四川观音梁子锰矿床地质特征及找矿意义  

Geological characteristics of Guanyinliangzi manganese deposit in Sichuan and significance of its prospecting

作　　者：郑辉[1] 

机构地区：[1]四川省冶金地质勘查局六〇六大队,成都611730

出　　处：《地质找矿论丛》2016年第3期317-324,共8页Contributions to Geology and Mineral Resources Research

摘　　要：观音梁子锰矿赋存于寒武系邱家河组中,是龙门山中段在邱家河组中新发现的工业锰矿床。通过矿区勘探工作及室内观察、测试等手段,对矿区成矿地质背景、含锰岩系、矿体及矿石矿物特征、矿床成因、找矿前景等方面进行了初步总结分析。研究发现,观音梁子锰矿为典型的沉积型锰矿床,矿体呈层状产于邱家河组三段硅质白云岩中,延伸较稳定,严格受层位的控制;矿石类型为菱锰矿型,主要由菱锰矿、硫锰矿、水锰矿等组成。早寒武世,龙门山地区由于地壳拉张裂陷形成深海盆地,在还原环境下,锰元素与碳酸根直接结合形成碳酸锰矿物,稳定的物源、深海还原环境为锰矿富集提供了有利的成矿环境。观音梁子锰矿的发现,证实了龙门山北段邱家河组含锰层位的存在,为龙门山中段的锰矿找矿提供了契机,同时显示了寒武系邱家河组具有良好的找锰远景。The Guanyinliangzi manganese deposit located in the Cambrian Oiujiahe Formation is a newly discovered industrial deposit in the middle Longmenshan area. Based on geological exploration, laboratory analysis and tests the authors studied the geological background, ore-bearing horizon, ore body and ore mineral characteristics, genesis and prospecting potential of the deposit and summarized that the deposit is a typical sedimentary manganese deposit with ore bodies occurring in layers of siliceous dolomite of Qiujia- he Formation and they are stable in extension, controlled strictly by horizon and is dominated by rhodo- chrosite ore consisting of rhodochrosite, alabandite and manganite. In the Early Cambrian, a deep sea ba- sin was formed in the Longmenshan area due to the tension of the crust with reducing environment under which manganese compounded directly with carbonic acid root into carbonate manganese ore. The stable source supply and deep-sea reducing environment is a locus of manganese ores. The discovery of Guanyin- liangzi deposit proves that a manganese ore horizon occur in the north Longmenshan area and provides a new opportunity for manganese ore prospecting in the middle Longmenshan area and shows good ore pros- pects in the Cambrian Qiujiahe Formation.

关 键 词：观音梁子锰矿 寒武系邱家河组 沉积型碳酸锰矿 找矿潜力 四川省 

分 类 号：P613[天文地球—矿床学] P618.32[天文地球—地质学]