山东省莱芜市北江水地区铜矿床地质特征及找矿方向

北江水铜矿床位于鲁西重要的铜多金属成矿带内,在分析区域成矿地质背景和矿床地质特征的基础上,着重从构造、地层、岩浆岩等方面分析了控矿因素和找矿标志。利用矿区内最新施工的钻孔资料及物化探资料,对区内矿体的成矿规律、分布特征进行了全面、系统的分析,认为矿床成因类型属于中低温热液型,铜矿体呈脉状严格受北江水断裂控制。区内铜矿体赋存岩性为黄铜矿化石英脉,矿体侧伏方向为NW 300°,矿体沿侧伏方向富集明显,且深部未封闭。区内NW向断裂是重要的导矿、控矿构造,受断裂构造控制的热液型铜矿床,一般具有延深大于延长的特点。认为该区具有良好的找矿前景,指出了找矿方向为研究区西北部及矿体深部。

Geological Characteristics and Prospecting Direction of Beijiangshui Copper Deposit in Laiwu City of Shandong Province

Beijiangshui area in Laiwu city is located at the joint site between Taishan uplift and Tailai sag in North China plate with good oreforming condition. The copper deposit occurred in quartz veins controlled by the faults with the trend of NW(F2). Based on comprehensive analysis of regional geology and geological characteristics of ore bodies in Beijiangshui area, combining with the summary of the origin and prospecting signs of the deposit, it is regarded that this deposit belongs to quartz veintype copper deposit, and the ore body has a tendency to be sideways to the northwest. The occurrences of copper ore bodies in the area are chalcopyrite and fossil veins. The lateral direction of the orebody is 300°with the trend of NW. The ore bodies are enriched obviously in the pitch direction and closed in the deep part. Faults with the trend of NW are important ore guiding and ore controlling structures. Hydrothermal copper deposits controlled by fractural structures generally have the characteristics of longer depth than longer extension. It is pointed out that the copper deposit has the possibility of thickening and thickening in the deep part of F2 fault. It will point out the prospecting direction in the next exploration work.