Basalt fan structure

Short description: Formation of columnar jointed igneous rock

Columnar basalt at Suðurárhraun

A basalt fan structure is a basalt formation composed of columnar jointed basalt columns that have slumped into a fan shape.[1]

Such formations are most likely created when basalt lava is intruded into a soft material, such as loose volcanic ash, which is unable to support the intrusion. As the basalt cools and forms columns, the ash collapses, causing the lava spread and form a fan shape. The formations can be vertical or any degree of horizontal.[citation needed]

## References

1. ↑ Faust, George T.. "Joint Systems in the Watchung Basalt Flows, New Jersey". Geological Survey Professional Paper 864-B. United States Government Printing Office. http://pubs.usgs.gov/pp/0864b/report.pdf. Retrieved 17 December 2019.

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