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通过变质矿物及岩石学的特征确定出山东诸城地区含有榴辉岩块体的片麻岩经历了榴辉岩相到绿帘角闪岩相、绿片岩相的退变质过程。证据有:(1)在榴辉岩块体的边缘片麻岩与榴辉岩呈1-2cm宽的条带状相间排列;(2)硅质片岩中出现Ky-Zo-Q的高压矿物组合;(3)钠长石的矿物晶体内出现硬玉质辉石的残留体;(4)出现高度富Si的多硅白云母(Si=3.55);(5)镁钠闪石及与其共生的暗硬玉(Jd=21)的出现。
Through the characteristics of metamorphic minerals and petrology, the gneisses with eclogite blocks in Zhucheng area of Shandong Province have been experiencing retrograde metamorphism of eclogite facies to epidhase facies and greenschist facies. The evidence is as follows: (1) Gneiss with eclogite 1-2cm wide at the margins of the eclogite block is arranged in a strip-like pattern; (2) a high pressure mineral assemblage of Ky-Zo-Q appears in siliceous schist ; (3) the remains of hard jadeite in the mineral crystals of albite; (4) the presence of highly Si rich muscovite mica (Si = 3.55); (5) magadiite and its symbiotic dark The appearance of jadeite (Jd = 21).