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地质学报  2005 

俯冲的大陆岛弧--柴北缘片麻岩的地球化学和同位素证据

, PP. 46-55

Keywords: 同位素,地球化学,片麻岩,柴达木北缘

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Abstract:

柴北缘早古生代高压―超高压变质带的片麻岩分为花岗质片麻岩和副片麻岩,花岗质片麻岩的原岩形成于新元古代(900~1000Ma),岩石类型为英云闪长岩-奥长花岗岩-石英二长岩-花岗岩,非活动性元素的特征类似于岛弧环境形成的花岗岩。副片麻岩的原岩可能为富铝的沉积岩,其稀土元素特征类似于PAAS(后太古宙澳大利亚的平均页岩)的稀土元素分布,非活动性元素的特征与大陆岛弧沉积岩的特征类似。根据花岗质片麻岩与副片麻岩的共生关系结合其地球化学特征推测它们的原岩形成于岛弧环境。鱼卡河花岗质片麻岩的εNd(t)=3.2(t=1.0Ga),TDM=1.3Ga,表明岩浆源区有大量起源于亏损地幔的初始地壳物质。而落凤坡、锡铁山、沙柳河的花岗质片麻岩与副片麻岩的Sm-Nd同位素组成类似,εNd(t)=-3.4~-7.3(t=1.0Ga),TDM=1.8~2.2Ga,表明岩浆源区为先存的大陆地壳,两类片麻岩地球化学特征的相似性说明岩浆源区的成分类似于变质沉积岩的组成。这项研究说明柴北缘早古生代的深俯冲卷入了大量的大陆岛弧岩石。

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