桂东北花山铀矿床流体包裹体初步研究  

A Preliminary Study on Fluid Inclusions of Huashan Uranium Ore Deposit, Northeastern Guangxi, China

作　　者：黄永高[1,2] 冯佐海[2,3] 付伟[2,3] 康志强[2,3] 孙如良 余勇[2,3] 

机构地区：[1]四川省地质调查院,四川成都610081 [2]广西隐伏金属矿产勘查重点实验室,广西桂林541004 [3]桂林理工大学地球科学学院,广西桂林541004 [4]广西310核地质大队,广西桂林541213

出　　处：《矿物学报》2014年第1期117-124,共8页Acta Mineralogica Sinica

基　　金：广西大规模地质矿产勘查项目(桂财建函编号:[2010]130);广西自然科学基金重点项目(编号:2010GXNSFD013001);广西自然科学基金项目(编号:2012GXNSFAA053187;2012GX NSFBA053132;2013GXNSFBA019209);广西重点实验室建设项目(编号:12-071-20)

摘　　要：对花山铀矿床内与成矿关系密切的各成矿阶段石英进行流体包裹体研究,结果显示,整个成矿作用中主要成矿流体为中-低温、中-低盐度及中等密度热液。从成矿早阶段至晚阶段,成矿流体的演化具有盐度和均一温度不断降低的趋势。C、H、O同位素分析结果表明,流体具有大气降水与深源流体的混合成因。∑CO2来源于幔源脱气作用,对铀的活化迁移起着重要作用,流体混溶导致∑CO2溢出是铀沉淀成矿的主要机制。A series of petrographic, microthermometric, microspectroscopic and stable isotopic studies on fluid inclusions from quartz veins from Huashan uranium ore deposit were conducted. It shows that the dominant ore-forming fluids are characterized by low to moderate temperature and salinity, moderate density, and that the homogenisation temperature and salinity decrease from the early to late ore-forming periods. The carbon, hydrogen and oxygen stable isotopes of fluids reveal that ore-forming fluids are composed of mixed meteoric and magmatic water. The ∑CO2, derived from degassing of the mantle, plays an important role in the activation and migration of uranium. Depressurisation and boiling of CO2-bearing fluids are the principal reason for precipitation and mineralization.

关 键 词：流体包裹体 铀矿床 成矿机制 桂东北 花山 

分 类 号：P618.51[天文地球—矿床学]