Igneous Rocks and Volcanoes

Igneous Rocks and Volcanoes - Igneous Rocks and Volcanoes...

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Igneous Rocks and Volcanoes
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View From Space - Klyuchevskaya, Russia
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Cleveland Volcano, Alaska
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Mount Etna From Space
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Mount Etna From Space
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Mount Etna From Space
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Mount Etna
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Shiveluch, Russia
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Magma – molten rock beneath the surface Lava – molten rock on the surface
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Igneous Rocks Cool from the Molten State Volcanic -- Erupted on Surface Plutonic -- Solidify Within Earth Large Grain Size ---> Slow Cooling Volcanic Rocks -- Fine Grained Plutonic Rocks -- Coarse Grained Porphyritic Texture: Large Crystals in Fine-grained Setting
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Igneous Rock Classification How Much Silica? (account for Si) Excess - Rock Has Quartz Just Enough to Form Other Silicates Deficient - Silica-Poor Minerals (Like Olivine) What Feldspars? (Account for Al, Ca, K, Na ) Potash Feldspar KAlSi 3 O 8 Plagioclase Series NaAlSi 3 O 8 ...... CaAl 2 Si 2 O 8 What Other Minerals Are Present? (Account for Fe, Mg)
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Feldspars K - Feldspar: KAlSi 3 O 8 Several Slightly Different Forms: Microcline Orthoclase Plagioclase (Solid Solution) • Albite: NaAlSi 3 O 8 • Anorthite: CaAl 2 Si 2 O 8 Any Mixture of the Two Is Possible
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