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时间:2020-03-26
《粤北石人嶂石英脉型钨矿床流体包裹体研究—以14-号脉为例.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第66卷第6期有色金属(矿山部分)2014年11月doi:10.3969/J.issn.1671—4172.2014.06.007粤北石人嶂石英脉型钨矿床流体包裹体研究一以14脉为例田野,周曼胡,韦龙明,裴秋明,王莉,赖传勇(1.桂林理工大学地球科学学院,广西桂林541004;2.广西壮族自治区三。七核地质大队,广西贵港537100)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-NaC1体系)及Ⅱ型(液态CO三相CO一H。O-NaC1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
2、温度(未校正)为183.9℃~413.2℃,冰点温度为一5.9~C~一0.2℃,计算后得出其盐度为0.35wt~9.08wtNaC1eqv,密度为0.52~0.95g/cm。,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。关键词:石英脉型钨矿;流体包裹体;显微测温;石人蟑;粤北中图
3、分类号:TD11文献标志码:A文章编号:1671-4172(2014)06—0024—06StudyonfluidinclusionofShirenzhangquartz-veintypetungstendepositinnorthernGuangdongprovince-Taking14#veinasanexampleTIANYe,ZHOUMinyue,WEILongming,PEIQiuming,WANGLi,LAIChuanyong(1.CollegeofEarthSciences,GuilinUniversityofTechnology,Gu
4、ilinGuangxi541006,China;2.307NuclearGeologicalBrigadeofGuangxiZhuangAutonomousRegion,GuigangGuangxi537100,China)Abstract:Basedonthestudiesoffluidinclusionsin14quartzvein,oneofthemaintungstenmineveinsofShirenzhang,itisfoundthatitsmaintypesaretypeI(H2O-NaC1system)andtypeⅡ(1iquidC
5、O2three—phaseCO2一H2O-NaC1system),mostlyaretypeI;MicrothermometrydataoftypeIinclusionsshowsthatore—formingfluidhomogenizationtemperature(non—corrected)is183.9"C~413.2~C,icepointtemperatureis一5.9"C~一0.2"C,salinitiesare0.35wt~9.08wtNaC1eqv,anddensityis0.52~O.95g/cm。,whichbelongstO
6、lowsalinity,medium—lowdensitylevel,anditisroughlythesameashydrothermalquartz—veintungstenore—formingfluidinsouthChina.Inaddition,thedistributionofhomogenizationtemperatureandsalinityhasmultiplepeaks,whichinferthatmineralizationhasthecharacteristicsofmulti—stages.Homogenizationt
7、emperatureofisolatedinclusionshasanegativecorrelationwithelevation,combiningwiththestudyofHe-Arisotopicintheadjacentareas,whichinfersthatthefluidderivesfromthedepthbeforeatmosphericwateraddedin.Fluidinclusionstudiesofthequartzveinhavecertainindicativesignificanceforfurtherdiscu
8、ssionoforegenesis.Keywords:quartzveintungsten;fluidinc
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