Texture and Structure of Ore and Genesis of the Alaskite-type Uranium Deposit in the Gaudeanmus Area,Namibia

Based on field observations,microscope,X-ray diffraction,QEMSCAN and electron microprobe techniques,this paper studies in detail the mineral composition,texture and structure of uranium ore of the alaskitetype uranium deposit in the Gaudeanmus area,Namibia.Uranium minerals of this area are mainly uranium oxides,U-Ti-oxides and uranium silicates,in which,uranium oxides include uraninite,pitchblende and thor-uraninite;UTi-oxides include brannerite,betafite,uranpyrochlore and euxenite;uranium silicates include uranophane,coffinite and uranothorite.Uraninite,thor-uraninite and U-Ti-oxides are mostly panidiomorphic or hypidiomorphic granular texture,disseminated structure,and most of pitchblende and uranium silicates are aphanocrystalline texture,metasomatic relict texture and veined structure.Thus,the alaskite-type uranium deposit of this area was formed together by the original magma crystallization differentiation,later hydrothermal reformation and supergenesis.