ch12_Volcanoes_online_notes

ch12_Volcanoes_online_notes - steep-slopes (Cinder-cone...

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VOLCANISM Mount St. Helens, 1980 eruption
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Where are volcanoes located?
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Volcanoes are located over divergent plate boundaries  (mid-oceanic ridges)
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Laki fissure,  Iceland
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Volcanoes are located over convergent plate boundaries  (subduction zones)
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Mount Rainier, Tacoma, Washington
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Volcanoes are located over Hot spots
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What are the products of volcanism?
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Welded tuff  (ash & flow deposits)
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Vesicular Basalt
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Pyroclastic eruption at Arenal  Volcano, Costa Rica
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Volcanic Bombs
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Pyroclastic flow at  Mount Unzen
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Volcanic Breccia
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WHY DO DIFFERENT  VOLCANOES HAVE  DIFFERENT SHAPES?
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Gentle-slopes (Shield Volcano)
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Gentle-slopes (Shield Volcano) Non-explosive eruptions Basaltic flows   Low-viscosity Lava Low SiO 2  content Mafic composition
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steep-slopes (Cinder-cone Volcano)
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Pyroclastic material   High SiO 2  content More Felsic composition
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Unformatted text preview: steep-slopes (Cinder-cone Volcano) steep-slopes (Composite Volcano) Alternating layers of Basaltic flows and pyroclastic material Mafic-felsic composition steep-slopes (Composite Volcano) Volcanic domes Felsic lava Very high viscosity Lava accumulates over the vent Volcanic domes Evolution of Crater Lake Caldera Mount St. Helens (Before eruption) Mount St. Helens (During eruption) Mount St. Helens (After eruption) Mount St. Helens (Before eruption) Hot Spots and Plate movement Hot-spot volcanoes are composed of lavas that 1. Are rich in silica, viscous and explosive 2. Are rich in silica, fluid and explosive 3. Are poor in silica, fluid and not as explosive as convergent margin volcanoes Volcanic Hazards Pyroclastic Flows are the most dangerous...
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ch12_Volcanoes_online_notes - steep-slopes (Cinder-cone...

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