内蒙古乌拉特中旗扎嘎乌苏岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义
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摘要
内蒙古乌拉特中旗中蒙边境地区的扎嘎乌苏岩体主要由闪长岩、石英闪长岩、花岗闪长岩和黑云母二长花岗岩组成,岩体及围岩普遍发育面理南倾的糜棱岩带。通过LA-ICP-MS锆石U-Pb测年,获得扎嘎乌苏岩体中黑云母二长花岗岩的结晶年龄为450.3±3.7Ma(MSWD=2.8),表明扎嘎乌苏岩体的形成时代为晚奥陶世。扎嘎乌苏岩体中不同类型岩石全岩微量和稀土元素组成总体相似,均呈现轻稀土元素相对于重稀土元素强烈富集,大离子亲石元素Ba、Sr等富集,高场强元素Nb、Ta、Ti相对亏损,高Sr,低Y、Yb,高Sr/Y、La/Yb值等特征,具有埃达克岩和岛弧岩浆岩的地球化学特征。这些新的年代学和岩石地球化学数据,为索伦山地区晚奥陶世古亚洲洋俯冲消减提供了可靠的证据。
The Zhagawusu intrusive body is located close to the border between China and Mongolia and lies in northern Urad Middle Banner, Inner Mongolia. It mainly consists of diorite, quartz diorite, granodiorite and biotite monzonitic granite. The U-Pb age of zircons from the biotite monzonitic granite determined by LA-ICP-MS is 450.3±3.7 Ma(MSWD=2.8).The rock samples are all characterized by strong enrichment of light rare-earth elements relative to heavy rare-earth elements, depletion of some high field strength elements such as Nb, Ta and Ti, high Sr, low Y and Yb content, and high Sr/Y and La/Yb ratios. The features indicate that the Zhagawusu intrusive body has a transitional normal arc/adakite geochemical affinity. The new age and geochemical data from the Zhagawusu intrusive body provide convincing evidence for Late Ordovician subduction of the Paleo-Asian Ocean in this region.
The Zhagawusu intrusive body is located close to the border between China and Mongolia and lies in northern Urad Middle Banner, Inner Mongolia. It mainly consists of diorite, quartz diorite, granodiorite and biotite monzonitic granite. The U-Pb age of zircons from the biotite monzonitic granite determined by LA-ICP-MS is 450.3±3.7 Ma(MSWD=2.8).The rock samples are all characterized by strong enrichment of light rare-earth elements relative to heavy rare-earth elements, depletion of some high field strength elements such as Nb, Ta and Ti, high Sr, low Y and Yb content, and high Sr/Y and La/Yb ratios. The features indicate that the Zhagawusu intrusive body has a transitional normal arc/adakite geochemical affinity. The new age and geochemical data from the Zhagawusu intrusive body provide convincing evidence for Late Ordovician subduction of the Paleo-Asian Ocean in this region.
引文
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[20]Martin H.Adakitic magmas:modern analogues of Archaeangranitoids[J].Lithos,1999,46(3):411-429.
[21]Sameniego P,Martin H,Robin C,et al.Transition from calcalkalic to adaditic magmatism at Cayambe volcano,Ecuador:insights into slab melts and mantle wedge interactions[J].Geological Society of America,2002,30(11):967-970.
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[23]Bourdon E,Eissen J P,Gutscher M A,et al.Magmatic response to early aseismic ridge subduction:the Ecuadorian margin case(South America)[J].Earth andPlanetary Science Letters,2003,205:123-138.
[24]Castillo P R.An overview of adakite petrogenesis[J].Chinese Science Bulletin,2006,51:257-268.
[25]张旗,金惟俊,熊小林,等.中国不同时代O型埃达克岩的特征及其意义[J].大地构造与成矿学,2009,33(3):432-447.
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[29]Xu B,Charvet J,Chen Y,et al.Middle Paleozoic convergent orogenic belts in western Inner Mongolia(China):framework,kinematics,geochronology and implications for tectonic evolution of the Central Asian Orogenic Belt[J].Gondwana Research,2013,23(4):1342-1364.
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[31]许立权,邓晋福,陈志勇,等.内蒙古达茂旗北部奥陶纪埃达克岩类的识别及其意义[J].现代地质,2003,17(4):428-434.
[32]冯丽霞,张志诚,韩宝福,等.内蒙古达茂旗花岗岩类LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2013,32(11):1737-1746.
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[35]张维,简平.华北北缘固阳二叠纪闪长岩-石英闪长岩-英云闪长岩套SHRIMP年代学[J].中国地质,2012,39(6):1593-1603.
[36]李朋武,高锐,管烨,等.内蒙古中部索伦林西缝合带封闭时代的古地磁分析[J].吉林大学学报(地球科学版),2006,36(5):744-758.
[37]王子进,许文良,裴福萍,等.兴蒙造山带南缘东段中二叠世末-早三叠世镁铁质岩浆作用及其构造意义--来自锆石U-Pb年龄与地球化学的证据[J].地质通报,2013,32(2/3):374-387.
[38]刘珏,郗爱华,葛玉辉,等.内蒙古赤峰地区蒙古营子花岗闪长岩LA-ICP-MS锆石U-Pb年龄及成因[J].地质通报,2015,34(2/3):437-446.
[39]潘桂棠,陆松年,肖庆辉,等.中国大地构造阶段划分和演化.地学前缘,2016,23(6):1-23.
[40]薛建平,刘美玉,李钢柱,等.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[J].地学前缘,2018,25:(3):230-239.
[41]李钢柱,王玉净,李成元,等.内蒙古索伦山蛇绿岩带早二叠世放射虫动物群的发现及其地质意义[J].科学通报,2017,62(5):400-406.
(1)内蒙古自治区地质局.内蒙古桑根达来等4幅1∶20万区域地质调查报告. 1980.
(2)内蒙古地质矿产勘查院.内蒙古1∶25万桑根达来幅区域地质调查修测报告. 2013.
(3)武警黄金第二支队.内蒙古自治区索伦山地区扎嘎乌苏等6幅1∶5万区域地质矿产调查报告. 2017.
[2]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 Review Earth and Planetary Sciences,2015,43:477-507.
[3]洪大卫,王式洸,谢锡林,等.兴蒙造山带正εNd(t)值花岗岩的成因和大陆地壳生长[J].地学前缘,2000,7(2):441-456.
[4]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.
[5]Windley B F,Alexeiev D,Xiao W J,et al.Tectonic models for accretion of the Central Asian Orogenic belt[J].Journal of Society of London,2007,164:31-47.
[6]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.
[7]Jian P,Liu D,Kr?ner A,et al.Evolution of a Permian intraoceanic arc-trench system in the Solonker suture zone,China and Mongolia[J].Lithos,2010,118:169-19.
[8]邓晋福,冯艳芳,狄勇军,等.中国侵入岩大地构造图(1∶250万)[M].北京:地质出版社,2015:1-81.
[9]陶继雄,许立权,贺峰,等.内蒙古巴特敖包地区早古生代洋壳消减的岩石证据[J].地质调查与研究,2005,28(1):1-8.
[10]刘敦一,简平,张旗,等.内蒙古图林凯蛇绿岩中埃达克岩SHRIMP测年:早古生代洋壳消减的证据[J].地质学报,2003,77(3):317-330.
[11]Jackson S E,Pearson N J,Griffin W L.The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chemical Geology,2004,211(1):47-69.
[12]Anderson T.Correction of common lead in U-Pb analyses that do not report204Pb[J].Chemical Geology,2002,192:59-79.
[13]Ludwig K R.Squid 1.02:A User's Manual[M].Berkeley Geochronology Centre,Special Publication,2001:1-19.
[14]Belousova E A,Griffin W L,O’Reilly S Y,et al.Igneous zircon:Trace element composition as an indicator of source rock type[J].Contribution to Mineralogy and Petrology,2002,143:602-622.
[15]吴元宝,郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报,2004,49(16):1589-1604.
[16]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes.[C]//Saunders A D,Norry M J.Magmatism in the Ocean Basins.Geological Society.London:Special Publication,1989,42:313-345.
[17]Defant M J,Drummond M S.Derivation of some modern arc magmas by melting of young subduction lithosphere[J].Nature,1990,347:662-665.
[18]Defant M J,Drummond M S.Mount st.Helens:potentialexample of partial melting of subducted lithosphere in a volcanic arc[J].Geology,1993,21:547-550.
[19]Sajona GF,Maury R C,Bellon H,et al.Initiation of subduction and the generation of slab melts in western and eastern Mindanao,Phillippines[J].Geology,1993,21:1007-1010.
[20]Martin H.Adakitic magmas:modern analogues of Archaeangranitoids[J].Lithos,1999,46(3):411-429.
[21]Sameniego P,Martin H,Robin C,et al.Transition from calcalkalic to adaditic magmatism at Cayambe volcano,Ecuador:insights into slab melts and mantle wedge interactions[J].Geological Society of America,2002,30(11):967-970.
[22]Defant M J,Xu J F,Kepezhinskas P,et al.Adakites:Some variations on a theme[J].Acta Petrologica Sinica,2002,18:129-142.
[23]Bourdon E,Eissen J P,Gutscher M A,et al.Magmatic response to early aseismic ridge subduction:the Ecuadorian margin case(South America)[J].Earth andPlanetary Science Letters,2003,205:123-138.
[24]Castillo P R.An overview of adakite petrogenesis[J].Chinese Science Bulletin,2006,51:257-268.
[25]张旗,金惟俊,熊小林,等.中国不同时代O型埃达克岩的特征及其意义[J].大地构造与成矿学,2009,33(3):432-447.
[26]Jian P,Liu D,Kroner A,et al.Time scale of an early to midPaleozoic orogenic cycle of thelong-lived Central Asian Orogenic Belt,Inner Mongolia of China:implications forcontinental growth[J].Lithos,2008,101(3):233-259.
[27]Jian P,Kroner A,Windley B F,et al.Carboniferous and Cretaceous mafic-ultramafic massifs inInner Mongolia(China):ASHRIMP zircon and geochemical study of the previouslypresumed integral“Hegenshan ophiolite”[J].Lithos.2012,142:48-66.
[28]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 Journal of Earth Sciences,2009,98:1441-1467.
[29]Xu B,Charvet J,Chen Y,et al.Middle Paleozoic convergent orogenic belts in western Inner Mongolia(China):framework,kinematics,geochronology and implications for tectonic evolution of the Central Asian Orogenic Belt[J].Gondwana Research,2013,23(4):1342-1364.
[30]张维,简平.内蒙古达茂旗北部早古生代花岗岩SHRIMP U-Pb年代学[J].地质学报,2008,82(6):778-787.
[31]许立权,邓晋福,陈志勇,等.内蒙古达茂旗北部奥陶纪埃达克岩类的识别及其意义[J].现代地质,2003,17(4):428-434.
[32]冯丽霞,张志诚,韩宝福,等.内蒙古达茂旗花岗岩类LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2013,32(11):1737-1746.
[33]王挽琼,刘正宏,王兴安,等.内蒙古乌拉特中旗海西期黑云母二长花岗岩锆石SHRIMP U-Pb年龄及其地质意义[J].吉林大学学报(地球科学版),2012,42(6):1771-1782.
[34]范宏瑞,胡芳芳,杨奎锋,等.内蒙古白云鄂博地区晚古生代闪长质-花岗质岩石年代学框架及其地质意义[J].岩石学报,2009,(11):2933-2938.
[35]张维,简平.华北北缘固阳二叠纪闪长岩-石英闪长岩-英云闪长岩套SHRIMP年代学[J].中国地质,2012,39(6):1593-1603.
[36]李朋武,高锐,管烨,等.内蒙古中部索伦林西缝合带封闭时代的古地磁分析[J].吉林大学学报(地球科学版),2006,36(5):744-758.
[37]王子进,许文良,裴福萍,等.兴蒙造山带南缘东段中二叠世末-早三叠世镁铁质岩浆作用及其构造意义--来自锆石U-Pb年龄与地球化学的证据[J].地质通报,2013,32(2/3):374-387.
[38]刘珏,郗爱华,葛玉辉,等.内蒙古赤峰地区蒙古营子花岗闪长岩LA-ICP-MS锆石U-Pb年龄及成因[J].地质通报,2015,34(2/3):437-446.
[39]潘桂棠,陆松年,肖庆辉,等.中国大地构造阶段划分和演化.地学前缘,2016,23(6):1-23.
[40]薛建平,刘美玉,李钢柱,等.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[J].地学前缘,2018,25:(3):230-239.
[41]李钢柱,王玉净,李成元,等.内蒙古索伦山蛇绿岩带早二叠世放射虫动物群的发现及其地质意义[J].科学通报,2017,62(5):400-406.
(1)内蒙古自治区地质局.内蒙古桑根达来等4幅1∶20万区域地质调查报告. 1980.
(2)内蒙古地质矿产勘查院.内蒙古1∶25万桑根达来幅区域地质调查修测报告. 2013.
(3)武警黄金第二支队.内蒙古自治区索伦山地区扎嘎乌苏等6幅1∶5万区域地质矿产调查报告. 2017.
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