内蒙东风金矿勘查地球化学特征与深部预测

GEOCHEMICAL FEATURES AND PREDICTION OF THE DEEP-SEATED ORE BODIES IN THE DONGFENG GOLD DEPOSIT,INNER MONGOLIA

东风金矿位于华北地台北缘 ,赤峰─朝阳金矿化集中区中部老哈河拗断带内的局部断块隆起中。矿化类型主要是少硫化物的蚀变岩型。矿脉中Hg、Ba、As、Sb、(As +Hg) / (Mo +Pb)、(Hg/Mo) 10 0、F2因子得分值等参数的高值和Mo、Co、Ni、F1因子得分值等参数的低值存在是矿体上部或前缘标志。反之 ,则是矿体下部或无矿的标志。根据上述标志 ,8# 脉 6 380 0～ 6 42 0 0线之间的十中段以下深部可能有新的工业矿化存在 ;8# 脉 6 370 0线附近的金矿体的勘探重点应放在六、七中段 ;2 # 脉的工业矿化在 6 40 0 0线以西向三中段以下有进一步延深 ,但由于被主成矿期后的断层所切 ,其深部的规模不大。

The Dongfeng gold deposit is located in a local rise in the Laohahe depression in the middle of the Chifeng Chaoyang gold metallogenic province at the northern margin of the North China Platform. The deposit belongs to low sulphide altered rock type. In the lodes, the high value of Hg,Ba,As,Sb,(As+Hg)/(Mo+Pb),100(Hg/Mo) and F 2 factor and the low value of Mo,Co,Ni and F 1 factor mark the upper or front part of an ore body. In contrast, mark the low part or the tail of an ore body. Based on the geochemical indications mentioned, in No.8 lode, a new ore body should occur at the deep location under the 10th level between 63 800～64 200 lines whereas at 63 700 line, the new ore bodies should occur at the 6th and 7th levels. Commercial gold mineralization could also be found under the 3rd level at 64000 line in No.2 lode. However, the scale of the new ore bodies to be found should very small for limited structural conditions.