Geologic Features and Fluid Inclusions of No.431 Uranium Deposit in Erguna Area, Inner Mongolia
详细信息
- 责任者：Hou Zhaoshuo (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Ren Yunsheng
- 刊名：Geology and Resources
- 出版年：2013
- 卷期：22(3)
- 关键词：铀矿 ; uranium ores ; 流体包裹体 ; fluid inclusions ; 内蒙古 ; Inner Mongolia
- 页码：p.179-184
- 图表：illus., 1 table, 19 refs.
- 分类号：1001
- issnNo：ISSN1671-1947
- isbnNo：CN21-1458/P
摘要
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°C and 322.5 408.9°C,salinities(NaCl)of 12.65%-2.73% and 4.04%-16.94%,and fluid densities of 0.76-0.94 g/cm3and 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.
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