矿床地质
礦床地質
광상지질
MINERAL DEPOSITS
2009年
5期
611-620
,共10页
曹晓峰%吕新彪%何谋春%牛宏%杜保峰%梅微
曹曉峰%呂新彪%何謀春%牛宏%杜保峰%梅微
조효봉%려신표%하모춘%우굉%두보봉%매미
地球化学%黑钨矿%流体包裹体%不透明矿物%红外显微镜%瑶岗仙
地毬化學%黑鎢礦%流體包裹體%不透明礦物%紅外顯微鏡%瑤崗仙
지구화학%흑오광%류체포과체%불투명광물%홍외현미경%요강선
geochemistry%wolframite%fluid inclusion%opaque mineral%infrared microscopy%Yaogangxian
利用红外显微镜对湖南瑶岗仙石英脉型黑钨矿矿床中共生的黑钨矿与石英原生流体包裹体均一温度和冰点的测定结果表明,石英中流体包裹体均一温度范围为149~352℃,主要集中在160~300℃之间,盐度w(NaCl_(eq))为0.9%~9.5%;黑钨矿中流体包裹体均一温度范围为212~386℃,主要集中在280~360℃之间,盐度w(NaCl_(eq))为4.5%~15.2%.可见,黑钨矿中流体包裹体具有更高的均一温度和盐度,与石英中原生流体包裹体均一温度相差可达60℃,盐度w(NaCl_(eq))相差可达6%.结合该矿床的矿石显微结构特征、包裹体岩相学特征及前人所做的氢、氧同位素测试分析结果,推断黑钨矿主要形成于早期阶段,为均一流体冷却成因,石英形成较晚,主要为流体混合成因.
利用紅外顯微鏡對湖南瑤崗仙石英脈型黑鎢礦礦床中共生的黑鎢礦與石英原生流體包裹體均一溫度和冰點的測定結果錶明,石英中流體包裹體均一溫度範圍為149~352℃,主要集中在160~300℃之間,鹽度w(NaCl_(eq))為0.9%~9.5%;黑鎢礦中流體包裹體均一溫度範圍為212~386℃,主要集中在280~360℃之間,鹽度w(NaCl_(eq))為4.5%~15.2%.可見,黑鎢礦中流體包裹體具有更高的均一溫度和鹽度,與石英中原生流體包裹體均一溫度相差可達60℃,鹽度w(NaCl_(eq))相差可達6%.結閤該礦床的礦石顯微結構特徵、包裹體巖相學特徵及前人所做的氫、氧同位素測試分析結果,推斷黑鎢礦主要形成于早期階段,為均一流體冷卻成因,石英形成較晚,主要為流體混閤成因.
이용홍외현미경대호남요강선석영맥형흑오광광상중공생적흑오광여석영원생류체포과체균일온도화빙점적측정결과표명,석영중류체포과체균일온도범위위149~352℃,주요집중재160~300℃지간,염도w(NaCl_(eq))위0.9%~9.5%;흑오광중류체포과체균일온도범위위212~386℃,주요집중재280~360℃지간,염도w(NaCl_(eq))위4.5%~15.2%.가견,흑오광중류체포과체구유경고적균일온도화염도,여석영중원생류체포과체균일온도상차가체60℃,염도w(NaCl_(eq))상차가체6%.결합해광상적광석현미결구특정、포과체암상학특정급전인소주적경、양동위소측시분석결과,추단흑오광주요형성우조기계단,위균일류체냉각성인,석영형성교만,주요위류체혼합성인.
In order to understand the differences between the fluid inclusions in ore minerals and those in gangue mine-rals, the authors performed a microthermometric study of fluid inclusions in wolframite and coexisting quartz from the Yaogangxian quartz-vein wolframite deposit by using infrared microscopy. The results show that homo-geneous temperature (t_h) and salinity of fluid inclusions in quartz are obviously different from those in wol-framite, in spite of the fact that these two minerals were formed at the same ore-forming stage. The data show that the homogeneous temperatures of fluid inclusions in quartz are 149 ~ 352℃, mainly concentrated in the range of 160~300℃, and the salinities are 0.9%~9.5% ; whereas the homogeneous temperatures of fluid in-elnsions in wolframite are 212 ~ 386℃, concentrated at 280 ~ 360℃, and the salinities are 4.5 % ~ 15.2%.Thus, the fluid inclusions in the quartz have lower homogeneous temperature and salinity than those in wol-framite. The differences of homogeneous temperatures between wolframite and quartz can reach 60℃ and those of salinities can reach 6 %. Combined with H, O isotope analyses and ore micro-texture features, the authors have drawn a conclusion that the fluids captured in wolframite were formed at an early stage when the solution was homogeneous, and the temperature declining was the main cause for mineral deposition, whereas the fluids in quartz had mixed fluid properties of igneous fluid and underground water, suggesting their formation at a later stage.