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地质学报  2011 

来自东南极西福尔丘陵附近冰碛物中沉积岩砾石的碎屑锆石LA-ICP-MSU-Pb年龄及其意义

, PP. 1585-1612

Keywords: 东南极西福尔丘陵,冰碛物,沉积岩砾石,LA-ICP-MSU-Pb年龄

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Abstract:

东南极西福尔丘陵东南侧分布着长约20公里带状冰碛物,这些冰碛物成分复杂,其中含有少量与该地区高级片麻岩的基岩显著不同的沉积岩砾石。根据冰川流动方向可以推测它们来自西福尔丘陵的东南侧的冰盖之下。对其中8个具有代表性的沉积岩砾石样品进行碎屑锆石LA-ICP-MSU-Pb年龄测试,其U-Pb表面年龄主要集中在2410-2600Ma和3340-3500MaMa之间,缺乏1000Ma和500Ma变质年龄,这些信息不仅暗示在西福尔丘陵东南侧存在一个古太古宙陆块,而且,说明该碎屑岩形成于物源区相对较为单一的地区。

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