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太古宙的多期变质岩构成了波罗的地盾东部元古宙地层的褶皱基底,占据了被现令侵蚀面切割的70％地区。太古宇是由不同时代的数个岩石群构成的(在2600-3500Ma时限范围内)其中包括有白海系、科拉系、卡罗里达系基底杂岩和拉宾杂岩。白海系和科拉系主要是由片麻岩(铝质、斜长石和含闪岩的)和闪岩构成,总厚为5—7公里。在扎曼德拉(Zaimandra)、平克尔—贾维(Pinkel-jarvi)等地麻粒岩
The multi-stage metamorphic rocks of the Archean form the fold basement of Proterozoic strata in the eastern Baltic Shield, occupying 70% of the area cut by the now eroded surface. The Archeology consists of several rock masses from different epochs (within the 2600-3500Ma time frame), including the White Sea, the Corrals, the Carolina basement complexes and the ribin complexes. The White Sea system and the Coora system are mainly composed of gneiss (aluminum, plagioclase and amphibolite) and amphibolite, with a total thickness of 5-7 km. In the granites of Zaimandra, Pinkel-jarvi, etc.