辽宁省锰元素分布规律及锰矿床潜力评价

DISTRIBUTION LAW OF MANGANESE AND POTENTIAL EVALUATION OF MANGANESE DEPOSITS IN LIAONING PROVINCE

通过研究不同地质构造单元、不同时代地层和不同岩石类型中锰元素分布特征,认为辽西台陷和松辽拗陷区可作为形成锰矿的重要矿源地体.结合辽宁省富锰地层特征和锰矿床地质特征,认为铁岭组含锰灰岩岩层是沉积锰矿找矿的重要标志,其分布的辽西地区可划为辽宁省境内大型浅海沉积锰矿成矿远景区;辽东、辽南白垩系富锰页岩分布的地区有望找到中到大型河湖相沉积锰矿床;火山热液锰矿可在朝阳、锦西以西地区寻找,其矿源层为串岭沟组石英砂岩,高于庄组含锰细砂岩,大红峪组、铁岭组、洪水庄组富锰碳酸盐岩,成矿热液为酸性岩浆提供.

With study on the distribution characteristics of manganese in different geological tectonic units,strata of different times and different rock types,it is considered that the Western Liaoning platform-depression and Songliao depression could be important source for manganese ore.Combined with the characteristics of manganese-rich strata and geological features of manganese deposit in Liaoning Province,the study shows that the manganiferous limestone of Tieling Formation can be regarded as the significant indicator for sedimentary manganese deposit.Western Liaoning can be classified as a large shallow sea sedimentary manganese metallogenic prospect area.In eastern and southern Liaoning,where Cretaceous Mn-rich shale is distributed,it is expected to find medium-large lacustrine facies sedimentary manganese deposits.Volcanic hydrothermal manganese deposits can be prospected on the west of Chaoyang and Jinxi area.Their source beds are the quartz sandstone of Chuanlinggou Formation,Mn-bearing fine sandstone of Gaoyuzhuang Formation and Mn-rich carbonate rocks of Dahongyu,Tieling and Hongshuizhuang formations.The ore-forming fluid is supplied by acidic magma.