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3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和伟德山序列花岗岩组合,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;
Basal geological tectonic evolution in Jiaodong area has experienced three main development periods,they ara continental nucleus formation period,continental crust proliferation period and Continental crust convergence and setting period.The formation of the Paleoproterozoic cratonization convergence and collision made the activation and modification happened in source rock series in original greenstone belt.Triassic continental collision between north China plate and the Yangtze plate formed Jiaonan-Weihai orogenic belt in eastern Shandong.The collision orogeny contributed to the reactivation of craton land body.The fusion distribution of material compositions in two plates made the gold elements transfer and enrichment.Stong oceanic subduction from Pacific Plate to Eurasian plate during Jurassic and Cretaceous period formed the continental arc granite in active continental margin subduction orogenic belt,including monzogranites in Linglong sequence,granodiorite in Guojialing sequence,and granite in Weideshan sequence.These strong magmatic activity provide a thermally driven gold metallogenic element migration.The giant strike slip system,such as Tanlu fault zone and its huge left type strike slip system and its secondary pinnate fault system provide a deep source channel and a suitable precipitation place for the migration and enrichment of gold element.This special"four-in-one"metallogenic geological background and their interaction process influence the metallogenic environment in Jiaodong area.The characteristics are rather unique and unrepeatable.
作者
李洪奎
陈国栋
耿科
李大鹏
单伟
LI Hongkui;CHEN Guodong;GENG Ke;LI Dapeng;SHAN Wei(Shandong Institute of Geological Sciences,Key Laboratory of Gold Mineralization Processes and Resources Utilization Subordinated to the Ministry of Land and Resources,Shandong Key Laboratory of Geological Processes and Re.source Utilization in Metallic Minerals,Shandong Jinan 250013,China)
出处
《山东国土资源》
2018年第5期34-41,共8页
Shandong Land and Resources
基金
国家自然科学基金山东招远-平度断裂带夏甸金矿深部成矿特征研究(41572068)
国土资源部公益性专项胶东招平断裂带深部特征与金矿成矿过程研究(201511029)
全国矿产资源潜力评价项目之山东省成矿地质背景研究(1212010813014-01)
山东地质勘查项目(2012028
2012032)
山东省泰山学者建设工程专项联合资助
关键词
金矿
成矿背景
构造事件
四位一体
山东胶东
Gold deposit
metallogenic background
tectonic events
four-in-one
Jiaodong area in Shandong province
