内蒙古浩尧尔忽洞高钾钙碱性花岗岩岩石成因及构造意义
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摘要
浩尧尔忽洞金矿为低品位超大型中低温热液型金矿,矿区内华力西期花岗岩发育。SiO2含量为71.5%~73.07%,Na2O/K2O值为0.59~0.67,平均值为0.64,属于高钾钙碱性系列。哈克图解上各元素含量随SiO2变化成线性规律明显,具I型花岗岩特征。Mg#为39~49,其平均值为43,与下地壳麻粒岩的平均值(45.36)相近。∑REE值变化范围为72.64×10-6~132.6×10-6,总体上稀土含量较低。(La/Yb)N值为12.99~34.13,显示轻重稀土有较大的分馏。在稀土元素蛛网图上表现为右倾。Ba/Th值为133.93~178.93,认为板片俯冲流体影响较小。δEu含量为0.52~0.96,平均值为0.75,具有中等到低的Eu亏损。根据其地球化学特征,认为该岩体为后碰撞期形成的高钾钙碱性I型花岗岩。
Hercynian granite is found developed in Haoyao′erhudong gold deposit,a low-intermediatehydrothermal deposit with low-grade ultra-large reserves.Analysis on the granite has shown that the ratio of SiO2ranges from 71.5%to 73.07%,and the ratio of Na2O/K2O ranges from 0.59to 0.67with an average value of 0.64,thus the granite belongs to high-K calcalkaline series.According to Hark diagram,the content of each element is obviously in line with the variation tendency of SiO2,to express the characteristics of I-type granite.The content of Mg#ranges from 39to 49,and its average of 43is similar to the average value(45.36)of lower crust granulite.The value of∑REE from 72.64×10-6 to 132.6×10-6 signifies a low content of rare earth.The ratio of(La/Yb)N ranges from 12.99to 34.13,revealing biggish fractionation between LREE and HREE.The distribution curve on REE spider chart goes right.The ratio of Ba/Th ranges from 133.93to 178.93,indicating less influence on the underthrust plate.The content ofδEu varies from 0.52to 0.96,with an average of 0.75,indicating negative Eu anomaly from interm ediate to a low er level.A ccording to som e other geochem ical features,it is considered that the ore body is high-K Calc-alkaline I-type granite formed in post-collision environment.
Hercynian granite is found developed in Haoyao′erhudong gold deposit,a low-intermediatehydrothermal deposit with low-grade ultra-large reserves.Analysis on the granite has shown that the ratio of SiO2ranges from 71.5%to 73.07%,and the ratio of Na2O/K2O ranges from 0.59to 0.67with an average value of 0.64,thus the granite belongs to high-K calcalkaline series.According to Hark diagram,the content of each element is obviously in line with the variation tendency of SiO2,to express the characteristics of I-type granite.The content of Mg#ranges from 39to 49,and its average of 43is similar to the average value(45.36)of lower crust granulite.The value of∑REE from 72.64×10-6 to 132.6×10-6 signifies a low content of rare earth.The ratio of(La/Yb)N ranges from 12.99to 34.13,revealing biggish fractionation between LREE and HREE.The distribution curve on REE spider chart goes right.The ratio of Ba/Th ranges from 133.93to 178.93,indicating less influence on the underthrust plate.The content ofδEu varies from 0.52to 0.96,with an average of 0.75,indicating negative Eu anomaly from interm ediate to a low er level.A ccording to som e other geochem ical features,it is considered that the ore body is high-K Calc-alkaline I-type granite formed in post-collision environment.
引文
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汪传胜,顾连兴,张遵忠,等.东天山哈尔里克山区二叠纪高钾钙碱性花岗岩成因及地质意义[J].岩石学报,2009,25(6):1499-1511.Wang CS,Gu LX,Zhang ZZ,et al.Petrogenesis and geological implications of the Permian high-K talc-alkaline granites in Harlik Mountains of eastern Tianshan,NW China[J].Acta Petrologica Sinica,2009,25(6):1499-1511.
翁望飞,支利庚,蔡连友,等.皖南中生代高钾钙碱性埃达克岩地球化学特征及岩石成因[J].地质调查与研究,2011,2(35):98-107.Weng Wangfei,Zhi Ligeng,Cai Lianyou,et al.Geochemical Characteristics and Petrogenesis of the Mesozoic Adakite in South Anhui Province[J].Geological Survery and Research,2011,2(35):98-107.
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崔盛芹.华北陆块北缘构造运动序列及区域构造格局[M].北京:地质出版社,2000,179-183.Cui Sheng-qin.northern margin of north china landmass sequence tectonic movement and regional structure pattern[M].Geological Publishing House,Beijing:2000:179-183.
胡桂明,王守伦.华北陆台北缘地体构造与铁金矿产[M].北京:地质出版社,1998,50-56.Hu Guiming,Wang Shoulun.Northern Margin of North China Landmass Terrane Tectonics and Gold Mineral[M].Geological Publishing House,Beijing,1998:50-56.
张栋,路彦明,潘爱军,等.东准噶尔北缘两类钙碱性花岗岩特征及其构造-成矿意义[J].西北地质,2011,2(44):51-71.Zhang Dong,Lu Yanming,Pan Aijun,et al.Two Types of Calcium Alkaline Granite and Their Tectonic-Metallogenic Significance in North Margin of Eastern Junggar[J].Northwestern Geology,2011,2(44):51-71.
罗红玲,吴泰然,李毅.乌拉特中旗克布岩体的地球化学特征SHRIMP定年:早二叠世华北克拉通底侵作用的证据[J].岩石学报,2007,23(4):755-766.Luo H L,Wu T R,Li Y.Geochemistry and SHRIMP dating of the Kehu massif from Wulatezhongqi,Inner Mongolia evidence for the Early Permian underplating beneath the North China Craton[J].Acta Petrologica Sinica,2007,23(4):755-766.
Castillo PR.An overview of adakite petrogenesis[J].Chinese Science Bulletin,2006,51:257-268.
Zhang Cheng-li,Liu Liang,Zhang Guo-wei,Determination of Neoproterozoic post-collisional granites in the north QinlingMountains and its tectonic significance.Earth Science Frontier[J].2004,3(11):33-42.
Rick P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].lithos.1989,22:247-263.
Devine J D.Petrogenesis of the basalt-andesite-dacite association of Grenada,Lesser Antilles island arc,revisited[J].Journal of Volcanology and Geothermal Research.1995,69(1-2):1-33.
Altherr R,Holl A,Hegner E,et al.High2potassium,calc2alkaline I-type plutonism in the European Variscides:north2ern Vosges(France)and northern Schwarzwald(Germany)[J].Lithos,2000,50:51-73.
Dada S S,Briqueu L,Harms U,et al.Charnockitic and monzonitic Pan-African series from north-central Nigeria:trace-element and Nd,Sr,Pb isotope constraints on their Petrogenesis[J].Chemical Geology(Isotope Geoscience Section),1995,124:233-252.
Zhong H,Zhu Wg Hu RZ,et al.Zircon U-Pb age and SrNd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province,southwest China and implication for growth of iuvenile crust[J].Lithos,2009,110:109-128.
Chappell BW.Aluminium saturation in I-and S-type granites and the characterization of fractionated haplogranites.Lithos,1999,46:535-551.
Li XH,Li ZX,LI WX,et al.U-Pb zircon,geochemical and Sr-Nd-Hf isotopic constraints on age and China:A major igneous event in response to foundering of a subducted flat-slab[J].Lithos,2007,96:186-204.
Zartman R E,Doe B R.Plumbotectonics:the model[J].Tectonophysics,1981,75(1/2):135-162.
王玉峰.内蒙古浩尧尔忽洞金矿区岩体地球化学特征及其成矿意义[D].北京:中国地质大学地球科学与资源学院,2012:30-40.Wang Yu-feng.The Geochemical Charateristics and Its’Ore-forming Significance of the Pluton in the Haoyaoerhudong Gold Deposit of Inner Mongolia[D].China University of Geosciences Earth science and resources institute,Beijing,2012:30-40.
赵百胜,刘家军,王建平,等.内蒙古长山壕金矿矿床地球化学特征与成因研究[J].现代地质,2012,25(6):1077-1086.Zhao Baisheng,Liu Jiajun,Wang Jianping,et al.Geological-Geochemical Characteristics and Genesis of Changshanhao Gold Deposit in Inner Mongolia China[J].Geoscience,2012,25(6):1077-1086.
肖伟,聂凤军,刘翼飞,等.内蒙古长山壕金矿区花岗岩同位素年代学研究及地质意义.岩石学报,2012,28(2):535-543.Xiao W,Nie FJ,Liu YF,et al.Isotope geochronology study of the granitoid intrusions in the Changshanhao gold deposit and its geological implications[J].Acta Petrologica Sinica,2012,28(2):535-543.
王建平,刘家军,江向东,等.内蒙古浩尧尔忽洞金矿床黑云母氩氩年龄及其地质意义[J].矿物学报,2011(增刊):643-644.Wang jianping,Liu Jiajun,Jiang Xiangdong,et al.Haoyaoerhudong Gold Deposit Black Mica Argon Argon Age and Geological Significance[J].Mineral Journal2011(sup.):2011,643-644.
肖荣阁,彭润民,王美娟,等.华北地台北缘西段主要成矿系统分析[J].地球科学-中国地质大学学报,2000,25(4):362-368.Xiao Rongge,Peng Runmin,Wang Meijuan,et al.Analysis of Major Metallogenic Systems in Western Section,Northern Margin of North China Platform[J].Earth Science-Journal of China University of Geoscience,2000,25(4):362-368.
汪传胜,顾连兴,张遵忠,等.东天山哈尔里克山区二叠纪高钾钙碱性花岗岩成因及地质意义[J].岩石学报,2009,25(6):1499-1511.Wang CS,Gu LX,Zhang ZZ,et al.Petrogenesis and geological implications of the Permian high-K talc-alkaline granites in Harlik Mountains of eastern Tianshan,NW China[J].Acta Petrologica Sinica,2009,25(6):1499-1511.
翁望飞,支利庚,蔡连友,等.皖南中生代高钾钙碱性埃达克岩地球化学特征及岩石成因[J].地质调查与研究,2011,2(35):98-107.Weng Wangfei,Zhi Ligeng,Cai Lianyou,et al.Geochemical Characteristics and Petrogenesis of the Mesozoic Adakite in South Anhui Province[J].Geological Survery and Research,2011,2(35):98-107.
杨理华,李钦祖.华北地区地壳应力场[M].北京:地震出版社,1980,39-41.Yang Lihua,Li Qinghua.Crustal stress field in north China[M].Earthquake Publishing House,Beijing,1980:39-41.
崔盛芹.华北陆块北缘构造运动序列及区域构造格局[M].北京:地质出版社,2000,179-183.Cui Sheng-qin.northern margin of north china landmass sequence tectonic movement and regional structure pattern[M].Geological Publishing House,Beijing:2000:179-183.
胡桂明,王守伦.华北陆台北缘地体构造与铁金矿产[M].北京:地质出版社,1998,50-56.Hu Guiming,Wang Shoulun.Northern Margin of North China Landmass Terrane Tectonics and Gold Mineral[M].Geological Publishing House,Beijing,1998:50-56.
张栋,路彦明,潘爱军,等.东准噶尔北缘两类钙碱性花岗岩特征及其构造-成矿意义[J].西北地质,2011,2(44):51-71.Zhang Dong,Lu Yanming,Pan Aijun,et al.Two Types of Calcium Alkaline Granite and Their Tectonic-Metallogenic Significance in North Margin of Eastern Junggar[J].Northwestern Geology,2011,2(44):51-71.
罗红玲,吴泰然,李毅.乌拉特中旗克布岩体的地球化学特征SHRIMP定年:早二叠世华北克拉通底侵作用的证据[J].岩石学报,2007,23(4):755-766.Luo H L,Wu T R,Li Y.Geochemistry and SHRIMP dating of the Kehu massif from Wulatezhongqi,Inner Mongolia evidence for the Early Permian underplating beneath the North China Craton[J].Acta Petrologica Sinica,2007,23(4):755-766.
Castillo PR.An overview of adakite petrogenesis[J].Chinese Science Bulletin,2006,51:257-268.
Zhang Cheng-li,Liu Liang,Zhang Guo-wei,Determination of Neoproterozoic post-collisional granites in the north QinlingMountains and its tectonic significance.Earth Science Frontier[J].2004,3(11):33-42.
Rick P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].lithos.1989,22:247-263.
Devine J D.Petrogenesis of the basalt-andesite-dacite association of Grenada,Lesser Antilles island arc,revisited[J].Journal of Volcanology and Geothermal Research.1995,69(1-2):1-33.
Altherr R,Holl A,Hegner E,et al.High2potassium,calc2alkaline I-type plutonism in the European Variscides:north2ern Vosges(France)and northern Schwarzwald(Germany)[J].Lithos,2000,50:51-73.
Dada S S,Briqueu L,Harms U,et al.Charnockitic and monzonitic Pan-African series from north-central Nigeria:trace-element and Nd,Sr,Pb isotope constraints on their Petrogenesis[J].Chemical Geology(Isotope Geoscience Section),1995,124:233-252.
Zhong H,Zhu Wg Hu RZ,et al.Zircon U-Pb age and SrNd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province,southwest China and implication for growth of iuvenile crust[J].Lithos,2009,110:109-128.
Chappell BW.Aluminium saturation in I-and S-type granites and the characterization of fractionated haplogranites.Lithos,1999,46:535-551.
Li XH,Li ZX,LI WX,et al.U-Pb zircon,geochemical and Sr-Nd-Hf isotopic constraints on age and China:A major igneous event in response to foundering of a subducted flat-slab[J].Lithos,2007,96:186-204.
Zartman R E,Doe B R.Plumbotectonics:the model[J].Tectonophysics,1981,75(1/2):135-162.