华北板块北缘中段姚五沟岩体锆石U-Pb定年、地球化学特征及其与区域构造演化的关系
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摘要
内蒙古太仆寺旗地区的姚五沟岩体位于华北板块北缘中段,主要岩石类型为花岗斑岩。岩体LA-ICP-MS锆石U-Pb测年结果为141.6 Ma±1.3 Ma(MSWD=0.78),形成于晚侏罗世。岩石化学特征显示岩体具高硅富碱的特征,A/CNK=0.93～1.07,为准铝质-弱过铝质,属高钾钙碱性系列。稀土配分模式呈右倾"V"字型,Eu负异常较显著(δEu=0.30～0.43),轻重稀土分异明显(w(La)N/w(Yb)N=34.04～48.59)。微量元素表现出富集Rb、Th、K等大离子亲石元素,亏损Ba、Sr和Nb、Ta、Ti、P等高场强元素,具有较高的10000×w(Ga)/w(Al)值(2.85～2.92)和w(Zr+Nb+Ce+Y)值(537.80×10~(-6)～584.10×10~(-6));表明其属A型花岗岩,由下地壳部分熔融而来,并伴随少量幔源组分参与,形成于非造山伸展环境。与研究区内的后淖S型花岗岩(255.8 Ma±1.6Ma,晚二叠世)和白旗A型花岗岩(134.6Ma±1.1Ma,晚侏罗世)的地球化学特征对比,发现由晚二叠世到晚侏罗世,岩浆源区由上地壳的泥质岩部分熔融转换为下地壳部分熔融,并伴随少量幔源组分参与,其大地构造背景由陆-陆碰撞环境转换为非造山伸展环境。
The Yaowugou granite in Taibus Bannner of Inner Mongolia is located in the middle section of northern margin of the North China plate mainly consisting of granite porphyry.LA-ICP-MS zircon U-Pb dating is 141.6 Ma±1.3 Ma(MSWD=0.78),showing Late Jurassic intrusives.The geochemistry of this rock is characterized by high concentrations of silica and alkali,A/CNK=0.93～1.07,belongs metaluminous to weakly peraluminous and high-K calc-alkaline to shoshonite granite.The REE distribution patterns is characterized by obvious negative anomalies(δEu=0.30～0.43)and exhibits right-dipping "V"patterns with LREE enrichment(w(La)N/w(Yb)N=34.04～48.59).In addition,the granite is riched in Rb,Th,K and other large ion lithophile elements(LILE),while Ba,Sr and Nb,Ta,P,Ti and other high field strength elements(HESE)are relatively depleted and it has high 10000×w(Ga)/w(Al)(2.85～2.92)and w(Zr+Nb+Ce+Y)(537.80×10~(-6)～584.10×10~(-6))ratio values,showing the features of Atype granite and it is formed in the non-orogenic extensional tectonic setting.Compared with the geochemical characteristics of Late Permain Hounao S-type granite(255.8 Ma±1.6 Ma)and Late Jurassic Baiqi A-type granite(134.6 Ma±1.1 Ma),it is suggested that the granite formed by partial melting of argillaceous rock in the upper crust transformed into the lower crust with a few mantle-derived composition from Late Permain to Late Jurassic,while the tectonic setting is transformed from the continental collison tectonic setting into the non-orogenic extensional tectonic setting.
The Yaowugou granite in Taibus Bannner of Inner Mongolia is located in the middle section of northern margin of the North China plate mainly consisting of granite porphyry.LA-ICP-MS zircon U-Pb dating is 141.6 Ma±1.3 Ma(MSWD=0.78),showing Late Jurassic intrusives.The geochemistry of this rock is characterized by high concentrations of silica and alkali,A/CNK=0.93～1.07,belongs metaluminous to weakly peraluminous and high-K calc-alkaline to shoshonite granite.The REE distribution patterns is characterized by obvious negative anomalies(δEu=0.30～0.43)and exhibits right-dipping "V"patterns with LREE enrichment(w(La)N/w(Yb)N=34.04～48.59).In addition,the granite is riched in Rb,Th,K and other large ion lithophile elements(LILE),while Ba,Sr and Nb,Ta,P,Ti and other high field strength elements(HESE)are relatively depleted and it has high 10000×w(Ga)/w(Al)(2.85～2.92)and w(Zr+Nb+Ce+Y)(537.80×10~(-6)～584.10×10~(-6))ratio values,showing the features of Atype granite and it is formed in the non-orogenic extensional tectonic setting.Compared with the geochemical characteristics of Late Permain Hounao S-type granite(255.8 Ma±1.6 Ma)and Late Jurassic Baiqi A-type granite(134.6 Ma±1.1 Ma),it is suggested that the granite formed by partial melting of argillaceous rock in the upper crust transformed into the lower crust with a few mantle-derived composition from Late Permain to Late Jurassic,while the tectonic setting is transformed from the continental collison tectonic setting into the non-orogenic extensional tectonic setting.
引文
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[12]周振华,吕林素,杨永军,等.内蒙古黄岗锡铁矿区早白垩世A型花岗岩成因:锆石U-Pb年代学和岩石地球化学制约[J].岩石学报,2010,26(12):3521-3537.
[13]杨奇荻,郭磊,王涛,等.大兴安岭中南段甘珠尔庙地区晚中生代两期花岗岩的时代、成因、物源及其构造背景[J].岩石学报,2014,30(7):1961-1981.
[14]袁建国,顾玉超,肖荣阁,等.内蒙古锡林浩特东部地区早白垩世花岗岩地球化学、锆石U-Pb年龄及地质意义[J].现代地质,2017,31(1):20-32.
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[16]Kusky T M,Windley B F,Zhai MG.Tectonic evolution of the North China Block:From orogen to craton to orogen[J].Geological Society,London,Special Publications,2007,280(1):1-34.
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[19]秦亚,梁一鸿,邢济麒,等.内蒙古正镶白旗地区早白垩世A型花岗岩锆石LA-CIP-MS测年、地球化学特征及其地质意义[J].吉林大学学报,2012,42(S3):154-165.
[20]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.
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[22]Middlemost E A K.Naming mateeials in the magma/igneous rocksystem[J].Earth-Science Reviews,1994,37(3-4):214-224.
[23]Middlemost E A K.Magmas and Magmatic Rocks:An Introduction to Igneous Petrology[R].London:Longman,1985:1-266.
[24]Peccerillo A,Taylor S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the kastamonu area,Northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58(1):63-81.
[25]Chappell B W.Aluminium saturation in I and S-type granites and the characterization of fractionated haplo granites[J].Lithos,1999,46(3):535-551.
[26]Wu F Y,Jahn B,Wilde S A,et al.Highly fractionated I-type granites in NE China(I):geochronology and petrogenesis[J].Lithos,2003,66(3):241-273.
[27]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.
[28]King P L,White A J R,Chappell B W,et al.Characterization and origin of aluminous A-type granites from the Lachlan Fold belt,Southeastern Australia[J].Petrology,1997,38(3):371-391.
[29]White A J R,Chappell B W.Ultrametamorphism and granitoid genesis[J].Tectonophysics,1977,43(1-2):7-22.
[30]张旗,王焰,李承东,等.花岗岩的Sr-Yb分类及其地质意义[J].岩石学报,2006,22(9):2249-2269.
[31]Anderson D L.Theory of the Earth[M].Boston M A:Blackwell Scientific Publications,1989:81-82,112,356-360.
[32]Hoskin PWO,Ireland T R.Rare earth element chemistry of zircon and its use as a provenance indicator[J].Geology,2000,28(7):627-630.
[33]Li X H,Liang X R,Sun M,et al.Geochronology and geochemistry of single-grain zircons Simultaneous in-situ analysis of U-Pb age and trace elements by LA-ICP-MS[J].European Journal of Mineralogy,2000,12(5):1015-1024.
[34]Patino Douce A E.What do experiments tell us about the relative contributions of crust and mantle to the origin of granitic magmas[C]//Castro A,Fernandez C,Vigneresse J L(eds).Understanding Granites:Integrating New and Classical Techniques.Geological Society,London,Special Publications,1999,168(1):55-75.
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