A ring dike or ring dyke in geology refers to an intrusive igneous body. Their chemistry, petrology and field appearance precisely match those of dikes or sill, but their concentric or radial geometric distribution around a centre of volcanic activity indicates their volcanic origins.
Notable examples
- One of the best exposed and studied ring dikes is the Loch Bà ring dike, Isle of Mull, Scotland.[1]
- The ring dikes in the Pawtuckaway State Park and the Ossipee Mountains of New Hampshire.[1]
- The Pilanesberg National Park in the North West Province of South Africa is a great example.
See also
- Batholith
- Fissure vent
- Laccolith
- Runamo, formerly interpreted as a runic inscription.
References
- ^ a b Hall, Anthony, Igneous Petrology, Longman, 1987 p.75 - 78 ISBN 0-582-30174-2
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