内蒙古索伦山地区哈尔博格托尔TTG岩锆石年代学、岩石地球化学及大地构造意义
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摘要
内蒙古索伦山地区是中亚造山带构造演化的关键区域,其中关于古亚洲洋的闭合时限以及西伯利亚板块和华北板块的拼贴时空关系一直存在争议。出露于内蒙古索伦山地区哈尔博格托尔的中酸性侵入岩,其深入研究对探讨古亚洲洋演化具有重要意义。文中对内蒙古索伦山地区哈尔博格托尔TTG岩进行了系统的岩石学、年代学及地球化学研究。获得哈尔博格托尔TTG岩的LA-ICP-MS锆石U-Pb年龄为(266.7±3.7)Ma,表明该侵入岩形成于中二叠世。地球化学主量元素分析表明,索伦山地区哈尔博格托尔TTG岩的岩石系列主要为含钠较高的钙碱性准铝质系列。其稀土元素总量较低,呈现轻稀土元素(LREEs)相对于重稀土元素(HREEs)弱富集的特征,Eu异常不明显;微量元素呈现Rb、Ba、Th、U等大离子亲石元素富集,Nb、Ta、Ti等高场强元素强烈亏损的特征,与典型的岛弧岩浆岩类似。结合索伦山TTG岩体地质特征和区域地质背景,综合年代学和地球化学特征分析,笔者认为索伦山地区哈尔博格托尔TTG岩体形成于岛弧环境,即中二叠世期间古亚洲洋壳向华北板块还存在俯冲作用,因而古亚洲洋至少应在中二叠世以后才闭合。内蒙古索伦山地区哈尔博格托尔TTG岩是洋壳俯冲的岩石学记录,为索伦山缝合带及古亚洲洋构造域演化提供了新的基础地质资料。
The Solonker zone,Inner Mongolia is a key area in the evolution of the Central Asia Orogenic Belt(CAOB).It lies at the center of an ongoing debate on the Paleo-Asian Ocean closure time and temporospatial relationship between the North China and Siberian Plates.It is therefore essential to study in-depth the intermedia-acid intrusive rock of this region.In this work,we carried out a systematic investigation on the petrology,chronology and geochemistry of the Haer Bogetuoer TTG rock.LA-ICP-MS zircon U-Pb age dating 266.7±3.7 Ma indicated the TTG rock from Solonker was emplaced during the middle Permian.Geochemical analysis of major elements showed that the lithological series belonged to the high-sodium calcalkali and metaluminous rock series.The overall content of rare-earth elements(REEs)was low in the TTG rock,with light REEs slightly enriched without apparent Eu anomaly.Rock samples were enriched in large ionic lithophile elements including Rb,Ba,Th and U,and extremely depleted in high field strength elements such as Nb,Ta and Ti.These geochemical characteristics are similar to that of typical magmatite in an island arc setting.Integrating geological,tectonic,chronologic and geochemical characteristics of the TTG rock,we conclude that the TTG rock complex from Solonker formed in an island arc setting,and the subduction of the Paleo-Asian Ocean plate beneath the North China plate continued during the middle Permain,implying the Paleo-Asian Ocean did not close until the middle Permain.The Haer Bogetuoer TTG from the Solonker zone,Inner Mongolia serves as petrological record of ocean crust underthrusting.Our study provides new geological insight into the evolution of the Solonker suture zone and Paleo-Asian Ocean tectonic domain.
The Solonker zone,Inner Mongolia is a key area in the evolution of the Central Asia Orogenic Belt(CAOB).It lies at the center of an ongoing debate on the Paleo-Asian Ocean closure time and temporospatial relationship between the North China and Siberian Plates.It is therefore essential to study in-depth the intermedia-acid intrusive rock of this region.In this work,we carried out a systematic investigation on the petrology,chronology and geochemistry of the Haer Bogetuoer TTG rock.LA-ICP-MS zircon U-Pb age dating 266.7±3.7 Ma indicated the TTG rock from Solonker was emplaced during the middle Permian.Geochemical analysis of major elements showed that the lithological series belonged to the high-sodium calcalkali and metaluminous rock series.The overall content of rare-earth elements(REEs)was low in the TTG rock,with light REEs slightly enriched without apparent Eu anomaly.Rock samples were enriched in large ionic lithophile elements including Rb,Ba,Th and U,and extremely depleted in high field strength elements such as Nb,Ta and Ti.These geochemical characteristics are similar to that of typical magmatite in an island arc setting.Integrating geological,tectonic,chronologic and geochemical characteristics of the TTG rock,we conclude that the TTG rock complex from Solonker formed in an island arc setting,and the subduction of the Paleo-Asian Ocean plate beneath the North China plate continued during the middle Permain,implying the Paleo-Asian Ocean did not close until the middle Permain.The Haer Bogetuoer TTG from the Solonker zone,Inner Mongolia serves as petrological record of ocean crust underthrusting.Our study provides new geological insight into the evolution of the Solonker suture zone and Paleo-Asian Ocean tectonic domain.
引文
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[21]ZHANG S H,ZHAO Y,KRONER A,et al.Early Permian plutons from the northern North China Block:constraints on continental arc evolution and convergent margin magmatism related to the Central Asian Orogenic Belt[J].International China Science Journal,2009,98(6):1441-1467.
[22]JACKSON S E,PEARSON N J,GRIFFIN W L,et al.The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chemical Geology,2011(1/2):47-69.
[23]李钢柱,薄海军,刘永新,等.内蒙古自治区乌拉特中旗索伦山地区扎嘎乌苏幅、浩仁呼都格幅、哈日格那幅、索伦幅、沙布特幅、乌珠尔少布特幅等六幅1∶5万区域地质矿产调查报告[R].呼和浩特:武警黄金第二支队,2016.
[24]ANDERSON D J,HUYVAERT K P,APANIUS V,et al.Population size and trends of the Waved Albatross Phoebastria irrorata[J].Marine Ornithology,2002,30(2):63-69.
[25]LUDWIG K R.Squid 1.02:a user’s manual[M].Berkeley:Berkeley Geochronology Centre,Special Publication,2001:1-19.
[26]SUN S S,MCDOUGH W F,SAUNDERS A D,et al.Chemical and isotopic systematic of oceanic basalts:implications for mantle composition and processes:magmatism in ocean basins[J].Geological Society,Special Publications,1989,42:313-345.
[27]薛建平,苏尚国,李成元,等.内蒙古索伦山地区蛇绿岩岩石单元地质特征、就位机制及时限[J].现代地质,2017,31(3):498-507.
[28]RICKWOOD P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].Lithosphere,1989,22(4):247-263.
[29]LE MAITRE R W,STRECKEISEN A,ZANETTIN B,et al.Igneous rocks:a classification and glossary of terms[M].2nd ed.Cambridge:Cambridge University Press,2002:196-215.
[30]BARKER F.Trondhjemites,dacites,and related rocks(developments in petrology)[M].Amsterdam:Elsevier,1979:1-12.
[31]BARKER F,ARTH J G.Generation of trondhjemitic-tonalitic liquids and Archean bimodal trondhjemite-basalt suites[J].Geology,1976,4(10),596-600.
[32]ANDERS E,GREVESSE N.Abundances of the elements:meteoritic and solar[J].Geochemical et Cosmochimica Acta,1989,53(1):197-214.
[33]冯艳芳,邓晋福,肖庆辉,等.TTG岩类的识别:讨论与建议[J].高校地质学报,2011,17(3):406-414.
[34]邓晋福,刘翠,冯艳芳,等.关于火成岩常用图解的正确使用:讨论与建议[J].地质论评,2015,61(4):717-734.
[35]PEATE D W,PEARCE J A,HAWKESWORTH C J,et al.Geochemical variations in vanuatu arc lavas:the role of subducted material and a variable mantal wedge composition[J].Journal of Petrology,1997,38(10):1331-1358.
[36]MARSKE K A,LESCHEN R A,BUCKLEY T R.Reconciling phylogeography and ecological niche models for New Zealand beetles:looking beyond glacial refugia[J].Molecular Phylogenetics and Evolution,2011,59(1):89-102.
[37]PEARCE J A.Source and settings of granitic rocks[J].Episodes,1996,19(4):120-125.
[38]MUELLER D.Plate tectonics and crustal evolution[M].New York:Pergamon Press,1976:421-422.
[39]PITCHER W S.Granite type and tectonic environment[C]∥HSU K J.Mountain building processes.London:London Press,1982:19-40.
[40]PITCHER W S.The nature and origin of granite[M].London:Champman&Hall,1997:288-294.
[41]CONDIE K C,BENN K.Archean geodynamics:similar to different from Modern geodynamics?[J].Geophysical Monograph Series,American Geophysical Union,2006,164(5):47-59.
[42]邓晋福,罗照华,苏尚国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004:102-117.
[43]JOHANNES W,HOLTZ F.Petrogensis and experimental Petrology of granitic rocks[M].Berlin:Springer,1996:335.
[44]RAPP R P,WATSON E B.Dehydration melting of metabasalt at 8-32kbar:implications for continental growth and crust-mantle recycling[J].Journal of Petrology,1995,36(4):891-931.
[45]DRUMMOND M S,DEFANT M J,KEPEZHINSKAS P K.Petrosenesis of slab-derived trondhjemite-TTG-dacite/adakite magmas[J].Transactions of the Society Edinburgh,Earth Sciences,1996,87(1/2):205-215.
[46]邓晋福,肖庆辉,苏尚国,等.火成岩组合与构造环境:讨论[J].高校地质学报,2007,13(3):392-402.
[47]LE MAITRE R W.火成岩分类及术语辞典[M].王碧香,译.北京:地质出版社,1991.
[48]MANIAR P D,PICCOLI P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
[49]童英,洪大卫,王涛,等.中蒙边境中段花岗岩时空分布特征及构造和找矿意义[J].地球学报,2010,31(3):395-412.
[2]SENGOR A M C,NATAL’IN B A,BURTMAN V S.Evolution of the Altaid tectonic collage and Paleozoic crustal growth in Eurasia[J].Nature,1993,364:299-307.
[3]李大鹏,陈岳龙,王忠,等.内蒙古中-东部兴蒙造山带古生代沉积记录:对物源特征及中亚造山带构造演化的指示[J].科学通报,2012,57(7):550-559.
[4]DOBRETSOV N L,BERZIN N A,BUSLOV M M.Opening and tectonic evolution of the Paleo-Asian ocean[J].International Geological Review,1995,37(4):335-360.
[5]WINDLEY B F,ALEXEIEV D,XIAO W J,et al.Tectonic models for accretion of the Central Asian Orogenic Belt[J].Journal of the Geological Society of London,2007,164(1):31-47.
[6]LI D P,CHEN Y L,WANG Z,et al.Detrital zircon U-Pb ages,Hf isotopes and tectonic implications for Paleozoic sedimentary rocks from the Xing-Meng Orogenic Belt,Middle-East Part of Inner Mongolia,China[J].Geological Journal,2011,46(1):63-81.
[7]LI Y L,ZHOU H W,BROUWER F M,et al.Tectonic significance of the Xilin Gol complex,Inner Mongolia,China:petrological,geochemical,and U-Pb zicon age constraints[J].Journal of Asian Earth Sciences,2011,42(5):1018-1029.
[8]XIAO W J,WINDLEY B F,HAO J,et al.Accretion leading to collision and the Permian Solonker suture,Inner Mongolia,China:termination of the Central Asian orogenic belt[J].Tectonics,2003,22(6):1-20.
[9]XIAO W J,WINDLEY B F,HUANG B C,et al.End-Permian to mid-Triassic termination of the accretionary processes of the southern Altaids:implications for the geodynamic evolution,Phanerozoic continental growth,and metallogeny of Central Asia[J].International Journal of Earth Sciences,2009,98(6):1189-1217.
[10]XIAO W J,WINDLEY B F,SUN S,et al.A tale of amalgamation of three Permo-Triassic collage systems in Central Asia:oroclines,sutures,and terminal accretion[J].Annual of Earth and Planetary Sciences,2015,43(16):1-31.
[11]SENGOR A M C,NATAL’IN B A.The tectonic evolution of Asia[M].Cambridge:Cambridge University Press,1996:486-460.
[12]LI J Y.Permian geodynamic setting of Northeast China and adjacent regions:closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate[J].Journal of Asian Earth Sciences,2006,26(3/4):207-224.
[13]TANG K D.Tectonic development of Paleozoic foldbelts at the north margin of the Sino-Korean craton[J].Tectonics,1990,9(2):249-260.
[14]邵济安.中朝板块北缘中段地壳演化[M].北京:北京大学出版社,1991:11-91.
[15]XU B,CHEN B.The structure and evolution of a MiddlePaleozoic orogenic belt between the North China and Siberian Blocks,northern inner Mongolia[J].China Science Journal,1997,27(3):227-232.
[16]王荃.内蒙古中部中朝与西伯利亚古板块间缝合线的确定[J].地质学报,1986,6(1):31-43.
[17]HSU K J,WANG Q,LI L,et al.Geologic evolution of the Neimonides:a working hypothesis[J].Eclogae Geologicae Helvetiae,1991,84(1):1-31.
[18]谷丛楠,周志广,张有宽,等.内蒙古白乃庙地区白音都西群的碎屑锆石年龄及其构造意义[J].现代地质,2012,26(1):1-9.
[19]EIZENHOFER P R,ZHAO G C,ZHANG J,et al.Final closure of the Paleo-Asian Ocean along Solonker suture zone:constraints from geochronological and geochemical data of Permian volcanic and sedimentary rocks[J].Tectonics,2014,33(4):441-463.
[20]李锦轶,张进,杨天南,等.北亚造山区南部及其毗邻地区地壳构造分区与构造演化[J].吉林大学学报(地球科学版),2009,39(4):584-605.
[21]ZHANG S H,ZHAO Y,KRONER A,et al.Early Permian plutons from the northern North China Block:constraints on continental arc evolution and convergent margin magmatism related to the Central Asian Orogenic Belt[J].International China Science Journal,2009,98(6):1441-1467.
[22]JACKSON S E,PEARSON N J,GRIFFIN W L,et al.The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chemical Geology,2011(1/2):47-69.
[23]李钢柱,薄海军,刘永新,等.内蒙古自治区乌拉特中旗索伦山地区扎嘎乌苏幅、浩仁呼都格幅、哈日格那幅、索伦幅、沙布特幅、乌珠尔少布特幅等六幅1∶5万区域地质矿产调查报告[R].呼和浩特:武警黄金第二支队,2016.
[24]ANDERSON D J,HUYVAERT K P,APANIUS V,et al.Population size and trends of the Waved Albatross Phoebastria irrorata[J].Marine Ornithology,2002,30(2):63-69.
[25]LUDWIG K R.Squid 1.02:a user’s manual[M].Berkeley:Berkeley Geochronology Centre,Special Publication,2001:1-19.
[26]SUN S S,MCDOUGH W F,SAUNDERS A D,et al.Chemical and isotopic systematic of oceanic basalts:implications for mantle composition and processes:magmatism in ocean basins[J].Geological Society,Special Publications,1989,42:313-345.
[27]薛建平,苏尚国,李成元,等.内蒙古索伦山地区蛇绿岩岩石单元地质特征、就位机制及时限[J].现代地质,2017,31(3):498-507.
[28]RICKWOOD P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].Lithosphere,1989,22(4):247-263.
[29]LE MAITRE R W,STRECKEISEN A,ZANETTIN B,et al.Igneous rocks:a classification and glossary of terms[M].2nd ed.Cambridge:Cambridge University Press,2002:196-215.
[30]BARKER F.Trondhjemites,dacites,and related rocks(developments in petrology)[M].Amsterdam:Elsevier,1979:1-12.
[31]BARKER F,ARTH J G.Generation of trondhjemitic-tonalitic liquids and Archean bimodal trondhjemite-basalt suites[J].Geology,1976,4(10),596-600.
[32]ANDERS E,GREVESSE N.Abundances of the elements:meteoritic and solar[J].Geochemical et Cosmochimica Acta,1989,53(1):197-214.
[33]冯艳芳,邓晋福,肖庆辉,等.TTG岩类的识别:讨论与建议[J].高校地质学报,2011,17(3):406-414.
[34]邓晋福,刘翠,冯艳芳,等.关于火成岩常用图解的正确使用:讨论与建议[J].地质论评,2015,61(4):717-734.
[35]PEATE D W,PEARCE J A,HAWKESWORTH C J,et al.Geochemical variations in vanuatu arc lavas:the role of subducted material and a variable mantal wedge composition[J].Journal of Petrology,1997,38(10):1331-1358.
[36]MARSKE K A,LESCHEN R A,BUCKLEY T R.Reconciling phylogeography and ecological niche models for New Zealand beetles:looking beyond glacial refugia[J].Molecular Phylogenetics and Evolution,2011,59(1):89-102.
[37]PEARCE J A.Source and settings of granitic rocks[J].Episodes,1996,19(4):120-125.
[38]MUELLER D.Plate tectonics and crustal evolution[M].New York:Pergamon Press,1976:421-422.
[39]PITCHER W S.Granite type and tectonic environment[C]∥HSU K J.Mountain building processes.London:London Press,1982:19-40.
[40]PITCHER W S.The nature and origin of granite[M].London:Champman&Hall,1997:288-294.
[41]CONDIE K C,BENN K.Archean geodynamics:similar to different from Modern geodynamics?[J].Geophysical Monograph Series,American Geophysical Union,2006,164(5):47-59.
[42]邓晋福,罗照华,苏尚国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004:102-117.
[43]JOHANNES W,HOLTZ F.Petrogensis and experimental Petrology of granitic rocks[M].Berlin:Springer,1996:335.
[44]RAPP R P,WATSON E B.Dehydration melting of metabasalt at 8-32kbar:implications for continental growth and crust-mantle recycling[J].Journal of Petrology,1995,36(4):891-931.
[45]DRUMMOND M S,DEFANT M J,KEPEZHINSKAS P K.Petrosenesis of slab-derived trondhjemite-TTG-dacite/adakite magmas[J].Transactions of the Society Edinburgh,Earth Sciences,1996,87(1/2):205-215.
[46]邓晋福,肖庆辉,苏尚国,等.火成岩组合与构造环境:讨论[J].高校地质学报,2007,13(3):392-402.
[47]LE MAITRE R W.火成岩分类及术语辞典[M].王碧香,译.北京:地质出版社,1991.
[48]MANIAR P D,PICCOLI P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
[49]童英,洪大卫,王涛,等.中蒙边境中段花岗岩时空分布特征及构造和找矿意义[J].地球学报,2010,31(3):395-412.