Comment se forme le dôme du volcan ?
Le dôme volcanique est le résultat de la lente extrusion de lave épaisse, visqueuse, souvent riche en gaz, qui donne une morphologie en dôme résultant généralement de la superposition de lobes successifs en sommet de colonne de magma. La viscosité de la lave dépend de sa température et de sa composition chimique.
Comment accéder au puy de Dôme ?
Pour monter au puy de Dôme, les plus courageux peuvent le faire à pied par le chemin des Muletiers ! Sinon, vous pouvez embarquer à bord du Panoramique des Dômes avec une vue à 360° lors de la montée. En une dizaine de minutes, vous êtes au sommet du puy de Dôme.
What is the definition of dome volcano?
- A dome volcano is a round shaped mountain made of viscous lava. The lava has a high silica content that prevents the lava from flowing very far from its vent. Most domes are formed by dacite and rhyolite lavas.
How do dome volcanoes form?
- A dome volcano is small and often forms inside the caldera of a stratovolcano. After a large eruption when large amount of magma has emptied out of the magma chamber the summit of the composite volcano collapses forming a depression. Inside the depression magma oozes out to begin forming a small lava dome.
What is the definition of volcanic dome?
- Volcanic dome, also called Lava Dome, any steep-sided mound that is formed when lava reaching the Earth’s surface is so viscous that it cannot flow away readily and accumulates around the vent.
What are some famous lava dome volcanoes?
- Novarupta volcano in Alaska formed a lava dome over its vent after it erupted in 1912. It was the largest eruption that occurred in the 20th Century. Mount Lassen is the southernmost active volcano in the Cascade Range . It is also one of the largest lava domes in the world.
