云南东川雪岭铜多金属矿区深部隐伏矿体预测定位与找矿新发现

摘要

雪岭矿区位于康滇地轴云南段东川矿区南缘,主要出露震旦系和寒武系沉积地层,浅部可见铜多金属脉状矿化沿断裂带和辉绿岩脉产出.结合区域地质演化背景,根据物探和钻孔工程,在矿区深部发现了全隐伏的陡山沱组中的层状铜矿.铜矿物以黄铜矿、斑铜矿为主,主要呈浸染状、网脉状、薄层状和星点状赋存于深灰色破碎状白云岩、黑色炭泥质岩和石英脉中,矿体具明显沉积及热液叠加改造特征.该铜矿与东川滥泥坪矿区所含陡山沱组铜矿相似,反映出东川矿区陡山沱组成矿作用已延续至雪岭深部.综合分析认为,雪岭深部陡山沱组和昆阳群基底均具有较好的找矿前景.%The Xueling mining area is located in the southern part of Dongchuan mining area belonged to the Yunnan section of Kangdian axis,Its exposure stratas mainly are Sinian and Cambrian sedimentary stratas,and the Cupolymetallic vein mineralization cxists in the shallow strata,controlled by faults zone and vein diabase.Based on analysis of regional geological evolution,combining geophysical exploration and borehole engineering,the study found concealed stratiform copper of deep Doushantuo Formation.The copper minerals mainly are chalcopyrite and bornite,which mainly exist as disseminated,net vein,flaggy and starred in dark gray ragged dolomite,black carbon muddy rock and quartz vein,and the ore bodies have obvious features of sedimentation and hydrothermal superposition and reconstruction.By synthetic analysis,the copper deposit in Xueling is similar with the copper deposit of Doushantuo Formation in Lanniping mining area,it reflects that the mineralization in Doushantuo Formation of Dongchuan had spread to the deep of Xueling mining area.After comprehensive analysis,it is concluded that there is a good prospect for exploration in Doushantuo Formation and Kunyang group base in the deep of Xueling mining area.