相山居隆庵矿床铀成矿流体特征及其来源探讨

通过居隆庵矿床流体包裹体岩相学、显微测温学、单个流体包裹体激光拉曼成分及群体包裹体成分的对比研究,查明了成矿流体的基本性质(温度、盐度及成分等);根据成矿流体的碳、氢、氧等稳定同位素特征,并结合矿床的地质-构造特征,探讨了成矿流体的来源。研究表明,居隆庵矿床铀成矿流体为富含成矿物质及挥发分(CO2、H2、CH4等)的中-高温、中-高盐度流体,其成分以C、H、O、N等为主,并溶有多种碱金属、P及卤素(F、Cl)等微量组分的C-H-O流体,成矿流体具有深源(幔源)性的特点。

Characteristics and origin of ore-forming fluid of Julong'an uranium deposit in Xiangshan uranium orefield

On the basis of field survey, comparative study of petrography, microthermometry, Laser Raman ingredient and gas chromatogram ingredient of fluid inclusions, the authors found out the basic characteristics(temperature, salinity, ingredients etc.)of the ore-forming fluids in the Julong'an uranium deposit. According to the compositions of carbon, hydrogen and oxygen stable isotopes of ore-forming fluids in combination with the characteristics of geological structure of the Julong'an uranium deposit, this paper investigated the origin of the ore-forming fluids. The results indicate that the ore-forming fluids were medium-to high-temperature and medium-to high-salinity fluids which were enriched with abundant ore-forming materials and volatiles such as CO₂, H₂ and CH₄, and contained lots of such materials as alkali metals, P and halogen. The ore-forming fluids were mostly deep-derived (mantle source) fluids.