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[[File:Anahim Volcanic Belt-en.svg|thumb|right|350px|alt=Map showing the location of an east–west trending zone of related volcanoes extending from the British Columbia Coast to the Interior.|The extent of the [[Anahim Volcanic Belt]], including the Bella Bella and Gale Passage dike swarms]]
The '''Bella Bella and Gale Passage dike swarms''' are two parallel [[dike swarm]]s on the [[British Columbia Coast|Central Coast]] of [[British Columbia]], Canada.<ref name=FG>{{cite book | last = Ernst | first = Richard E.|author2=Kenneth L. Buchan | title = Mantle Plumes: Their Identification Through Time (Special Paper (Geological Society of America))|publisher= [[Geological Society of America]]|date=June 2001|page=261 | isbn = 978-0-8137-2352-5}}<!--|accessdate= 2007-11-17--></ref> They range in age from 14.5&nbsp;to 12.5&nbsp;million years old.<ref name="FG"/><ref>{{cite document|title=The geothermal potential of Nazko Cone, British Columbia|last=Dewit|first=Megan|publisher=[[Simon Fraser University]]|page=4|year=2014}}</ref> They are both chemically [[bimodal volcanism|bimodal]], consisting of rocks such as [[basalt]], [[trachyte]] and [[comendite]]. They form the westernmost extent of the [[Anahim Volcanic Belt]] on [[Athlone Island]], [[Dufferin Island]] and [[Denny Island (Canada)|Denny Island]].<ref name="SI">{{cite journal | doi = 10.1139/e86-091 | last = Souther | first = J. G. | author-link = Jack Souther | title = The western Anahim Belt: root zone of a peralkaline magma system | journal = [[Canadian Journal of Earth Sciences]] | volume = 23 | pages = 895–908 | publisher = [[NRC Research Press]] | year = 1986| issue = 6 | bibcode = 1986CaJES..23..895S }}</ref>

The Bella Bella and Gale Passage dike swarms are [[petrographically]] similar to the [[shield volcano|shield]] complexes in the central Anahim Volcanic Belt. As a result, the swarms are thought to represent the roots of a [[peralkaline]] magma system in which they are the magma conduits connecting the underlying [[magma chamber]] to the volcanic centre at the surface, which has been extensively eroded to remnants of eruptive [[breccia]].<ref name="SI"/>

==References==
{{reflist}}

{{Anahim Volcanic Belt}}

[[Category:Dike swarms]]
[[Category:Anahim Volcanic Belt]]
[[Category:Central Coast of British Columbia]]
[[Category:Miocene volcanism]]
[[Category:Neogene British Columbia]]


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