Mineralogical Characteristics And Genetic Significance Of The 505 Uranium Deposit In Panzhihua

The panxi area is located in the western margin of the yangzi platform,and the axis of kangdian is traversed.It is found that there are various types of uranium mineralization,which is one of the rare concentration areas of uranium mineralization on the axis of kangdian.The 505 uranium deposit of panzhihua is the core area of the study,and it is found that there is a special rich crystal uranium deposit,and the mineralization characteristics are more unique.Predecessors in 505 uranium deposit mineralogy research is relatively weak,on the basis of predecessors' work on the 505 uranium deposit regional geological characteristics,ore deposit geological feature analysis,summary,and emphatically on the uranium ore,the ore deposit containing uranium ore and other mineral symbiosis of microscopic observation,scanning electron microscopy(sem)and electron probe analysis,has carried on the preliminary summary to its mineralogical characteristics,get the following:(1)the strata rock in dada 505 area can be divided into the base(mixed original rock,metamorphic rock type),mixed rock metamorphic rock,mixed rock and vein body according to the degree of mixed diagenesis.In addition,there are later quartz veins,tectonic alteration rocks,diabase and diophane.(2)the uranium mineralization types are complex in dada 505 area,and there are various types of rocks and alteration types.According to the lithologic characteristics of the ore,the uranium ore field 505 region is divided into five types: altered rock type ores,silicide plagioclase gneiss mineral,silicide felsic vein ore,altered Angle flash inclined long pyroxenite and mixed rock type ore,etc.(3)uranium mineral deposits of 505 uranium deposit and uranium mineralization mainly include crystalline uranium ore,thorium-rich uranium deposit,titanium uranium ore,uranite,thorium and an unknown containing uranium containing silicon,lead and titanium.High temperature to form the primary uranium ore often contains a certain amount of Th and rare earth elements,uranium and the complexity of the titanium oxide minerals formed in high temperature conditions,titanium,uranium,thorium crystalline uranium and thorium mineral sphene and high temperature,indicate that the early formation of native uranium metallogenic environment for high temperature environment,zoisite,epidote,explains the metamorphisms thermal alteration of the migmatite,pyrite,magnetic pyrite and chalcopyrite and other sulfide(liquid(medium to low temperature alteration mineral assemblage)may be formed in the late.Enrichment of uranium ore stone has two kinds of forms,a stone in vein uranium exists in mineral fissure,another stone around the early formation of the crystalline uranium,uranium and low-temperature minerals such as pyrite,surrounding rock uranium,are distributed in three concentric rings.Late formation of uranium mineral filling in pyrite and other low temperature mineral assemblage of the crack,and the early formation of the uranium,surrounded by crystal uranium deposit,were formed by the reduction of the late hydrothermal surrounded by pyrite.All these characteristics indicate that uranium deposit and uranium mineralization in 505 uranium deposit have multiple periods.(4)uranium is closely related to titanium in daetian area,and the mineral titanium content is high in total,and is mainly dominated by crystalline uranium.If the associated mineral is mainly phosphorous,it is mainly uranium containing thorium,or even thorium containing uranium.The above rules further explain the symbiosis of the crystalline uranium ore mainly with rutile and titanium uranium,while thorium is mainly formed in apatite aggregate or colloidal apatite.The reasons for this are related to the geochemical characteristics of uranium and thorium,which are more likely to be pro-titanium in magma evolution or in fluids related to magma evolution,while thorium is more pro-phosphorus.