新疆东准琼河坝地区斑岩矿床的找矿潜力

Ore-Prospecting Potential of Porphyry Deposits in Qiongheba Area,Eastern Junggar Region,Xinjiang

新疆东准琼河坝地区,位于阿尔曼太蛇绿岩带和卡拉麦里蛇绿岩带之间,是晚古生代火山岩系叠置发育在早古生代岛弧之上的复合岛弧带。近年来先后发现了蒙西、和尔赛、铜华岭、拉伊克勒克等多个斑岩型铜多金属矿床。通过对其矿床地质特征与成岩成矿年龄的研究,认为琼河坝地区构成斑岩矿床的岩体是在早古生代晚期岛弧发育后期碰撞造山过程中形成的;上志留到下泥盆世是区内重要的斑岩型铜多金属矿成矿期;且琼河坝地区具有进一步寻找斑岩矿床的巨大潜力。

Qiongheba area, located between the Altman ophiolite belt and the Kalamaili ophiolite zone, is the complex is- land arc, above which the Late Paleozoic volcanic rocks stacked on the early Paleozoic arc. In recent years has found a number of porphyry type deposits, such as Mengxi, Heersai, Tonghualing, Layikeleke and so on. Through the study of their geological characteristics and the ages of the rock and the mineralization, it is concluded that the plutons in Qiongheba aera are formed during the late collisional orogeny in the late Paleozoic island arc; these age characteristics further evidenced that there is a magma-hrdrothermal mineralization event in this area during the Upper Silurian and Lower Devonian; all these indicate that Qiongheba area has great prospection potential.