A magmatic vertical sheet intrusion that has penetrated into a preexisting body of rock.
A solidified near-vertical subsurface magma body that penetrates through one or more layers of preexisting rock bodies or layers (regardless of rock type). The thickness of a dike is much smaller (cm to meters) than the other dimensions (kilometers), forming a sheet-like structure. Similar but lateral intrusions that form between rock layers are called sills ( Magmatic intrusion structure). Dikes per se do not penetrate to the surface, but several landform types may betray their presence. Areal and differential erosion may expose them directly as exhumed dikes. Dike-indicative features are linear or slightly curvilinear over long distances (Head et al. 2006), often appearing in subparallel groups (Korteniemi et al. 2010). They generally cross terrain irrespective of topography (Head et al. 2006). During...
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