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岩石学报  2001 

Geochemical constraints on petrogenesis of Hashatubei ultramafic complex,Inner Mongolia.
内蒙古哈沙图北超镁铁杂岩体成因的地球化学制约

Keywords: Petrogenesis,Geochemistry,ultramafic complex,Inner Mongolia
岩石成因
,地球化学,超镁铁杂岩体,内蒙古,稀土元素,微量元素,钐-钕同位素

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Abstract:

哈沙图北超镁铁杂岩体位于华北克拉通西北缘,具小规模多岩相的特征,主要由蛇纹石化橄榄岩、橄榄二辉岩、角闪辉石岩、异剥辉石岩及石英闪长玢岩等组成的铁质超镁铁杂岩。岩体由两大系列岩石组成:第一系列岩石结晶粗大,具平坦型稀土元素分配模式,亏损Nb、Ta、Ti等高场强元素(HFSE)和Rb、Cs、Ba等大离子亲石元素(LILE),富集U和Rb,Zr,Hf及HREE等元素含量变化较大,为大陆地壳拉张环境下富集型岩石圈地幔较高程度熔融形成的岩浆经小规模分异后分期侵入原地结晶形成的,在每期岩浆结晶初期存在一定程度的堆晶作用。第二系列岩石呈致密太,磁铁矿含量较高,岩石风化表面呈黄褐色,亏损Rb、Cs、K、Ti,富集Nb、Ta、Pb、LREE,∑REE高,为初始洋壳下富集地幔较低程度熔融形成的岩浆结晶的产物。Nd同位素组成变化较小(^143Nd/^144Nd=0.5122-0.5124),两个系列岩石中分配系数相等的微量元素比值分别分布在两个区域,岩石地球化学特征表明,该岩体为一长寿命的岩浆通道中不同源区、不同构造环境中不同期岩浆的堆积物,岩浆源区为EM1型富集地幔;表明华北克拉通西北缘在古元古代以来存在长期的陆壳增生事件,经历了拉张减薄、初始洋壳演化阶段。

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