| Under the support of the instructor's projects,the authors study the relatively weak ore facies of Zhaxikang lead-zinc polymetallic deposit in previous,Through cutting polished sections and performing microscopic identifications supplemented by electronic probe test means to 120 representative ore or mineralized rocks collected in the field,at the same time,a special study has been carried out on sphalerite widely distributed in the main mineral,get the following progress:1.Basically found out the ore composition,structure and material composition:a total of 10 species were identified,such as massive,disseminated,brecciated,veined;sulfide,sulfur salts minerals,carbonate minerals and other 40 kinds of metal minerals;among them,seven newers have been identified;The ore structure has crystal structure,solid solution separation structure,metasomatic structure,recrystallization structure,pressure action structure 5 categories,16 subclasses,the new sub-structure of the image-like solid solution structure and the intergenerational lattice structure are identified.2.The basic identification of the mining area of the mineral were associated with:There are 78 species of natural associated mineral assemblages,a single kind of metal minerals can be associated with 15 to 29 kinds of minerals.Sphalerite has 69 species of natural combination,with 26 kinds of metal minerals were associated with;Arsenic-bearing pyrite has 69 species of natural combination,which can be associated with 29 kinds of metal minerals;Galena has 31 kinds of natural combination,with 20 kinds of metal minerals were associated with;There are 39 kinds of natural combined with arsenic arsenic lead,which can be associated with 20 kinds of metal minerals.3.Described the pyrite,galena and other eight kinds of metal mineral standard characteristics,combined with the structural standard,light standard,chemical composition characteristics,reflecting the ore-forming fluid had less than 200 ?,200~ 300 ?,300 ~ 400 ?,350 ~ 550 ? 4 more stable temperature state.And sphalerite,pyrite,galena and other minerals carried out by electronic probe analysis,combined with ore structure characteristics,metallogenic stage,metallogenic stage,metallogenic period for the hydrothermal period and epigenetic stage,be divided,in the hydrothermal period generally shows at least seven stages.4.Sphalerite found in the 78 polished sections,accounting for up to 65%,among120 pieces of sample,producing up to 9 species,naturally associated with a total of 69 species,3 kinds of internal reflection type,corresponding the Zn/Fe values for thesphalerite with different internal reflections,finding that the weaker the internal reflection,the higher the Fe content,and the higher the FeS value,the higher the formation temperature,the FeS value of about 60% of the sphalerite in the mining area is greater than 7.74,forming a temperature greater than 300 ?,for the high temperature deposits,the distribution of sphalerite at different temperatures in boreholes and tunnels reveals that the ore deposits are decreasing from east to west and from bottom to top.And high temperature sphalerite fell more than 4490 ~ 4550 m rang.In summary,the mining area of complex polymetallic mineralization,mineralization has a multi-stage,the mineralization process is complex,that the deposit for the high temperature multi-stage hydrothermal filling account formation. |
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