云南易门凤山铜矿床“阶梯空当”定位矿体及其构造地球化学异常证据

“Stepladder Blank” Orientation Prognosis of Ore Bodies and TectonoGeochemical Anomaly Evidence in the Fengshan Copper Deposit, Yimen Area, Yunnan

通过易门凤山铜矿床控矿构造解析与13~15中段南部矿体空间位置对比,矿体向SW深部侧伏,预测15中段2、4号矿体的SW端深部具找矿潜力。在纵投影图上,夹持矿体的“空当”呈现“阶梯、斜列、平行、等距”特点,表现出三个“空当”带与四个矿体带相间交替、平行斜列的组合型式。推测“阶梯空当”夹持的四个空白区为有利的找矿地段。在24号勘探线以南、15中段坑道开展1︰500断裂构造地球化学填图,圈定了5个铜异常和3个主要的元素组合（Cu-In-Bi-Hg-Sb）异常,其中,Ⅱ、Ⅲ号异常与“阶梯空当”定位的 d、e 位置相对应,为重点找矿靶区,对凤山铜矿床南部、深部找矿具有指示意义。

Contrasting with the three-dimensional position of ore bodies in the south of No.13 to No.15 levels in the Fengshan copper deposit, the orebodies pitch to the SW direction and extend to at the depth of the Fengshan copper deposit. At the depth of No.2 and No.4 ore bodies in the SW direction of the No.15 level in the Fengshan copper deposit there are prospecting potential. The orebodies on the longitudinal projection profile of orebodies for the Fengshan copper deposit have features of “ladder, en echelon, parallel and equidistance”. There are 3 “ladder and blank” belts and 4 ore bodies belts appear alternatively and paralleled inclining. It could be speculated that the 4 blank areas among “ladder and blank” are the favorable prospecting segments. From the scale of 1∶500 tectono-geochemical mapping in the south of No.24 exploration line on the No.15 level, anomalous areas of Cu and “Cu-In-Bi-Hg-Sb” have been delineated. The SW part in the depth of No.Ⅱand No.Ⅲ anomalous areas is the key prospecting targets. The result is consistent with the orientation prognosis of ore bodies. It would provide good indicative significance for the depth prognosis in the south of the Fengshan copper deposit.