辽东青城子白云金矿床成矿期构造特征分析  

Analysis of Structural Characteristics of Mineralization Period in Qingchengzi Baiyun Gold Deposit in Eastern Liaoning

作　　者：于婳 赵国春[1] 刘建民[2,3] 张家齐 毕广源 郭祺 房兴 徐刚 刘福兴[4] 霍延达 边惠惠 Yu Hua;Zhao Guochun;Liu Jianmin;Zhang Jiaqi;Bi Guangyuan;Guo Qi;Fang Xing;Xu Gang;Liu Fuxing;Huo Yanda;Bian Huihui(School of Earth Sciences and Resources,China University of Geosciences,Beijing100083,China;Laboratory of Dynamic Diagenesic and Metallogenesis Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing100081,China;Key Laboratory of Paleomagnetism and Tectonic Reconstruction,Ministry of Natural Resources,Beijing100081,China;103 Brigade of Non-Ferrous Geological Bureau of Liaoning Province,Dandong118008,Liaoning,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质科学院地质力学研究所动力成岩成矿实验室,北京100081 [3]自然资源部古地磁与古构造重建重点实验室,北京100081 [4]辽宁省有色地质局一○三队,辽宁丹东118008

出　　处：《吉林大学学报（地球科学版）》2021年第6期1720-1739,共20页Journal of Jilin University：Earth Science Edition

基　　金：国家深地资源勘查开采专项(2016YFC0600108)。

摘　　要：辽东青城子金矿集区位于华北克拉通北缘东段古元古代辽吉裂谷带内,是我国重要的金富集区之一。白云金矿床是青城子金矿集区中具有代表性的矿床,其储量大、开采浅,具有较大的找矿潜力。通过野外勘察、井下观察、资料收集及室内测试等方法,并采用野外情况与室内分析相结合、宏观与微观相结合的研究方法,对矿体的分布形态、围岩蚀变及成矿期的构造特征进行了研究。研究表明:该矿床主要发育于辽河群盖县组云母片岩、变粒岩中,为热液蚀变岩型金矿床,矿体主要受断裂构造控制,主体走向为EW向,向南中等—低角度倾斜,呈舒缓波状,具有尖灭再现等特点;矿体围岩蚀变发育并受断裂控制,主要为硅化、绢英岩化、石墨化、绿泥石化等;导矿和容矿构造主要为近EW向逆冲断裂及其派生的次级构造。通过对成矿期控矿断裂解析及Au品位分布特征,厘定其成矿期构造应力场为NW—SE方向挤压,矿体向SW侧伏。The Qingchengzi gold ore concentrated area is located in the Paleoproterozoic Liao-Ji rift zone in the eastern section of the northern margin of the North China craton, it is one of the important gold-rich areas in China, and the Baiyun gold deposit is a representative of the Qingchengzi gold ore concentrated area. The mineral area has large reserves and shallow mining with great prospecting potential. Through methods such as field survey, underground observation, data collection and indoor testing, and the combination of field conditions and indoor analysis, and the combination of macro and micro research methods, the distribution of ore bodies, surrounding rock alteration and mineralization period structural characteristicsare analyzed. The studies show that the deposit is mainly developed in mica schist and metagranulite of the Gaixian Formation in the Liaohe Group. It is a hydrothermal altered rock type gold deposit. The ore body is mainly controlled by the fault structures, and their main trend is east-west and mid-low angle to south, in gentle waves, or long lotus root joints, with the characteristics of reappearance of sharp extinction. The surrounding rocks of ore bodies are altered mainly through silicification, sericinization, graphitization, and chloritization, which are controlled by faults. The ore-conducting and ore-hosting structures are mainly near east-west thrust faults and their derived secondary structures. Through the analysis of the ore-controlling faults in the mineralization period and the distribution of Au grade, it is believed that the tectonic stress field in the mineralization period squeezed in the direction of NW-SE, so the ore bodies are lateral to SW.

关 键 词：白云金矿床 构造特征 矿体形态 围岩蚀变 热液蚀变岩型金矿床 

分 类 号：P613[天文地球—矿床学] P618.51[天文地球—地质学]