山东胶莱盆地金矿成矿条件及找矿方向

Ore-formation Conditions and Exploration Orientation of the Gold Deposite in Jiaolai Basin,Shandong Province

胶莱盆地为中生代形成的地洼盆地,沂沭断裂带和五莲—即墨—牟平断裂带控制了盆地的形成和演化。近年来,在盆地边缘先后发现了蓬家夼、辽上、土堆、宋家沟、大庄子、西涝口等金矿,今年我部在预查找矿中,又发现了莱阳市东夏庄、大黄家等具有进一步工作价值的多金属找矿靶区;胶莱盆地成为胶东地区普查找矿的热点地区之一。通过对盆地形成时间和胶东大多数金矿形成时间进行对比分析,认为胶东金矿的主成矿期与胶莱盆地的强烈拉张期在时间上是一致的,盆地的形成与演化与胶东地区金矿的形成有密切关系;通过分析盆地成矿条件,认为盆地金矿的形成条件与胶北隆起金矿形成条件相似,由此得出盆地的找矿方向。

Jiaolai basin is a Diwa basin which formatted at Mesozoic . The formation and evolution of this basin is controlled by Yishu fault zone and Wulian-Jimo-Mouping fault zone. In recent years, we discoveres six gold deposits,such as Pengjiakuang, Liaoshang, Tudui, Songjiagou, Dazhuangzi, Xilaokou, and so on on the border of the basin. This year , we find Dongxiazhuang and Dahuangjia which has the value for further work in City Laiyang. Jiaolai Basin becomes the hot - spot areas of exploration in Jiaodong. By contrasting and analysising about the time of basin forma- tion and of the times of the main gold deposit in Jiaodong area. we can see that the main mineralization of Jiaodong gold is similar to the strong extending age of Jiaolai basin. , the formation and evolution of the basin closely related to the formation of the gold deposit in Jiaodong. the ore-formation conditions about the gold deposit in the basin and the gold deposit in Jiaobei uplift are unanimous, than we find the prospecting orientations.