| The Baiyanghe uranium-beryllium-molybdenum deposit is located in the western section of the Shemistan volcanic belt in the northwestern margin of the Junggar Basin,Xinjiang.Its unique Be-U-Mo-F element combination is rare in the world.The predecessors have made important achievements in the research of metallogenic characteristics,metallogenic regularity and metallogenesis,but the overall degree of ore mineralogy research is relatively low.Especially for a long period of time,no primary uranium minerals such as bituminous uranium ore were found,which greatly affected the profound understanding of metallogenesis.This thesis relies on the National Natural Science Foundation project "Research on the Uranium-BerylliumMolybdenum Symbiotic Differentiation Mechanism in the Baiyanghe Deposit,Xinjiang"(41272100),and selects the most representative central construction site of the deposit.Mineralogy and fine mineralogical studies of ore-forming elements are the main focus.On the basis of summarizing the geological characteristics of ore-forming,the type of ore,the structure and structure of the ore,the mineral combination of the ore,especially the main ore-forming elements U,Be,Mo and other mineralogical characteristics,preliminary discussion of the constraints of mineralogy and mineralogy on mineralization.Acquire the following main knowledge:(1)The primary uranium minerals in the ore are mainly bituminous uranium ore,a small amount of uranium ore and titanium uranium ore,and the secondary uranium minerals are mainly silicon calcium uranium ore.The beryllium mineral is mainly hydroxysilicon beryllite.Sulfide only appears in a very small amount of molybdenite,pyrite,galena,pyrite,etc.in the late period of mineralization.Iron and manganese oxides mainly include hematite,hydromanganese ore and pyrolusite.The most common non-metallic minerals are fluorite and quartz.(2)According to the order of mineral combination and mineral generation,the mineralization process of the deposit is divided into three stages: the first stage isthe uranium mineralization stage,the main mineral combination is asphalt uranium and hematite,followed by hydromanganese,pyrolite,fluorite;The second stage is the beryllium and uranium metallogenic stage,the main mineral combination is hydroxysilicate beryllite,bituminous uranium,fluorite,hydromanganese ore,pyrolusite and hematite;the third stage is the beryllium metallogenic stage,the main mineral combination For hydroxysilicate beryllite,quartz,fluorite.In the late periodof mineralization,a very small amount of pyrite,galena,molybdenite and other sulfide minerals appeared.(3)Two phases of bituminous uranium ore were identified in the ore.The size of bituminous and uranium ore is very fine(generally less than 1 ?m)and the purity is low.The chemical composition of bituminous uranium deposits is characterized by lean Th,REE,impurity elements Si,Ca,Al,Fe,Na,Mn,etc.The content is obviously high,reflecting the characteristics of low temperature mineralization.(4)The characteristics of mineral assemblages reflect that the ore-forming fluids are acidic oxidizing fluids with high Si and F-rich content.The uranium,beryllium and molybdenum mineralization belong to different stages of the same mineralization process.This understanding is basically consistent with the consensus reached at home and abroad on the study of uranium-beryllium deposits related to volcanic hydrothermal fluids. |
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