Magma acide: formation de dômes
Transcript of Magma acide: formation de dômes
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Magma acide: formation de dômes
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Monserrat (Antilles)
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Monserrat (Antilles)
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Monserrat (Antilles)
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Merapi (Indonésie)
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Merapi
(Indonésie)
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St Helens 2006 (USA)
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Province volcanique du Velay
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Pinatubo 1991 (Philipines)
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Formation et évolution
d’une colonne plinienne
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Augustine
(Alaska)
Coulées
pyroclastiques)
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Les caldeiras
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Caldeira du Tengger (Indonésie)
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Caldeira du Tengger (Indonésie)
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Bromo - Caldeira du Tengger
(Indonésie)
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Tungurahua 5023m (Equateur)
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Tungurahua (Equateur)
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Activité sismique et volcanique la plus importante:
Zones de subduction
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Rogers, 2007
Profondeur de la
source des séismes
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Subduction dans le sud
de l’Italie
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Rogers, 2007
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Où vont les plaques subductées ?
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0 500 1000 1500 2000
0
50
100
150
200
250
50
75
25
LIQUIDESOLIDE
+LIQUIDE
SOLIDE
Profondeur
en km
Pressionen kbar
Température °C
Taux
de fusion
Lherzolite à spinelle
Lherzolite à grenat
Lherzolite à plagioclase
Solidus hydraté
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En plus du volcanisme: énormément
de roches plutoniques.
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Importance des minéralisations associées