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South Dike

View on map:36.639722°N 108.826447°W

Comments

There are several dikes that radiate from Shiprock and the largest is South Dike here (5.5 miles long).  Before the neck of Shiprock was exposed by erosion, the magmas created pressure from below expanding the volcano and causing fractures that were filled with lava. 

Description


Dike (geology)

A dike or dyke in geology is a sheet of rock that formed in a crack in a pre-existing rock body. However, when the crack is between the layers in a layered rock, it is called a sill, not a dike. It is a type of tabular intrusion, or sheet intrusion, that either cuts across layers in a planar wall rock structures, or into a layer or unlayered mass of rock.

References

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