粤北石人嶂石英脉型钨矿床流体包裹体研究—以14~#脉为例
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摘要
通过对石人嶂钨矿主矿脉之一的14#脉中石英包裹体进行研究,发现其类型主要为Ⅰ型(H2O-NaCl体系)及Ⅱ型(液态CO2三相CO2-H2O-NaCl体系)两类,且以Ⅰ型居多。在对Ⅰ型包裹体进行显微测温后得出,成矿流体均一温度(未校正)为183.9℃~413.2℃,冰点温度为-5.9℃~-0.2℃,计算后得出其盐度为0.35wt%~9.08wt%NaCl eqv,密度为0.52~0.95g/cm3,属于低盐度、中低密度流体,与华南热液石英脉钨矿成矿流体大致相当。另外,包裹体均一温度及盐度分布有多峰特性,推断成矿作用具有多期次的特征。孤立包裹体均一温度具有与高程负相关变化的趋势,结合邻区的He-Ar同位素研究,推断流体来源于深部,后有大气水加入。该矿脉石英流体包裹体的研究对进一步探讨矿区矿床成因具有一定的指示意义。
Based on the studies of fluid inclusions in 14#quartz vein,one of the main tungsten mine veins of Shirenzhang,it is found that its main types are typeⅠ(H2O-NaCl system)and type Ⅱ(liquid CO2three-phase CO2-H2O-NaCl system),mostly are typeⅠ;Microthermometry data of typeⅠ inclusions shows that ore-forming fluid homogenization temperature(non-corrected)is 183.9℃ ~413.2℃,ice point temperature is-5.9℃ ~-0.2℃,salinities are 0.35wt% ~ 9.08wt% NaCl eqv,and density is 0.52~0.95g/cm3,which belongs to low salinity,medium-low density level,and it is roughly the same as hydrothermal quartz-vein tungsten ore-forming fluid in south China.In addition,the distribution of homogenization temperature and salinity has multiple peaks,which infer that mineralization has the characteristics of multi-stages.Homogenization temperature of isolated inclusions has a negative correlation with elevation,combining with the study of He-Ar isotopic in the adjacent areas,which infers that the fluid derives from the depth before atmospheric water added in.Fluid inclusion studies of the quartz vein have certain indicative significance for further discussion of ore genesis.
Based on the studies of fluid inclusions in 14#quartz vein,one of the main tungsten mine veins of Shirenzhang,it is found that its main types are typeⅠ(H2O-NaCl system)and type Ⅱ(liquid CO2three-phase CO2-H2O-NaCl system),mostly are typeⅠ;Microthermometry data of typeⅠ inclusions shows that ore-forming fluid homogenization temperature(non-corrected)is 183.9℃ ~413.2℃,ice point temperature is-5.9℃ ~-0.2℃,salinities are 0.35wt% ~ 9.08wt% NaCl eqv,and density is 0.52~0.95g/cm3,which belongs to low salinity,medium-low density level,and it is roughly the same as hydrothermal quartz-vein tungsten ore-forming fluid in south China.In addition,the distribution of homogenization temperature and salinity has multiple peaks,which infer that mineralization has the characteristics of multi-stages.Homogenization temperature of isolated inclusions has a negative correlation with elevation,combining with the study of He-Ar isotopic in the adjacent areas,which infers that the fluid derives from the depth before atmospheric water added in.Fluid inclusion studies of the quartz vein have certain indicative significance for further discussion of ore genesis.
引文
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[14]刘斌,沈昆.流体包裹体热力学[M].北京:地质出版社,1999:87-91.
[15]付建明,李华芹,屈文俊,等.粤北始兴地区石英脉型钨矿成矿时代的确定及其地质意义[J].大地构造与成矿学,2008,32(1):57-62.
[16]汪群英,路远发,陈郑辉,等.赣南淘锡坑钨矿床流体包裹体特征及其地质意义[J].华南地质与矿产,2012,28(1):35-44.
[17]王旭东,倪培,蒋少涌,等.江西漂塘钨矿成矿流体来源的He和Ar同位素证据[J].科学通报,2009,54(21):3338-3344.
[18]林小明,陈国能,冯佐海,等.粤北梅子窝钨矿成矿机理[J].桂林工学院学报,2008,28(3):301-306.
[19]翟伟,孙晓明,邬云山,等.粤北瑶岭—梅子窝钨矿He-Ar同位素地球化学:对华南燕山期壳幔作用过程与成矿的制约[J].矿床地质,2012,57(13):1137-1146.
[2]池国祥,赖健清.流体包裹体在矿床研究中的作用[J].矿床地质,2009,28(6):850-855.
[3]徐克勤,胡受溪,孙明志,等.华南钨矿床的区域成矿条件分析[C]//余鸿彰.钨矿地质讨论会论文集.北京:地质出版社,1984:245-249.
[4]严成文,李文铅,孔唐荣,等.石人嶂钨矿岩浆与成矿作用对中国东部燕山期构造响应浅谈[J].中国钨业,2008,23(2):8-12.
[5]李社宏,李文铅,赵凤生,等.瑶岭—石人嶂钨矿构造动力特征探讨[J].中国钨业,2008,23(3):1-6.
[6]严成文,李文铅,李社宏,等.粤北石人嶂钨矿成矿机理及成矿构造背景[J].中国钨业,2009,24(1):12-15.
[7]胡世杰.石人嶂钨矿构造应力分析[J].南方金属,2006(4):36-40.
[8]广东省地质科学研究所.红岭、石人嶂、师姑山花岗岩基本特征及其钨矿成矿作用[R].广州:广东省地质科学研究所,1985.
[9]韦龙明,汪劲草,朱文凤,等.广东石人嶂-梅子窝钨矿研究新进展[J].桂林工学院学报,2008,28(2):151-156.
[10]汪劲草,韦龙明,朱文凤,等.南岭钨矿“五层楼模式”的结构与构式[J].地质学报,2008,82(7):894-899.
[11]Roedder E.Fluid inclusions[J].Mineralogical Society of America,Reviews in Mineralogy,1984,12:644.
[12]卢焕章,范宏瑞,倪培,等.流体包裹体[M].北京:科学出版社,2004:36-59.
[13]Hall D L,Sterner S M and Bodner R J.Freezing point depression of NaCl-KCl-H2O solutions[J].Economic Geology,1988,100(5):863-886.
[14]刘斌,沈昆.流体包裹体热力学[M].北京:地质出版社,1999:87-91.
[15]付建明,李华芹,屈文俊,等.粤北始兴地区石英脉型钨矿成矿时代的确定及其地质意义[J].大地构造与成矿学,2008,32(1):57-62.
[16]汪群英,路远发,陈郑辉,等.赣南淘锡坑钨矿床流体包裹体特征及其地质意义[J].华南地质与矿产,2012,28(1):35-44.
[17]王旭东,倪培,蒋少涌,等.江西漂塘钨矿成矿流体来源的He和Ar同位素证据[J].科学通报,2009,54(21):3338-3344.
[18]林小明,陈国能,冯佐海,等.粤北梅子窝钨矿成矿机理[J].桂林工学院学报,2008,28(3):301-306.
[19]翟伟,孙晓明,邬云山,等.粤北瑶岭—梅子窝钨矿He-Ar同位素地球化学:对华南燕山期壳幔作用过程与成矿的制约[J].矿床地质,2012,57(13):1137-1146.