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华北克拉通怀安地区中生代岩体的ID-TIMS U-Pb年龄及构造意义
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摘要
<正>华北克拉通是世界上仅有的4个发现了大于等于3.8Ga陆壳岩石的地区之一,与其它克拉通相比,有更为复杂的多阶段的构造演化,记录了几乎所有的地球早期发展的重大构造事件。中生代期间,华北克拉通尤其是东部块体爆发了大量的岩浆活动,冷的难熔的厚的亏损岩石圈地幔由热的薄的年轻的岩石圈地幔所替代,物理和化学性质发生了根本改变,地球化学、地质年代学及地球物理学数据均表明中生代华北克拉通岩石圈遭受了破坏(朱日祥等,2012)。而相比较于东部地块,华北克拉
引文
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