云南易门万宝厂铜钴矿床控矿因素及找矿预测

Ore-controlling Factors and Prospecting Prediction of Wanbaochang Copper-cobalt Deposit in Yimen County,Yunnan Province

易门铜矿带是滇中地区重要的铜资源产区,位于武定—元江地区的元古代大陆间裂谷带,成矿条件优越。万宝厂铜钴矿床是易门东铜矿带的典型矿床,受限于矿体品位不高、地表覆盖较厚等因素,总体研究程度不高。在已有成果和野外调查工作成果的基础上,系统总结了矿区及外围成矿地质背景,发现矿床发育典型的沉积成岩型(“铜厂式”)矿体及热液脉状矿体,矿(化)体产于昆阳群落雪组浅色白云岩及因民组紫色白云岩中,受地层层位与断裂构造的双重控制。依据矿床地质、地球物理、地球化学特征综合分析认为矿床西侧的围山田一带找矿潜力较大,为深化易门铜矿带成矿机理研究和找矿工作指明了方向。

Yimen Copper Belt is a significant copper resources producing area in Proterzoic continent rift-zone,which characterized by superior metallogenic conditions.Wanbaochang Copper-cobalt Deposit is a typical deposit in Eastern Yimen Copper Belt which has low research degree,because of low ore grade and thick ground cover.The mettlogenic geological background of the mining area and periphery mining area is summarized based on the previous study results and field investigation working results.The results show that the deposit developed the typical sedimentary-diagenetic ore(’Tongchang’type)and vein type ore,and the orebodies(mineralization)are occurred in pale dolomite of Luoxue Formation and purple dolomite of Yinmin Formation,which are strictly controlled by stratigraphic position and fault structure.According to the geological characteristics,geophysical information and geochemical characteristics,the comprehensive analysis results indicated that the Western Weishantian area has the favorable prospecting potential.The above study results can provide the direction for the study of metallogenic mechanism and prospecting work of Yimen Copper Belt.