and near NE.The main ore vein of NWW formation is F63,and the highest grade of Au:is 6g/t.