贵州从江高增新元古代大塘坡组锰矿沉积地球化学特征  

Sedimentary Geochemistry of Manganese Deposit of the Neoproterozoic Datangpo Formation in Guizhou Province,China

作　　者：杨瑞东[1] 高军波[1] 程玛莉[1] 魏怀瑞[1] 许利群[1] 文雪峰[1] 魏晓[1] 

机构地区：[1]贵州大学,贵阳550004

出　　处：《地质学报》2010年第12期1781-1790,共10页Acta Geologica Sinica

基　　金：贵州大学矿床学博士点基金项目资助的成果

摘　　要：贵州新元古代大塘坡期是重要的成锰时期,在贵州东部、湖南西部形成了一系列锰矿床。近年来在贵州东南部从江发现的大塘坡期锰矿,表明大塘坡期成锰范围更广,成锰环境更为复杂。通过对从江高增新元古代大塘坡组锰矿的沉积特征、矿物学和沉积地球化学特征的研究,含锰岩系具有热液(水)沉积、富集Cu、Zn、Ni、Nb、Co、Mo、As、Sb、Sr、Ba、V、Ga、Ag、Th、U等特征,特别是Pb、Co、W均显著富集,显示热液沉积特征。含锰岩系中黑色块状锰矿、深灰色纹层状锰矿和灰白色纹层状含锰凝灰岩在U-Th相关图、Cr-Zr相关图、Co/Zn-(Co+Ni+Cu)相关图上均显示具有热液(水)沉积特征,稀土配分曲线类似碧口群海底火山喷流沉积。含锰岩系为由凝灰岩、硅质岩、碳酸锰互层和黑色碳质泥岩沉积组合,其岩石组合与海底火山喷流沉积类似。因此,认为从江高增锰矿属于海底热液(水)喷流沉积产物,该地区锰矿找矿应该沿同生深大断裂进行。The Datangpo Stage of the Neoproterozoic was an important period for manganese mineralization and this can be proved by a number of manganese deposits found in eastern Guizhou Province and western Hunan Province,China.Recent discovery of manganese deposits in Gaozeng,Congjiang County,southeastern Guizhou indicates that extensive manganese mineralization may occur in the Datangpo Stage and mineralization settings were even much complicated.Research of sedimentary features,mineral assemblage and geochemistry of the manganese deposits of the Datangpo Formation shows the enrichment of Cu,Zn,Ni,Nb,Co,Mo,As,Sb,Sr,Ba,V,Ga,Ag,Th,and U,especially Pb,Co and W,strongly suggesting that Mn-bearing rock series is hydrothermal sedimentation in origin.The diagrams of U-Th,Cr-Zr,and Co/Zn-（Co＋Ni＋Cu）in black massive manganese ore,laminated manganese ore,and white Mn-bearing tuff also present the features of hydrothermal sedimentation;and the REE distribution patterns of them are similar to those of submarine exhalative sedimentation of the Bikou Group.The Mnbearing rock series consists of tuff,siliceous rock,intercalated manganous carbonate,and black carbonaceous shale,and this assemblage of rocks is similar to those of submarine exhalative sedimentation. Therefore,it is believed that the Gaozeng manganese deposit might be the product of submarine hydrothermal exhalative sedimentation and exploration for the manganese deposits in this area should target synchronous deep-seated faults.

关 键 词：热水(液)沉积 锰矿 新元古代 贵州 

分 类 号：P618.32[天文地球—矿床学]