There is clear feature of zonations in Si, Fe, Mg and Mg/(Mg + Fe) for amphibole in Archaean tonalitic gneisses in Malanyu area, eastern Hebei Province.

• 冀东马兰峪地区出露较大面积的太古宙含紫苏辉石的英云闪长质片麻岩,其中角闪石矿物的Si、Fe、Mg、Mg/(Mg+Fe)等呈明显的环带特点。