内蒙古锡林浩特小乌兰沟早白垩世二长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义
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摘要
通过1∶5万区域地质调查,对中亚造山带南缘内蒙古锡林浩特小乌兰沟地区发育的二长花岗岩进行了岩石学、锆石U-Pb同位素年代学、地球化学等研究。LA-ICP-MS锆石U-Pb测年表明,该花岗岩的侵位年龄为(121. 29±0. 63) Ma,其形成时代为早白垩世。岩石地球化学研究表明,二长花岗岩具有高硅、富钾、贫镁、贫钙、低磷和低钛的特征,属于高钾钙碱性、过铝质系列岩石;微量元素特征表现为富含大离子亲石元素Rb和高场强元素Th、Ta,而亏损Nb、Sr、Ba;稀土元素以略富集轻稀土、Eu亏损为特征。地球化学特征反映其为A型花岗岩,是陆壳岩石部分熔融的产物。构造环境判别图解表明该岩体具有典型的后造山A2型花岗岩特征,说明早白垩世期间锡林浩特小乌兰沟地区已经处于后造山岩石圈伸展构造环境。
Based on 1∶ 50,000 regional geological survey,we studied the monzogranite in the southern Central Asian Orogenic Belt(CAOB) at Xiaowulangou(Xilin Hot,Inner Mongolia) based on its petrology,zircon U-Pb age and geochemistry. LA-ICP-MS zircon U-Pb dating yielded Early Cretaceous age of(121. 29 ± 0. 63) Ma.Petrological and geochemical data reveal that the monzogranite is characterized by high Si and K,low Mg,Ca,P and Ti. The rocks are high-K calc-alkaline and peraluminous. The rocks are enriched in large ion lithophilic elements(LILEs,e. g. Rb) and some high field strength elements(HFSEs,e. g. Th and Ta),but depleted in Nb,Sr and Ba. Rare earth element(REE) compositions are characterized by slight LREE enrichments and negative Eu anomalies. Geochemical characteristics suggest that the monzogranite is A-type,and may have been a product of partial melting of continental crustal rocks. Tectonic discrimination diagrams show that these rocks resemble post-orogenic A2-type granite,indicating that the region was likely in a post-orogenic extensional setting during the Early Cretaceous.
Based on 1∶ 50,000 regional geological survey,we studied the monzogranite in the southern Central Asian Orogenic Belt(CAOB) at Xiaowulangou(Xilin Hot,Inner Mongolia) based on its petrology,zircon U-Pb age and geochemistry. LA-ICP-MS zircon U-Pb dating yielded Early Cretaceous age of(121. 29 ± 0. 63) Ma.Petrological and geochemical data reveal that the monzogranite is characterized by high Si and K,low Mg,Ca,P and Ti. The rocks are high-K calc-alkaline and peraluminous. The rocks are enriched in large ion lithophilic elements(LILEs,e. g. Rb) and some high field strength elements(HFSEs,e. g. Th and Ta),but depleted in Nb,Sr and Ba. Rare earth element(REE) compositions are characterized by slight LREE enrichments and negative Eu anomalies. Geochemical characteristics suggest that the monzogranite is A-type,and may have been a product of partial melting of continental crustal rocks. Tectonic discrimination diagrams show that these rocks resemble post-orogenic A2-type granite,indicating that the region was likely in a post-orogenic extensional setting during the Early Cretaceous.
引文
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[6] CHEN B,JAHN B M,WILDE S,et al. Two contrasting Paleozoic magmatic belts in northern Inner Mongolia,China:Petrogenesis and tectonic implications[J]. Tectonophysics,2000,328:157-182.
[7] 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,2003,22:1069-1088.
[8] WINDLEY B F,ALEXELEW D,XIAO W J,et al. Tectonic models for accretion of the Central Asian Orogenic Belt[J].Journal of the Geological Society,2007,164(1):31-47.
[9] WU F Y,ZHAO G C,SUN D Y,et al. The Hulan Group:Its role in the evolution of the Central Asian Orogenic Belt of NE China[J]. Journal of Asian Earth Sciences,2007,30:542-556.
[10]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.
[11] ZHOU J B,WILDE S A. The crustal accretion history and tectonic evolution of the NE China segment of the Central Asian Orogenic Belt[J]. Gondwana Research,2013,23:1365-1377.
[12] MENG E,XU W L,PEI F P,et al. Permian bimodal volcanism in the Zhangguangcai Range of eastern Heilongjiang Province,NE China:Zircon U-Pb-Hf isotopes and geochemical evidence[J].Journal of Asian Earth Sciences,2011,41:119-132.
[13]刘洪涛，翟明国，刘建明，等．华北克拉通北缘中生代花岗岩:从碰撞后到非造山[J]．岩石学报，2002,18(4):433-448.
[14] WU F,SUN D,GE W,et al. Geochronology of the Phanerozoic granitoids in northeastern China[J]. Journal of Asian Earth Sciences,2011,41(1):1-30.
[15]孟恩，许文良，杨德彬，等．满洲里地区灵泉盆地中生代火山岩的锆石U-Pb年代学、地球化学及其地质意义[J]．岩石学报，2011,27(4):1209-1226.
[16] XU W,JI W,PEI F,et al. Triassic volcanism in eastern Heilongjiang and Jilin provinces,NE China:Chronology,geochemistry,and tectonic implications[J]. Journal of Asian Earth Sciences,2009,34(3):392-402.
[17]潘桂棠，肖庆辉，陆松年，等．中国大地构造单元划分[J]．中国地质，2009,36(1):1-28.
[18] LUDWIG K R. Isoplot/EX,Version 3. 0 A—Geochronological Toolkit for Microsoft Excel[M]. Berkeley:Berkeley Geochronology Center Special Publication,2003:1-70.
[19] ANDERSEN T. Correction of common lead in U-Pb analyses that do not report204Pb[J]. Chemical Geology,2002,192(1/2):59-79.
[20] MANIAR P,PICCOL P M. Tectonic discrimination of granitoids[J]. Geological Society of America Bulletin,1989,101(5):635-643.
[21] LE MAITRE R W,STRECKEISEN A,ZANETTIN B,et al. Igneous Rocks:A Classification and Glossary of Terms[M].Cambridge:Cambridge University Press,2002:1-236.
[22] MIDDLEMOST E A K. Naming materials in the magma/igneous rock system[J]. Earth-Science Reviews,1994,37(3/4):215-224.
[23] PECCERILLO A,TAYLOR S R. Geochemistry of Eocene calcalkaline volcanic rocks from the Kastamomu area,Northern Turkey[J]. Contributions to Mineralogy and Petrology,1976,58(1):63-81.
[24] SUN S S,MCDONOUGH W F. Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J]. Geological Society of London,Special Publications,1989,42(1):313-345.
[25]陈志广，张连昌，吴华英，等．内蒙古西拉木伦成矿带碾子沟钼矿区A型花岗岩地球化学和构造背景[J]．岩石学报，2008,24(4):879-889.
[26]单强，廖思平，卢焕章，等．岩浆到热液演化的包裹体记录———以骑田岭花岗岩体为例[J]．岩石学报，2011,27(5):1511-1520.
[27]葛文春，林强，孙德有，等．大兴安岭中生代两类流纹岩成因的地球化学研究[J]．地球科学———中国地质大学学报，2000,25(2):172-178.
[28]张旗，潘国强，李承东，等．花岗岩结晶分离作用问题———关于花岗岩研究的思考之二[J]．岩石学报，2007,23(6):1239-1251.
[29] HARRIS C,MARSH J S,MILNER S C. Petrology of the alkaline core of the Messum igneous complex,Namibia:evidence for the progressively decreasing effect of crustal contamination[J].Journal of Petrology,1999,40:1377-1397.
[30] WHALEN J B,CURRIE K L,CHAPPELL B W. A-type granites:Geochemical characteristics,discrimination and petrogenesis[J]. Contributions to Mineralogy and Petrology,1987,95(4):407-419.
[31] PATINO DOUCE A E. Generation of metaluminous A-type granites by low-pressure melting of calc-alkaline granitoids[J]. Geology,1997,25:743-746.
[32] CLEMENS J D,HOLLOWAY J R,WHITE A J R. Origin of an A-type granites:experimental constraints[J]. American Mineralogist,1986,71:317-324.
[33] DIXON S S,RUTHERFORD M J. The origin of rhyolite and plagiogranite in oceanic crust:An experimental study[J]. Journal of Petrology,1983,24:1-25.
[34] TISCHENDOR F G,PAELCHEN W. Zur classification von granitoiden/classification of granitoids[J]. Zeitschrift fuer Geologische Wissenschaften,1985,13(5):615-627.
[35]李超文，郭锋，范蔚茗，等．延吉地区晚中生代火山岩的ArAr年代学格架及其大地构造背景[J]．中国科学D辑:地球科学，2007,37(3):319-330.
[36]张连昌，吴华英，相鹏，等．中生代复杂构造体系的成矿过程与成矿作用———以华北大陆北缘西拉木伦钼铜多金属成矿带为例[J]．岩石学报，2010,26(5):1351-1362.
[37]刘翠，邓晋福，许立权，等．大兴安岭—小兴安岭地区中生代岩浆-构造-钼成矿地质事件序列的初步框架[J]．地学前缘，2011,18(3):166-178.
[38]张学斌，周长红，来林，等．锡林浩特东部早白垩世白音高老组岩石地球化学特征、LA-MC-ICP-MS锆石U-Pb年龄及地质意义[J]．地质与勘探，2015,51(2):290-302.
[39]施光海，苗来成，张福勤，等．内蒙古锡林浩特A型花岗岩的时代及区域构造意义[J]．科学通报，2004,49(4):384-389.
[40]程银行，刘永顺，滕学建，等．内蒙古莫合尔图中—晚侏罗世火山岩年代学、地球化学研究及其意义[J]．地质学报，2013,87(7):943-956.
[41]俞礽安，胡鹏，曾威，等．内蒙古苏尼特左旗东苏A型花岗岩的锆石U-Pb年龄、地球化学特征及地质意义[J]．岩石矿物学杂志，2016,35(2):229-241.
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