Rock units are first emplaced either by deposition onto the surface or intrude into the overlying rock.
岩石单位首先由于沉积被储与表面或侵入覆盖的岩层。
Igneous intrusions such as batholiths, laccoliths, dikes, and sills, push upwards into the overlying rock, and crystallize as they intrude.
岩基、岩盖、岩堤、岩席等火成的侵入物向表层岩石推进，并在入侵过程中结晶。
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