江西东乡铜矿流体包裹体研究
摘要
本文主要对江西东乡铜矿成矿流体进行研究,探讨其成矿机制,分析成矿流体性质以及成矿流体来源。通过石英中流体包裹体的岩相学研究和显微测温可以发现,第一阶段石英中流体包裹体的温度介于144~195℃,流体盐度0.35%~4.95%NaCleqv,第二阶段的流体温度有所升高,均一温度193~298℃,盐度1.40%~6.59%NaCleqv。第三阶段属于成矿期流体,捕获了富气相、富液相和含子晶三相包裹体,其端员均一温度主要在300~340℃和280~320℃之间,盐度介于0.35%~5.86%NaCleqv和29.4%~41.9%NaCleqv之间。激光拉曼探针分析表明,拉曼探针分析反映了前两个阶段流体挥发份主要为水蒸气。第三阶段石英中流体包裹体的气相成分含有H2O、CO2和CH4。流体包裹体研究表明,东乡铜矿第三阶段的流体包裹体发生了明显的沸腾作用,因此,减压沸腾可能是导致流体中金属元素卸载的主要因素。同时,第三阶段流体的H-O同位素特征显示东乡铜矿具有岩浆水特征。
According to the study on the metallogenic fluid characteristic from Dongxiang copper deposit,we examine the metallogenic mechanism,the nature and origin of ore-forming fluid.Based on petrographic observations of ore-bearing quartz collected from the deposit,we have found that there are three different generations of quartz.Fluid inclusion studies show that the homogenization temperature and primary salinities are 144~195℃ and 0.35%~4.95% NaCleqv in the first generation,respectively.The second generation formed in relatively higher temperature range 193~298℃,and salinities are 1.40%~6.59% NaCleqv.The thrid generation of quartz mainly consists of pyrite,chalcopyrite and quartz,the primary inclusions are generally three types:vapor(type II),brine(type I),and daughter-mineral bearing multiphase inclusions(type V)in the third generation.The statistics on the measured filling temperatures of type II and type V reveal peaks at 300~340℃ and 280~320℃ respectively,while those on the salinities of fluid inclusions peak at 0.35%~5.86% NaCleqv and 29.4%~41.9% NaCleqv respectively.Raman analysis of the fluid inclusions indicates that,in the gaseous phase,water vapor is dominant with small amount of CO2 and CH4.Hydrogen and Oxygen isotopic compositions are within the range of magmatic water.Fluid boiling resulted in the discharge of a large amount of copper from Cu-bearing fluid.
According to the study on the metallogenic fluid characteristic from Dongxiang copper deposit,we examine the metallogenic mechanism,the nature and origin of ore-forming fluid.Based on petrographic observations of ore-bearing quartz collected from the deposit,we have found that there are three different generations of quartz.Fluid inclusion studies show that the homogenization temperature and primary salinities are 144~195℃ and 0.35%~4.95% NaCleqv in the first generation,respectively.The second generation formed in relatively higher temperature range 193~298℃,and salinities are 1.40%~6.59% NaCleqv.The thrid generation of quartz mainly consists of pyrite,chalcopyrite and quartz,the primary inclusions are generally three types:vapor(type II),brine(type I),and daughter-mineral bearing multiphase inclusions(type V)in the third generation.The statistics on the measured filling temperatures of type II and type V reveal peaks at 300~340℃ and 280~320℃ respectively,while those on the salinities of fluid inclusions peak at 0.35%~5.86% NaCleqv and 29.4%~41.9% NaCleqv respectively.Raman analysis of the fluid inclusions indicates that,in the gaseous phase,water vapor is dominant with small amount of CO2 and CH4.Hydrogen and Oxygen isotopic compositions are within the range of magmatic water.Fluid boiling resulted in the discharge of a large amount of copper from Cu-bearing fluid.
引文
[1]江西省地质矿产局九一一队.1966.江西省东乡县枫林铜矿区地质勘探储量报告书
[2]江西省地质矿产局九一二队.1985.江西枫林式铜钨矿床地质特征与找矿方向
[3]中南大学地质系.1997.东乡铜矿富矿预测及外围找矿研究
Bodnar RJ.1983.A method of calculating fluid inclusion volumes basedon vapor bubble diameters andPVTXproperties of inclusion fluids.Economic Geology,78:535-542.
Bodnar RJ.1993.Reviced equation and table for determining for the freezing point depression of H2O-NaCl solutions.Geochim.Cosmochim.Acta,57:683-684
Brown PE.1989.FLINCOR:A microcomputer program for the reductionand investigation of fluid-inclusion data.Am.Mineral.,74:1390-1393
Du YS,Tian SH and Li XJ.2000.Contrast in fluid mineralizationbetween tianmashan and datuanshan ore deposits,Tongling,Anhui.Earth Science,25(4):433-437(in Chinese with Englishabstract)
Fu SH.2003.The research on the distributing lawof ore-forming elementand the tectono-metallogenic characteristics of Dongxiang copperdeposit.Master Degree Thesis.Guangzhou:Guangzhou Institute ofGeochemistry,Chinese Academy of Sciences(in Chinese withEnglish summary)
Fu SH and Chen GH.2003.Metallogenic features and prospectingresearch of Dongxiang porphyry copper deposit.Geotectonica etMetallogenia,27(3):282-286(in Chinese with English abstract)
Gu LX and Xu KQ.1986.On the Carboniferous submarine massivesulphide deposits in the Lower Reaches of the Changjiang(Yangzi)River.Mineral Deposits,2:1-13(in Chinese with Englishabstract)
Gu LX and Xu KQ.1987.The tectonic development and relatedmetallogenesis of the Lower Yangtze fault depression belt.Journal ofGuilin University of Technology,4:243-251(in Chinese withEnglish abstract)
Huang XC and Zhang ZL.1979.On the occurrence of Carboniferousvolcanics of the Fenglin district,Dongxiang,Jiangxi.Journal ofJiangxi Normal University(Natural Sciences Edition).1:41-50(inChinese with English abstract)
Hall DL,Sterner SMand Bodna RJ.1988.Freezing point depression ofNaCl-KCl-H2O solutions.Economic Geology,83:197-202
Heinrich CA.2007.Fluid-fluid interactions in magmatic-hydrothermalore formation.Reviews in Mineralogy and Geochemistry,65:363-387
Li PZ,Deng GP and Tao H.1999.Analysis of tectonic evolution andmajor Cu(Au)polymetallic metallogenic series in Northeast JiangxiProvince.Geotectonic et Metallogenia,23(4):300-307(inChinese with English abstract)
Lu HZ,Fan HR,Ni Pet al.2004.Fluid Inclusions.Beijing:SciencePress(in Chinese with English abstract)
Ni P,Tian JH,Zhu XTet al.2005.Fluid inclusion studies on footwallstringer system mineralization of Yongping massive copper deposit,Jiangxi Province,China.Acta Petrologica Sinica,21(5):1339-1346(in Chinese with English abstract)
Pichavant M,Ramboz C and Weisbrod A.1982.Fluid immiscibility innatural processes;use and misuse of fluid inclusion data;I,Phaseequilibria analysis;a theoretical and geometrical approach(incurrent research on fluid inclusions).Chemical Geology,37:1-27
Roedder E.1984.Fluid inclusions.Reviews in Mineralogy,12:644
Xu KQ.1980.Some questions of Fe or Cu ore deposits in marine faultdepression troughs on the continental crust of the Southeast China.Essays on the International Communication of Geological Research.Beijing:Geologicl Publishing House(in Chinese)
Xu KQ.1982.Geological sciences and economic geology.WorldScience,6:1-4(in Chinese)
Xu KQ,Wang HN and Zhou JP and Zhu JC.1996.A discussion on theexhalative sedimentary massive sulfide deposits of South China.Geological Journal of China Universities,2(3):241-257(inChinese with English abstract)
Xu YT.1994.The tectonic background,characteristics of sedimentarysilicslites and mineralization mechanism of the massive sulfidedeposits in Qiantangjiang and Xinjing area.Ph.D.Dissertation.Nanjing:Nanjing University,1-171(in Chinese with Englishsummary)
Xu YT.1997.The origin and geochemical characteristics of sedimentarysilicalites in Dongxiang mine,Jiangxi Province.ActaSedimentologica Sinica,15(3):110-114(in Chinese with Englishabstract)
Xue JY,Sun T,Zhang WLet al.2000.Some microstructures of coppersulfides in Dongxiang copper mine,Jiangxi Province,and theirgeological implications.Geological Journal of China Universities,6(2):149-155(in Chinese with English abstract)
Zhai YS and Yao SZ.1995.Cu-Au metallogenic series related tovolcanic-intrusive complex in eastern China.Journal of ChinaUniversity of Geosciences,6(1):107-113
Zhang GL.2001.Peel fault system of Dongxiang copper deposit and itsore-controlling significance.Mineral Resources and Geology,15(3):157-161(in Chinese with English abstract)
Zhou XM and Zhu YH.1992.Magmatic mixing of Jiangshan-Shaoxingfracture belt and related Precambrian geology.Science in China(Series B),22(3):298-303(in Chinese)
Zhu JC and Zhang CH.1981.On the occurrence of Carboniferousvolcanics and origin of the copper and tungsten deposits of theFenglin district,Dongxiang,Jiangxi.Journal of Nanjing University(Nat.Sci.Ed.),2:269-282(in Chinese with English abstract)
Zhu XT.2005.Research on geneses of Yongping and Dongxiang copperdeposit,Jiangxi Province.Master Degree Thesis.Nanjing:NanjingUniversity(in Chinese with English summary)
杜杨松,田世洪,李学军.2000.安徽铜陵天马山矿床与大团山矿床流体成矿作用对比研究.地球科学,25(4):433-437
付守会.2003.江西东乡铜矿成矿元素分布规律及构造成矿特征研究.硕士学位论文.广州:中国科学院广州地球化学研究所
付守会,陈广浩.2003.江西东乡铜矿成矿地质特征与找矿实践.大地构造与成矿学,27(3):282-286
顾连兴,徐克勤.1986.论大陆地壳断裂拗陷带中的华南型块状硫化物矿床.矿床地质,2:1-13
顾连兴,徐克勤.1987.长江中、下游断裂拗陷带的构造发展与成矿作用.桂林冶金地质学院学报,4:243-251
黄旭初,张祖廉.1979.江西东乡枫林石炭系火山岩.江西师院学报,1:41-50
李培铮,邓国萍,陶红.1999.赣东北壳体构造演化与铜(金)多金属成矿系.大地构造与成矿学,23(4):300-307
卢焕章,范宏瑞,倪培等.2004.流体包裹体.北京:科学出版社
倪培,田京辉,朱筱婷.2005.江西永平铜矿下盘网脉状矿化的流体包裹体研究.岩石学报,21(5):1339-1346
徐克勤.1980.论中国东南部几个断裂拗陷带中某些铁铜矿床的成因问题.国际交流地质学术论文集.北京:地质出版社
徐克勤.1982.地质科学与矿床学.世界科学,6:1-4
徐克勤,王鹤年,周建平,朱金初.1996.论华南喷流-沉积块状硫化物矿床.高校地质学报,2(3):241-257
徐跃通.1994.钱塘江-信江地区块状硫化物矿床大地构造背景、硅质岩特征与成矿机制.博士学位论文.南京:南京大学,1-171
徐跃通.1997.江西东乡矿区沉积硅质岩的地球化学特征和成因.沉积学报,15(3):110-114
薛纪越,孙涛,张文兰等.2000.江西东乡铜矿中含铜硫化物的几种微结构及其地质意义.高校地质学报,6(2):149-155
张国林.2001.东乡铜矿剥离断层系统及其控矿意义.矿产与地质,15(3):157-161
周新民,朱云鹤.1992.江绍断裂带的岩浆混合作用及其两侧的前寒武纪地质.中国科学(B辑),22(3):298-303
朱金初,张承华.1981.江西东乡枫林石炭纪火山岩及铜-钨矿床的成因,南京大学学报,2:269-282
朱筱婷.2005.江西永平、东乡铜矿成因研究.硕士学位论文.南京:南京大学
[2]江西省地质矿产局九一二队.1985.江西枫林式铜钨矿床地质特征与找矿方向
[3]中南大学地质系.1997.东乡铜矿富矿预测及外围找矿研究
Bodnar RJ.1983.A method of calculating fluid inclusion volumes basedon vapor bubble diameters andPVTXproperties of inclusion fluids.Economic Geology,78:535-542.
Bodnar RJ.1993.Reviced equation and table for determining for the freezing point depression of H2O-NaCl solutions.Geochim.Cosmochim.Acta,57:683-684
Brown PE.1989.FLINCOR:A microcomputer program for the reductionand investigation of fluid-inclusion data.Am.Mineral.,74:1390-1393
Du YS,Tian SH and Li XJ.2000.Contrast in fluid mineralizationbetween tianmashan and datuanshan ore deposits,Tongling,Anhui.Earth Science,25(4):433-437(in Chinese with Englishabstract)
Fu SH.2003.The research on the distributing lawof ore-forming elementand the tectono-metallogenic characteristics of Dongxiang copperdeposit.Master Degree Thesis.Guangzhou:Guangzhou Institute ofGeochemistry,Chinese Academy of Sciences(in Chinese withEnglish summary)
Fu SH and Chen GH.2003.Metallogenic features and prospectingresearch of Dongxiang porphyry copper deposit.Geotectonica etMetallogenia,27(3):282-286(in Chinese with English abstract)
Gu LX and Xu KQ.1986.On the Carboniferous submarine massivesulphide deposits in the Lower Reaches of the Changjiang(Yangzi)River.Mineral Deposits,2:1-13(in Chinese with Englishabstract)
Gu LX and Xu KQ.1987.The tectonic development and relatedmetallogenesis of the Lower Yangtze fault depression belt.Journal ofGuilin University of Technology,4:243-251(in Chinese withEnglish abstract)
Huang XC and Zhang ZL.1979.On the occurrence of Carboniferousvolcanics of the Fenglin district,Dongxiang,Jiangxi.Journal ofJiangxi Normal University(Natural Sciences Edition).1:41-50(inChinese with English abstract)
Hall DL,Sterner SMand Bodna RJ.1988.Freezing point depression ofNaCl-KCl-H2O solutions.Economic Geology,83:197-202
Heinrich CA.2007.Fluid-fluid interactions in magmatic-hydrothermalore formation.Reviews in Mineralogy and Geochemistry,65:363-387
Li PZ,Deng GP and Tao H.1999.Analysis of tectonic evolution andmajor Cu(Au)polymetallic metallogenic series in Northeast JiangxiProvince.Geotectonic et Metallogenia,23(4):300-307(inChinese with English abstract)
Lu HZ,Fan HR,Ni Pet al.2004.Fluid Inclusions.Beijing:SciencePress(in Chinese with English abstract)
Ni P,Tian JH,Zhu XTet al.2005.Fluid inclusion studies on footwallstringer system mineralization of Yongping massive copper deposit,Jiangxi Province,China.Acta Petrologica Sinica,21(5):1339-1346(in Chinese with English abstract)
Pichavant M,Ramboz C and Weisbrod A.1982.Fluid immiscibility innatural processes;use and misuse of fluid inclusion data;I,Phaseequilibria analysis;a theoretical and geometrical approach(incurrent research on fluid inclusions).Chemical Geology,37:1-27
Roedder E.1984.Fluid inclusions.Reviews in Mineralogy,12:644
Xu KQ.1980.Some questions of Fe or Cu ore deposits in marine faultdepression troughs on the continental crust of the Southeast China.Essays on the International Communication of Geological Research.Beijing:Geologicl Publishing House(in Chinese)
Xu KQ.1982.Geological sciences and economic geology.WorldScience,6:1-4(in Chinese)
Xu KQ,Wang HN and Zhou JP and Zhu JC.1996.A discussion on theexhalative sedimentary massive sulfide deposits of South China.Geological Journal of China Universities,2(3):241-257(inChinese with English abstract)
Xu YT.1994.The tectonic background,characteristics of sedimentarysilicslites and mineralization mechanism of the massive sulfidedeposits in Qiantangjiang and Xinjing area.Ph.D.Dissertation.Nanjing:Nanjing University,1-171(in Chinese with Englishsummary)
Xu YT.1997.The origin and geochemical characteristics of sedimentarysilicalites in Dongxiang mine,Jiangxi Province.ActaSedimentologica Sinica,15(3):110-114(in Chinese with Englishabstract)
Xue JY,Sun T,Zhang WLet al.2000.Some microstructures of coppersulfides in Dongxiang copper mine,Jiangxi Province,and theirgeological implications.Geological Journal of China Universities,6(2):149-155(in Chinese with English abstract)
Zhai YS and Yao SZ.1995.Cu-Au metallogenic series related tovolcanic-intrusive complex in eastern China.Journal of ChinaUniversity of Geosciences,6(1):107-113
Zhang GL.2001.Peel fault system of Dongxiang copper deposit and itsore-controlling significance.Mineral Resources and Geology,15(3):157-161(in Chinese with English abstract)
Zhou XM and Zhu YH.1992.Magmatic mixing of Jiangshan-Shaoxingfracture belt and related Precambrian geology.Science in China(Series B),22(3):298-303(in Chinese)
Zhu JC and Zhang CH.1981.On the occurrence of Carboniferousvolcanics and origin of the copper and tungsten deposits of theFenglin district,Dongxiang,Jiangxi.Journal of Nanjing University(Nat.Sci.Ed.),2:269-282(in Chinese with English abstract)
Zhu XT.2005.Research on geneses of Yongping and Dongxiang copperdeposit,Jiangxi Province.Master Degree Thesis.Nanjing:NanjingUniversity(in Chinese with English summary)
杜杨松,田世洪,李学军.2000.安徽铜陵天马山矿床与大团山矿床流体成矿作用对比研究.地球科学,25(4):433-437
付守会.2003.江西东乡铜矿成矿元素分布规律及构造成矿特征研究.硕士学位论文.广州:中国科学院广州地球化学研究所
付守会,陈广浩.2003.江西东乡铜矿成矿地质特征与找矿实践.大地构造与成矿学,27(3):282-286
顾连兴,徐克勤.1986.论大陆地壳断裂拗陷带中的华南型块状硫化物矿床.矿床地质,2:1-13
顾连兴,徐克勤.1987.长江中、下游断裂拗陷带的构造发展与成矿作用.桂林冶金地质学院学报,4:243-251
黄旭初,张祖廉.1979.江西东乡枫林石炭系火山岩.江西师院学报,1:41-50
李培铮,邓国萍,陶红.1999.赣东北壳体构造演化与铜(金)多金属成矿系.大地构造与成矿学,23(4):300-307
卢焕章,范宏瑞,倪培等.2004.流体包裹体.北京:科学出版社
倪培,田京辉,朱筱婷.2005.江西永平铜矿下盘网脉状矿化的流体包裹体研究.岩石学报,21(5):1339-1346
徐克勤.1980.论中国东南部几个断裂拗陷带中某些铁铜矿床的成因问题.国际交流地质学术论文集.北京:地质出版社
徐克勤.1982.地质科学与矿床学.世界科学,6:1-4
徐克勤,王鹤年,周建平,朱金初.1996.论华南喷流-沉积块状硫化物矿床.高校地质学报,2(3):241-257
徐跃通.1994.钱塘江-信江地区块状硫化物矿床大地构造背景、硅质岩特征与成矿机制.博士学位论文.南京:南京大学,1-171
徐跃通.1997.江西东乡矿区沉积硅质岩的地球化学特征和成因.沉积学报,15(3):110-114
薛纪越,孙涛,张文兰等.2000.江西东乡铜矿中含铜硫化物的几种微结构及其地质意义.高校地质学报,6(2):149-155
张国林.2001.东乡铜矿剥离断层系统及其控矿意义.矿产与地质,15(3):157-161
周新民,朱云鹤.1992.江绍断裂带的岩浆混合作用及其两侧的前寒武纪地质.中国科学(B辑),22(3):298-303
朱金初,张承华.1981.江西东乡枫林石炭纪火山岩及铜-钨矿床的成因,南京大学学报,2:269-282
朱筱婷.2005.江西永平、东乡铜矿成因研究.硕士学位论文.南京:南京大学
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