矿物岩石地球化学通报
礦物巖石地毬化學通報
광물암석지구화학통보
BULLETIN OF MINERALOGY PETROLOGY AND GEOCHEMISTRY
2010年
1期
17-23,30
,共8页
田建吉%胡瑞忠%苏文超%张国全%商朋强%齐有强
田建吉%鬍瑞忠%囌文超%張國全%商朋彊%齊有彊
전건길%호서충%소문초%장국전%상붕강%제유강
流体包裹体%成矿流体%661铀矿床%赣杭成矿带
流體包裹體%成礦流體%661鈾礦床%贛杭成礦帶
류체포과체%성광류체%661유광상%공항성광대
fluid inclusion%ore-forming fluid%No. 661 uranium deposit%Gan-Hang uranium belt
本文利用显微测温学和激光喇曼光谱方法,研究了661铀矿床与铀成矿作用有关的脉石矿物(萤石、石英和方解石)中的流体包裹体.结果表明,成矿早期脉石矿物中的流体包裹体均一温度为130~250℃,盐度为1.65%~3.44 %(NaCl),密度为0.81~1.01 g/cm~3;成矿晚期流体包裹体的均一温度为95~150℃,盐度为1.48%~1.64%(NaCl),密度为0.88~0.96 g/cm~3.这些资料揭示出该矿床的成矿流体为中低温、低盐度、中等密度热液.激光喇曼光谱气相成分分析主要为H_2O,未见其他气体成分.明显不同于岩浆热液矿床中的包裹体特征及其成矿流体的性质,结合该矿床成矿地质特征、氧同位素及区域铀矿床成矿物化条件等资料,进一步分析推断成矿流体的水可能主要来自大气降水.
本文利用顯微測溫學和激光喇曼光譜方法,研究瞭661鈾礦床與鈾成礦作用有關的脈石礦物(螢石、石英和方解石)中的流體包裹體.結果錶明,成礦早期脈石礦物中的流體包裹體均一溫度為130~250℃,鹽度為1.65%~3.44 %(NaCl),密度為0.81~1.01 g/cm~3;成礦晚期流體包裹體的均一溫度為95~150℃,鹽度為1.48%~1.64%(NaCl),密度為0.88~0.96 g/cm~3.這些資料揭示齣該礦床的成礦流體為中低溫、低鹽度、中等密度熱液.激光喇曼光譜氣相成分分析主要為H_2O,未見其他氣體成分.明顯不同于巖漿熱液礦床中的包裹體特徵及其成礦流體的性質,結閤該礦床成礦地質特徵、氧同位素及區域鈾礦床成礦物化條件等資料,進一步分析推斷成礦流體的水可能主要來自大氣降水.
본문이용현미측온학화격광나만광보방법,연구료661유광상여유성광작용유관적맥석광물(형석、석영화방해석)중적류체포과체.결과표명,성광조기맥석광물중적류체포과체균일온도위130~250℃,염도위1.65%~3.44 %(NaCl),밀도위0.81~1.01 g/cm~3;성광만기류체포과체적균일온도위95~150℃,염도위1.48%~1.64%(NaCl),밀도위0.88~0.96 g/cm~3.저사자료게시출해광상적성광류체위중저온、저염도、중등밀도열액.격광나만광보기상성분분석주요위H_2O,미견기타기체성분.명현불동우암장열액광상중적포과체특정급기성광류체적성질,결합해광상성광지질특정、양동위소급구역유광상성광물화조건등자료,진일보분석추단성광류체적수가능주요래자대기강수.
The No. 661 uranium deposit occurs in rhyolite of the Jiuliping Formation, the eastern part of Ganhang uranium belt, Zhejiang Province. The microthermometry and laser Raman spectroscopy analyses of fluid inclusions in fluorite, quartz and calcite associated with uranium mineralization were used to characterize chemical evolution of the ore fluids at the No. 661 uranium deposit. Two types of inclusions, liquid and liquid-vapor inclusions, were observed in these minerals. The homogenization temperatures of the liquid-vapor inclusions in these minerals from early stage to late stage range from 130 to 250℃ and 95 to 150℃, respectively. The calculated salinities and densities of fluids range from 1.65% to 3.44%, 1.48% to 1.64%(NaCl) equivalent and 0.81 to 1.01 g/cm~3, 0.88 to 0.96 g/cm~3, respectively. Laser Raman microspectrometry showed that gaseous compositions of the liquid-vapor inclusions are mainly composed of H_2O. The fluid inclusion data indicated that the ore-forming fluid of the No. 661 uranium deposit could be characterized by moderate to low temperature, low salinity and moderate density. Combined with oxygen isotopic composition and physicochemical conditions in regional uranium deposits, we concluded that the fluid is of deep circulating meteoric origin.