原地岩体(英语:autochthon)是指一块岩体,位于其原始形成的位置,相对于其基底而言,未经搬移过。[1]移置岩体至少移动了几公里。[2][3]。如果移置岩体有一个开口或洞,暴露出下面的原地岩体,这个洞被称为构造窗[2][3]

逆断层示意图断层上盘称为推覆体,它遮盖底下的原地岩体。推覆体的洞曝露原地岩体,为构造窗,推覆体被侵蚀后留下的山峰,称为飞来峰

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