Dike swarms may extend over 400 km (250 mi) in width and length. The largest dike swarm known on Earth is the Mackenzie dike swarm in the western half of the Canadian Shield in Canada, which is more than 500 km (310 mi) wide and 3,000 km (1,900 mi) long.
About 25 giant dike swarms are known on Earth. The primary geometry of most giant dike swarms is poorly known due to their old age and subsequent tectonic activity.
^Re. Iceland see eg.: A. Gudmundsson: Emplacement and arrest of sheets and dykes in central volcanoes. Journal of Volcanology and Geothermal Research 116 (2002) 279^298 Retrieved 31 August 2020.
^"Mackenzie dike swarm". Britannica Online Encyclopedia. geological feature, Canada.
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^Larson, E. E.; Strangway, D. W. (1 March 1969). "Magnetization of the Spanish Peaks Dike Swarm, Colorado, and Shiprock Dike, New Mexico". Journal of Geophysical Research. 74 (6): 1505–1514. Bibcode:1969JGR....74.1505L. doi:10.1029/JB074i006p01505.
^Druecker, M.D.; Gay, S.P., Jr., Mafic dyke swarms associated with Mesozoic rifting in eastern Paraguay, South America[full citation needed]