诸城市叶家沟铜矿地质特征及找矿方向

Geological Characteristics and Prospecting Direction of Yejiagou Copper Deposit in Zhucheng City

摘要:

叶家沟铜矿位于沂沭断裂带、胶南隆起、胶莱凹陷接合部位，地层主要为中生代莱阳群曲格庄组，构造以断裂为主，岩浆岩发育，成矿地质条件较好。矿体受近EW向郝戈庄断裂之次级断裂控制，呈透镜状，长170m，厚度0.80～2.74m，平均厚度1.56m，赋矿岩石为角岩化长石砂岩或方柱透辉石角岩，矿化不均匀，有用成分Cu含量0.62%～1.93%，矿石矿物为孔雀石、蓝铜矿；变余粒状结构、角岩结构，块状、碎裂状构造，伴生有益组分Ag达到指标要求。矿床成因为次生氧化淋滤型。

Abstract:

Yejiagou copper deposit located in the combination section of Yishu fault belt, Jiaonan uplift and Jiaolai depression. Its strata are mainly Qugezhuang formation of Mesozoic Laiyang group. Its strctures are mainly composed of faults, magmatic rocks developed well, and geological conditions of oreforming are good. Ore bodies are controlled by the secondary fault of Haogezhuang fault with the trend of EW. It occurred as lenticular type with the length of 170m, the thickness of 0.80~2.74m and average thickness of 1.56m. Orebearing rocks are hornfels arkose or square columns diopside hornfels, and the mineralization is uneven. Its useful component of Cu content is 0.62%~1.93%. Ore minerals are malachite and azurite; granular structure, hornfels texture and massive fragmentationlike structure associated with the beneficial components of Ag which can reach the standard. The origin of deposits is the secondary oxidation leaching type.