北祁连金矿区花岗闪长斑岩年代学及地质意义
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摘要
松树南沟金矿床是北祁连造山带中段大坂山成矿带内的一个中型金矿床。金矿体主要赋存于肉红色花岗闪长斑岩及其接触带附近的玄武安山岩中。通过对该花岗闪长斑岩的年代学研究,探讨了成岩与成矿的关系及岩石形成的构造环境。该花岗闪长斑岩中锆石LA-MC-ICP-MS U-Pb加权平均年龄为442±1 Ma,MSWD=0.32,属早志留世,成矿与花岗闪长斑岩具有密切的时空关系。综合分析认为,松树南沟金矿成岩成矿作用发生于北祁连洋向南侧中祁连陆块俯冲的构造环境,具有斑岩型矿床的特征。该研究对在该区进一步找矿具有重要意义。
The Songshunangou Au deposit is a medium-sized porphyry one in the Dabanshan metallogenic belt,North Qilian Mountains.The Au ore bodies generally occur in granodiorite porphyry and its contact with basaltic andesite.This paper has a discussion on relationship between magmatism and ore-formation based geological features of the deposit and zircon U–Pb dating of the host granodiorite porphyry.The granodiorite porphyry yields zircon U–Pb age values of 442 ± 1 Ma(MSWD = 0.32) of Early Silurian.The Au deposit was emplaced in the tectonic setting of subduction from the North Qilian Ocean to the Middle Qilian continental block.
The Songshunangou Au deposit is a medium-sized porphyry one in the Dabanshan metallogenic belt,North Qilian Mountains.The Au ore bodies generally occur in granodiorite porphyry and its contact with basaltic andesite.This paper has a discussion on relationship between magmatism and ore-formation based geological features of the deposit and zircon U–Pb dating of the host granodiorite porphyry.The granodiorite porphyry yields zircon U–Pb age values of 442 ± 1 Ma(MSWD = 0.32) of Early Silurian.The Au deposit was emplaced in the tectonic setting of subduction from the North Qilian Ocean to the Middle Qilian continental block.
引文
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[4]刘青松,袁万明,冯星,等.青海省祁连县山阴凹槽海相火山岩型锌铜矿床地球化学特征及其成因意义[J].西北地质,2017,50(4):105-114.
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[13]Sillitoe R H.2000.Gold-rich porphyry copper deposits:descriptive and genetic models and their role in exploration and discovery.In:Hagemann S G.,Brown P E(eds).Gold in 2000.Society of Economic Geologists Reviews in Economic Geology,13:315-344.
[14]李金祥,李光明,秦克章,肖波.班工湖带多不杂富金斑岩铜矿床斑岩-火山岩的地球化学特征与时代:对成矿构造背景的制约[J].岩石学报,2008.24(3):531-543.
[15]耿建珍,李怀坤,张健,周紅英,李惠民.锆石Hf同位素组成的LA-MC-ICP-MS测定[J].地质通报,2011.30(10):1508-1513.
[16]伊有昌,陈树云,文雪峰.青海北祁连松树南沟造山型金矿床地质特征及矿床成因[J].黄金,2006.10(27):16-19.
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[19]Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q and Wang D B.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb Dating,Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths.Journal of Petrology,51(1-2):537-571.
[20]Ludwig K R.2003.User’s Manual for Isoplot 3.00:A geochronological toolkit for Microsoft Excel.Berkeley Geochronology Center,Special Publication,4:70.
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[12]Hoskin P W O and Schaltegger U.2003.The composition of zircon and igneous and metamorphic petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62.
[23]Lee J K W,Willians L S and Ellis D J.1997.Pb,U and Th diffusion in natural zircon.Nature,390:159-161.
[24]左国朝,刘寄陈.北祁连早古生代大地构造演化[J].地质科学,1987.1:15-24.
[25]夏林圻,夏祖春,徐学义.北祁连山构造-火山岩浆演化动力学[J].西北地质科学,1995.16(1):1-28.
[26]葛肖虹,刘俊来.北祁连造山带的形成与背景[J].地学前缘,1999.6(4):223-230.
[27]李世金.祁连造山带地球动力学演化与内生金属矿产成矿作用研究[D].长春:吉林大学.2011.
[28]宋述光.北祁连山古大洋俯冲带高压变质岩研究评述[J].地质通报,2009.28(12):1769-1778.
[29]Song S G..2009.High-pressure metamorphic rocks in the North Qilian oceanic subduction zone,China:A review.Geological Bulletin of China,28(12):1769-1778(in Chinese with English abstract).
[30]吴才来,姚尚志,杨经绥,曾令森,陈松永,李海兵,戚学祥,Joseph L,Wooden,Frank K,Mazadab.北祁连洋早古生带双向俯冲的花岗岩证据[J].中国地质,2006.33(6):1197-1208.
[31]Wu C L,Gao Y,Frost B R,et al.2009.An early Palaeozoic double-subduction model for the North Qilian oceanic plate:evidence from zircon SHRIMP dating of granites.International Geology Review,2:1-25.
[32]林宜慧,张立飞,季建清,等.北祁连山九个泉硬柱石蓝片岩40Ar-39Ar年龄及其地质意义[J].科学通报,2010.55(17):1710-1716.
[33]Lin Y H,Zhang L F,Ji J Q,Wang Q J and Song S G.2010.40Ar-39Ar isochron ages of lawsonite blueschists from Nine Spring in the Northern Qilian Mountains,NW China,and their tectonic implications.Chinese Sci Bull,55,(17):1710-1716(in Chinese with English abstract).
[34]熊子良,张宏飞,张杰.北祁连东段冷龙岭地区毛藏寺岩体和黄羊河岩体的岩石成因及其构造意义[J].地学前缘,2012.19(3):214-227.
[35]Xiong Z L,Zhang H F and Zhang J.2012.Petrogenesis and tectonic implications of the Maozangsi and Huangyanghe granitic intrusions in Lenglongling area,the eastern part of North Qilian Mountains,NW China.Earth Science Frontiers,19(3):214-227.
[36]Mao J W,Zhang Z Z,Lehmann B,et al.2000.The Yeniutan granodiorite in Subei County,Gansu Province,China:petrological features,geological setting and relationship to tungsten mineralization.Episodes,23(3):163-171.
[2]郑振华,谢海林,吴鸿梅.青海省祁连县阴凹槽锌铜矿床成因[J].青海大学学报(自然科学版),2012.,30(3):63-68.
[3]郭彦汝,王瑾.北祁连尕大坂黑矿型矿床特征及形成环境[J].西北地质,2014,(2):191-197.
[4]刘青松,袁万明,冯星,等.青海省祁连县山阴凹槽海相火山岩型锌铜矿床地球化学特征及其成因意义[J].西北地质,2017,50(4):105-114.
[5]毛景文,张作衡,张招崇,杨建民,王志良.北祁连山西段塔儿沟夕卡岩型-石英脉型钨矿床[J].矿床地质,1998,17(增刊):543-548.
[6]张作衡,毛景文,杨建民,张招崇,等.甘肃小柳沟石英脉型钨矿床成矿流体地球化学研究[J].地球学报,1999.20(增刊):292-297.
[7]赵辛敏,张作衡,刘敏,等.北祁连西段小柳沟矿区花岗质岩石锆石U-Pb年代学、地球化学及成因研究[J].岩石学报,2014.30(1):16-34.
[8]郭周平,赵辛敏,白赟,等.北祁连浪力克铜矿床锆石U-Pb和辉钼矿Re-Os年龄及其地质意义[J].中国地质,2015,42(3):691-701.
[9]青海有色地质公司第七地质勘探队.青海省门源县松树南沟金矿床详查报告[R].1988.
[10]肖晓林,陈岑.青海松树南沟金矿矿床地质特征[J].地质与勘探,2010.46(2):191-197.
[11]王冠,肖晓林,刘强,等..松树南沟金矿区玄武安山岩锆石U-Pb年代学地球化学及其动力学意义[J].四川地质学报,201737(3):375-382.
[12]Wang G,Xiao X L,Liu Q,Zhong S X,wang D K,Fu H C,Liu Z,Wu X P and Zhang H.2017.Zircon U-Pb age and geochemistry of basaltic andesite from the Songshunangou Au deposit and their geodynamic implication.Acta geologica Sichuan,37(3):375-382(in Chinese with English abstract).
[13]Sillitoe R H.2000.Gold-rich porphyry copper deposits:descriptive and genetic models and their role in exploration and discovery.In:Hagemann S G.,Brown P E(eds).Gold in 2000.Society of Economic Geologists Reviews in Economic Geology,13:315-344.
[14]李金祥,李光明,秦克章,肖波.班工湖带多不杂富金斑岩铜矿床斑岩-火山岩的地球化学特征与时代:对成矿构造背景的制约[J].岩石学报,2008.24(3):531-543.
[15]耿建珍,李怀坤,张健,周紅英,李惠民.锆石Hf同位素组成的LA-MC-ICP-MS测定[J].地质通报,2011.30(10):1508-1513.
[16]伊有昌,陈树云,文雪峰.青海北祁连松树南沟造山型金矿床地质特征及矿床成因[J].黄金,2006.10(27):16-19.
[17]Andersen T.2002.Correction of common lead in U-Pb analyses that do not report204Pb.Chemical Geology,192(1-2):59-79.
[18]Liu Y S,Hu Z C,Gao S,Detlef Günther,Xu J,Gao C G and Chen H H.2008.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard.Chemical Geology,257(1-2):34-43.
[19]Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q and Wang D B.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb Dating,Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths.Journal of Petrology,51(1-2):537-571.
[20]Ludwig K R.2003.User’s Manual for Isoplot 3.00:A geochronological toolkit for Microsoft Excel.Berkeley Geochronology Center,Special Publication,4:70.
[21]Belousova E A,Griffin W L,O’Reilly S Y and Fisher N I.2002.Igneous zircon:Trace element composition as an indicator of source rock type.Contributions to Mineralogy and Petrology,143(5):602-622.
[12]Hoskin P W O and Schaltegger U.2003.The composition of zircon and igneous and metamorphic petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62.
[23]Lee J K W,Willians L S and Ellis D J.1997.Pb,U and Th diffusion in natural zircon.Nature,390:159-161.
[24]左国朝,刘寄陈.北祁连早古生代大地构造演化[J].地质科学,1987.1:15-24.
[25]夏林圻,夏祖春,徐学义.北祁连山构造-火山岩浆演化动力学[J].西北地质科学,1995.16(1):1-28.
[26]葛肖虹,刘俊来.北祁连造山带的形成与背景[J].地学前缘,1999.6(4):223-230.
[27]李世金.祁连造山带地球动力学演化与内生金属矿产成矿作用研究[D].长春:吉林大学.2011.
[28]宋述光.北祁连山古大洋俯冲带高压变质岩研究评述[J].地质通报,2009.28(12):1769-1778.
[29]Song S G..2009.High-pressure metamorphic rocks in the North Qilian oceanic subduction zone,China:A review.Geological Bulletin of China,28(12):1769-1778(in Chinese with English abstract).
[30]吴才来,姚尚志,杨经绥,曾令森,陈松永,李海兵,戚学祥,Joseph L,Wooden,Frank K,Mazadab.北祁连洋早古生带双向俯冲的花岗岩证据[J].中国地质,2006.33(6):1197-1208.
[31]Wu C L,Gao Y,Frost B R,et al.2009.An early Palaeozoic double-subduction model for the North Qilian oceanic plate:evidence from zircon SHRIMP dating of granites.International Geology Review,2:1-25.
[32]林宜慧,张立飞,季建清,等.北祁连山九个泉硬柱石蓝片岩40Ar-39Ar年龄及其地质意义[J].科学通报,2010.55(17):1710-1716.
[33]Lin Y H,Zhang L F,Ji J Q,Wang Q J and Song S G.2010.40Ar-39Ar isochron ages of lawsonite blueschists from Nine Spring in the Northern Qilian Mountains,NW China,and their tectonic implications.Chinese Sci Bull,55,(17):1710-1716(in Chinese with English abstract).
[34]熊子良,张宏飞,张杰.北祁连东段冷龙岭地区毛藏寺岩体和黄羊河岩体的岩石成因及其构造意义[J].地学前缘,2012.19(3):214-227.
[35]Xiong Z L,Zhang H F and Zhang J.2012.Petrogenesis and tectonic implications of the Maozangsi and Huangyanghe granitic intrusions in Lenglongling area,the eastern part of North Qilian Mountains,NW China.Earth Science Frontiers,19(3):214-227.
[36]Mao J W,Zhang Z Z,Lehmann B,et al.2000.The Yeniutan granodiorite in Subei County,Gansu Province,China:petrological features,geological setting and relationship to tungsten mineralization.Episodes,23(3):163-171.