内蒙古赤峰地区山湾子金矿床地质特征及成矿时代  

Geological characteristics and metallogenic epoch of Shanwanzi Gold Deposit in Chifeng,Inner Mongolia

作　　者：李伟[1] 吴桐[1] 刘淼[1] 陈井胜[1] 李斌[1] 杨帆[1] 刘世峰 Li Wei;Wu Tong;Liu Miao;Chen Jingsheng;Li Bin;Yang Fan;Liu Shifeng(Shenyang Center of China Geology Survey;School of Mining Industry,Liaoning Technical University)

机构地区：[1]中国地质调查局沈阳地质调查中心 [2]辽宁工程技术大学矿业学院

出　　处：《黄金》2018年第4期15-17,共3页Gold

基　　金：中国地质调查局项目(DD20160048-04)

摘　　要：山湾子金矿床位于赤峰金银多金属成矿带南部,对该矿床地质特征的分析表明:赋矿围岩为白垩系义县组一段安山岩,北东向断裂为主要控矿构造,控制了蚀变带的展布方向,围岩蚀变具有明显的分带性。锆石LA-ICP-MS U-Pb测年获得的安山岩形成年龄为123.6 Ma和124.4 Ma,与赤峰—朝阳金成矿带中金矿床的形成时代一致,为早白垩世。成矿时代的厘定对深入研究该矿床的成因及指导找矿具有指示意义。The Shanwanzi Gold Deposit is located in the south of Chifeng gold and silver polymetallic metallogenic belt.The analysis of the deposit geological characteristics shows that the host surrounding rock is the Cretaceous ande-site from of Yixian Formation;NE fault is the main ore-controlling structure and controls the distribution direction of the alteration zone;the alteration of surrounding rocks has obvious zonation.The zircon LA-ICP-MS U-Pb dating of andesite determined the metallogenic epoch to be 123.6 Ma and 124.4 Ma,the same with that of the gold deposits in Chifeng-Chaoyang gold metallogenic belt,which indicates the formation to be in Early Cretaceous.The age has guiding significance for metallogenesis study and prospecting of the deposit.

关 键 词：地质特征 成矿时代 围岩蚀变 义县组 山湾子金矿床 内蒙古赤峰地区 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]