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地球学报  2004 

南岭东段燕山期镁铁质岩石Nd-Sr同位素研究及意义

Keywords: 镁铁质岩石,Nd-Sr同位素,燕山期,南岭东段

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Abstract:

南岭东段燕山期镁铁质岩浆活动可划分为4个阶段(中侏罗世、晚侏罗世、早白垩世和晚白垩世),分别对应4次重要的伸展拉张作用时期。镁铁质岩石具有基本类似的Nd—Sr同位素特征,ISr较高(一般介于0.705~0.710之间),εNd值变化范围较大(介于-7.90~5.16之间),表明其岩浆源为壳-幔混合源性质。镁铁质岩石具有板内拉斑玄武岩特征,系形成于板内拉张环境,表明该区在燕山早期的中侏罗世即已进入后造山演化阶段。岩石的成因模式为地幔镁铁质岩浆在上升至地壳底部过程中,受到地壳组分的混染,在岩石圈伸展的深部背景和浅部拉张状态下形成。

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