南祁连天峻巴龙贡嘎尔组变质火山岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及构造意义
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摘要
南祁连山天峻县一带巴龙贡嘎尔组发育大量变质火山岩,其形成时代及构造意义缺乏详细研究,时代归属存在争议。本文以变质火山岩为研究对象,开展岩石学、地球化学和年代学研究。本文在变质火山岩中获得LA-ICP-MS锆石U-Pb年龄为736±6Ma和740±14Ma,时代为新元古代。岩石为变玄武岩、变质石英粗面质凝灰岩和变质流纹质凝灰岩,其SiO_2含量为48.10%～53.01%和64.14%～71.83%,属于碱性和亚碱性系列,构成双峰式火山岩组合。玄武岩稀土总量为56.3×10~(-6)～98.9×10~(-6),轻、重稀土分馏中等,δEu为0.89～1.16具微弱异常,微量元素Rb、Ba、K、Sr、La、Ce、Zr、Th等富集,Nb、P、Ti、Y等微弱—中等亏损。变质石英粗面质凝灰岩和变质流纹质凝灰岩的A/CNK为0.8～1.14,具有偏铝质—过铝质特征,稀土总量为155.5×10~(-6)～265.6×10~(-6),轻、重稀土分馏中等—强烈,δEu为0.63～0.94,具有弱—微弱异常,微量元素Rb、K、Ba、La、Ce、Zr、Th等富集, Sr、Nb、P、Ti、Yb等中等—强烈亏损。区域资料、前人成果及本文研究表明巴龙贡嘎尔组形成于新元古代的陆内裂谷环境,是Rodinia超大陆裂解事件的响应。
Objectives: A large number of metamorphic volcanic rocks have been developed in the Balongonggaer Formation in the vicinity of Tianjun area,South Qilian Mountai. There is a lack of detailed study on the age and structural significance of rock formation.Methods: This paper takes metamorphic volcanic rocks as research objects and conducts petrology,geochemistry and chronology studies.Results: In this paper,LA-ICP-MS zircon U-Pb ages of 736±6 Ma and 740±14 Ma were obtained. The age was Neoproterozoic. The rock is metamorphic basalt,metamorphic quartz trachtie tuff and metamorphic rhyolite tuff. Its SiO_2 content is 48.10% ～ 53.01% and 64.14% ～ 71.83%,belonging to the alkaline and subalkaline series,forming a bimodal volcanic rock combination.The total amount of REE of basalt is 56.3×10~(-6)～ 98.9×10~(-6),light and heavy rare earth fractionation is medium,δEu is 0.89 ～ 1.16 with weak anomaly. The trace elements Rb,Ba,K,Sr,La,Ce,Zr,Th,etc. are enriched,and Nb,P,Ti,Y,etc.weak—medium losses.The A/CNK of metamorphic quartz trachtie tuff and metamorphic rhyolite tuff is 0.8 ～ 1.14,which has the characteristics of insufficient aluminum—excessive aluminum. The total amount of REE is 155.5×10~(-6)～ 265.6×10~(-6),light and heavy Rare earth fractionation medium—strong,δEu is 0.63 ～ 0.94,with weak—weak anomaly. Trace elements Rb,K,Ba,La,Ce,Zr,Th,etc.are enriched,Sr,Nb,P,Ti,Yb,etc.medium—strong losses.Conclusions: Regional data,previous achievements and research in this paper indicate that the Balongonggaer Formation formed in intracontinental rift environment at the Neoproterozoic,and it ' s response to the Rodinia supercontinental cleavage event.
Objectives: A large number of metamorphic volcanic rocks have been developed in the Balongonggaer Formation in the vicinity of Tianjun area,South Qilian Mountai. There is a lack of detailed study on the age and structural significance of rock formation.Methods: This paper takes metamorphic volcanic rocks as research objects and conducts petrology,geochemistry and chronology studies.Results: In this paper,LA-ICP-MS zircon U-Pb ages of 736±6 Ma and 740±14 Ma were obtained. The age was Neoproterozoic. The rock is metamorphic basalt,metamorphic quartz trachtie tuff and metamorphic rhyolite tuff. Its SiO_2 content is 48.10% ～ 53.01% and 64.14% ～ 71.83%,belonging to the alkaline and subalkaline series,forming a bimodal volcanic rock combination.The total amount of REE of basalt is 56.3×10~(-6)～ 98.9×10~(-6),light and heavy rare earth fractionation is medium,δEu is 0.89 ～ 1.16 with weak anomaly. The trace elements Rb,Ba,K,Sr,La,Ce,Zr,Th,etc. are enriched,and Nb,P,Ti,Y,etc.weak—medium losses.The A/CNK of metamorphic quartz trachtie tuff and metamorphic rhyolite tuff is 0.8 ～ 1.14,which has the characteristics of insufficient aluminum—excessive aluminum. The total amount of REE is 155.5×10~(-6)～ 265.6×10~(-6),light and heavy Rare earth fractionation medium—strong,δEu is 0.63 ～ 0.94,with weak—weak anomaly. Trace elements Rb,K,Ba,La,Ce,Zr,Th,etc.are enriched,Sr,Nb,P,Ti,Yb,etc.medium—strong losses.Conclusions: Regional data,previous achievements and research in this paper indicate that the Balongonggaer Formation formed in intracontinental rift environment at the Neoproterozoic,and it ' s response to the Rodinia supercontinental cleavage event.
引文
迟清华,鄢明才.2007.应用地球化学元素丰度数据手册.北京:地质出版社.
邓晋福,刘翠,冯艳芳,肖庆辉,狄永军,苏尚国,赵国春,段培新,戴蒙.2015.关于火成岩常用图解的正确使用:讨论与建议.地质论评,61(4):717～734.
邓晋福,罗照华,苏尚国,等.2004.岩石成因、构造环境与成矿作用.北京:地质出版社.
高建峰,陆建军,赖明远,林雨萍,濮巍.2003.岩石样品中微量元素的高分辨率等离子质谱分析.南京大学学报(自然科学版),39(6):844～850.
计波,余吉远,李向民,黄博涛,王磊南.2017.祁连党河南山地区巴龙贡噶尔组的解体与岩石地层单位厘定——来自岩石学与年代学的证据.地质通报,37(4):621～633.
牛广智,黄岗,邓昌生,徐岩,陈涛,季春,李文军.2016.青海省南祁连巴龙贡噶尔组变火山岩LA-ICP-MS锆石U-Pb年龄及地质意义.地质通报,35(9):1441～1447.
汤贺军,孟贵祥,杨岳清,邓震,严加永,祁光,薛融晖.2018.新疆东准噶尔恰库尔图地区二叠纪双峰式火山岩地质地球化学特征及构造意义.地质论评,64(6):1393～1412.
吴元宝,郑永飞.2004.锆石成因矿物学研究其对U-Pb年龄解释的制约.科学通报,49(16):1589～1604.
夏林圻,夏祖春,徐学义,赵江天,杨合群,赵东宏.1999.祁连山元古宙大陆溢流玄武岩.地质论评,45(增刊):1028～1037.
夏林圻,李向民,余吉远,王国强.2016.祁连山新元古代中—晚期至早古生代火山作用与构造演化.中国地质,43(4):1087～1138.
肖庆辉,邓晋福,马大铨,洪大卫,莫宣学,卢欣祥,李志昌,汪雄武,马昌前,吴福元,罗照华,王涛,等.2002.花岗岩研究思维与方法.北京:地质出版社.
肖庆辉,王涛,邓晋福,等.2009.中国典型造山带花岗岩与大陆地壳生长研究.北京:地质出版社.
Ayers J.1998.Trace element modeling of aqueous fluid—peridotite interaction in the mantle wedge of subduction zones.Contributions to Mineralogy and Petrology,132(4):390～404.
Boynton W V.1984.Geochemistry of rare earth elements:Meteorite studies.In:Henderson P.ed.Rare Earth Elements Geochemistry.Amsterdam:Elsevier,63～114.
Chi Qinghua,Yan Mingcai.2007&.Applied Geochemistry Abundance Databook.Beijing:Geological Pulishing House.
Deng Jinfu,Liu Cui,Feng Yanfang,Xiao Qinghui,Di Yongjun,Su Shangguo,Zhao Guochun,Duan Peixin,Dai Meng.2015&.On the correct application in the common igneous petrological diagrams:Discussion and suggestion.Geological Review,61(4):717～734.
Deng Jinfu,Luo Zhaohua,Su Shangguo,et al.2004&.Rock Formation,Tectonic Environment and Mineralization.Beijing:Geological Pulishing House.
Gao Jianfei,Lu Jianjun,Lai Mingyuan,Lin Yuping,Pu Wei.2003&.Determination of trace elenments in rock sample by high resolution plasma mass spectrometry.Journal of Nanjing University(Natural Sciences),39(6):844～850.
Hofmann A W.1988.Chemical differntitation of the Earth:The relationship between mantle,continental crust,and oceanic crust.Earth and Planetary Science Letters,90:297～314.
Irvine T N,Baragar W R A.1971.A guide to the chemical classification of the conmon volcanic rocks.Can.J.Earth Sci.:523～548.
Ji Bo,Yu Jiyuan,Li Xiangmin,Huang Botao,Wang Leinan.2017&.The disintegration of Balongonggaer’er Formation and the definition of lithostratigraphic unit in Danghenanshan area of South Qilian Mountain:Evidence from petrology and chronology.Geological Bulletin of China,37(4):621～633.
Lebas M J,Lemaitre R W,Strekeisen A and Zanettin B.1986.A chemical classification of volcanic rocks based on the total alkalisilica diagram.Journal of Petroloy,27(3):745～750.
Miyashiro.1974.Volcanic rock series in island arcs of lavas and active continental margins Am.J.Sci.,274:321～355.
Niu Guangzhi,Huang Gang,Deng Changsheng,Xu Yan,Chen Tao,Ji Chun,Li Wenjun.2016&.LA-ICP-MS Zircon U-Pb ages of metamorphosed volcanic rocks in Balongonggaer’er Formation of South Qilian Mountain in Qinghai Province and their geological significance.Geological Bulletin of China,35(9):1441～1447.
Rapp R P and Watson E B.1995.Dehydration melting of metabasalt at 8～32 kbar:Implications for continental growth and crust—mantle recycling.Journal of Petrology,36(4):891～931.
Rickwood P C.1989.Boundary lines within petrologic diagrams whichous oxides of major and minor elements.Lithos,22(4):247～263.
Ryerson F J and Watson E B.1987.Rutile saturrtion in magma:Implications for Ti—Nb—Ta depletion in island –arc basalts.Earth and Planetary Science Letters,86(2～4):225～239.
Smithies R H.2000.The Archaean tonalite—trondhjemite—granodiorite (TTG) series is not an analogue of Cenozonic adakite.Earth and Planetary Science Letters,182(1):115～125.
Sun S S,McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D and Norry M J.eds.Magmatism in Ocean Basins.Geological Society,London:Geological Society of Special Publication,42(1):313～345.
Tang Hejun,Meng Guixiang,Yang Yueqing,Deng Zhen,Yang Jiayong,Qi Guang,Xue Ronghui.2018&.Geological and geochemical features of the Permian bimodal volcanic rocks in the Qiakuetu area,eastern Junggar Basin,Xinjiang,and their tectonic significance.Geological Review,64(6):1393～1412.
Wu Yuanbao,Zheng Yongfei.2004#.Zircon geological mineralogical study of U-Pb age interpretation of constraints.Chinese Science Bulletin,49(16):1589～1604.
Xia Linqi,Xia Zuchun,Xu Xueyi,Zhao Jiangtian,Yang Hequn,Zhao Donghong.1999.Proterozoic continental flood basalts from Qilian Mountains.Geological Review,45(Supp.):1028～1037.
Xia Linqi,Li Xiangmin,Yu Jiyuan,Wang Guoqiang.2016&.Mid—Late Neoproterozoic to Early Paleozoic volcanism and tectonic evolution of the Qilian Mountains.Geology in China,43(4):1087～1138.
Xiao Qinghui,Deng Jinfu,Ma Daquan,Hong Dawei,Mo Xuanxue,Lu Xinxiang,Li Zhichang,Wang Xiongwu,Ma Changqian,Wu Fuyuan,Luo Zhaohua,Wang Tao,et al.2002&.The Ways of Investigation on Granitoids.Beijing:Geological Pulishing House.
Xiao Qinghui,Wang Tao,Deng Jinfu,et al.2009&.Study on Growth of Granite and Continental Crust in Typical Orogenic Belts in China.Beijing:Geological Pulishing House.
? 青海省地质调查院.2001.青海省天峻县那尔宗幅等四幅1∶5万区域地质调查报告.
? 河北省区域地质调查研究所.2015.青海省天峻县多尔丰等四幅1∶5万区域地质矿产调查报告.
? 河北省区域地质调查研究所.2015.青海省天峻县快尔玛等六幅1∶5万区域地质矿产调查报告.
邓晋福,刘翠,冯艳芳,肖庆辉,狄永军,苏尚国,赵国春,段培新,戴蒙.2015.关于火成岩常用图解的正确使用:讨论与建议.地质论评,61(4):717～734.
邓晋福,罗照华,苏尚国,等.2004.岩石成因、构造环境与成矿作用.北京:地质出版社.
高建峰,陆建军,赖明远,林雨萍,濮巍.2003.岩石样品中微量元素的高分辨率等离子质谱分析.南京大学学报(自然科学版),39(6):844～850.
计波,余吉远,李向民,黄博涛,王磊南.2017.祁连党河南山地区巴龙贡噶尔组的解体与岩石地层单位厘定——来自岩石学与年代学的证据.地质通报,37(4):621～633.
牛广智,黄岗,邓昌生,徐岩,陈涛,季春,李文军.2016.青海省南祁连巴龙贡噶尔组变火山岩LA-ICP-MS锆石U-Pb年龄及地质意义.地质通报,35(9):1441～1447.
汤贺军,孟贵祥,杨岳清,邓震,严加永,祁光,薛融晖.2018.新疆东准噶尔恰库尔图地区二叠纪双峰式火山岩地质地球化学特征及构造意义.地质论评,64(6):1393～1412.
吴元宝,郑永飞.2004.锆石成因矿物学研究其对U-Pb年龄解释的制约.科学通报,49(16):1589～1604.
夏林圻,夏祖春,徐学义,赵江天,杨合群,赵东宏.1999.祁连山元古宙大陆溢流玄武岩.地质论评,45(增刊):1028～1037.
夏林圻,李向民,余吉远,王国强.2016.祁连山新元古代中—晚期至早古生代火山作用与构造演化.中国地质,43(4):1087～1138.
肖庆辉,邓晋福,马大铨,洪大卫,莫宣学,卢欣祥,李志昌,汪雄武,马昌前,吴福元,罗照华,王涛,等.2002.花岗岩研究思维与方法.北京:地质出版社.
肖庆辉,王涛,邓晋福,等.2009.中国典型造山带花岗岩与大陆地壳生长研究.北京:地质出版社.
Ayers J.1998.Trace element modeling of aqueous fluid—peridotite interaction in the mantle wedge of subduction zones.Contributions to Mineralogy and Petrology,132(4):390～404.
Boynton W V.1984.Geochemistry of rare earth elements:Meteorite studies.In:Henderson P.ed.Rare Earth Elements Geochemistry.Amsterdam:Elsevier,63～114.
Chi Qinghua,Yan Mingcai.2007&.Applied Geochemistry Abundance Databook.Beijing:Geological Pulishing House.
Deng Jinfu,Liu Cui,Feng Yanfang,Xiao Qinghui,Di Yongjun,Su Shangguo,Zhao Guochun,Duan Peixin,Dai Meng.2015&.On the correct application in the common igneous petrological diagrams:Discussion and suggestion.Geological Review,61(4):717～734.
Deng Jinfu,Luo Zhaohua,Su Shangguo,et al.2004&.Rock Formation,Tectonic Environment and Mineralization.Beijing:Geological Pulishing House.
Gao Jianfei,Lu Jianjun,Lai Mingyuan,Lin Yuping,Pu Wei.2003&.Determination of trace elenments in rock sample by high resolution plasma mass spectrometry.Journal of Nanjing University(Natural Sciences),39(6):844～850.
Hofmann A W.1988.Chemical differntitation of the Earth:The relationship between mantle,continental crust,and oceanic crust.Earth and Planetary Science Letters,90:297～314.
Irvine T N,Baragar W R A.1971.A guide to the chemical classification of the conmon volcanic rocks.Can.J.Earth Sci.:523～548.
Ji Bo,Yu Jiyuan,Li Xiangmin,Huang Botao,Wang Leinan.2017&.The disintegration of Balongonggaer’er Formation and the definition of lithostratigraphic unit in Danghenanshan area of South Qilian Mountain:Evidence from petrology and chronology.Geological Bulletin of China,37(4):621～633.
Lebas M J,Lemaitre R W,Strekeisen A and Zanettin B.1986.A chemical classification of volcanic rocks based on the total alkalisilica diagram.Journal of Petroloy,27(3):745～750.
Miyashiro.1974.Volcanic rock series in island arcs of lavas and active continental margins Am.J.Sci.,274:321～355.
Niu Guangzhi,Huang Gang,Deng Changsheng,Xu Yan,Chen Tao,Ji Chun,Li Wenjun.2016&.LA-ICP-MS Zircon U-Pb ages of metamorphosed volcanic rocks in Balongonggaer’er Formation of South Qilian Mountain in Qinghai Province and their geological significance.Geological Bulletin of China,35(9):1441～1447.
Rapp R P and Watson E B.1995.Dehydration melting of metabasalt at 8～32 kbar:Implications for continental growth and crust—mantle recycling.Journal of Petrology,36(4):891～931.
Rickwood P C.1989.Boundary lines within petrologic diagrams whichous oxides of major and minor elements.Lithos,22(4):247～263.
Ryerson F J and Watson E B.1987.Rutile saturrtion in magma:Implications for Ti—Nb—Ta depletion in island –arc basalts.Earth and Planetary Science Letters,86(2～4):225～239.
Smithies R H.2000.The Archaean tonalite—trondhjemite—granodiorite (TTG) series is not an analogue of Cenozonic adakite.Earth and Planetary Science Letters,182(1):115～125.
Sun S S,McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D and Norry M J.eds.Magmatism in Ocean Basins.Geological Society,London:Geological Society of Special Publication,42(1):313～345.
Tang Hejun,Meng Guixiang,Yang Yueqing,Deng Zhen,Yang Jiayong,Qi Guang,Xue Ronghui.2018&.Geological and geochemical features of the Permian bimodal volcanic rocks in the Qiakuetu area,eastern Junggar Basin,Xinjiang,and their tectonic significance.Geological Review,64(6):1393～1412.
Wu Yuanbao,Zheng Yongfei.2004#.Zircon geological mineralogical study of U-Pb age interpretation of constraints.Chinese Science Bulletin,49(16):1589～1604.
Xia Linqi,Xia Zuchun,Xu Xueyi,Zhao Jiangtian,Yang Hequn,Zhao Donghong.1999.Proterozoic continental flood basalts from Qilian Mountains.Geological Review,45(Supp.):1028～1037.
Xia Linqi,Li Xiangmin,Yu Jiyuan,Wang Guoqiang.2016&.Mid—Late Neoproterozoic to Early Paleozoic volcanism and tectonic evolution of the Qilian Mountains.Geology in China,43(4):1087～1138.
Xiao Qinghui,Deng Jinfu,Ma Daquan,Hong Dawei,Mo Xuanxue,Lu Xinxiang,Li Zhichang,Wang Xiongwu,Ma Changqian,Wu Fuyuan,Luo Zhaohua,Wang Tao,et al.2002&.The Ways of Investigation on Granitoids.Beijing:Geological Pulishing House.
Xiao Qinghui,Wang Tao,Deng Jinfu,et al.2009&.Study on Growth of Granite and Continental Crust in Typical Orogenic Belts in China.Beijing:Geological Pulishing House.
? 青海省地质调查院.2001.青海省天峻县那尔宗幅等四幅1∶5万区域地质调查报告.
? 河北省区域地质调查研究所.2015.青海省天峻县多尔丰等四幅1∶5万区域地质矿产调查报告.
? 河北省区域地质调查研究所.2015.青海省天峻县快尔玛等六幅1∶5万区域地质矿产调查报告.
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