Kangaamiut dike swarm explained

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 1500NaN0 of the coast and a similar distance up to the inland ice to the east, covering an area of about 18000km2. 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.

Notes and References

1. Book: http://www.geus.dk/publications/bull/nr11/nr11_p061-086.pdf. Mayborn. K.R.. Lesher. C.E.. 2006. Origin and evolution of the Kangâmiut mafic dyke swarm, West Greenland. Garde, A.A. . Kalsbeek, F.. Precambrian crustal evolution and Cretaceous-Palaeogene faulting in West Greenland. Geological Survey of Denmark and Greenland Bulletin. 11 . 61–86.
2. Book: The Evolving Continents: Understanding Processes of Continental Growth . Garde . A.A. . Hollis . J.A. . Geological Society, London . 2010 . 9781862393035 . Kusky . T. M . Special Publications . 338 . 213–234 . A buried Palaeoproterozoic spreading ridge in the northern Nagssugtoqidian orogen, West Greenland . 10.1144/SP338.11 . Zhai . M.-G. . Xiao . W. . 10.1.1.980.1494 .