内蒙古突泉县姜家屯侏罗纪花岗闪长岩年代学及地球化学特征
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摘要
对姜家屯花岗闪长岩进行的同位素年代学及岩石地球化学研究显示,花岗闪长岩LA-ICP-MS锆石U-Pb加权平均年龄为154.8±1.8 Ma,表明该侵入体是晚侏罗世形成的.岩石学及地球化学数据显示其属于高钾钙碱性系列,具A型花岗岩特征.岩石高硅(SiO_2=66.08%~67.80%)、富碱(K_2O+Na_2O=7.35%~7.97%)、富铝(Al_2O_3=14.5~15.23)、贫镁(MgO=1.08%~1.62%)、贫钙(CaO=2.05%~3.04%)、低钛(TiO_2=0.56%~0.67%),轻稀土富集,重稀土相对亏损,稀土配分曲线呈右倾型,具明显的负铕异常,轻稀土分馏较好.微量元素亏损Sr、Ba、Ta、Nb,而Th、Zr、Hf、Pb相对富集,在微量元素原始地幔标准化蛛网图上显示明显Sr、Ba、Ti负异常的特征.综合这些特征认为,姜家屯花岗闪长岩是受古太平洋板块俯冲影响,造山后岩石圈伸展剪薄环境下的产物.
Study on the isotopic chronology and lithogeochemistry of the Jiangjiatun granodiorite in Tuquan County,Inner Mongolia,indicates that the LA-ICP-MS zircon U-Pb weighted average age for the rock body is 154.8±1.8 Ma,which represents Late Jurassic.The petrological and geochemical data shows the granodiorite,belonging to high-K calcalkaline series and A-type granite,is characterized by high SiO——2(66.08%-67.80%),rich alkali(K_2O+Na_2O=7.35%-7.97%),rich Al_2O_3(14.5-15.23),poor MgO(1.08%-1.62%),poor CaO(2.05%-3.04%)and low TiO_2(0.56%-0.67%).The REE pattern curves are right-dipping with evident negative Eu anomalies and well LREE fractionation.The primitive mantle normalized trace element spidergrams show distinct negative Sr,Ba and Ti anomalies,depletion of Sr,Ba,Ta and Nb,and relative enrichment of Th,Zr,Hf and Pb.From the above,it is thought that the Jiangjiatun granodiorite is the product of post-orogenic lithosphere extension and shear thinning background affected by the subduction of Paleo-Pacific Plate.
Study on the isotopic chronology and lithogeochemistry of the Jiangjiatun granodiorite in Tuquan County,Inner Mongolia,indicates that the LA-ICP-MS zircon U-Pb weighted average age for the rock body is 154.8±1.8 Ma,which represents Late Jurassic.The petrological and geochemical data shows the granodiorite,belonging to high-K calcalkaline series and A-type granite,is characterized by high SiO——2(66.08%-67.80%),rich alkali(K_2O+Na_2O=7.35%-7.97%),rich Al_2O_3(14.5-15.23),poor MgO(1.08%-1.62%),poor CaO(2.05%-3.04%)and low TiO_2(0.56%-0.67%).The REE pattern curves are right-dipping with evident negative Eu anomalies and well LREE fractionation.The primitive mantle normalized trace element spidergrams show distinct negative Sr,Ba and Ti anomalies,depletion of Sr,Ba,Ta and Nb,and relative enrichment of Th,Zr,Hf and Pb.From the above,it is thought that the Jiangjiatun granodiorite is the product of post-orogenic lithosphere extension and shear thinning background affected by the subduction of Paleo-Pacific Plate.
引文
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[4]朱耐文,路凤香,谢意红,等.大路边缘扩张型活动带火山岩组合:松辽盆地周边中生代火山岩研究[J].岩石学报,1997,13(4):551-562.
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[7]林强,葛文春,吴福元,等.大兴安岭中生代花岗岩类的地球化学[J].岩石学报,2004,20(3):403-412.
[8]林强,葛文春,曹林,等.大兴安岭中生代双峰式火山岩的地球化学特征[J].地球化学,2003,32(3):208-222.
[9]葛文春,吴福元,周长勇,等.大兴安岭中部乌兰浩特地区中生代花岗岩石的锆石U-Pb年龄及地质意义[J].岩石学报,2005,21(3):749-762.
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[14]王五力,李永飞,郭胜哲.中国东北地块群及其构造演化[J].地质与资源,2014,23(1):4-21.
[15]李子昊.内蒙古科尔沁右翼中旗新发屯岩体形成时代及地球化学特征[J].地质与资源,2016,25(4):309-316.
[16]Andersen T.Correction of common lead in U-Pb analyses that do not report204Pb[J].Chemical Geology,2002,192(1):59-79.
[17]Ludwing K R.Users manual for Isoplot/EX(Rev.2.49):A geochronological toolkit for Microsoft Excel[J].Berkeley:Geochronology Center Special Publication,2003,4(1):60-61.
[18]Collins W J,Beams S D,White A J R,et al.Nature and origin of A-type granties with particular reference to southeastern Australia[J].Contributions to Mineralogy and Petrology,1982,80(2):189-200.
[19]Peccerillo R,Taylor S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey[J].Contribution to Mineralogy and Petrology,1976,58(1):63-81.
[20]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth Science Reviews,1994,37(3/4):215-224.
[21]Shand S J.Eruptive Rocks.Their genesis,composition,classification,and their relation to ore-deposits;with a chapter on meteorite[M].London:Thomas Mnrby&Co,1950.
[22]宋维民,庞雪娇,付俊彧,等.内蒙古科尔沁右翼中旗碱长花岗岩锆石U-Pb年代学、岩石地球化学及动力学意义[J].吉林大学学报:地球科学版,2015,45(3):847-859.
[23]Boynton W V.Cosmochemistry of the rare earth elements:Meteorite studies[C]//Henderson P,ed.Rare Earth Elements Geochemistry.Amsterdam:Elsevier,1984:63-114.
[24]Sun S S,Mc Donough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[25]陈建林,郭原生,付善明,花岗岩研究进展——ISMA花岗岩分类综述[J].甘肃地质学报,2004,13(1):67-73.
[26]吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题[J].岩石学报,2007,23(6):1217-1238.
[27]邱检生,Mc Innes B I A,蒋少涌,等.江西会昌密坑山岩体的地球化学及其成因类型的新认识[J].地球化学,2005,34(1):20-32.
[28]张旗,冉皞,李承东.A型花岗岩的实质是什么?[J].岩石矿物学杂志,2012,31(4)621-626.
[29]Chappell B W,White A J R.Two contrasting types:25 years later[J].Australian Journal of Earth Science,2001,48(4):489-499.
[30]贾小辉,王强,唐功建.A型花岗岩的研究进展及意义[J].大地构造与成矿学,2009,33(3):465-480.
[31]王强,赵振华,熊小林.桐柏-大别造山带燕山晚期A型花岗岩的厘定[J].岩石矿物学杂志,2000,19(4):297-306.
[32]Watson E B,Harrison T M.Zircon saturation revisited:Temperature and composition effects in a variety of crustal magma types[J].Earth and Planetary Science Letters,1983,64(2):295-304.
[33]Miler F M,Mc Dowell S M,Mapes R W.Hot and cold granite Implication of zircon saturation temperatures and preservation of inheritance[J].Geology,2003,31(6):529-532.
[34]Turner S P,Foden J D,Morrison R S.Dervation of some A-type magmas by fractionation of basaltic magma:An Example from the Padthaway Ridge,South Australia[J].Lithos,1992.28(2):151-179.
[35]Mushkin A,Navon O,Halicz L,et al.The petrogenesis of A-type magmas from the Amram Massif,Southern Israel[J].Journal of Petrology,2003,44(5):815-832.
[36]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,1994,40(9):1377-1397.
[37]Yang J H,Wu F Y,Chung S L,et al.A hybrid origin for the Qianshan A-type granite,Northeast China:Geochemical and Sr-Ndhf isotopic evidence[J].Lithos,2006,89(1/2):89-106.
[38]Skjerlie K P,Johnston A D.Vapor-absent melting at 10 Kbar of a biotite and amphibole-bearing tonalitic geniss:Implications for the generation of A-type granites[J].Geology,1992,20(3):263-266.
[39]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.
[40]Hofmann A W.Chemical differentiation of the earth:The relationship between mantle,Continental crust,and oceanic crust[J].Earth and Planetary Science Letters,1988,90(3);297-314.
[41]Green T H.Significance of Nb/Ta as an indicator of geochemical processes in the crust-mantle system[J].Chemical Geology,1995,120:347-359.
[42]王涛,郑亚东,张进江,等.华北克拉通中生代伸展构造研究的几个问题及其在岩石圈剪薄研究中的意义[J].地质通报,2007,26(9):1154-1166.
[43]翟明国,孟庆任,刘建明,等.华北东部中生代构造体制转折峰期的主要地质效应和形成动力学探讨[J].地学前缘,2004,11(3):285-297.
[44]郑亚东,Davis G A,王琮,等.燕山带中生代主要构造事件与板块构造背景问题[J].岩石学报,2000,74(4):289-299.
[45]张连昌,陈志广,周新华,等.大兴安岭根河地区早白垩世火山岩深部源区与构造-岩浆演化:Sr-Nd-Pb-Hf同位素地球化学制约[J].岩石学报,2007,23(11):2823-2857.
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