下构造层有巨厚的、强烈褶皱的变质岩和岩浆岩组成的复杂岩系，通常称为结晶基底或褶皱基底。
结晶基底(Crystalline basement)：强变质-AnЄ b.褶皱基底（Fold basement)：轻微变质-Pz 与区域大地构造研究相同; c.
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大红山岩群是扬子陆块西南缘的结晶基底。
Dahongshan Rock Group is the crystalline basement in the SW margin of the Yangzi Landmass.
宝音图群为陆缘拉张解体阶段源自结晶基底的裂解古陆块。
Baoyintu Group is recognized as an ancient fragment from crystalline basement in stage of continental margin disjoined.
伊犁中天山区出露早元古代变质结晶基底及晚期地台型稳定盖层。
The early Proterozoic metamorphic crystalline basement and the late stable platform covers are exposed in the Yili-central Tisnshan region.
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