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五台山区太古宙/元古宙界线划分及其地球演化意义

, PP. 409-418

Keywords: 太古宙/元古宙界线,绿岩带,前陆盆地,大陆裂解,五台山

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Abstract:

太古宙/元古宙界线代表地球演化历史上的重大事件,如何准确标定和划分这一界线对认识早期演化历史具有重要意义。区域构造及同位素地质年代学研究表明,华北克拉通新太古代构造演化明显滞后于欧美澳等克拉通,成为有利于建立太古宙/元古宙界线的关键地区。山西五台山区保留了较完整的新太古代-古元古代地层记录。先前研究主要依据该区地层、区域构造、叠层石记录进行界线划分,并对界线争议较多。本文在五台山区长期野外研究的基础上,通过对磨拉石沉积、同构造花岗岩、裂解环境相关玄武岩的综合探讨,建议这一界线划分在东冶亚群与豆村亚群之间。初步的同位素年龄制约表明,这一界线的时代介于2549±22Ma到2450±10Ma之间,与早期大陆克拉通伸展裂解、隆升剥蚀相关,并涉及岩石圈、水圈、大气圈性质的重大变化。

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