吉林临江地区草山花岗岩体中黑云母成分特征及其成岩成矿意义
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摘要
草山花岗岩为八里沟金矿成矿岩体。笔者利用电子探针对草山花岗岩体中黑云母化学成分进行研究,以此来探讨岩浆成因及成矿潜力。研究表明草山花岗岩中的黑云母为岩浆成因的镁质黑云母,具有富Al、K、Mg、Ti,低Na、Ca的特征。以22个氧原子为基础计算了黑云母的阳离子数及相关参数,其全铝(~TAl)、镁质率(Mg~#)较高。利用黑云母化学成分对岩体固结的温度、压力、侵位深度及氧逸度进行了估算。岩石固结时的温度为750℃~780℃,固结压力范围为131.77~143.89 MPa,侵位深度为5.0~5.4 km,氧逸度f(O_2)=10~(-13)~10~(-14);由此得出其为中等深度、高温、高氧逸度岩体。黑云母化学成分特征暗示岩石为I型花岗岩,岩浆是在太平洋板块向华北板块俯冲、地壳加厚的背景下,由壳、幔物质混熔而形成。草山花岗岩固结时温度、氧逸度较高,有利于Au进入岩浆期后成矿流体中,表明八里沟金矿潜力较大。
Caoshan granite is the ore-forming rock mass of Baligou gold deposit.The authors studied the chemical composition of Caoshan biotites in the rock mass by electron microprobe,to understand the magma genesis and metallogenic potential.Results show that biotites from the Caoshan granite mass are magmatic magnesian biotites with high contents of Al,K,Mg and Ti,but low contents of Na and Ca.Based on 22 oxygen atoms,the number of cation and relevant parameters of the biotites are calculated,demonstrating high total aluminum(~TAl)and magnesian rate(Mg~#).The temperature,pressure,emplacement depth and oxygen fugacity of rock mass consolidation are estimated according to the chemical composition of biotites.Solidification temperature of rock is 750°C~780℃,solidification pressure is 131.77~143.89 MPa,depth of emplacement is 5.0~5.4 km,and oxygen fugacity f(O_2)is 10~(-13)~10~(-14),indicating that the rock mass formed under medium depth,high temperature,and high oxygen fugacity.The chemical characteristics of biotites indicate that the rock is a type I granite.The magma is formed by the fusion of the crust and mantle material under the background that the Pacific Plate subducted toward the North China Plate and the crust was thickened.The high solidification temperature and oxygen fugacity of Caoshan granite are favorable for the Au element to get into post-magmatic ore-forming fluid,indicating good mineralization potential in the Baligou gold deposit.
Caoshan granite is the ore-forming rock mass of Baligou gold deposit.The authors studied the chemical composition of Caoshan biotites in the rock mass by electron microprobe,to understand the magma genesis and metallogenic potential.Results show that biotites from the Caoshan granite mass are magmatic magnesian biotites with high contents of Al,K,Mg and Ti,but low contents of Na and Ca.Based on 22 oxygen atoms,the number of cation and relevant parameters of the biotites are calculated,demonstrating high total aluminum(~TAl)and magnesian rate(Mg~#).The temperature,pressure,emplacement depth and oxygen fugacity of rock mass consolidation are estimated according to the chemical composition of biotites.Solidification temperature of rock is 750°C~780℃,solidification pressure is 131.77~143.89 MPa,depth of emplacement is 5.0~5.4 km,and oxygen fugacity f(O_2)is 10~(-13)~10~(-14),indicating that the rock mass formed under medium depth,high temperature,and high oxygen fugacity.The chemical characteristics of biotites indicate that the rock is a type I granite.The magma is formed by the fusion of the crust and mantle material under the background that the Pacific Plate subducted toward the North China Plate and the crust was thickened.The high solidification temperature and oxygen fugacity of Caoshan granite are favorable for the Au element to get into post-magmatic ore-forming fluid,indicating good mineralization potential in the Baligou gold deposit.
引文
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[9]林文蔚,彭丽君.由电子探针分析数据估算角闪石、黑云母中的Fe3+、Fe2+[J].长春地质学院学报,1994,24(2):155-162.LIN Wen-wei,PENG Li-jun.The estimation of Fe3+and Fe2+contents in amphibole and biotite from EMPA Data[J].Journal of Changchun University of Earth Sciences,1994,24(2):155-162.
[10]Stone D.Temperature and pressure variations in suites of Archean felsic plutonic rocks,Berens River area,northwest Superior Province,Ontario,Canada[J].Canadian Mineralogist,2000,38(2):455-470.
[11]马昌前,杨坤光,唐仲华,等.花岗岩类岩浆动力学:理论方法及鄂东花岗岩类例析[M].武汉:中国地质大学出版社,1994:210-212.MA Chang-qian,YANG Kun-guang,TANG Zhonghua,et al.Magma-dynamics granitoids:theory,methods and a case study of the eastern Hubei granitoids[M].Wuhan:China University of Geosciences Press,1994:210-212.
[12]Foster M D.Interpretation of the composition of trioctahedral micas[J].US Geological Surey Professional Paper,1960,354B:11-49.
[13]Uchdia E,Endo S,Mitsutoshi M.Relationship between solidification depth of granitic rocks and formation of hydrothermal ore deposits[J].Resource Geology,2007,57(1):47-56.
[14]杨阳,王晓霞,于晓卫,等.胶西北中生代花岗岩中黑云母和角闪石成分特征及成岩成矿意义[J].岩石学报,2017,33(10):3123-3136.YANG Yang,WANG Xiao-xia,YU Xiao-wei,et al.Chemical composition of biotite and amphibole from Mesozoic granites in northwestern Jiaodong Peninsula,China,and their implications[J].Acta Petrologica Sinica,2017,33(10):3123-3136.
[15]Ayer J A.The mafic minerals of the Falcon Island ultrapotassic pluton,Lake of the Woods,Ontario:progressive reduction during fractionation[J].Canadian Mineralogist,1998,36(1):49-66.
[16]Henry D J,Guidotti C V,Thomson J A.The Ti-saturation surface for low-to-medium pressure metapelitic biotites:implications for geothermometry and Ti-substitution mechanisms[J].American Mineralogist,2005,90(2/3):316-328.
[17]Buddington A F,Lindsley D H.Iron-titanium oxide minerals and synthetic equivalents[J].Journal of Petrology,1964:5(2):310-357.
[18]Albuquerque,Carlos C A R D.Geochemistry of biotites from granitic rocks,northern Portugal[J].Geochimica Et Cosmochimica Acta,1973,37(7):1779-1802.
[19]Abdelrahman A M.Nature of biotites from alkaline,calc-alkaline,and peraluminous magmas[J].Journal of Petrology,1994,35(2):1025-1029.
[20]丁孝石.西藏中南部花岗岩类中云母矿物标型特征及其地质意义[C]//中国地质科学院矿床地质研究所文集,1988:33-50.DING Xiao-shi.Study of typomorphic characteristics of micas from grantioids in Central-Southern Xizang and their geological significance[C]//Bulletin of the Institute of Mineral Depostis Chinese Academy of Geological Sciences,1988:33-50.
[21]杨文金,王联魁,张绍立,等.华南两个不同成因系列花岗岩的云母标型特征[J].矿物学报,1986,6(4):298-307.YANG Wen-jin,WANG Lian-kui,ZHANG Shao-li,et al.Micas of the two series of granites in South China[J].Acta Mineralogica Sinica,1986,6(4):298-307.
[22]周作侠.湖北丰山洞岩体成因探讨[J].岩石学报,1986,2(1):61-72.ZHOU Zuo-xia.The origin of intrusive mass in Fengshandong,Hubei Province[J].Acta Petrologica Sinica,1986,2(1):61-72.
[23]陈光远,孙岱生,周珣若,等.胶东郭家岭花岗闪长岩成因矿物学与金矿化[M].武汉:中国地质大学出版社,1993:1-131.CHEN Guang-yuan,SUN Dai-sheng,ZHOU Xun-ruo,et al.Genetic mineralogy and gold mineralization of Guojialing granodiorite in Jiaodong region[M].Wuhan:China University of Geosciences Press,1993:1-131.
[24]洪大卫.华南花岗岩的黑云母和矿物相及其与矿化系列的关系[J].地质学报,1982,5(2):149-164.HONG Da-wei.Biotites and mineralogical facies from granitic rocks of South China and their relation to the series of mineralization[J].Acta Geologica Sinica,1982,5(2):149-164.
[25]Gong Q,Deng J,Wang C,et al.Element behaviors due to rock weathering and its implication to geochemical anomaly recognition:a case study on Linglong biotite granite in Jiaodong Peninsula,China[J].Journal of Geochemical Exploration,2013,128:14-24.
[26]Wang R C,Xie L,Chen J,et al.Tin-carrier minerals in metaluminous granites of the western Nanling Range(southern China):constraints on processes of tin mineralization in oxidized granites[J].Journal of Asian Earth Sciences,2013,74(18):361-372.
[27]Li D,Zhang S T,Yan C H,et al.Late Mesozoic time constraints on tectonic changes of the Luanchuan Mo belt,East Qinling orogen,central China[J].Journal of Geodynamics,2012,61(5):94-104.
[2]李鸿莉,毕献武,涂光炽,等.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,2007,27(3):49-54.LI Hong-li,BI Xian-wu,TU Guang-chi,et al.Mineral chemistry of biotite from Yanbei pluton:implication for Sn-metallogeny[J].Journal of Mineralogy and Petrology,2007,27(3):49-54.
[3]Wones D R,Eugster H P.Stability of biotite:experiment,theory,and application[J].American Mineralogist,1965,50(9):1228-1272.
[4]Kesler S E,Issgonis M J,Brownlow A H,et al.Geochemistry of biotites from mineralized and barren intrusive systems[J].Economic Geology,1975,70(3):559-567.
[5]AbdelRahman A M.Nature of biotites from alkaline,calc-alkaline,and peralumious magmas[J].Journal of Petrology,1994,35(2):525-541.
[6]陈慧军,张寿庭,曹华文,等.滇西古永地区花岗岩中黑云母成分特征及其成岩成矿意义[J].矿物学报,2015,35(2):267-275.CHEN Hui-jun,ZHANG Shou-ting,CAO Hua-wen,et al.Compositional characteristics,petrogenesis and metallogenic significance of biotite from granite in the Guyong region of western Yunnan Province,China[J].Acta Mineralogica Sinica,2015,35(2):267-275.
[7]刘洪文,邢树文,周永昶.吉南地区斑岩-热液脉型金多金属矿床成矿模式[J].地质与勘探,2002,38(2):28-32.LIU Hong-wen,XING Shu-wen,ZHOU Yong-chang.The metallogenic model of the porphyry-hydrothermal goldmultiple metallogenic deposits in South Jilin Province[J].Geology and Prospecting,2002,38(2):28-32.
[8]王诗元,范继璋,王淼,等.吉林老岭成矿带金矿综合信息找矿模型[J].吉林大学学报(地球科学版),2008,38(2):211-216.WANG Shi-yuan,FAN Ji-zhang,WANG Miao,et al.The ore-prospecting model of gold deposits in the Laoling metallegenic belt[J].Journal of Jilin University(Earth Science Edition),2008,38(2):211-216.
[9]林文蔚,彭丽君.由电子探针分析数据估算角闪石、黑云母中的Fe3+、Fe2+[J].长春地质学院学报,1994,24(2):155-162.LIN Wen-wei,PENG Li-jun.The estimation of Fe3+and Fe2+contents in amphibole and biotite from EMPA Data[J].Journal of Changchun University of Earth Sciences,1994,24(2):155-162.
[10]Stone D.Temperature and pressure variations in suites of Archean felsic plutonic rocks,Berens River area,northwest Superior Province,Ontario,Canada[J].Canadian Mineralogist,2000,38(2):455-470.
[11]马昌前,杨坤光,唐仲华,等.花岗岩类岩浆动力学:理论方法及鄂东花岗岩类例析[M].武汉:中国地质大学出版社,1994:210-212.MA Chang-qian,YANG Kun-guang,TANG Zhonghua,et al.Magma-dynamics granitoids:theory,methods and a case study of the eastern Hubei granitoids[M].Wuhan:China University of Geosciences Press,1994:210-212.
[12]Foster M D.Interpretation of the composition of trioctahedral micas[J].US Geological Surey Professional Paper,1960,354B:11-49.
[13]Uchdia E,Endo S,Mitsutoshi M.Relationship between solidification depth of granitic rocks and formation of hydrothermal ore deposits[J].Resource Geology,2007,57(1):47-56.
[14]杨阳,王晓霞,于晓卫,等.胶西北中生代花岗岩中黑云母和角闪石成分特征及成岩成矿意义[J].岩石学报,2017,33(10):3123-3136.YANG Yang,WANG Xiao-xia,YU Xiao-wei,et al.Chemical composition of biotite and amphibole from Mesozoic granites in northwestern Jiaodong Peninsula,China,and their implications[J].Acta Petrologica Sinica,2017,33(10):3123-3136.
[15]Ayer J A.The mafic minerals of the Falcon Island ultrapotassic pluton,Lake of the Woods,Ontario:progressive reduction during fractionation[J].Canadian Mineralogist,1998,36(1):49-66.
[16]Henry D J,Guidotti C V,Thomson J A.The Ti-saturation surface for low-to-medium pressure metapelitic biotites:implications for geothermometry and Ti-substitution mechanisms[J].American Mineralogist,2005,90(2/3):316-328.
[17]Buddington A F,Lindsley D H.Iron-titanium oxide minerals and synthetic equivalents[J].Journal of Petrology,1964:5(2):310-357.
[18]Albuquerque,Carlos C A R D.Geochemistry of biotites from granitic rocks,northern Portugal[J].Geochimica Et Cosmochimica Acta,1973,37(7):1779-1802.
[19]Abdelrahman A M.Nature of biotites from alkaline,calc-alkaline,and peraluminous magmas[J].Journal of Petrology,1994,35(2):1025-1029.
[20]丁孝石.西藏中南部花岗岩类中云母矿物标型特征及其地质意义[C]//中国地质科学院矿床地质研究所文集,1988:33-50.DING Xiao-shi.Study of typomorphic characteristics of micas from grantioids in Central-Southern Xizang and their geological significance[C]//Bulletin of the Institute of Mineral Depostis Chinese Academy of Geological Sciences,1988:33-50.
[21]杨文金,王联魁,张绍立,等.华南两个不同成因系列花岗岩的云母标型特征[J].矿物学报,1986,6(4):298-307.YANG Wen-jin,WANG Lian-kui,ZHANG Shao-li,et al.Micas of the two series of granites in South China[J].Acta Mineralogica Sinica,1986,6(4):298-307.
[22]周作侠.湖北丰山洞岩体成因探讨[J].岩石学报,1986,2(1):61-72.ZHOU Zuo-xia.The origin of intrusive mass in Fengshandong,Hubei Province[J].Acta Petrologica Sinica,1986,2(1):61-72.
[23]陈光远,孙岱生,周珣若,等.胶东郭家岭花岗闪长岩成因矿物学与金矿化[M].武汉:中国地质大学出版社,1993:1-131.CHEN Guang-yuan,SUN Dai-sheng,ZHOU Xun-ruo,et al.Genetic mineralogy and gold mineralization of Guojialing granodiorite in Jiaodong region[M].Wuhan:China University of Geosciences Press,1993:1-131.
[24]洪大卫.华南花岗岩的黑云母和矿物相及其与矿化系列的关系[J].地质学报,1982,5(2):149-164.HONG Da-wei.Biotites and mineralogical facies from granitic rocks of South China and their relation to the series of mineralization[J].Acta Geologica Sinica,1982,5(2):149-164.
[25]Gong Q,Deng J,Wang C,et al.Element behaviors due to rock weathering and its implication to geochemical anomaly recognition:a case study on Linglong biotite granite in Jiaodong Peninsula,China[J].Journal of Geochemical Exploration,2013,128:14-24.
[26]Wang R C,Xie L,Chen J,et al.Tin-carrier minerals in metaluminous granites of the western Nanling Range(southern China):constraints on processes of tin mineralization in oxidized granites[J].Journal of Asian Earth Sciences,2013,74(18):361-372.
[27]Li D,Zhang S T,Yan C H,et al.Late Mesozoic time constraints on tectonic changes of the Luanchuan Mo belt,East Qinling orogen,central China[J].Journal of Geodynamics,2012,61(5):94-104.