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12 Cards in this Set
- Front
- Back
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Melting Mechanisms for Divergent Boundaries |
Hydration of the mantle by subducting plate |
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Melting Mechanisms for Subduction Zone |
- Hydration of the mantle by sub ducting plates - Mafic magma melts overlying crusts |
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Melting Mechanisms for Hot Spots |
Hot mantle material rises in cyndricial plume, pressure decrease mafic magma melts overlying crust |
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Magma Types: Divergent Boundaries |
Contentinal Crust: mafic - int. - felsic Between Oceanic Plates: mafic |
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Magma Types: Subduction Zone |
Beneath contentinetal crusts: mafic - int - felsic Beneath oceanic crust: mafic - int |
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Magma Types: Hot spot |
under contentinetal crust: mafic - int- felsic under oceanic - mafic ` |
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Types of Volcanos: Cinder Cones Shield Volcanoes Stratovolcanoes Calderas |
Cinder Cones - mafic, explosive Shield Volcanoes - mafic, non explosive Stratovolcanoes - intermediate, felsic, mixed Calederas - felsic, explosive |
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Cinder Cone: Type of rock? What type of material explodes? |
- mafic - pyroclastic ejecta |
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Shield Volcano How often does it erupt? What kind of lava? Explosive? |
- not often - mafic - not very explosive |
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Stratovolcano What kind of hazards does it have? What kind of magma? Explosive? Examples? |
Lava flows, pyroclastic flows, lahars Intermediate or felsic Frequently explosive, often vicious magma Mt St Helens, Mt Garibaldi, Mt Baker |
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Calderas (supervolcanos) How is it created? Examples |
Created from large, explosive, eruptions of felsic pyroclastic material. The caldera is created when the roof of the magma chamber collapses Yellowstones, Wyoming & Crater lake, Oregon |
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Frequency of eruption: Cinder Cones Shield Volcanoes Stratovolcanoes Calederas |
Frequency Frequent/permanment Frequent Rare |
