沂沭断裂带构造活动与胶东金矿形成关系之探讨

Study on the Relationship between Tectonic Activity in Yishu Fault Zone and the Formation of Gold Deposits in Jiaodong Area

摘要:

在对沂沭断裂带基本特征、形成演化与动力学特征进行论述的基础上，将与沂沭断裂带相匹配的一系列次级断裂构造统一划分为沂沭断裂带的羽状断裂系统。研究表明沂沭断裂带经历了大规模的左行平移、伸展、拉张及挤压作用，形成了以堑垒构造、盆岭构造、羽状构造系统及大陆边缘花岗岩系为特征的完整构造体系，与之同时伴生形成的胶东地区次级羽状构造系统，既是沂沭断裂带的次级断裂构造，又自成体系，是胶东地区的控矿容矿构造，它们的形成演化受沂沭断裂带的运动学特征和力学特征制约，整体上服从于沂沭断裂带的运动学机制，但又有各自的演化特征和力学特点，是胶东地区金矿形成的赋存场所。沂沭断裂带对胶东金矿的重要成矿贡献在于它不仅提供了幔源的物质来源并参与胶东地区的金矿成矿作用，致使胶东金矿越靠近沂沭断裂带其规模就越大，远离沂沭断裂带其规模就相对较小，这也反映了金矿规模与沂沭断裂带距离远近存在的内在联系。沂沭断裂带的强烈活动不仅形成了与之匹配的羽状控矿系统，为金矿定位提供了空间，而且由于沂沭断裂带切穿地幔而使幔源成矿物质参与了成矿，使胶东金矿越靠近沂沭断裂带其矿床规模越大，共同为成矿流体提供了通道和赋存部位，这是形成区内大型—超大型金矿床形成的关键性因素。

Abstract:

Based on analyzing basic characteristics of Yishu fault belt, formation, evolution and dynamic characteristics, a series of secondary faults which matched with Yishu fault belt have been classified into pinnate fault system.It is showed that Yishu fault zone has experienced largescale sinistral strikeslip movement, extention, pull apart and compression, and formed a complete structural system with graben and horst, basin and range tectonics, pinnatetectonic system and continental margin granites, associated with the formation of secondorder tectonic system. It is not only the secondary fault structure of Yishu fault zone, but also an ore controlling structure. Its formation and evolution are restricted by the kinematics and mechanics of Yishu fault. The whole movements not only obey the kinematics of Yishu fault zone, but also have their own evolution and mechanical characteristics. It is the occurrence place of gold deposit in Jiaodong area. An important contribution of Yishu fault zone to Jiaodong gold deposit is that it not only provides the material source of mantle, but also plays an important role in gold mineralization in Jiaodong area. The scale of gold deposit becomes larger and larger when it is close to Yishu fault belt. It reflects that there is a inner relation of the size between Yishu fault zone and the distance. It also reflects the intrinsic link distance the size and distance of gold yishufault. With the strong activity of Yishu Fault not only formed with matching feather ore control system, to provide a space for the gold location, but also because of the Yishu Fault Zone and the metallogenic material cut through mantle mantle in the Jiaodong gold mineralization, the closer the Yishu Fault Zone of the deposit scale is larger, their common ore fluid supply channel and the occurrence site, this is a key factor in the formation of large superlarge gold deposit formation.