内蒙古甲乌拉矿区节理发育分布规律与成矿关系的研究

Study on the relationship between the development and distribution of joints and mineralization in JIAWULA mining area,Inner Mongolia

甲乌拉矿是以铅锌银为主生产多年的老矿区,随着开采年限的延长,矿区320以上资源储量逐年减少,严重制约生产任务的完成。矿区在多年的生产过程中积累了大量的地质资料,前人也对矿区做了不少研究工作,也明确指出矿体呈脉状产于北西西、北西、北北西向断裂构造带中,但对节理方面的研究资料相对较少,尤其在节理分期、配套、构造应力分析等方面研究更少。本文通过对甲乌拉矿区野外考察和室内研究的综合分析,地层岩性的认识、构造背景的考察、岩石薄片的分析、200m中段节理产状的分析和整理、绘制节理玫瑰花图对节理进行分期、配套、应力分析等恢复矿区古应力场,在宏观构造的基础上进一步认识微观节理与矿体的形成、赋存等关系的研究,从而对矿区下一步地质找探矿方面提出一定的参考意见和措施。

Jiawula mine is an old mining area which mainly produces lead zinc and silver for many years.With the extension of mining years,the reserves of resources above 320 in the mining area decrease year by year,which seriously restricts the completion of production tasks.A large amount of geological data has been accumulated in the production process of the mining area for many years.The predecessors have done a lot of research work on the mining area,and also clearly pointed out that the ore body occurs in the nw,nw,nnw trending fault structural belt,but the research data on joints is relatively small,especially in joint stages,matching,structural stress analysis and so on.In this paper,through the comprehensive analysis of field investigation and indoor research in Jiawula mining area,the understanding of formation lithology,the investigation of structural background,the analysis of rock thin section,the analysis and arrangement of joint occurrence in the middle 200m,the drawing of joint rose diagram,the stage,matching and stress analysis of joints,the ancient stress field in the mining area is restored,and the micro joints and the ore are further recognized on the basis of the macro structure Based on the study of the relationship between the formation and occurrence of the ore body,some suggestions and measures are put forward for the next geological prospecting in the mining area.