贵州松桃西溪堡大型锰矿床F_1犁式断层特征及对锰矿体破坏与保存作用探讨  

Characters of F_1 Plow Fault,Destruction and Conservation to Manganese Body of Xisibao Big Manganese Deposit of Songtao in Guizhou

作　　者：袁良军[1] 周琦[2] 杜光映[3] 张平壹[1] 

机构地区：[1]贵州省地质矿产勘查开发局103地质大队,贵州铜仁554300 [2]贵州省地质矿产勘查开发局,贵州贵阳550003 [3]贵州大学资源与环境工程学院,贵州贵阳550002

出　　处：《贵州地质》2013年第3期170-176,共7页Guizhou Geology

基　　金：中国地质调查局成都地质调查中心"黔东地区大塘坡期锰矿成矿地质背景综合研究"(编号:基[2011]01-02);中国地质调查局"贵州省杉桃普贵-江口桃映锰矿评价"项目(编号:1212011120638)

摘　　要：本文以西溪堡锰矿床F1犁式正断层(冷水溪断层)为例,从分析研究F1断层所切穿的地层岩性、结构和矿物成分特征入手,探讨F1犁式正断层的特征、形成条件与成因。认为该犁式断层的形成,是由于具有超压的含锰岩系碳质页岩中的蒙脱石转变为伊利石过程中,产生的高孔隙流体压力,导致在断层通过上部脆性及其相对脆性沉积岩层进入大塘坡组第一段黑色含锰岩系(Nh1d1)这一韧性层时,迅速降低断层上覆岩层的负荷强度,使断层面倾角变缓,以致沿层面滑脱,是形成F1犁式正断层的主要原因。通过对F1断层的探讨分析研究,认为黔东及毗邻地区的"大塘坡式"锰矿区,普遍发育犁式正断层是存在的,其对锰矿体的破坏和后期保存有重要的影响。因此,开展犁式断层的特征研究,对指导黔东及毗邻地区"大塘坡式"锰矿普查找矿、开展攻深找盲,意义重大。In this paper, F1 plow normal fault of Xixibao manganese fault is taken as example, by analysis the lithology, structure and mineral material of stratum cut cross by F1 fault, the character, formation condition and genesis of F1 plow normal fault are discussed. It＇ s thought the formation of this fault is because the porosity fluid pressure product when the montmorillonite in overpressure manganese - bearing carbonaceous shale transform into illite caused the load intensity decrease of overlying strata when the fault cross the upper brittle and relative brittle sedimentary strata and enter the first black manganese - bearing series of Datangpo formation, it made the fault dip angle gentle and the stratum slippage. By analysis the F1 fault, it＇ s thought the plow normal fault developed widely in Datangpo -type manganese area in east Guizhou and the nearby area. Therefore, the character study of plow fault will be helpful for Datangpo - type manganese prospecting in east Guizhou and the nearby area.

关 键 词：F1犁式断层 断层特征 矿体保存 西溪堡锰矿床 贵州松桃 

分 类 号：P618.32[天文地球—矿床学]