湖南大义山岩体白沙子岭矿区钨锡矿深部找矿探索

Deep ore exploration of the Baishaziling tungsten-tin ore district,Dayishan pluton,Hunan

大义山花岗岩体受"大义山式"北西向张扭性断裂构造控制,具多次侵位的特点,与岩体有关的矿产主要为锡多金属矿。本次补勘的白沙子岭锡矿区有云英岩脉型、蚀变岩体型、矽卡岩型等3类锡多金属矿类型。白沙子岭矿段平行排列的矿脉群在平面上整体呈一椭圆形展布,脉群从中间向两侧单脉的长度、厚度、品位逐渐变小,单个脉体从中间向两端厚度、品位逐渐变低。矿脉两端顶底板断层面上见到产状完全相反的擦痕,推断深部存在着一个椭圆形隐伏母岩体,成矿母岩的上部会形成蚀变岩体型矿体。为此本次补勘工作施工了一坑内深钻,上部见到了蚀变岩体型富锡矿体,下部见钨矿,预测深部找矿有较大的找矿前景。

Dayishan granite is controlled by the Dayishan NW- trending tenso- shear fault structure, with the multiple intrusioncharacteristics, and the main mineral deposits related to the granite are tin- polymetallic deposits. There are three types of tindeposits in this prospecting area, i.e., altered greisen vein type, granite type and skarn type. The greisen veins of Baishaziling oreblock in the planar alignments exhibit oval distribution on a flat, and the length, thickness and quality of veins taper from the middle part outwards, and so does the single vein. The veins at both ends of roof and floor present opposite scratches, and hence it isconcluded that there is an oval concealed mother rock body, with its top forming the granite type. For this study the authorsconducted tunnel deep drilling, with rich tin orebody of granite type seen in the upper part, and tungsten orebody seen in the lowerpart. The authors predict that the deep ore exploration has good prospect.