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Fuji

Kao. Fuji. Mayan. Bali. Pinatubo. Pinatubo. Stratovolcanoes. Cinder Cones. Gas Content. Fountains: shields and plateaus. Domes. Viscosity. Classification of Igneous Rocks.

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Fuji

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  1. Kao Fuji Mayan

  2. Bali

  3. Pinatubo

  4. Pinatubo

  5. Stratovolcanoes Cinder Cones Gas Content Fountains: shields and plateaus Domes Viscosity

  6. Classification of Igneous Rocks Figure 2-5. Classification of the pyroclastic rocks. a.Based on type of material. After Pettijohn (1975) Sedimentary Rocks, Harper & Row, and Schmid (1981) Geology, 9, 40-43. b.Based on the size of the material. After Fisher (1966) Earth Sci. Rev., 1, 287-298.

  7. FeO , MgO, CaO Wt. % oxides Na2O, K2O H2O 45 75 Wt. % SiO2

  8. Water Saturation Exsolution of a vapor Water content (wt. %) of a magma Basalt Andesite Rhyolite Composition

  9. Fractional Crystallization Basalt Andesite Rhyolite low H2O Explosive volcanism ? 50 % SiO2 75% SiO2 Water content of a rhyolitic magma ????

  10. Mt. St. Helens

  11. Granites

  12. Origin of Andesites • Fractional crystallization of basaltic magma • Contamination of basaltic magma by continental crust • Both of the above • Partial melting of “special (wet ?) manlte”

  13. Origin of Granite/ Rhyolite • Fractional crystallization of basaltic magma ( volume problem for some areas) • Partial melting of continental crust

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