| 词条 | Bella Bella and Gale Passage dike swarms |
| 释义 |
The Bella Bella and Gale Passage dike swarms are two parallel dike swarms on the Central Coast of British Columbia, Canada.[1] They range in age from 14.5 to 12.5 million years old.[1][2] They are both chemically 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.[3] The Bella Bella and Gale Passage dike swarms are petrographically similar to the 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.[3] References1. ^1 {{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}} {{Anahim Volcanic Belt}}{{BritishColumbiaCoast-geo-stub}}{{Canada-geology-stub}}2. ^{{cite paper|title=The geothermal potential of Nazko Cone, British Columbia|last=Dewit|first=Megan|publisher=Simon Fraser University|page=4|year=2014}} 3. ^1 {{cite journal | doi = 10.1139/e86-091 | last = Souther | first = J. G. | title = The western Anahim Belt: root zone of a peralkaline magma system | journal = Canadian Journal of Earth Sciences | volume = 23 | issue = | pages = 895, 900, 902, 904, 907 | publisher = NRC Research Press | year = 1986}} 4 : Dike swarms|Anahim Volcanic Belt|Central Coast of British Columbia|Miocene volcanism |
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