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Igneous Rock Notes

Igneous Rock Notes

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Igneous Rock Notes

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  1. Igneous Rock Notes

  2. Igneous rock forms when magma cools and solidifies.

  3. Classification • Composition • Felisc or Mafic • Texture • Intrusive or Extrusive

  4. Classification Granite • Felsic – light colored, less dense • Rich in aluminum, potassium, silicon, and sodium. Rhyolite

  5. Classification Gabbro • Mafic – dark colored, more dense • Rich in calcium, iron, and magnesium Basalt

  6. Texture • Intrusive Igenous Rock – inside Earth’s crust (corase-grained)

  7. Texture • Intrusive Igneous Rock Formations • Pluton: Large, irregular shaped intrusive bodies • Batholiths: The largest of all igneous intrusions • Stocks: Intrusive bodies that are exposed over smaller areas than batholiths • Dikes: Sheetlike intrusions that cut across previous rock units • Laccolith: Sheetlike intrusions that are oriented parallel to previous rock units • Volcanic neck: A column of igneous rock formed when magma hardens with in a vent

  8. Texture • ExtrusiveIgenous Rock – on Earth’s surface (fine-grained)

  9. Texture • Extrusive Igneous Rock Formations • Lava Flow:Formed when lava erupts from a volcano • Fissure: Long cracks in Earth’s crust where lava can flow

  10. Igneous Rock Flow Chart igneous rock rock melts rock cools Slow cooling (coarse-grained) pressure composition temperature Fast cooling (fine-grained)