与活动带相反,克拉通在最近的六亿年中,也就是从前寒武纪以来内部几乎没有发生过变形。大陆内部这些稳定的部分可分为两个单元,即地盾和地台。象北美加拿大地盾和欧洲北部的波罗的海地盾这样的地盾区,是广阔的前寒武系刚性区,代表了大陆内最稳定的核部。地盾区周围大多为地台区,在地台区中,水平的或轻度倾斜的显生宙沉积物复盖在深部 Contrary to the activity belt, Caratt has experienced almost no internal deformation during the last 600 million years, that is, since the Precambrian period. These stable parts of the interior of the mainland can be divided into two units, namely the shield and the platform. Shields such as the Canadian North Shield in North America and the Baltic Shield in northern Europe are the vast Precambrian rigidities that represent the most stable nucleus in the continent. Most of the ground around the shield area is a platform area. In the platform area, the horizontal or slight tilt of the Phanerozoic sediments cover the deep