大兴安岭中段扎赉特旗地区满克头鄂博组火山岩锆石U-Pb年龄及地球化学特征
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摘要
对大兴安岭中段扎赉特旗地区满克头鄂博组火山岩进行了锆石U-Pb年龄和地球化学研究。用LA-ICP-MS测得流纹质隐爆角砾岩(TW6)和流纹岩(TW14)中锆石的~(206)Pb/~(238)U年龄分别为157.2±1.2Ma和154.8±1.1Ma,表明火山岩形成于晚侏罗世。岩石地球化学特征表明,火山岩富硅碱、贫钙镁,为过铝质钙碱性系列;(La/Yb)_N=20.24~22.68,轻、重稀土元素分馏明显;球粒陨石标准化稀土元素配分模式图呈右倾形式,Eu为正异常;原始地幔标准化蛛网图显示,大离子亲石元素Rb、K相对富集,高场强元素Nb、Ti、P强烈亏损,显示壳源岩浆的特征。综合本区火山岩的特征并结合他人研究成果,认为扎赉特旗地区满克头鄂博组火山岩的形成与蒙古-鄂霍次克洋闭合后伸展作用关系密切。
Chronologic and geochemical studies of volcanic rocks in Manketouebo Formation from Jalaid Banner area are presented in this paper.The zircon U-Pb dating results show that the ages of rhyolitic breccia(TW6)and rhyolite(TW14)are 157.2±1.2Ma(MSWD=0.33,n=22)and 154.8±1.1Ma(MSWD=0.34,n=28)respectively,indicating that the volcanic rocks were formed in Late Jurassic.Geochemical characteristics indicate that the volcanic rocks are rich in silicon and alkali but poor in calcium and magnesium,and belong to peraluminous calc-alkali series.The chondrite-normalized REE patterns indicate that the volcanic rocks are enriched in light rare earth elements with significant fractionation of HREE and LREE((La/Yb)_N=20.24-22.68),and Eu has a positive anomaly.The primitive mantle-normalized trace element spidergram shows that the volcanic rocks contain high LILE(Rb,K)and low HFSE(Nb,Ti,P),suggesting crust magma source.In combination with all the characteristics of the volcanic rocks and other research results,the authors hold that the volcanic rocks in Manketouebo Formation were closely related to the lithosphere extension after the closure of Mongol-Okhotsk Ocean.
Chronologic and geochemical studies of volcanic rocks in Manketouebo Formation from Jalaid Banner area are presented in this paper.The zircon U-Pb dating results show that the ages of rhyolitic breccia(TW6)and rhyolite(TW14)are 157.2±1.2Ma(MSWD=0.33,n=22)and 154.8±1.1Ma(MSWD=0.34,n=28)respectively,indicating that the volcanic rocks were formed in Late Jurassic.Geochemical characteristics indicate that the volcanic rocks are rich in silicon and alkali but poor in calcium and magnesium,and belong to peraluminous calc-alkali series.The chondrite-normalized REE patterns indicate that the volcanic rocks are enriched in light rare earth elements with significant fractionation of HREE and LREE((La/Yb)_N=20.24-22.68),and Eu has a positive anomaly.The primitive mantle-normalized trace element spidergram shows that the volcanic rocks contain high LILE(Rb,K)and low HFSE(Nb,Ti,P),suggesting crust magma source.In combination with all the characteristics of the volcanic rocks and other research results,the authors hold that the volcanic rocks in Manketouebo Formation were closely related to the lithosphere extension after the closure of Mongol-Okhotsk Ocean.
引文
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[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]林强,葛文春,孙德有,等.中国东北地区中生代火山岩的大地构造意义[J].地质科学,1998,32(2):129-139.
[17]Yuan H L,Gao S,Liu X,et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma-mass spectrometry[J].Geostandards and Geoanalytical Research,2004,28(3):353-370.
[18]郭锋,范蔚铭,王岳军,等.大兴安岭南段晚中生代双峰式火山作用[J].岩石学报,2001,17(1):161-168.
[19]张玉涛,张连昌,英基丰,等.大兴安岭北部扎兰屯脉岩群的地球化学特征及其地质意义[J].岩石学报,2006,22(11):2733-2742.
[20]高晓峰,郭锋,李超文.南兴安岭晚中生代火山岩的岩石成因(II):Pb同位素制约[J].中山大学学报(自然科学版),2009,48(6):121-126.
[21]赵国龙,杨桂林,傅嘉友,等.大兴安岭中南部中生代火山岩[M].北京:北京科学技术出版社,1989:1-260.
[22]孟凡超,刘嘉麒,崔岩,等.中国东北地区中生代构造体制的转变:来自火山岩时空分布与岩石组合的制约[J].岩石学报,2014,30(12):3569-3586.
[2]Zhang J H,GaoS,Ge W C,et al.Geochronology of the Mesozoic volcanic rocks in the Great Xing'anRange,northeastern China:implications for subduction-induced delamination[J].Chemical Geology,2010,276:144-165.
[3]杨扬,高福红,陈井胜,等.赤峰地区中生代火山岩锆石U-Pb年代学证据[J].吉林大学学报:地球科学版,2012,42(增刊2):257-268.
[4]张超,杨伟红,和钟铧,等.大兴安岭中南段塔尔气地区满克头鄂博组流纹岩年代学和地球化学研究[J].世界地质,2014,33(2):255-265.
[5]杜洋,刘正宏,崔维龙,等.大兴安岭克一河地区满克头鄂博组火山岩形成时代、地球化学特征及地质意义[J].世界地质,2017,36(1):54-65.
[6]王春宇,王东彬,屈嘉骥.大兴安岭北段克一河地区满克头鄂博组流纹岩的年代及地球化学特征[J].黑龙江科技大学学报,2017,(1):46-50.
[7]周智超,蒋职权.内蒙古扎赉特旗满克头鄂博组火山岩地球化学特征及其成因[J].西部资源,2017,(3):1-4.
[8]Liu Y S,Gao S,Hu Z,et al.Continental andoceanic crust recyclinginduced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2009,51(1&2):537-571.
[9]Liu,Y S,Hu Z C,Zong K Q,et al.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J].Chinese Science Bulletin,2010,55(15):1535-1546.
[10]Ludwig K R.Isoplot 3.0-a geochronological toolkit for Microsoft Excel[J].Special Publication Berkeley Geochronology Center,2003:1-70.
[11]李鹏川,李世超,刘正宏,等.内蒙古林西地区满克头鄂博组火山岩形成时代及构造环境[J].世界地质,2016,35(1):77-88.
[12]许文良,王枫,裴福萍,等.中国东北中生代构造体制与区域成矿背景:来自中生代火山岩组合时空变化的制约[J].岩石学报,2013,29(2):339-353.
[13]Wang F,Zhou X H,Zhang L C,et al.Late Mesozoic volcanism in the Great Xing'an Range(NE China):Timing and implications for the dynamic setting of NE Asia[J].Earth and Planetary Science Letters,2006,251:179-198.
[14]秦涛,郑常青,崔天日,等.内蒙古扎兰屯地区白音高老组火山岩地球化学、年代学及其地质意义[J].地质与资源,2014,23(2):146-153.
[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]林强,葛文春,孙德有,等.中国东北地区中生代火山岩的大地构造意义[J].地质科学,1998,32(2):129-139.
[17]Yuan H L,Gao S,Liu X,et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma-mass spectrometry[J].Geostandards and Geoanalytical Research,2004,28(3):353-370.
[18]郭锋,范蔚铭,王岳军,等.大兴安岭南段晚中生代双峰式火山作用[J].岩石学报,2001,17(1):161-168.
[19]张玉涛,张连昌,英基丰,等.大兴安岭北部扎兰屯脉岩群的地球化学特征及其地质意义[J].岩石学报,2006,22(11):2733-2742.
[20]高晓峰,郭锋,李超文.南兴安岭晚中生代火山岩的岩石成因(II):Pb同位素制约[J].中山大学学报(自然科学版),2009,48(6):121-126.
[21]赵国龙,杨桂林,傅嘉友,等.大兴安岭中南部中生代火山岩[M].北京:北京科学技术出版社,1989:1-260.
[22]孟凡超,刘嘉麒,崔岩,等.中国东北地区中生代构造体制的转变:来自火山岩时空分布与岩石组合的制约[J].岩石学报,2014,30(12):3569-3586.
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