贵州松桃道坨锰矿含锰岩系地球化学特征和沉积环境分析  

The Geochemical Characteristics and Sedimentary Environment of Manganese-bearing Rock Series of Daotuo Manganese Deposit,Songtao County of Guizhou Province

作　　者：何志威[1,2] 杨瑞东[2] 高军波[2] 程伟[2] 刘帅[2] 张峰玮[2] 

机构地区：[1]贵阳矿业开发投资股份有限公司,贵阳550001 [2]贵州大学资源与环境工程学院,贵阳550025

出　　处：《地质论评》2014年第5期1061-1075,共15页Geological Review

基　　金：贵州大学研究生创新基金(编号研理工2013058);教育部博士点基金(编号20105201110002);贵州省省长基金(编号2009179);贵州大学博士点学科建设基金合作资助的成果

摘　　要：道坨锰矿床是贵州锰矿整装勘查过程中新发现的全隐伏超大型锰矿床,其含锰岩系赋存于南华系大塘坡组第一段底部黑色页岩中,呈层状、似层状、透镜状产出。对含锰岩系主量及微量元素地球化学特征分析:其V/(V+Ni)、V/(V+Cr)、V/Cr、Ce/La值,及U、V、Ni、Mo等氧化还原敏感元素的富集程度显示其形成于缺氧环境。含锰岩系富集As、Mo、Ag、Sb,及Al/(Al+Fe+Mn)、(Fe+Mn)/Ti、Co/Zn值均显示热水沉积物特征,且在(Cu+Ni+Co)×10—Fe—Mn、Co/Zn—(Cu+Ni+Co)关系图解中,岩矿样品投影点均落在热水沉积区内,反映了热水作用对锰的富集和成矿影响甚重。此外,Al2O3/(Al2O3+Fe2O3)、Al/(Al+Fe)、Al/(A1+Fe+Mn)、(La/Ce)N值及(K2O+NaO2)—SiO2、La/Ce—Al2O3/(Al2O3+Fe2O3)图解指示含锰岩系形成于被动大陆边缘背景。The Daotuo manganese deposit is an all-buried large manganese deposit that had been newly discovered during the integrated exploration in Guizhou.The manganese-bearing rock series characterized by layered,stratoid or lenticular structure occured in the ＂black shale＂ at the bottom of the First Member of the Datangpo Formation,Nanhua System,Neoproterozoic.In this paper,geochemical characteristics of major and trace elements of the manganese-bearing rock series were analyzed.Some geochemical parameters such as the ratios of V/（V ＋ Ni）,V/Cr and Ce/La,as well as the enrichment of redox sensitive elements（U,V,Ni and Mo） of the manganese-bearing rock series indicate that the deposit was formed a hypoxia environment.In addition,enrichment of elements like As,Mo,Ag and Sb,and the ratios of Al/（Al ＋ Fe ＋ Mn）,（Fe ＋ Mn）/Ti,Co/Zn together show typical hydrothermal sedimentary characteristics; and,the diagrams of （Cu ＋ Ni ＋ Co） 1O—Fe—Mn and Co/Zn—（Cu ＋ Ni ＋ Co） also show hydrothermal sedimentary characteristics; implying that hydrothermal activities played a vital role in the enrichment of manganese and the formation of the deposit.Furthermore,the ratios of Al2O3/（Al2O3 ＋Fe2O3）,Al/（Al ＋ Fe）,Al/（Al ＋ Fe ＋ Mn） and （La/Ce）Nand the diagrams of K2 O/Na2O—SiO2 and La/Ce—Al2 O3/（Al2 O3 ＋ Fe2 O3） all suggest that the manganese-bearing rock serious may have been formed at a passive continental margin.

关 键 词：地球化学 沉积环境 热水沉积 道坨 贵州 

分 类 号：P618.32[天文地球—矿床学]