广西西大明山弄屯铅锌矿床成矿地质特征及找矿前景

Metallogenic characteristics and prospecting potential of Nongtun Pb-Zn deposit in Xidamingshan of Guangxi

弄屯铅锌矿床位于广西西大明山钨-铋-铅-锌-银多金属矿集区北西部。矿床产于寒武系与泥盆系角度不整合面附近地层层间构造破碎带内,为中低温热液充填型矿床。初步发现5条铅锌矿带,圈定144个矿体。矿体走向主要为NE—SW向,倾向SE,倾角相对较陡。矿体形态多呈脉状、似层状或透镜状。厚度、品位变化较稳定,主要为硫化铅锌矿石类型,具有矿石利用性能好等特点。控矿构造主要有NE向及近EW向断裂。其矿床规模较大,具有较好的找矿前景。

Nongtun Pb-Zn deposit is located in the northwestern part of Xidamingshan W-Bi-Pb-Zn-Ag polymetallic ore concentrated area o f Guangxi.It is a low-medium temperature hydrothermal filling type deposit which occurs inside the interformational structural fracture zone around the angular unconformity plane of Cambrian and Devonian system.Preliminarily 5Pb-Zn ore belts are discovered and 144 orebodies are blocked out.The strike of orebodies is along NE-SW trending and it dips southeast with a steep dip angle.The orebodies occur as veined,stratoid and lenticular in form.The variation of depth and grade of the orebodies remains stable,and the orebodies are mainly lead and zinc sulfide ore type which is characterized by easily exploitation and good performance.The ore-controlling structures mainly include NE-trending and nearly EWtrending fractures.The scale of the deposit is large and it has favorable prospecting potential.