华北埃达克质岩与克拉通破坏:实验岩石学和地球化学依据

被引:43
作者
熊小林
刘星成
朱志敏
李元
肖万生
宋茂双
张生
吴金花
机构
[1] 中国科学院广州地球化学研究所
基金
国家自然科学基金重大研究计划;
关键词
埃达克质岩; 华北克拉通; 地壳减薄; 金红石; 实验岩石学;
D O I
暂无
中图分类号
P542 [构造运动];
学科分类号
070904 ;
摘要
华北埃达克质花岗岩和火山岩与岩石圈减薄时空一致性使得它们成为窥视克拉通破坏过程和机制的一个重要窗口.本文通过实验岩石学资料限定华北埃达克质岩石的主要源区岩石为中钾和高钾基性变质岩,并通过基性变质岩体系相平衡、长英质熔体TiO2溶解度、埃达克质岩石Nb/La随La/Yb变化规律等研究论证大别、胶东和克拉通北缘许多埃达克质岩石的源区存在残留金红石,岩浆形成深度超过50km,从而揭示华北克拉通破坏涉及超过15km的地壳厚度减薄或下地壳拆沉.
引用
收藏
页码:654 / 667
页数:14
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