胶东-朝鲜半岛中生代金成矿作用

Mesozoic gold mineralization in the Jiaodong and Korean peninsulas

华北克拉通东部与朝鲜半岛相接,是中朝克拉通的重要组成部分。在华北克拉通东部的胶东半岛和朝鲜半岛内皆产出有不同规模的金矿床,并具有显著的地域特色。胶东半岛已发现金矿床（点）近200处,其中三山岛、焦家、新城、玲珑等为世界级金矿,它们为石英脉型和受构造控制的蚀变岩型,成矿时间主要集中在～120Ma,说明金成矿作用是在相当短的时间内,在同一成矿背景下和同一构造-岩浆-流体成矿系统下完成的。成矿流体主要来自幔源岩浆以及幔源岩浆与地壳相互作用产生的地质流体,就位环境与地壳/岩石圈在早白垩世强烈伸展构造变形有关,为克拉通破坏型金矿;与我国辽东相邻的朝鲜半岛北部平安北道等地金矿储量较大,成矿类型与特征辽东五龙金矿类似,为石英脉型矿化,也可能为早白垩世与华北克拉通岩石圈减薄、破坏相关的金矿床;朝鲜半岛南部的韩国金（银）矿床分成侏罗纪中温热液型和白垩纪浅成低温热液型两类,其中侏罗纪热液脉状金矿成矿特征虽与胶东金矿类似,但成矿时代（峰期～160Ma）有显著差异。而白垩纪浅成低温热液型金-银矿化主要发生在100～70Ma,与太平洋板块俯冲作用相关,为典型的环太平洋斑岩-次火山活动有关的浅成低温贱金属成矿系列。胶东和朝鲜半岛金矿床类型、特征及成矿时间的异同,与区域中生代地质演化及地球动力学背景密切相关。

Eastern North China Craton（ NCC） is connected with Korean Peninsula,constituting an important part of Sino-Korea Craton.Different scales of gold deposits with significant regional characteristics have been found in the Jiaodong Peninsula of NCC and Korean Peninsula.More than 200 gold deposits/spots within Jiaodong Peninsula,including world-class Sanshandao,Jiaojia,Xincheng and Linglong gold mines,have been explored.Two types of gold deposits at Jiaodong are widely accepted,namely quartz vein-style and structurally controlled altered rock-style.Geochronology demonstrated that these gold mineralizations were happened in a short time interval around 120 Ma.All gold deposits were formed at the same tectono-magma-fluid geodynamic background.Auriferous fluids were come from mantle-derived magma or interaction between mantle-derived magma and crust.Gold mineralization took place in the extensional tectonic settings at crust/lithosphere in the Early Cretaceous.The deposits at Jiaodong were called decratonization gold deposits.Pyonganbuk in the North Korean,adjoining Liaodong,hosts several tens gold deposits and gold resource are huge.Gold occurrence and mineralization type are similar to Wulong gold deposit in the neighbour Liaodong.This quartz vein type gold mineralization might be also connected with lithospheric thinning and craton destruction of NCC at Early Cretaceous.The gold-silver deposits in South Korea can be classified into Jurassic mesothermal and Cretaceous epithermal styles of mineralization.Gold occurrence of Jurassic lode mineralization in South Korea is similar to that at Jiaodong with remarkable discrepancy of mineralizing peak around～ 160 Ma.The Cretaceous gold-silver deposits in South Korea were mainly formed at 100 ～ 70 Ma,and associated with the subduction of the Pacific plate.The deposits are belonged to typical epithermal base metal metallogenic series related to hydrothermal systems around porphyry and sub-volcanic activity.Similarities and differences among type,occurrence and mineralizing time of gold deposits in the Jiaodong and Korea peninsulas are closely related with Mesozoic geological evolution and geodynamic setting.