贵州织金茅坪磷矿床地质特征及成因分析OA

The Maoping phosphate deposit in Zhijin,Guizhou is a super-large phosphate deposit,concealed in the phosphorus-bearing strata of the Gezhongwu Formation at the bottom of the Meishucunian Stage.Based on the previous research results and the exploration achievements of this project,the geological characteristics and genesis of the phosphate deposit in the study area are comprehensively analyzed to provide references for the later development of the mine and the search for concealed sedimentary phosphate deposits in the surrounding areas.The vertical stratigraphic sequence of the phosphate bearing rock series was established using core logging method combined with rock mineral identification results,and its sedimentary environment was analyzed;Using systematic sampling and testing analysis,useful and harmful components of phosphate rock ore were obtained,and the correlation between each component was analyzed using statistical analysis based on the results.The research results show that the phosphate ore bodies are layered or sub-layered,with occasional 1～2 intercalated layers of gangue.The ore bodies have good integrity and continuity,stable thickness,and uniform useful components.The natural types of ore are mainly banded and striped phosphorite ore;the industrial types are mainly carbonate phosphorite ore;and the ore grade is Grade III.The phosphate deposits in the study area are distributed in the platform biotopes(reefs),mainly formed by tidal sedimentation,and after being subjected to the combined effects of waves,storms,etc.,they undergo sedimentation-churning-sieving-enrichment-retransportation,and are re-deposited as phosphorite ore bodies after being sieved by seawater under the action of chemical and bio-chemical processes.