地质与资源2013，Vol.22Issue(3)：179-184,6.
内蒙古额尔古纳地区431铀矿床地质特征与流体包裹体研究
GEOLOGIC FEATURES AND FLUID INCLUSIONS OF NO.431 URANIUM DEPOSIT IN ERGUNA AREA, INNER MONGOLIA
摘要
Abstract
To recognize the metallogenic features and genetic type of the uranium deposits in Erguna area,No.431 uranium deposit is adopted for case study.Based on geological features of the deposit,microthermometry of fluid inclusions is researched for silicified quartz veins closely related to the genesis of uranium mineralization.The results show that the deposit occurs in the contact zone between the Indosinian granite and the Neoproterozoic Ergun metamorphic rocks,obviously controlled by faults.The wallrocks of ore bodies are generally developed with such alterations as silicification,chloritization,kaolinization and carbonation.The uranium mineral is dominantly autunite in the surface.Comparison studies of this deposit with some typical granitic uranium deposits indicate that No.431 deposit is associated with granitic magmatism.The silicified quartz veins contain two types of inclusions,i.e.gas-liquid two-phase and CO2-bearing three-phase inclusions,corresponding to homogenization temperatures of 132.2-301.5℃ and 322.5-408.9℃,salinities (NaCl) of 12.65％-2.73％ and 4.04％-16.94％,and fluid densities of 0.76-0.94 g/cm3 and 0.60-0.78g/cm3.It is concluded that the uranium ore-forming fluid belongs to a NaCl-H2O-CO2 fluid system with medium temperature,mid-low salinity and low density.The mineralization depth of the uranium deposits in this area estimated by related formulas ranges from 0.4 to 1.7 km,which suggests a mesothermal deposit.关键词
431铀矿床/流体包裹体/中温热液矿床/额尔古纳地区/内蒙古Key words
No.431 uranium deposit/ fluid inclusion/ mesothermal deposit/ Erguna area/ Inner Mongolia分类
天文与地球科学引用本文复制引用
侯召硕,任云生,王晰,孙德有,苟军,王天豪..内蒙古额尔古纳地区431铀矿床地质特征与流体包裹体研究[J].地质与资源,2013,22(3):179-184,6.基金项目
中国核工业地质局项目(201151)和中国地质调查局项目(1212011121081)联合资助. （201151）
