The metamorphism of the basic dykes emplaced during the Late Archean era reached amphibolito-granulite facies, suggesting a fairly strong reginal metamorphism toke place during this period in eastern Hebei.

• 太古代晚期侵位的基性岩墙变质达角闪麻粒岩相,说明太古代末期冀东地区发生一次较强的区域变质作用。