Large geological structure consisting parallel, linear, or radially oriented magmatic dikes
Magmatic dikes radiating from West Spanish Peak, Colorado, USView of the Kattsund-Koster dyke swarm in the Koster Islands, western SwedenMap of the Mackenzie dike swarm in CanadaMap of the Matachewan and Mistassini dike swarms in CanadaDike swarms of Caldera de Taburiente, La Palma, SpainHeavily altered dike swarm of the Torfajökull caldera near Landmannalaugar, Iceland
A dike swarm (American spelling) or dyke swarm (British spelling) is a large geological structure consisting of a major group of parallel, linear, or radially oriented magmatic dikes intruded within continental crust or central volcanoes in rift zones. Examples exist in Iceland[1] and near other large volcanoes, (stratovolcanoes, calderas, shield volcanoes and other fissure systems) around the world. They consist of several to hundreds of dikes emplaced more or less contemporaneously during a single intrusive event, are magmatic and stratigraphic, and may form a large igneous province.
The occurrence of mafic dike swarms in Archean and Paleoproterozoic terrains is often cited as evidence for mantle plume activity associated with abnormally high mantle potential temperatures.
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.[2]
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.
Dike swarms have also been found on Venus and Mars.[3][4]
Sedimentary clastic dike swarms also exist on Earth; for example in Chile.[5]
^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.
^Galgana, Gerald A.; Grosfils, Eric B.; McGovern, Patrick J. (2013). "Radial dike formation on Venus: Insights from models of uplift, flexure and magmatism". Icarus. 225 (1): 538–547. Bibcode:2013Icar..225..538G. doi:10.1016/j.icarus.2013.04.020.
^Ernst, R.E.; Grosfils, E.B.; Mège, D. (2001). "Giant Dike Swarms: Earth, Venus, and Mars". Annual Review of Earth and Planetary Sciences. 29: 489–534. Bibcode:2001AREPS..29..489E. CiteSeerX 10.1.1.473.1821. doi:10.1146/annurev.earth.29.1.489.
^Winslow, M.A. (1983). "Clastic dike swarms and the structural evolution of the foreland fold and thrust belt of the southern Andes". GSA Bulletin. 94 (9): 1073–1080. Bibcode:1983GSAB...94.1073W. doi:10.1130/0016-7606(1983)94<1073:CDSATS>2.0.CO;2.
A dikeswarm (American spelling) or dyke swarm (British spelling) is a large geological structure consisting of a major group of parallel, linear, or radially...
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surface as flows froze in conduits as dikes and volcanic plugs and large amounts spread laterally to form sills. Dikeswarms extended across the British Isles...
570 Mya and traces of this breakup can still be found in the Franklin dikeswarm in northern Canada and the Aldan Shield in Siberia. The Proto-Pacific...
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