黔东地区松桃大屋大型锰矿床地质特征研究

Study on Geological Characteristics of Songtao Dayu Large Manganese Deposit in Eastern Guizhou

黔东地区位于扬子陆块与华南陆块的过渡区,区内南华系大塘坡组一段碳质页岩中发育一系列中—超大型菱锰矿床,俗称“大塘坡式”锰矿。松桃大屋大型锰矿床作为南华纪“大塘坡式”锰矿的重要组成部分,从二十世纪七十年代发现至今工作仍停留在普查、详查阶段,研究程度低,本文通过对大屋锰矿床地质特征研究,认为黔东地区松桃大屋锰矿区锰矿体由下至上均表现出纹层(条带)状锰矿至破碎状锰矿变化为特征,锰矿石构造主要呈纹层(条带)状、结构以泥晶(微晶)结构为主。纹层(条带)状锰矿成矿似乎与微生物细菌关系密切,破碎状锰矿明显受热液作用影响,锰矿成矿物质来源推测可能主要与深部有关。

The Eastern Guizhou region is located in the transition zone between the Yangtze Continent and the South China Continent. A series of medium-to-ultra-large rhodochrosite deposits are developed in the carbonaceous shale of the first member of the Datangpo Formation of the Nanhua System, commonly known as "Datangpo-type" manganese deposits. The Songtao Dawu large manganese deposit is an important part of the "Datangpo type" manganese deposit in the Nanhua period. Since its discovery in the 1970s, the work is still in the stage of census and detailed investigation, and the research level is low. According to the study of geological characteristics, it is believed that the manganese ore bodies in Songtao Dayu manganese ore area in eastern Guizhou show the characteristics of laminar(strip) manganese ore to broken manganese ore from bottom to top. The structure of manganese ore is mainly laminar(strip), the structure is dominated by micrite(microcrystalline)structure. Laminated(striped) manganese ore mineralization seems to be closely related to microbial bacteria,broken manganese ore is obviously affected by hydrothermal action, and the source of manganese ore-forming minerals is speculated to be mainly related to the deep.