outcrop of basement rocks 基岩出露
basement rocks of the basin 盆地基底
basement metamorphic rocks 基底变质岩
old metamorphic rocks basement 古老变质岩基底
The basement rocks are mainly TTG rocks with minor granites.
基底岩石中以TT G质岩石为主，少量为花岗质岩石。
Precambrian rocks are described as "basement rocks" because they are usually buried deep under the surface.
前寒武纪岩石被称为基岩，因为它们通常深埋于地表之下。
The Kongling Complex consists of basement rocks, supracrustal rocks and some mafic rocks occurring as lenses, boudins or layers.
崆岭杂岩由基底岩石加表壳岩石组成，另外有一些基性岩侵入其中。
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