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Dike

Dikes are mostly volcanic intrusions in to a preexisting rock. A dike can also be sedimentary deposits in a preexisting joint. The dike cross-cuts the preexisting rock, and is vertical to near-vertical.

Volcanic dikes appear because of the pressure, stress and deformation in the underground, leading to dikes appearing around the affected area. It is easier to recognize a dike because they cross-cut the geological column.

For both dikes and sills in volcanic rock it applies that they often create columnar joints, due to the cooling process.

Photo showing columnar basalts on the Faroe Islands

Billedet visar kolonne-basalt på Færøerne. (http://www.panoramio.com/photo/55215166)

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