内蒙古额济纳旗疙瘩井金矿区构造-蚀变-地球化学综合方法找矿研究  

Integrated Structure-Alteration-Geochemistry Prospecting of the Gedajing Gold Mining Area in Ejin Banner, Inner Mongolia

作　　者：张善明[1,2] 贺中银 胡二红 王亚楠 范立新 郝海江 ZHANG Shanming;HE Zhongyin;HU Erhong;WANG Yanan;FAN Lixin;HAO Haijiang(School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China;The Eighth Branch of Inner Mongolia Bureau of Geology and Mineral Resources Exploration&Development,Wuhai 016000,Inner Mongolia,China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,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]内蒙古自治区第八地质矿产勘查开发院,内蒙古乌海016000 [3]中国地质大学(武汉)资源学院,湖北武汉430074

出　　处：《大地构造与成矿学》2018年第2期266-278,共13页Geotectonica et Metallogenia

基　　金：内蒙古自治区国土资源厅项目(NMKD2014-10)资助

摘　　要：北山中南带分布着众多受韧-脆性构造蚀变带控制的金矿床(点),此类矿化的显著特征是石英微细脉或构造蚀变岩含矿且富,而围岩几乎不含矿,短距离内金品位变化剧烈,传统方法很难发现微矿化线索。运用成矿构造学分析、构造蚀变带填图和构造地球化学测量对产于北山中南带东段的疙瘩井金矿区进行了综合方法找矿研究,取得以下认识:全区可划分为4个构造蚀变分区,北西西向主干断层上盘为有利控矿构造,其韧-脆性构造带内的构造突变或应力转换位置是矿体潜在地段。绢云母化、钠长石化是一种特征的蚀变找矿标志。构造地球化学测量显示,Au是该区最主要的成矿元素,各元素异常空间分布与划分的4个构造蚀变分区配套,其中成矿元素异常呈北西向带状分布在北西西向主干断层上盘-成矿热液蚀变带。成矿构造分析着眼于矿区构造格架和控矿构造,构造蚀变分析着眼于地质过程中矿物岩石发生的变化及找矿标志,构造地球化学分析着眼于地质过程中流体化学成分的变化和找矿对象,三者互为补充、相互印证,是成矿时间-物理-化学空间的直观反映。根据本次工作,认为在北山地区通过构造-蚀变-地球化学综合方法寻找金微矿化线索是行之有效的。The brittle ductile tectonic alteration belt in the central south zone of the Beishan area hosts many gold deposits and occurrences.The most significant feature of this type of Au mineralization is that the high grade ores are hosted in the quartz micro-veins and/or altered rocks,while the fresh wall rocks are mostly barren.The commonly abrupt changes in ore grade make it difficult to trace the ore mineralization using traditional prospecting methods.Based on the metallogenic structure analysis,structural alteration mapping and tectonic geochemistry survey,the authors proposed that the structure-alteration-geochemistry comprehensive prospecting method can be an effective approach in the Gedajing gold mine area that is situated in the east section of the central south zone in the Beishan area.It is concluded that the gold mining area can be divided into four tectonic-alteration areas.Among them,the hanging wall of the NNW direction main fault is the main ore-control structure,where the potential ore-bodies are located in the structural mutation or stress transformation among the brittle ductile tectonic zone.Sericitization and albitization are the most valuable prospecting indicators.Tectonic geochemical survey shows that Au is the main ore-forming element in this area.Distribution of ore metal anomalies is consistent with the division of the four tectonic areas,and the anomalies of ore-forming elements distribute mainly in the hanging wall of the NNW direction main fault.Integrated investigation of metallotectonics,structural alteration zone,and tectonic geochemistry has been proved to be efficient prospecting method in tracing trivial mineralization clues in the Beishan area.

关 键 词：成矿构造学 构造蚀变带填图 构造地球化学 金 微矿化 

分 类 号：P612[天文地球—矿床学]