| Northeast Guizhou Songtao area of Tongren city is one of the most concentrated region of China's manganese ore distribution,manganese ore resources reserves of 1*109t,accounting for the total reserves of 1/10 manganese ore.Manganese deposits are mainly distributed in Songtao County MengXi-LengShuixi-WuLuo area,mainly belong to sedimentary manganese deposits.Based on the summary of previous research results,this paper through the work of Songtao area in northeastern Guizhou Tongren city nanhuaan system Datangpo formation at the lower part of the manganese bearing rock series of systematic field survey,profile measurement and typical manganese deposit anatomy and indoor comprehensive study,and the sedimentary facies analysis and geochemical analysis and electron probe microanalysis,the manganese bearing rock series system there sedimentary characteristics and ore genesis,mainly has the following several new ideas and new achievements:.Firstly,Northeast Guizhou Songtao manganese accumulation in the sedimentary basin,South East of MengXi LongTou mountain to XuJihe area and North West of Shiliang LiangFengao-WuLuo LiJiawan-LengShuixi YangJiawan area bay sedimentary sequence has the obvious difference.The main difference with mine area and non ore area is thick or the manganese bearing rock series of lower wire group in the Ao pure quartz sandstone,pure quartz sandstone and rock in the development of large-scale cross bedding,and the sedimentary environment for the shallow water and water power strong,unfavorable to the deposition of manganese ore.In addition,the manganese bearing rock series,containing lots of ore well with carbonate rock interlayer or lens more,and see a tuff and tuffaceous clay rock with the distribution of ore poor parts of tuff and tuffaceous rocks that produce more clay,and volcano activities closely with manganese ore contact.Secondly,Show the anatomy of typical manganese ore,manganese ore deposits in this area,the main structure of a mud crystal structure,sand structure,cataclastic structure;the main structure has the massive structure,the banded structure and oolitic spherical structure etc..The main minerals are siderite and calcium siderite,the main gangue minerals are manganese dolomite,manganese calcite,pyrite,quartz and so on.Thirdly,Study on mineralogy and mineral chemistry showed that strawberry often contain manganese ore in pyrite,reveal the sedimentary environment during the formation of a manganese reduction condition;through the study of manganese mineral Mn/Fe ratios indicated that manganese minerals in manganese ore deposit belongs to the diagenetic types.In addition,some manganese ore often contains volcano debris,and MnO2+FeO and CoO+NiO were negatively correlated to poor,significantly different from ocean manganese nodule positive correlation showed that most of the manganese ore deposit Mn,Fe is a non aqueous origin,may be terrestrial,volcano and hydrothermal genesis.Forthly,The characteristics of major elements analysis results show that the formation of research area of rock is closely related with hot water and biological activities;regional tectonic activity metallogenic environment in the study area of manganese ore in continental margin;source of ore-forming materials from nature.Fifthly,The characteristics of trace elements analysis results show that manganese ore?Cu+Co+Ni?characteristics of Fe-Mn-*10 and Y/Ho,Nb/Ta ore discrimination diagrams and U/Th ratio indicates the study area with hot water deposition;V/?V+Ni?forming environment belongs to shallow water,reducing environment dry and the ratio of Sr/Ba indicates that the study area of manganese ore the bed;according to La-Th-Sc and Th-Sc-Zr/10 tectonicdiscrimination diagrams,the study area belongs to the passive continental margin,indicating the material sources of this area manganese in the environment of passive continental marginSixly,REE analysis results show that the heavy rare earth elements of rocks and ores and light rare earth elements differentiation is obvious,the overall display characteristics of HREE relative loss and relative enrichment in LREE,Eu and Ce with weak positive anomalies,Ce values indicating the research area in the continental margin tectonic environment;and La/Yb REE and La/Yb-Ce/La discrimination diagrams show that the formation process of the rock ore by mixed effects of hot water deposition and normal seawater deposition.The results show that the ore-forming materials are mainly derived from the volcanic arc,and the volcanism is related to the formation of manganese ore. |
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