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在内蒙南部地区,有多数的花崗偉晶岩脉侵入到前震旦紀的片麻岩类或片岩中。由于缺乏地層方面的証据,对于这些花崗偉晶岩的生成时代問題,一直沒有得到很好的解决。
In southern Inner Mongolia, most of the granitic pegmatites intruded into gneiss or schist of Pre-Sinian. Due to lack of evidence of formation, the generation age of these granitic pegmatites has not been well solved.