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地球学报  2004 

小兴安岭东部清水岩体的锆石激光探针U-Pb年龄测定

Keywords: LA-ICPMS,锆石U-Pb年龄,A型花岗岩,清水岩体,东北

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Abstract:

本文应用锆石激光剥蚀等离子质谱(LAICPMS)定年技术,测得小兴安岭东部清水岩体的侵位年龄为222±5Ma。岩石学和地球化学研究显示,该岩体为过碱性A型花岗岩,属于A2型或PA型,形成于造山后构造环境,与华北板块和西伯利亚板块在二叠纪末期碰撞拼合后的岩石圈伸展作用有关。

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