镜下鉴定和激光拉曼测试结果表明预先导孔（CCSD-PP2）第一段榴闪岩的主要矿物为角闪石、石榴石、黑云母和钠长石，是榴辉岩退变质作用的产物。
The main mineral assemblage of the garnet-amphibolite from the first part in CCSD-PP2 is amphibole, garnet, biotite and albite, which resulted from retrograde metamorphism.
详细的岩相学研究表明，TTG岩类中存在岩浆结晶的绿帘石、角闪石和黑云母等。
The petrographical facies studies indicate that the magma-crystallined epidotes , bornblendesand biotites were distributed in TTG rocks.
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