| Nanjiang Pinghe Graphite Mine is located in the Nan-Wang Graphite Metallo-genic Belt,and it are superior that the metallogenic geological conditions.In this paper,through field geological survey and indoor analysis and testing,combined with the study of regional structural evolution history,the geological and geochemical characteristics of the deposit are comprehensively analyzed,the original rock type of metamorphic rock in the mining area is restored,the genesis of the deposit is discussed,the metallogenic model is established,and preliminary The occurrence state of vanadium in graphite ore is analyzed,which provides basic geological data and theoretical basis for the later exploration and development of the graphite ore and beneficiation process research.?1?Graphite ore bodies are deposited in the Mewo subgroup of Huodiya Group in the Mes oproterozoic,and are mainly produced in layers,quasi-layers and lenses.The mineral composition includes graphite,quartz,muscovite,sericite and pyrite,etc.The ore structure is mainly scaly granular recrystallized structure and variable residual sand-like structure,and the structure is mainly lamellar structure and strip structure.The graphite type is mainly medium-coarse crystalline large flake graphite.?2?The content of V2O5 associated with graphite ore ranges from 0.24%to 1.54%,with an average of 0.74%?>0.5%?.According to the identification of graphite samples by light sheet microscopy,XRD pattern analysis,valence state analysis of vanadium,element correlation analysis and chemical phase and scanning electron microscopy analysis,it is believed that the vanadium in Pinghe graphite mine is similar to V3+and V4+.The form replaces aluminum into the pores of aluminum-oxygen octahedron of the muscovite crystal structure.Pinghe graphite mine belongs to the typical mica-type vanadium-bearing graphite mine.?3?Based on the structure,structure,mineral composition and chemical composition characteristics of the Pinghe graphite mine ore,combined with the related discrimination diagram of the metamorphic rock original rock recovery in the mining area,it is considered that the original rock is a set of carbonate rock with a small amount of muddy sandstone and basic The rock assemblage has obvious sedimentary-characteristics of clay semi-clay-carbonate.The sedimentary age is the Precambrian,and the source is from the craton highland or the passive continental margin.?4?Through the graphic analysis of tectonic environment discrimination and the discussion of paleo-sedimentary environment,it is considered that the tectonic environment of Pinghe graphite mine is a passive continental marginal environment,and the paleo-deposited environment is an oxygen-deficient and low-energy lagoon environment under dry climate conditions.?5?Through the test and analysis of the C isotope of the ore,it is believed that the carbonaceous material of the Pinghe graphite deposit is mainly derived from organic carbon deposits.Combining the study of metallogenic geological conditions and regional structural evolution history,the Pinghe graphite deposit belongs to the sedimentary metamorphic graphite deposit. |
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