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The Cascadia megathrust earthquake of 1700 may have rejuvenated an isolated basalt volcano in western Canada: Age and petrographic evidence

Higgins Michael D.. (2009). The Cascadia megathrust earthquake of 1700 may have rejuvenated an isolated basalt volcano in western Canada: Age and petrographic evidence. Journal of Volcanology and Geothermal Research, 179, (1-2), p. 149-156.

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URL officielle: https://doi.org/10.1016/j.jvolgeores.2008.10.016

Résumé

The basaltic Tseax flow is the product of one of only two eruptions in western Canada during the last thousand years. Reinterpretations of 14C and paleomagnetic data indicate that Tseax volcano last erupted between 1668 and 1714 CE. This date straddles that of the Cascadia megathrust earthquake of 26 January 1700, whose rupture lay 450 km to the south. Hence, the largest recent earthquake in northwest North America may have rejuvenated an existing magmatic system and produced this isolated flow. Although the flow is chemically uniform there are significant textural differences between the early and late parts of the flow. It is proposed that both magmatic components were contained within a steep conduit. Gas produced by degassing of magma in the lower part of the conduit ascended, heated magma in the upper part, coarsening plagioclase, and then continued to the surface along fissures. This stable configuration was disrupted by the Cascadia earthquake: dilatation widened the conduit and enabled both magmas to rise to the surface along existing fissures.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:179
Numéro:1-2
Pages:p. 149-156
Version évaluée par les pairs:Oui
Date:15 Janvier 2009
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:DSR, distribution de la taille des cristaux, textures, séisme de Cascadia, grossissement, Colombie-Britannique, Canada, CSDs, crystal size distribution, textures, Cascadia earthquake, coarsening, British Columbia, Canada
Déposé le:12 juill. 2018 12:55
Dernière modification:12 juill. 2018 12:55
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