山东胶东金矿四位一体成矿地质背景初探

The Discussion on the Quaternity Mineralization Geological Background of Jiaodong Gold Area

摘要: 胶东地区的基底地质构造演化经历了陆核形成期、陆壳增生期和汇聚定型期三个主要阶段，古元古代克拉通化汇聚碰撞作用的形成使得原始的绿岩带矿源岩系活化改造；三叠纪华北板块与扬子板块间陆陆碰撞形成了山东东部的胶南–威海造山带，碰撞造山作用使克拉通地体再活化，二大板块的物质成分在区内重新熔合分配并促使金元素转移富集；侏罗–白垩纪时期太平洋板块对欧亚板块的强烈洋陆俯冲作用，形成了活动大陆边缘俯冲造山带的大陆弧花岗岩，包括玲珑序列二长花岗岩组合、郭家岭序列花岗闪长岩组合、伟德山序列花岗岩组合和崂山序列A型碱性花岗岩组合，这些花岗岩的强烈岩浆活动为金元素迁移成矿提供了热驱动；巨型走滑系统即郯庐断裂带及其巨大的左型走滑系统及其所形成的次级羽状断裂系统为区内金质的运移富集提供了深源通道和合适的沉淀场所。这一特殊的“四位一体”成矿地质背景以及它们的相互作用过程决定并影响着胶东的成矿环境，而这一特征具有唯一性和不可复制性。

Abstract: Basal geological tectonic evolution of Jiaodong area has experienced three main development stages, Continental nuclei formation stage, hyperplasia of continental crust and aggregate shape. The formation of the paleoproterozoic cratonization gathering collision makes the original greenstone belt source rock series of activation modification. Triassic continental collision between north China plate and the Yangtze plate formed Jiaonan-Weihai orogenic belt in eastern Shandong province. And the collision orogeny contributed to the reactivation of craton land body. The fusion distribution of material compositions in two plates controlled the gold elements transfer and enrichment. Oceanic crust subduction from ocean-land Pacific plate to Eurasian plate subduction during Jurassic and Cretaceous, forms the continental arc granite in active continental margin subduction orogenic belt (includes Linglong series, Guojialing series, Weideshan series, and Laoshan series granite). These strong magmatic activities providing a thermally driven gold metallogenic element migration. The main faults is Tanlu faults zone and its huge left-handed strike-slip system and the secondary pinnate faults system. They provide the deep source channel and the precipitation in the right place for the migration enrichment of gold elements. This special “quaternity” metallogenic geological background and their interaction process influence the jiaodong metallogenic environment, and the characteristics are rather unique and unrepeatable.