CAJ | 학술논문

内蒙古林西地区是我国东部重要的萤石矿集区之一,对该区四个萤石矿床的流体包裹体研究发现,主要发育液相包裹体,还发育少量气相包裹体、含子矿物多相包裹体.显微测温结果显示成矿流体均一温度集中在140~270℃之间,盐度变化范围为0.18%~4.65%NaCleqv,密度变化范围为0.61~0.95 g/cm3,属中低温、低盐度、低密度的NaCl-H2O体系流体;激光拉曼结果表明包裹体成分以H2O为主,含有H2和C3H6.根据显微测温结果,认为水/岩反应很可能是该区萤石沉淀的主要机制.结合地质特征以及普遍低的均一温度和盐度,认为该区萤石矿具有大气降水热液成因特征,成因类型属于中低温热液裂隙充填型萤石矿床.
내몽고림서지구시아국동부중요적형석광집구지일,대해구사개형석광상적류체포과체연구발현,주요발육액상포과체,환발육소량기상포과체、함자광물다상포과체.현미측온결과현시성광류체균일온도집중재140~270℃지간,염도변화범위위0.18%~4.65%NaCleqv,밀도변화범위위0.61~0.95 g/cm3,속중저온、저염도、저밀도적NaCl-H2O체계류체;격광랍만결과표명포과체성분이H2O위주,함유H2화C3H6.근거현미측온결과,인위수/암반응흔가능시해구형석침정적주요궤제.결합지질특정이급보편저적균일온도화염도,인위해구형석광구유대기강수열액성인특정,성인류형속우중저온열액렬극충전형형석광상.
Linxi region, Inner Mongolia, is one of the most important fluorite ore districts in eastern China. Studies on four fluorite deposits show that fluid inclusions are mostly liquid inclusions, with a few gas inclusions and few daughter mineral-bearing multiphase inclusions. Microthermometry results show that homogenization temperature of ore-forming fluid concentrates between 140–270℃;whereas salinity ranges from 0.18%to 4.65%NaCleqv;and density ranges from 0.61 to 0.95 g/cm3. The ore-forming fluid belongs to NaCl-H2O fluid system, which is characterized by middle-low temperature, low salinity and low density. The compositions of fluid inclusions are mainly H2O, with some H2 and C3H6. Microthermometry results suggest that water-rock reaction is the principal mechanism of fluorite precipitation. According to the geologic feature and the low homogenization temperature and salinity, these fluorite deposits are characterized by hydrothermal origin of meteoric water. The fluorite deposits belong to middle-low temperature hydrothermal type deposit.