焦家金矿田Ⅰ号主矿体地质特征及找矿方向

Geological Characteristics and Prospecting Direction of No.ⅠMain Orebody in the Jiaojia Gold Deposit

以往对焦家金矿田主矿体研究都是按勘查区进行,具有一定局限性,不能完全揭示主矿体的地质特征。本文利用纱岭矿区、纱岭矿区前陈矿段在赋矿标高-2000m以浅的最新勘查成果,首次打破勘查区概念,将以往各勘查区主矿体凌乱编号统一划分、圈定,对主裂面下盘蚀变、矿化中心部位的碎裂岩及其内赋存的Ⅰ号主矿体地质特征进行重新梳理,系统总结、归纳。发现主断裂控制的含矿地质体产状从地表向深部明显变缓,蚀变带内碎裂岩厚度及矿体形态、规模、品位、厚度与断裂带角度有关。浅部倾角陡,矿体形态呈不规则脉状且分支较多、规模小;深部倾角缓,矿体形态呈似层状、大脉状,规模大。断裂带上盘无明显矿化,下盘以黄铁矿化为主,由内向外产出形态依次为细粒浸染状-浸染状、细脉状、短脉状-细脉、网脉、短脉状。通过总结成矿规律,预测焦家金矿田深部找矿方向主要集中在Ⅰ-3号主矿体深部及按侧伏方位预测深部金矿富集区内,集中在384线至480线,-2000m至-3000m标高之间,预测金资源量300t。

Previous exploration of main ore bodies in the Jiaojia gold deposit was conducted based on exploration area, which has certain limitation and cannot completely reveal the geological characteristics of the main ore bodies. Using the latest exploration results at ore-bearing elevation shallower than -2000 m in the Shaling ore area and Qianchen ore section, this work numbered the previous orebodies uniformly, and summarized the geological characteristics of No. I main ore body which occurs in cataclasite that below the main fracture, which is the first time to break the concept of exploration area. It is found that the occurrence of geological body in deep is much gentler than in shallow which is controlled by the main fracture, and the thickness of cataclasite and the shape, scale, grade and thickness are closely related to the fault. The shallow orebody is more complex and smaller than in deep and the dip angle is steeper, while the deep orebody has gentler dip, and shows layer-like and large vein shape, with a large scale. The mineralization of hanging wall is not obvious, while that of hanging wall is dominated by pyritization, which shows fine-grained disseminated-disseminated, thin vein and short vein-thin vein, net vein and short vein from inside to the outside. By summarizing the metallogenic regularity, it is predicted that the deep prospecting direction of the Jiaojia gold deposit is mainly concentrated in the deep of I-3 main ore body and it is according to the pitch direction to predict the gold enrichment area, which is concentrated between the 384 line and 480 line, between -2000m and -3000m elevation, with 300 tons of predicted gold resources.