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Titre : | Relation entre la viscosité des laves et la mise en place des écoulements dans un système chenalisé, dans le contexte de l'Etna (Sicile) |
Auteurs : | Romain MARCHAIS ; Simon BERQUEZ ; Simon BERQUEZ |
Type de document : | Mémoire d'initiation à la recherche |
Année de publication : | 2018 |
Concepts : |
CALDEIRA
DYKE SUBDUCTION |
Résumé : | Mt Etna is one of the most active volcanoes in the world, it is located in Eastern Sicily, in an area that is characterized by the presence of a subduction of the African plate under the Eurasian plate. It is in this context that several volcanoes were formed, like the Aeolian Islands or the Vesuvius. However Mt Etna is an anomaly: being too close to the subduction pit, its feeding method cannot be explained by the association of magmatic lifts because of the subduction. Several models are suggested for the creation of Mt Etna. The most probable hypotheses are: the establishment of a hot spot through the subduction plate, networks of faults linked to an old passive margin that are reactivated, or a zone in depression, due to the tectonic, bringing the rock deep to partially melt. Mt Etna is what could be called a laboratory volcano; understanding the flow mechanisms is essential to prevent accidents on highly populated areas near volcanoes, and Etna is ideal for this exercise. In this research paper, the aim is to observe the morphological and chemical behaviours of the flows. Within the flows, the morphological differences in width, height, levees and appearance of the lava were observed and recorded. By coupling this information with the altimetric variations and those of the composition, it makes it possible to highlight the impact of the factors surrounding the casting during its setting up. |
Spécialité : | Géologie |
Numéro de promo : | 80 |
numéro MIR : | 798 |