江西岩背锡矿床流体包裹体特征与成矿作用研究
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摘要
岩背锡矿床位于武夷山南段江西会昌县境内,是一个大型独立斑岩锡矿床。矿床产于花岗斑岩和流纹斑岩的接触带内,矿体以富含原生黄玉为特征。矿石构造以浸染状、细脉浸染状和脉状为主。矿石矿物主要有锡石、黄铁矿、黄铜矿和辉钼矿等;脉石矿物主要有石英、黄玉、萤石、绿泥石、绢云母等。对岩背锡矿各阶段石英流体包裹体进行了岩相学观察、显微测温和激光拉曼探针分析。结果表明,流体包裹体的类型主要为富液相气液两相包裹体,其次为富气相气液两相包裹体、含CO2三相包裹体和含石盐子矿物多相包裹体。成矿前期和成矿后期以富液相气液两相包裹体为主,均一温度分别为228~433℃、147~195℃,w(NaCleq)分别为4.34%~17.26%、1.91%~6.3%。成矿期4类包裹体均发育,以富液相气液两相包裹体为主,均一温度为180~349℃,w(NaCleq)为3.87%~15.47%。激光拉曼分析显示,流体包裹体的气相成分主要是H2O、CO2、SO2、HCl和HF。已有的氢、氧同位素研究表明,成矿流体主要来自岩浆水,晚期有大气降水的混入。矿床的初始流体来源于岩浆水,低温度、低盐度大气水的混入,导致流体温度、盐度降低和锡石的沉淀。
Located in Wuyi Mountain within Huichang county of Jiangxi Province,the Yanbei tin deposit with rich original topaz is a large-sized tin deposit in the study area.Its major tin orebodies are mainly hosted in the contact zones of granite porphyry and rhyolitic porphyry.The ore mainly has disseminated,veinlet-disseminated and nervation.Ore minerals consist simply of cassiterite,pyrite,chalcopyrite,molybdenite etc;gangue minerals are mainly quartz,topaz,fluorite,chlorite,sericite etc;and the ores occur in disseminated and veinlet forms.Fluid inclusions in quartz from Yanbei tin deposit were studied by such means as petrography,microthermometry and Laser Raman Spectrometer analysis.Some conclusions have been reached through results:there are mainly liquid rich two-phase vapor-liquid inclusions,gas rich two-phase vapor-liquid inclusions,CO2-bearing three-phase inclusions and minor daughter minerals-bearing polyphase inclusions.Fluid inclusions in quartz in the pre-ore stage and post-ore stage are mainly liquid rich two-phase vapor-liquid inclusions.The homogenization temperatures and salinities of the former stage vary from 228~433℃ and from 4.34%~17.26% respectively,and those of the latter stage vary from 147~195℃ and from 1.91%~6.3% respectively.During the minerali-zation stage,all the four types of fluid inclusions were formed in ores,their homogenization temperatures and salinities range from 180~349℃ and from 3.87%~15.47% respectively.The analytic results through Laser Raman Spectroscopy suggest that the fluids are rich in H2O,CO2,SO2,HCl and HF.According to previously analyses of the isotopic composition of hydrogen and oxygen of the ores,it was suggested that the ore-forming fluid was mainly derived from the magmatic water and meteoric water mixing in the later.Combined with previous researches on Yanbei tin deposit,this paper maintains that the ore-forming fluid derived from magmatic water,meteoric water mixed in the later,resulted in the fell of temperature and salinities of the fluid,and made the deposition of cassiterite.
Located in Wuyi Mountain within Huichang county of Jiangxi Province,the Yanbei tin deposit with rich original topaz is a large-sized tin deposit in the study area.Its major tin orebodies are mainly hosted in the contact zones of granite porphyry and rhyolitic porphyry.The ore mainly has disseminated,veinlet-disseminated and nervation.Ore minerals consist simply of cassiterite,pyrite,chalcopyrite,molybdenite etc;gangue minerals are mainly quartz,topaz,fluorite,chlorite,sericite etc;and the ores occur in disseminated and veinlet forms.Fluid inclusions in quartz from Yanbei tin deposit were studied by such means as petrography,microthermometry and Laser Raman Spectrometer analysis.Some conclusions have been reached through results:there are mainly liquid rich two-phase vapor-liquid inclusions,gas rich two-phase vapor-liquid inclusions,CO2-bearing three-phase inclusions and minor daughter minerals-bearing polyphase inclusions.Fluid inclusions in quartz in the pre-ore stage and post-ore stage are mainly liquid rich two-phase vapor-liquid inclusions.The homogenization temperatures and salinities of the former stage vary from 228~433℃ and from 4.34%~17.26% respectively,and those of the latter stage vary from 147~195℃ and from 1.91%~6.3% respectively.During the minerali-zation stage,all the four types of fluid inclusions were formed in ores,their homogenization temperatures and salinities range from 180~349℃ and from 3.87%~15.47% respectively.The analytic results through Laser Raman Spectroscopy suggest that the fluids are rich in H2O,CO2,SO2,HCl and HF.According to previously analyses of the isotopic composition of hydrogen and oxygen of the ores,it was suggested that the ore-forming fluid was mainly derived from the magmatic water and meteoric water mixing in the later.Combined with previous researches on Yanbei tin deposit,this paper maintains that the ore-forming fluid derived from magmatic water,meteoric water mixed in the later,resulted in the fell of temperature and salinities of the fluid,and made the deposition of cassiterite.
引文
范蔚茗,王岳军,郭峰,彭头平.2003.赣南地区中生代镁铁质岩浆作用与岩石圈伸展[J].地学前缘,10(3):159-169.
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刘斌,段光贤.1987.NaCl-H2O溶液包裹体的密度式和等容式及其应用[J].矿物学报,7:345-352.
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刘昌实,沈渭洲,熊小林,王德滋.1994.江西岩背斑岩锡矿区火山侵入杂岩稀土元素特征和成岩模拟[J].岩石矿物学杂志,13(3):193-203.
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毛景文,华仁民,李晓波.1999.试论大规模成矿作用与大型矿集区[J].矿床地质,18(4):291-299.
毛景文,谢桂青,郭春丽,陈毓川.2007.南岭地区大规模钨锡多金属成矿作用:成矿时限及地球动力学背景[J].岩石学报,23(10):2329-2338.
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梅勇文.1994.会昌岩背斑岩锡矿床蚀变特征与成矿关系[J].江西地质,8(1):6-13.
梅玉萍,李华芹,王登红,路远发,杨红梅,许建祥,张家菁.2007.江西岩背斑岩锡矿的成岩成矿时代及其地质意义[J].地球学报,28(5):456-461.
邵洁莲.1988.金矿找矿矿物学[M].北京:中国地质大学出版社.1-158.
沈渭洲,王德滋,刘昌实,熊小林,赖鸣远.1996.岩背斑岩锡矿特征和成因[J].高校地质学报,2(1):85-91.
唐维新,赵赣.1997.岩背矿床成矿地质条件及构造复合控岩控矿特征[J].江西地质科技,24(4):151-158.
万天丰.1993.中国东部中、新生代板内变形,构造应力场及其应用[M].北京:中国地质出版社.1-103.
万天丰,朱鸿.2002.中国大陆及邻区中生代—新生代大地构造与环境变迁[J].现代地质,16(2):107-120.
熊小林,朱金初,刘昌实,沈渭洲.1994.江西岩背斑岩锡矿蚀变分带及其主要蚀变岩的地球化学特征[J].矿床地质,13(1):1-10.
朱正书.1990.江西会昌岩背锡矿床地质特征及矿床类型的划分[J].矿床地质,9(4):325-331.
Hall D L,Sterner S Mand Bodnar RJ.1988.Freezing point depressionof NaCl-KCl-H2Osolutions[J].Econ.Geol.,83:197-202.
Heinrich C A.1990.The chemistry of hydrothermal tin(-tungsten)oredeposition[J].Econ.Geol.,85:457-481.
Maruyama S and Seno T.1986.Orogeny and relative plate motion:Example of the Japanese Islands[J].Tectonophysics,127:305-329.
Moore G M.1989.Mesozoic and Cenozoic paleographic development ofthe Pacific region[M].Abstract,28thIGC(2),Washington D C,USA:GAS Press,455-456.
Roedder E.1984.Fluidinclusions.Reviewsin mineralogy[J].Mineral.Soc.Amer.,12:1-664.
Taylor J Rand Wall VJ.1993.Cassiterite solubility,tinspeciation,andtransport in a magmatic aqueous phase[J].Econ.Geol.,(88):437-460.
Wilson G A.1986.Cassiterite solubility and metal-choride speciation insupercritical solutions[D].PhD thesis,John Hopkins University,Balti more,Maryland.
黄常立,唐维新,桂永年,王艳萍,叶景平,项常培.1997.会昌岩背式斑岩锡矿[M].武汉:中国地质大学出版社.1-95.
李鸿莉,毕献武,涂光炽,胡瑞忠,彭建堂,吴开业.2007.岩背花岗岩黑云母矿物化学研究及其对成矿意义的指示[J].矿物岩石,27(3):49-54.
刘斌,段光贤.1987.NaCl-H2O溶液包裹体的密度式和等容式及其应用[J].矿物学报,7:345-352.
刘斌,沈昆.1999.流体包裹体热力学[M].北京:地质出版社.1-290.
刘昌实,沈渭洲,熊小林,王德滋.1994.江西岩背斑岩锡矿区火山侵入杂岩稀土元素特征和成岩模拟[J].岩石矿物学杂志,13(3):193-203.
卢焕章,范宏瑞,倪培,欧光习,沈昆,张文淮.2004.流体包裹体[M].北京:科学出版社.1-487.
毛景文,华仁民,李晓波.1999.试论大规模成矿作用与大型矿集区[J].矿床地质,18(4):291-299.
毛景文,谢桂青,郭春丽,陈毓川.2007.南岭地区大规模钨锡多金属成矿作用:成矿时限及地球动力学背景[J].岩石学报,23(10):2329-2338.
毛景文,谢桂青,郭春丽,袁顺达,程彦博,陈毓川.2008.华南地区中生代主要金属矿床时空分布规律和成矿环境[J].高校地质学报,14(4):510-526.
梅勇文.1994.会昌岩背斑岩锡矿床蚀变特征与成矿关系[J].江西地质,8(1):6-13.
梅玉萍,李华芹,王登红,路远发,杨红梅,许建祥,张家菁.2007.江西岩背斑岩锡矿的成岩成矿时代及其地质意义[J].地球学报,28(5):456-461.
邵洁莲.1988.金矿找矿矿物学[M].北京:中国地质大学出版社.1-158.
沈渭洲,王德滋,刘昌实,熊小林,赖鸣远.1996.岩背斑岩锡矿特征和成因[J].高校地质学报,2(1):85-91.
唐维新,赵赣.1997.岩背矿床成矿地质条件及构造复合控岩控矿特征[J].江西地质科技,24(4):151-158.
万天丰.1993.中国东部中、新生代板内变形,构造应力场及其应用[M].北京:中国地质出版社.1-103.
万天丰,朱鸿.2002.中国大陆及邻区中生代—新生代大地构造与环境变迁[J].现代地质,16(2):107-120.
熊小林,朱金初,刘昌实,沈渭洲.1994.江西岩背斑岩锡矿蚀变分带及其主要蚀变岩的地球化学特征[J].矿床地质,13(1):1-10.
朱正书.1990.江西会昌岩背锡矿床地质特征及矿床类型的划分[J].矿床地质,9(4):325-331.
Hall D L,Sterner S Mand Bodnar RJ.1988.Freezing point depressionof NaCl-KCl-H2Osolutions[J].Econ.Geol.,83:197-202.
Heinrich C A.1990.The chemistry of hydrothermal tin(-tungsten)oredeposition[J].Econ.Geol.,85:457-481.
Maruyama S and Seno T.1986.Orogeny and relative plate motion:Example of the Japanese Islands[J].Tectonophysics,127:305-329.
Moore G M.1989.Mesozoic and Cenozoic paleographic development ofthe Pacific region[M].Abstract,28thIGC(2),Washington D C,USA:GAS Press,455-456.
Roedder E.1984.Fluidinclusions.Reviewsin mineralogy[J].Mineral.Soc.Amer.,12:1-664.
Taylor J Rand Wall VJ.1993.Cassiterite solubility,tinspeciation,andtransport in a magmatic aqueous phase[J].Econ.Geol.,(88):437-460.
Wilson G A.1986.Cassiterite solubility and metal-choride speciation insupercritical solutions[D].PhD thesis,John Hopkins University,Balti more,Maryland.
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