摘要
采用"流体包裹体组合"(FIA)的方法,在详细的岩相学观察的基础上,对盘古山钨矿床主要矿化阶段中早阶段的辉铋矿-黑钨矿-石英脉和晚阶段的(辉铋矿)-黑钨矿-石英脉石英中的流体包裹体进行了显微测温和拉曼探针的分析。该矿床主要矿化阶段含矿石英脉中包裹体主要包括H2O-NaCl型包裹体、H2O-NaCl-CO2型包裹体和少量的CO2型包裹体,富含CO2组分是盘古山钨矿成矿流体的明显特征。实验结果表明,矿床中主要矿化阶段石英脉中两相的H2O-NaCl型包裹体与H2O-NaCl-CO2型包裹体主要均一温度范围较为一致而前者盐度相对较高。辉铋矿-黑钨矿-石英脉中的H2O-NaCl型包裹体的均一温度明显高于(辉铋矿)-黑钨矿-石英脉中的H2O-NaCl型包裹体,但两者的盐度相差不大,从辉铋矿-黑钨矿-石英脉到(辉铋矿)-黑钨矿-石英脉,H2O-NaCl-CO2型包裹体数量减少,CO2型包裹体数量增多。对各类包裹体的激光拉曼探针测试表明,辉铋矿-黑钨矿-石英脉中和(辉铋矿)-黑钨矿-石英脉中的包裹体的组分相近,除水和CO2外,还含有少量的CH4和N2。盘古山钨矿的流体包裹体特征表明,以CO2逸失为特征的流体不混溶作用是矿床金属沉淀的主要机制。
The Pangushan tungsten deposit is an important large-size quartz-vein type W-polymetallic deposit in southern Jiangxi Province.Based on detailed petrographic observations and using the means of Fluid Inclusion Assemblage (FIA),the authors carried out microthermometric and Raman microspectroscopic studies of fluid inclusions in early bismuthinite-wolframite-quartz veins and late (bismuthinite)-wolframite-quartz veins of the main ore-forming stage of the Pangushan tungsten deposit.The fluid inclusions are mainly of H2O-NaCl type and H2O-NaCl-CO2 type together with minor pure CO2 type.The existence of abundant CO2-rich inclusions is a typical feature of the Pangushan Tungsten deposit.Experimental results show that the main homogenization temperature range of the two-phase H2O-NaCl type fluid inclusions is comparable to that of the H2O-NaCl-CO2 type inclusions,while the salinity of the two-phase H2O-NaCl type is higher than that of the H2O-NaCl-CO2 type.In addition,the H2O-NaCl type fluid inclusions show evident decrease in homogenization temperature from the early veins to the late veins at constant salinity.Moreover,less H2O-NaCl-CO2 type inclusions occur in the (bismuthinite)-wolframite-quartz veins while relatively abundant CO2 type inclusions are existent.Raman microspectroscopic studies of various types of inclusions show that,besides water and CO2,the fluid inclusions also contain small amounts of CH4 and N2.The characteristics of fluid inclusions in the Pangushan Tungsten deposit indicate that the fluid immiscibility caused by CO2 escaping possibly led to tungsten precipitation.
引文
Bodnar RJ.2003a.Introduction of fluidinclusions[A].Samson I,An-derson Aand Marshall D.Fluid Inclusions-Analysis and Interpreta-tion.Mineralogical Association of Canada,Short Course Series[C].32:1~8.
Bodnar R J.2003b.Reequilibration of fluid inclusions[A].Samson I,Anderson Aand Marshall D.FluidInclusions-Analysis andInterpre-tation.Mineralogical Association of Canada,Short Course Series[C].32:213~231.
Bowers TS and Helgeson HC.1983.Calculation of the thermodynamicand geochemical consequences of nonideal mixing in the systemH2O-CO2-NaCl on phase relations in geologic systems:equation ofstate for H2O-CO2-NaCl fluids at high pressures and temperatures[J].Geochi m.Cosmochi m.Acta,47:1247~1275.
Brown P E.1989.FLI NCOR:A microcomputer programfor the reduc-tion and investigation of fluid-inclusion data[J].Am.Mineral.,74:1390~1393.
Bussink R Wand Kreulen R.1984.Gas analyses fluidinclusion and sta-bleisotopes of Panasqueira W-Sn deposits,Portugal[J].Bull.Min-eral.,107:703~713.
Cai Jianming,Liu Ruolan,Zeng Guangsheng,et al.1984.Study onfluidinclusion and its relation to mineralization of Pangushan tung-sten deposit,Jiangxi Province,China[A].Yu Hongzhang.Pro-ceedings of Symposium on Tungsten Geology(Chinese edition)[C].Beijing:Geological Publishing House,1~11(in Chinese).
Chi Guoxiang,Zhou Yi ming and Lu Huanzhang.2003.An overviewoncurrent fluid-inclusion research and applications[J].Acta Petrologi-ca Sinica,19(2):201~212(in Chinese with English abstract).
Chi Guoxiang and Lu Huanzhang.2008.Validation and representationof fluid inclusion microthermometric data using the fluid inclusionassemblage(FIA)concept[J].Acta Petrologica Sinica,24(9):1945~1953(in Chinese with English abstract).
Giuliani G,Li Y D and Sheng T F.1988.Fluid inclusion study of Xi-huashan tungsten deposit in the southern Jiangxi province,China[J].Mineral.Deposita,23:24~33.
Goldstein R Hand Reynolds TJ.1994.Systematics of fluidinclusionsindiagenetic minerals[J].SEPMShort Course,31:199.
Goldstein R H.2003.Petrographic analysis of fluidinclusions[A].Sam-son I,Anderson Aand Marshall D.Fluid Inclusions-Analysis andInterpretation.Mineralogical Association of Canada,Short CourseSeries[C],32:9~53.
Graupner T,Kempe Uand Dombon E.1999.Fluid regi me and ore for-mationin the tungsten(-yttrium)deposits of Kyzyltau(MongolianAltai)evidence for fluid variability in tungsten-tin ore systems[J].Chem.Geol.,154:29~40.
Hall D L,Sterner S Mand Bodnar RJ.1988.Freezing point depressionof NaCl-KCl-H2Osolutions[J].Econ.Geol.,83:197~202.
Han Jiuzhu,Hu Xinming and Liu Shilian.1984.The controls of strataover tungsten ore deposits as viewed fromtungsten abundances inthe strata of Southern Jiangxi[J].Geochi mica,(2):176~179(inChinese with English abstract).
Higgins N C.1980.Fluid inclusion evidence for the transport of tung-sten by carbonate complexes in hydrothermal solutions[J].Can.J.Earth Sci.,17:823~830.
Higgins NCand Kerrich R.1982.Progressive18Odepletion during CO2separation froma carbon dioxide-rich hydrothermal fluid:Evidencefromthe Grey River tungsten deposit,Newfoundland[J].Can.J.Earth Sci.,19:2247~2257.
Higgins N C.1985.Wolframite deposition in a hydrothermal vein system:the Grey river tungsten prospect,Newfoundland,Canada[J]Econ.Geol.,80:1297~1327.
Kamilli RJ,Cole J C and Elliott J E.1992.Geology and genesis of theBaid Al Ji malahtungsten deposit,Kingdomof Saudi Arabia[J].E-con.Geol.,88:1743~1767.
Kang Yongfu and Li Chongyou.1991.Geological characteristics,typesand distribution of tungsten depositsin China[J].Mineral Deposit,(10)1:19~26(in Chinese with English abstract).
Kelly WCand Rye R O.1979.Geologic fluidinclusion,and stable iso-tope studies of the tin-tungsten deposits of Panasqueira,Portual[J].Econ.Geol.,74:1721~1822.
Landis G Pand Rye R O.1974.Geologic,fluidinclusion and stableiso-tope studies of the Pasto Bueno tungsten base metal deposit,north-ern Peru[J].Econ.Geol.,69:1025~1059.
Liu Yingjun,Li Zhaolin and Ma Dongsheng.1982.Geochemical studyof tungsten-bearing formationin South China[J].Science in China(Series B),(10):939~950(in Chinese).
Liu Yingjun,Li Zhaolin,Xie Shaoqing,et al.1984.Preli minary exper-i mental study on the geochemistry of tungsten in southeasten China[A].Yu Hongzhang.Proceedings of Symposiumon Tungsten Ge-ology(Chinese edition)[C].Beijing:Geological Publishing House,127~140(in Chinese).
Lu Huanzhang,Fan Hongrui,Ni Pei,et al.2004.Fluid Inclusion[M].Beijng:Science Press,406~419(in Chinese).
Ma Xiujuan.1988.Astudy onthe geochemistry of inclusions of the Da-jishantungsten ore deposit[A].Li Yinqing,Ma Xiujuan and WeiJiaxiu.Application of Fluid Inclusion in Ore Deposit Geology andPetrology[C].Beijing:Beijing Science and Technology Press,65~108(in Chinese with English abstract).
Naden J and Shepherd TJ.1989.Role of methane and carbon dioxideingold deposition[J].Nature,342:793~795.
Noronha F,Doria Aand Dubessy J.1992.Characterization and ti ming of the different types of fluids present inthe barren and ore-veins ofthe W-Sn deposit of Panasqueira.Central Portugal[J].Mineral.Deposita,27:72~79.
Pichavant M,Ramboz C and Weisbrod A.1982.Fluid i mmiscibility innatural processes;use and misuse of fluidinclusion data;I,phase e-quilibria analysis;a theoretical and geometrical approach(in currentresearch on fluidinclusions)[J].Chemical Geology,37(1~2):1~27.
Polya D A.1989.Chemistry of the main-stage ore-forming fluids of thePanasqueira W-Cu(Ag)-Sn Deposit,Portugal:I mplications formodels of ore genesis[J].Economic Geology,84:1134~1152.
Ramboz C,Pichavant Mand Weisbrod A.1982.Fluid i mmiscibility innatural processes;use and misuse of fluid inclusion data;II,inter-pretation of fluidinclusion datainterms of i mmiscibility(in Currentresearch onfluidinclusions)[J].Chemical Geology,37(1~2):29~48.
Ramboz C,Schnapper Dand Dubessy J.1985.The P-V-T-X-fO2evolu-tion of H2O-CO2-CH4-bearing fluids in a wolframite vein:Recon-structionfromfluid inclusion studies[J].Geochi m Cosmochi m Ac-ta,49:205~219.
Rankin A Hand Alderton D H M.1983.Fluidinclusion petrography ofSW England granites and its potential in mineral exploration[J].Mineral Deposita,18:335~347.
Ren Yingchen.1998.Restudy of bismuth sulfosalt minerals in Pan-gushan wolframquartz vein deposit,Jiangxi Province[J].Contribu-tions to Geology and Mineral Resources Research,13(4):1~17(inChinese with English abstract).
Ren Yingchen,Cheng Minqing and Wang Cunchang.1986.Character-istics and vertical zoning of tungsten-bismuth minerals in the Pan-gushan quartz veintype deposit of Jiangxi Province[J].Mineral De-posit,(5)2:63~74(in Chinese with English abstract).
Rios FJ,Villas R Nand Fuzikawa K.2003.Fluid evolutionin the Pe-dra Preta wolframite ore deposit,Paleproterozoic Musa granite,Easten Amazon craton,Brazil[J].Journal of South American EarthSciences,15:790-794.
Roedder E.1984.Fluid inclusions.Mineralogical Society of America,Reviews in Mineralogy[M],12:644.
Seal R RII,Clark A Hand Morrissy C J.1987.Stockwork tungsten(scheelite)-molybdenum mineralization,Lake George,SouthwesternNew Brunswick[J].Economic Geology,82:1259~1282.
Shelton K L,Supso C,Rye D M,et al.1986.Geologic,Sulfur iso-tope,andfluidinclusion studies of the Sannae W-Mo Mine,Repub-lic of Korea:Comparison of Sulfur isotope systematicsin Korean WDeposits[J].Economic Geology,81:430~446.
Sheng Jifu.2004.Tungsten deposit[A].Zhao Yi ming,Wu Liangshi,Bai Ge,et al.Metallogeny of the major metallic ore depositsin Chi-na[C].Beijing:Geological Publishing House,146(in Chinese withEnglish abstract).
Shepherd T J,Rankin A Hand Alderton D H M.1985.A PracticalGuide to FluidInclusion Studies[M].Blackie&Son Li mited.,1~154.
Tan Yunjin,Deng Guozheng,Pi Junming,et al.2002a.Geological-geochemical features of strongsilicifidrockandtheir exploratorysig-nificance[J].China TungstenIndustry,(17)2:14~20(in Chinesewith English abstract).
Tan Yunjin,Tong Qiquan,Pi Junming,et al.2002b.Geological-geo-chemical features of ore-near hydrothermal alteration rocks in Pan-gushan tungsten deposit[J].China Tungsten Industry,(17)5:21~26(in Chinese with English abstract).
Thorn P G.1988.Fluid inclusion and stable isotope studies at theChicote tungsten deposit,Bolivia[J].Economic Geology,83:62~68.
Vallance J,Cathelineau M,Mariganc C,et al.2001.Microfracturingand fluid mixingin granites:W-(Sn)ore deposition at Vaulry(NEFrench Massif Central)[J].Tectonophysics,336:43~61.
Wang Xudong,Ni Pei,Jiang Shaoyong,et al.2008.Fluid inclusionstudy on the Piaotang tungsten deposit,Southern Jiangxi Province,China[J].Acta Petrologica Sinica,24(9):2163~2170(in Chi-nese with English abstract).
Wood S Aand Samson I M.2000.The hydrothermal geochemistry oftungstenin granitoid environments:I.Relative solubilities of fer-berite and scheelite as a function of T,P,pHand mNaCl[J].Econ.Geol.,95:143~182.
Xu Keqin and Cheng Hai.1987.Tectonic environment for the formationof tungsten deposits in China[J].Contributions to Geology andMineral Resources Research,2(3):1~7(in Chinese with Englishabstract).
Xu Keqin,Hu Shouxi,Sun Mingzhi,et al.1984a.Regional factorscontrolling the formation of tungsten deposits in south China[A].Yu Hongzhang.Proceedings of Symposium on Tungsten Geology(Chinese edition)[C].Beijing:Geological Publishing House,245~249(in Chinese).
Xu Keqin,Sun Nai,Wang Dezi,et al.1984b.Genesis and metallogen-esis of granites of South China[A].Xu Keqin,Tu Gangzhi.Gran-ite and Related of Metallogenesis(Collected Papers of InternationalSymposium)[C].Nanjing:Jiangsu Science and Technology Press,1~20(in Chinese).
Ye Ji wei,Deng Guozheng,Pi Junming,et al.2000.An analysis onthecharacteristics of deep deposit of Pangushan tungsten mine and thevistas of prospecting[J].China TungstenIndustry,(15)4:17~19(in Chinese with English abstract).
Zaw U K.1984.Geology and Geothermometry of vein-type W-Sn de-positsat Pennaichaung and Yetkanzintaung prospects,Tavoy Town-ship,Tennasseri m Division,Southern Burma[J].Mineral.Deposi-ta,19:138~144.
Zeng Guangsheng.1980.Ore-hosting fissure and blind orebody predic-tion of Pangushan tungsten deposit[J].Geology and Exploration,(12):13~16(in Chinese).
Zeng Zailin,Zhu Xiangpei and XuJianxiang.2007.Tungstenreserves ofSouthern Jiangxi province and prospecting outlook[J].China Tung-sten Industry,(22)6:16~18(in Chinese with English abstract).
Zhu Yanling,Li Chongyou and Lin Yunhuai.1981.Tungsten Geologyof South Jiangxi[M].Nanchang:Jiangxi People’s PublishingHouse,249~253(in Chinese).
蔡建明,刘若兰,曾广胜.1984.江西盘古山钨矿流体包裹体及其与成矿关系研究[A].余鸿彰.钨矿地质讨论会论文集(中文版)[C].北京:地质出版社,1~11.
池国祥,卢焕章.2008.流体包裹体组合对测温数据有效性的制约及数据表达方法[J].岩石学报,24(9):1945~1953.
池国祥,周义明,卢焕章.2003.当前流体包裹体研究和应用概况[J].岩石学报,19(2):201~212.
韩久竹,胡心铭,刘世濂.1984.从赣南地层含钨丰度看地层对钨矿的控制[J].地球化学,(2):176~179.
康永孚,李崇佑.1991.中国钨矿地质特征、类型及其分布[J].矿床地质,(10)1:19~26.
刘英俊,李兆麟,马东升.1982.华南含钨建造的地球化学研究[J].中国科学(B辑),(10):939~950.
刘英俊,李兆麟,谢少卿,等.1984.华南钨矿实验地球化学研究[A].余鸿彰.钨矿地质讨论会论文集(中文版)[C].北京:地质出版社,127~140.
卢焕章,范宏瑞,倪培,等.2004.流体包裹体[M].北京:科学出版社,406~419.
马秀娟.1988.大吉山钨矿包裹体地球化学研究[A].李萌清,马秀娟,魏家秀.流体包裹体在矿床学和岩石学中的应用[M].北京:北京科技出版社,65~108.
任英忱.1998.江西盘古山-黄沙黑钨矿石英脉矿床铋硫盐矿物再研究[J].地质找矿论丛,13(4):1~17.
任英忱,程敏清,王存昌.1986.江西盘古山石英脉型钨矿床钨铋矿物特征及矿物的垂直分带[J].矿床地质,(5)2:63~74.
盛继福.2004.钨矿床[A].赵一鸣,吴良士,白鸽,等.中国主要金属矿床成矿规律[M].北京:地质出版社,146.
谭运金,邓国政,皮俊明,等.2002a.强硅化岩的地质、地球化学特征及其找矿评价意义[J].中国钨业,(17)2:14~20.
谭运金,童启荃,皮俊明,等.2002b.盘古山钨矿床近矿热液蚀变岩石的地质地球化学[J].中国钨业,(17)5:21~26.
王旭东,倪培,蒋少涌,等.2008.赣南漂塘钨矿流体包裹体研究[J].岩石学报,24(9):2163~2170.
徐克勤,程海.1987.中国钨矿形成的大地构造背景[J].地质找矿论丛,2(3):1~7.
徐克勤,胡受奚,孙明志,等.1984a.华南钨矿床的区域成矿条件分析[A].余鸿彰.钨矿地质讨论会论文集(中文版)[C].北京:地质出版社,245~249.
徐克勤,孙鼐,王德滋,等.1984b.华南花岗岩成因与成矿[A].徐克勤,涂光炽.花岗岩地质和成矿关系(国际学术会议论文集)[C].南京:江苏科学技术出版社,1~20.
叶际祎,邓国政,皮俊明,等.2000.盘古山钨矿深部矿床赋存特征分析及找矿前景[J].中国钨业,(15)4:17~19.
曾载淋,朱祥培,许建祥.2007.赣南钨矿资源状况与资源远景展望[J].中国钨业,(22)6:16~18.
曾广胜.1980.盘古山钨矿容矿裂隙及盲矿预测[J].地质与勘探,(12):13~16.
朱焱龄,李崇佑,林运淮.1981.赣南钨矿地质[M].南昌:江西人民出版社,249~253.
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