胶东牟乳成矿带板块碰撞成矿作用及找矿方向

Metallogenesis of plate collision and prospecting direction of the Muping-Rushan metallogenic belt,Jiaodong peninsula

胶东牟乳成矿带位于山东半岛的东部,控矿构造为一系列近似平行且等间距的NNE向的断层。对胶东胶莱盆地、东西向构造、牟乳成矿带及其西部变质核杂岩区的金矿床的控矿构造特征进行了研究,并对牟乳成矿带及其西部变质杂岩区的金矿床的成矿时代、地球化学特征进行了对比。研究表明,胶东胶莱盆地、东西向断裂、牟乳成矿带及其西部变质核杂岩区金矿床的控矿构造是伊佐奈岐板块和欧亚大陆板块碰撞过程产生的一系列构造;胶东牟乳成矿带为拆离断层上盘发育的断层系控矿,预测在牟乳成矿带下部,即在拆离断层附近可能存在品位更高、厚度更大的矿床。

The Muping-Rushan metallogenic belt located in the east part of Shandong peninsula and the ore-controlling structure is a series of approximately parallel and equidistant NNE-trending faults.The study on Jiaolai basin,EW-trending faults,Muping-Rushan metallogenic belt and the ore-controlling structure of the gold deposit in its western metamorphic core complex area is carried out.The metallogenic epoch and geochemical characteristics of Muping-Rushan metallogenic belt and the gold deposit in its western metamorphic core complex area are compared.It is found that Jiaolai basin,EW-trending faults,Muping-Rushan metallogenic belt and the ore-controlling structures of the gold deposit which locates in its western metamorphic core complex area are produced by the collision of Izanagi plate and Eurasian plate in Cretaceous.The research shows that the Muping-Rushan metallogenic belt is controlled by the secondary fault system developed in the upper side of the detachment fault.It can be inferred that there may be higher grade and thicker gold orebodies in the deep close to the detachment fault beneath the belt.