山东胶东地区金矿成矿时代研究

摘要

On the basis of studying geological background of gold mineralization and deep prospecting in Jiaodong area,it is summarized and found that Mesozoic tectonic evolution in this region control tectonic-magmatic events, sedimentary environment and mineralization.Magma -deposition -structure -mineralization events have mutual coupling relation with regional tectonic events.Gold mineralization and positioning have close relation with three tectonic episode, they are early Yanshanian period,middle orogenic period and late orogenic period,while have mutual coupling relation with Linglong,Guojialing and Weideshan tectonic -magmatic events.By Statistics, 318 samples of gold mineralization ages in Jiaodong area can be divided into three age concentration range as 105~81 Ma,130~110 Ma and 160~141 Ma.According to mineralization and mutual coupling relation of tectonic-magmatic thermal events,it can be divided into gold molybdenum mineralization under the extrusion environment, gold and silver mineralization under the extensional environment and gold and multi-metal mineralization under the post-orogenic environment.Gold mineralization is concentrated in 120 Ma.Geological environments of Sanshan-dao and Jiaojia gold fields which are world-class are unique and can not be copied.%　　在进行胶东金矿成矿地质背景和深部找矿研究的基础上，总结发现山东胶东地区中生代构造演化对区内的构造—岩浆事件、沉积环境和成矿作用起着制约与控制作用，岩浆—沉积—构造—成矿事件与区域构造事件具有相互耦合性。金矿的形成和定位与燕山期造山早期、造山中期和造山晚期3个构造幕紧密相关，分别与玲珑、郭家岭和伟德山岩体的构造—岩浆热事件相耦合。通过统计胶东已报道的318件金矿成矿年龄样品，划分了105～81 Ma、130～110 Ma 和160～141 Ma 共3个成矿年龄集中区间，按照成矿作用和构造—岩浆热事件的耦合关系，分为挤压环境下的金钼矿成矿作用、挤压—伸展环境的金银矿成矿作用和后造山环境的金—多金属矿成矿作用。胶东地区金矿成矿时代的峰期成矿年龄集中在120 Ma 左右，世界级三山岛、焦家金矿田的成矿地质环境具有独特性和不可复制性。