辽北清原地区英云闪长岩年代学、地球化学特征及其地质意义
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摘要
辽北清原地区英云闪长岩的岩石化学成分具有富SiO_2、Al_2O_3、Na_2O,Ba、Mg~#,LREE,而贫K_2O、Yb、Y、HREE的特点,显示奥长花岗岩演化趋势,并具有Adakite(埃达克岩)和新太古代富铝型TTG岩石特征。岩石∑REE偏低,稀土元素显示强烈分异,基本无Eu异常,Nb、Ta和Yi负异常,具有低的Nb/Ta、(La/Yb)N比值及其它微量元素特征,表明其与岛弧或大陆边缘弧玄武质岩石特征相似。岩石LA-ICP-MS锆石U-Pb同位素定年表明该岩石形成年龄为2 550.2±7.1 Ma,时代为新太古代。地球化学特征指示英云闪长岩可能是在较高温度和压力下由俯冲的含水玄武质洋壳部分熔融形成,残留相中有较多的角闪石和斜长石,较少的石榴石。辽北清原地区英云闪长岩的这种成因机制表明当时陆壳以水平方式增生,华北克拉通2.5 Ga左右可能存在微陆块碰撞拼合事件,碰撞拼合之前不同微陆块之间可能存在一个古大洋。
The rock chemical composition of the Tonalite in Qingyuan area of northern Liaoning province is rich in SiO_2, Al_2O_3, Na_2O, Ba, Mg, and LREE, but poor in K_2O, Yb, Y, and HREE,which show the evolutionary trend of the orthogonal granite with Adakite(Adak Rock)and Neoarchean Al-rich TTG rock features.The ∑REE of rock is low, REE show strong differentiation, basically no anomalies of Eu, negative anomalies of Nb, Ta, and Yi,low Nb/Ta and(La/Yb)_N ratios show that they are related to island arcs or basaltic rocks on the continental margin. The rock LA-ICP-MS zircon U-Pb isotopic dating indicates that the rock formation age is 2 550.2±7.1 Ma, which is in Neoarchean. The geochemical characteristics indicate that the Tonalite is likely to be partially formed by subduction of the submerged basaltic oceanic crust at higher temperatures and pressures. There are more amphibole and plagioclase in the residual phase, containing less garnet. The genesis mechanism of the Tonalite in the Qingyuan area of northern Liaoning Province indicates that the continental crust was proliferated horizontally at that time. Due to the existence of a microcontinent collision event around 2.5 Ga of the North China Craton, there may be one ancient ocean between the different microlandmass before the collision and consolidation.
The rock chemical composition of the Tonalite in Qingyuan area of northern Liaoning province is rich in SiO_2, Al_2O_3, Na_2O, Ba, Mg, and LREE, but poor in K_2O, Yb, Y, and HREE,which show the evolutionary trend of the orthogonal granite with Adakite(Adak Rock)and Neoarchean Al-rich TTG rock features.The ∑REE of rock is low, REE show strong differentiation, basically no anomalies of Eu, negative anomalies of Nb, Ta, and Yi,low Nb/Ta and(La/Yb)_N ratios show that they are related to island arcs or basaltic rocks on the continental margin. The rock LA-ICP-MS zircon U-Pb isotopic dating indicates that the rock formation age is 2 550.2±7.1 Ma, which is in Neoarchean. The geochemical characteristics indicate that the Tonalite is likely to be partially formed by subduction of the submerged basaltic oceanic crust at higher temperatures and pressures. There are more amphibole and plagioclase in the residual phase, containing less garnet. The genesis mechanism of the Tonalite in the Qingyuan area of northern Liaoning Province indicates that the continental crust was proliferated horizontally at that time. Due to the existence of a microcontinent collision event around 2.5 Ga of the North China Craton, there may be one ancient ocean between the different microlandmass before the collision and consolidation.
引文
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[34]吴鸣谦,左梦璐,张德会,等.TTG岩套的成因及其形成环境[J].地质评论,2014,60(3):503-514.
[35]张旗,王焰,刘伟,等.埃达克岩的特征及其意义[J].地质通报,2002,21(7):431-435.
[36]王仁民.华北太古宙两类灰色片麻岩及其地质意义[J].地质学报,1994,2:119-131.
[2]Liu D Y,Nutman A P.Compston W,et al.Remnants Of 3800crust in the Chinese part Of thSino-Korea-nearton[J].Geolory,1992,20:339-342.
[3]翟明国,郭敬辉.中国华北太古宙高压麻粒岩的发现及其初步研究[J].中国科学(B),1992,12:1325-1330.
[4]翟明国,郭敬辉,刘永刚,等.华北太古宙退变质榴辉岩的发现及其含义[J].科学通报,1995,40(17):1590-1594.
[5]邓晋福,吴宗絮,赵国春,等.华北地台前寒武纪花岗岩类、陆壳演化与克拉通形成[J].岩石学报,1999,15(2):190-198.
[6]万渝生,宋彪,耿元生,等.辽北抚顺-清原地区太古宙基底地球化学组成特征及其地质意义[J].地质评论,2005,51(2):128-137.
[7]伍家善,耿元生,沈其韩,等.中朝古大陆太古宙地质特征及构造演化[M].北京:地质出版社,1998,160-184.
[8]Kusky T M,Li J H,Tucker R D.The Archean Dongwanzi ophiolite complex,North China craton:2.505-billion-yearold oceanic crust and mantle.[J].Science,2001,292(5519):1142-1145.
[9]Li Jianghai,Kusky T M,Huang Xiongnan.Archean podiform chrom itites and mantle tectonites in ophiolitic melange,North China Craton:a record of early oceanic mantle processes[J].GSA Today,2001,12(7):4-11.
[10]沈其韩,徐惠芬,张宗清,等.中国前寒武纪麻岩[M].北京:地质出版社,1992,389-400.
[11]王鸿祯.地球的节律与大陆动力学的思考[J].地学前缘,1997,3:1-12.
[12]赵振华.微量元素地球化学原理[M].北京:科学出版社,1997,20-150.
[13]Zhao G C,Cawood P A.Precambrian geology of China[J].Precambrian Research,2012,222-223:13-54.
[14]沈其韩,钱祥麟.中国太古宙地质体组成,阶段划分和演化[J].地球学报,1995,2:113-120.
[15]翟明国,卞爱国.华北克拉通新太古代末超大陆拼合及古元古代末-中元古代裂解[J].中国科学(J),2000,30(S1),129-137.
[16]Zhao G C,Sun M,Wilde S A,et al.Late Archean to Paleoproterozoic evolution of the North China Craton:key issues revisited[J].Precambrian Research,2005,136(2):177-202.
[17]Wu M L,Zhao G C,Sun M,et al.Zircon U-Pb geochronology and Hf isotopes of major lithologies from the Jiaodong Terrane:implications for the crustal evolution of the eastern block of the North China Craton[J].Lithos,2014,190-191:71-84.
[18]Zhao G C,Cawood P A.Precambrian geology of China[J].Precambrian Research,2012,222-223:13-54.
[19]Liu D Y,Wilde S A,Wan Y S,et al.New U-Pb and Hf isotopic data confirm Anshan as the oldest preserved segment of the North China Craton[J].American Journal of Science,2008,308(3):200-231.
[20]万渝生,伍家善,刘敦一,等.鞍山3.3 Ga陈台沟花岗岩地球化学和Nd、Pb同位素特征[J].地球学报,1997,18(4):382-388.
[21]沈保丰,骆辉,韩国刚,等.辽北-吉南太古宙地质及成矿[M].北京:地质出版社,1994.
[22]毛德宝,沈保丰,李俊建,等.辽北清原地区太古宙地质演化及其对成矿的控制作用[J].前寒武纪研究进展,1997,3:1-10.
[23]王松山,胡世玲,翟明国,等.应用40Ar/39Ar定年技术研究清原花岗岩-绿岩地体的形成时代[J].岩石学报,1987,4:55-62.
[24]吴福元.辽北太古宙岩石形成的构造背景与地壳演化[J].辽宁地质,1991,2:148-157.
[25]葛文春,吴福元,孙德有.吉林夹皮沟地区变质作用与地壳演化[J].长春地质学院学报,1993,23(3):299-311.
[26]李俊建,沈保丰.辽吉地区早前寒武纪大陆壳的地质年代学[J].前寒武纪研究进展,2000,4:244-249.
[27]万渝生,宋彪,杨淳,等.辽宁抚顺-清原地区太古宙岩石SHRIMP锆石U-Pb年代学及其地质意义[J].地质学报,2005,79(1):78-87.
[28]张旗,翟明国.太古宙TTG岩石是什么含义?[J].岩石学报,2012,28(11):3446-3456.
[29]Chappell B W.White A J R.I-and-S-type granites in the Lachlan Fold Belt[J].Transactions of the Royal Society of Edinburgh:Earth Sciences,1992,83(1-2):1-26.
[30]Waston E B,Harrison T M.Zircon saturation revisited:Temperature and composition effect in a variety of crustal magmas types[J].Earth and Planetary Science Letters,1983,64(2):295-304.
[31]Klein M,Seck H A,Stosch H G,et al.Experimental REEPartitioning between Amphibole,Clinopyroxene,Garnet and Basaltic to Tonalitic Melts:Applications to the Tonalite Genesis[J].Mineral Magazine,1994,58:487-488.
[32]Liu S W,Li J H,Pan Y M,et al.An ArcheanMetamorphic Block in the Taihangshan-Hengshan Block:Constraints in Chronology and Geochemistry[J].Progress in Natural Science,2002,12(7):1-14.
[33]张健,刘树文,潘元明,等.五台山晚太古代花岗岩的成因及其动力学意义[J].北京大学学报(自然科学版),2004,40(2):216-227.
[34]吴鸣谦,左梦璐,张德会,等.TTG岩套的成因及其形成环境[J].地质评论,2014,60(3):503-514.
[35]张旗,王焰,刘伟,等.埃达克岩的特征及其意义[J].地质通报,2002,21(7):431-435.
[36]王仁民.华北太古宙两类灰色片麻岩及其地质意义[J].地质学报,1994,2:119-131.