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河南桐柏龟山组由一套绿片岩相至角闪岩相的变质岩系组成，主要岩性为二云石英片岩、斜长角闪片岩、白云质大理岩及硅质岩。根据龟山组稀土元素和微量元素的研究，认为其原岩为基性火山岩、火山碎屑岩及砂泥质沉积岩；该组岩石形成于过渡壳性质的弧后盆地环境，为一套有利于成矿的火山沉积建造。
The Guishan Formation in Tongbai, Henan Province is composed of a metamorphic series of greenschist facies to amphibolite facies. The main lithologies are dolomitic quartz schist, plagioclase amphibolite, dolomitic marble and chert. According to the study of rare earth elements and trace elements in Guishan Formation, the original rocks are considered as basic volcanic rocks, volcaniclastic rocks and sandy muddy sedimentary rocks. The rocks formed in the back-arc basin environment of transitional shell are a set of favorable Metallogenic volcano sedimentary construction.