Kangaamiut dike swarm

Summary

The Kangaamiut dike swarm (old spelling: Kangâmiut) is a 2.04 billion year old dike swarm located in the Qeqqata region of western Greenland.[1] The dikes cut Archean orthogneisses and are exposed along approximately 150 km (93 mi) of the coast and a similar distance up to the inland ice to the east, covering an area of about 18,000 km2 (6,900 sq mi). To the north it is bounded by the paleoproterozoic Ikertooq shear zone (old spelling: Ikertôq) while to the south the boundary is gradational with a gradual reduction in the density of dikes. The dike swarm was intruded during a phase of extensional tectonics.[2] They were later deformed during the Nagssugtoqidian orogeny, with the amount of strain increasing towards the Iqertooq shear zone.

References

  1. ^ Mayborn, K.R.; Lesher, C.E. (2006). "Origin and evolution of the Kangâmiut mafic dyke swarm, West Greenland" (PDF). In Garde, A.A.; Kalsbeek, F. (eds.). Precambrian crustal evolution and Cretaceous-Palaeogene faulting in West Greenland. Geological Survey of Denmark and Greenland Bulletin. 11. pp. 61–86.
  2. ^ Garde, A.A.; Hollis, J.A. (2010). "A buried Palaeoproterozoic spreading ridge in the northern Nagssugtoqidian orogen, West Greenland". In Kusky, T. M; Zhai, M.-G.; Xiao, W. (eds.). The Evolving Continents: Understanding Processes of Continental Growth. Special Publications. 338. Geological Society, London. p. 213–234. CiteSeerX 10.1.1.980.1494. doi:10.1144/SP338.11. ISBN 9781862393035.