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.
出处
《矿物学报》
CAS
CSCD
北大核心
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)
关键词
流体包裹体
铀矿床
成矿机制
桂东北
花山
fluid inclusions
uranium ore deposit
metallogenetic mechanism
northeastern Guangxi province
Huashan
