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科学通报  2012 

西阿拉善地块~2.5GaTTG岩石及地质意义

, PP. 2715-2728

Keywords: TTG,2.5,Ga,LA-ICP-MS,Hf同位素,北大山,阿拉善地块,华北克拉通

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Abstract:

阿拉善地块是华北克拉通的一部分,但其是否存在太古代变质基底却存在争议.本文首次报道西阿拉善地块的北大山地区存在新太古代岩石,岩相学和岩石地球化学特征表明这些岩石为花岗闪长质片麻岩,具有典型TTG片麻岩特征.LA-ICP-MS锆石U-Pb定年结果显示,该岩石的岩浆锆石核的年龄为2522±30Ma,变质重结晶边的年龄为2496±11Ma,近一致的岩浆结晶年龄和变质年龄表明它们属于同一构造热事件的产物,代表了北大山地区新太古代末-古元古代早期的岩浆-变质事件;锆石Hf同位素结果显示,eHf(t)值主要集中在0.4~4.9之间,对应的二阶段模式年龄集中于2.7~3.0Ga之间,说明TTG片麻岩的主要源区为形成于中-新太古代(2.7~3.0Ga)的地壳物质,并在新太古代末期发生再造.这些资料显示西阿拉善地块的新太古代TTG片麻岩与广泛分布于华北克拉通的同时代TTG岩石特征一致,它们经历了类似的中-新太古代地壳生长和新太古代末-古元古代最早期的构造热事件.

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