伊犁盆地南缘郎卡地区砂岩型铀矿铀的赋存形式研究OA

In recent years,some high-grade uranium mineralization holes have been discovered in Langka area,but the occurrence forms of uranium in uranium ore was studied in detail by the predecessors.In this study,mineralogical analysis of uranium ore in this area was carried out by means of α-etching track,microscopic observation analysis,electron probe(EPMA)and scanning electron microscope(SEM).It was found that uranium in the ore mainly distributed in the form of independent uranium mineral,uranium containing mixture and adsorbed state.The independent uranium mineral is mainly distributed in the edge of quartz and feldspar detrital particles and around pyrite;uranium containing mixture is mainly distributed on the surface of TiO2 mineral particles,and adsorbed uranium is mainly distributed around kaolinite.According to the enrichment mechanism and spatial relationship,the uranium mineral assemblage were divided into 5 types,among which pyrite type and a small amount of char type uranium mineral assemblage were formed in the main mineralization stage,uranium mineral-TiO2 type was formed in the main mineralization stage slightly later than pyrite type,calcite type uranium mineral assemblage was formed in the late mineralization stage,and kaolinite adsorption type was formed in the entire mineralization stage.This study can provide basic support for the theory of uranium mineralization formation,mining and milling in this area.