柴北缘的变质基底具有复杂的岩石组成,除成因迥异的多期变质深成侵入体外,还包括变质程度不同的表壳岩。南带的沙柳河、鱼卡河等地出露大理岩、石英岩、含石榴石片岩和条带状斜长角闪岩等以副变质岩为主的表壳岩系,共同构成了中元古界沙柳河岩群;而出露在北带全吉山、德令哈等地的中高级变质表壳岩系,则为形成于古元古代并具有较强的钾质混合岩化的达肯大坂岩群。柴北缘的榴辉岩分布在南带,除以规模较小的透镜体状赋存于新元古代花岗片麻岩中外,还和沙柳河岩群共生,但在北带的达肯大坂岩群中没有出现。全吉群的时代为南华纪至震旦纪。 The metamorphic basement in the north margin of Qaidam Basin has complex rock composition. Except for the multi-stage metamorphic intrusions with very different genesis, the metamorphic basement rocks with different degrees of metamorphism are also included. Southern Liu Shaliu, Yuka and other places exposed marble, quartzite, with garnet schist and strip amphibolite amphibolite-based case rock series, together constitute the yuan Paleogene Shalihe Group; and exposed in the northern part of the All-Kyrgyzstan, Delhi and other places of high-grade metamorphic crustal rocks, it is formed in the Paleoproterozoic and has a strong potassic Kanyan Dakken Osaka Rock Group. The eclogites located in the north margin of the Qaidam distribute in the southern belt and are interbedded with the Shaliuhe rock mass, except for the smaller lenticular shape that occurs in the Neoproterozoic granitic gneiss. However, in the northern part of the Da Ken Rock Group Did not appear. Ji Jiqun era of the South China Sea to the Sinian.