EARTHSC 2GG3 Lecture Notes - Kilauea, Hawaii, Flood Basalt, Lava Dome

• School: McMaster University
• Department: Earth Sciences
• Course: EARTHSC 2GG3
• Professor: Sergei Basik

Document Summary

Higher silica content higher viscosity more explosive. Lower silica content lower viscosity less explosive. Basalt lave = quiet eruptions; most oceanic volcanic and hawaiian made of this. Rhyolite = very explosive, rhyolite domes in yellowstone park; whiteish grey. Ignious = rocks made from volcanic activity; lighter colour. Olivine found in common lava in hawaii. Low viscosity = bubbles formed due to rapid cooling. Lava- magma that flows onto ground surface. Pyroclactic material fragment of solidified magma blown out of volcano, fragments (small and large) may be deposited by pyroclactic density current pdc (hot flow and billowing tephra. Lahar mudslide of volcanic material ; can bury buildings. Pahoehoe flow: basalt lava with a ropy or smooth top ; flows quickly. Aa flow: blocky basalt lava with a ragged, clinker surface. Huge volcanoes, due to low viscosity lava. Eruption below sea level produce volcanoes ; basalt lava flows.