小秦岭东闯金矿构造控矿规律及矿化趋势分析

Structural Controls on Gold Mineralization and its Implications in Ore Prospecting for the Dongchuang Gold Deposit in the Xiaoqinling District

小秦岭金矿田是我国重要的金矿聚集区,东闯金矿是其中典型的碰撞造山带石英脉型金矿之一,其形成受控于秦岭造山带的构造作用机制,主成矿期为燕山期,金矿的形成、演化与分布严格受构造活动尤其是断裂构造的控制。通过对东闯金矿矿床地质、构造特征、成矿期次的研究,对主要矿脉507脉的矿化趋势的分析,建立起矿田构造活动与成矿过程的时空演化关系,总结了矿脉(体)产出受断裂构造控制的机制与规律。这对属于危机矿山的东闯金矿的深部找矿具有现实意义。

The Xiaoqinling metallogenic belt is a very famous ore concentration area for noble metals in China. The Dongchuang gold deposit is a typical large-sized quartz vein type gold deposit in the Xiaoqinling area which was one important part of the Qinling collisional orogenic belt. It formed mainly in the Yanshannian and its mineralization and evolution was controlled by the mechanisms of the Qinling orogenic movement,especially by faulting. Based on the studies of the geology, structural characteristics, metallogenic periods or stages and mineralization tendency of vein No. 507 of the Dongchuang gold deposit,the authors established the temporal and spatial evolutional relation- ship between ore field tectonic activities and ore-forming processes, then summarized the mechanisms of structural ore-control. The results will be very useful for the deep prospecting of this crisis mine.