| The Huayangchuan deposit is located in the Xiaoqinling metallogenic belt of the Houluchong fold belt in the Qinling orogenic belt.It is a large-scale uranium polymetallic deposit with special ore-forming types at home and abroad.Optical microscopy,modern analytical test methods such as scanning electron microscopy and electron probes are performed on light flakes of representative ore samples.It mainly carried out systematic research on ore mineralogy of Huayangchuan deposit,and provided scientific basis for the study of the genesis of the deposit and the mining process.The Taikoo TTG gneiss in the Huayangchuan deposit is the main ore-bearing surrounding rock of the mineral.The mining area has undergone multiple stages of deformation and metamorphism,magmatic intrusion and tectonic activities,etc.The geological structure is complex,folds and faults develop,NW controlled the distribution of ore-bearing diagenes in the Huayangchuan fault,and the hydrothermal alteration in the mixed pegmatite and quartz carbonate veins is closely related to uranium-lead mineralization.The mineralization process of uranium minerals is mainly divided into four stages:Weijing period,high-medium temperature hydrothermal period,medium-low temperature hydrothermal period and epigenetic period.Among them,betafite ore is mainly formed in the middle of high-temperature warm liquid to early-stage low-temperature hot liquid,and galena is mainly formed in the middle of high-temperatur warm liquid to low-temperature hot liquid.The ore minerals in the Huayangchuan uranium deposit are mainly self-formed—semi-automorphic granular structures,ring-shaped structures and inclusion structures.The ore structure is relatively simple,mainly in the form of spotted structures,sparsely disseminated,veined,and veined.Secondly,the structure is small,and sometimes small local agglomerates of uranium-titanium ore are visible.The uranium minerals in the ore are mainly betafite ore,uranium ore,and contain a small amount of uranothorite.Other metal minerals include:pyrite,galena,magnetite,etc.The gangue minerals are mainly calcite,potassium feldspar,albite,biotite,brown stone,monazite,apatite,titanite,barite and the like.Uranium minerals are mainly formed in the pegmatite veins and carbonate fractures.In the pegmatite veins,uranium minerals form mineral symbiotic combinations with biotite,brown pebbles,apatite,and titanite;In carbonate veins,uranium minerals are present in mineral grains and fissures such as potassium feldspar,quartz,and calcite.The uranium is mainly detected by electron probe micro-analysis and surface scanning in the form of independent uranium minerals such as betafite ore and uranium ore.The remaining small amount of uranium may exist in the form of isomorphism or adsorption.According to the heavy sand analysis method,the uranium-containing minerals and the electron probe are used to analyze the content of uranium in the minerals,and the distribution of uranium in each mineral is obtained.The proportion of UO2 in the betafite ore and the uranium deposit was 78.14%and 15.31%,respectively,while the proportion of other minerals UO2 coexisting with uranium minerals was lower. |
PDF Full Text Request