Higgins Michael D.. (1996). Magma dynamics beneath Kameni volcano, Thera, Greece, as revealed by crystal size and shape measurements. Journal of Volcanology and Geothermal Research, 70, (1-2), p. 37-48.
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URL officielle: https://doi.org/10.1016/0377-0273(95)00045-3
Résumé
Size distributions of plagioclase crystals in series of recent porphyritic dacite lavas from Kameni volcano, Greece, can be modelled by mixing two populations of crystals, each with overlapping linear crystal size distributions (CSD)—termed microlites and megacrysts. The magmas bearing the microlites and megacrysts started to crystallise 6–13 and 24–96 years, respectively, before each eruption. The dates of initiation of crystallisation of the megacrysts indicate that they are left-overs of earlier injections of new magma into a shallow chamber: some magma remains after each eruption and continues to crystallise. New magma with few or no crystals is then introduced and the microlites crystallise from the mixed magma. Eruption followed 6–13 years after mixing. Such a model would suggest that some porphyritic magmas are products of a shallow magma chamber that is never completely emptied, just topped up from time to time.
Type de document: | Article publié dans une revue avec comité d'évaluation |
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Volume: | 70 |
Numéro: | 1-2 |
Pages: | p. 37-48 |
Version évaluée par les pairs: | Oui |
Date: | Janvier 1996 |
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: | Dynamique du magma, volcan Kameni, Grèce, forme des cristaux, taille des cristaux, Kameni volcano, Greece, crystal size distributions |
Déposé le: | 12 juill. 2018 14:04 |
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Dernière modification: | 12 juill. 2018 14:04 |
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