广西箭猪坡锑锌铅矿床构造控矿特征与找矿方向

Ore-controlling structural characteristics and prospecting direction in Jianzhupo Sb-Zn-Pb deposit,Guangxi

位于桂西北丹池成矿带东南端的五圩矿田箭猪坡矿床,是受断裂构造控制的充填型中低温热液矿床。通过野外构造调查,厘定了矿田NNW向断裂的控矿作用,NNW向断裂活动呈多期性,早期以压扭为主,兼具顺时针旋转;晚期以张性为主,兼具逆时针旋转,成矿作用发生在晚期张性阶段。矿脉局部"S"型扭曲部位形成的高引张空间有利于形成厚矿体,矿脉的分支复合、膨大缩小部位等有利于矿化富集,矿化的局部富集与矿体厚度呈负相关。结合矿床地质特征、构造控矿规律等,对箭猪坡锑锌铅矿床深部和外围进行了成矿预测。

The Jianzhupo Sb-Zn-Pb deposit in Wuxu ore field,located in the southeast of the Danchi metallogenetic belt in the northwestern part of Guangxi,is a meso-epithermal filling type deposit controlled by fault structures. According to field structural investigation, the ore-controlling role of NNW fault is delineated and the result indicated that NNW-trending fault shows multi-stages of activities. The early fault dominated with compresso-shear with clockwise rotation, while the later is tension mainly with counter clockwise rotation which is the main metallogenic stage. The high extensional deformation part formed in the curled veins in an S-shape, is favor- able for forming thick ore body. In positions of vein branches compound, expansion, and shrink, mineralization enrichment occur. There is negative correlation between partial mineralization enrichment and orebody thickness. Combined with geological characters of deposit and ore-controlling structural rules, metallogenic prediction for the deep and peripheral positions of Jianzhupo Sb-Zn-Pb deposit was conducted.