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Virginia Dale Ring Dike Complex

View on map:40.763053°N 105.181200°W

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Virginia Dale Ring Dike Complex
The ring dike is approximately 15 kilometers in diameter.  The ring dike is 14 billion years old and intrudes metamorphic rocks of 1.8 billion years old.  The ring dike consists of aplitic diorite here at the southern end of the complex.  Stop 10 of EchHawk and Kackstaetter

Description

A ring dike or ring dyke is an intrusive igneous body that is circular, oval or arcuate in plan and has steep contacts. While the widths of ring dikes differ, they can be up to several thousand meters.[2] The most commonly accepted method of ring dike formation is directly related to collapse calderas.[3]

References

  • http://en.wikipedia.org/wiki/Ring dike
  • Page 261 - EchoHawk, B. and Kackstaetter, U., 2016, Roadside faults, folds, fossils, crystals, and diamond pipes - Sampling the geologic diversity of northern Colorado: Geol. Soc. Am. Field Guide 44, p. 247-266.
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