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Understanding Igneous Rocks Formation and Classification

Learn about the formation of igneous rocks, their textures, Bowen’s Reaction series, and how to identify them using hand samples and thin sections. Explore the classification scheme, intrusive and extrusive equivalents, and minerals visible under petrographic microscopes.

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Understanding Igneous Rocks Formation and Classification

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Presentation Transcript

  1. After 7.5 mins, 1st P wave arrived at New York

  2. EAS 220 Lab 4: Igneous Rocks

  3. Today’s Lab • 3 Parts: • Introduction • How igneous rocks form • textures • Bowen’s Reaction series • Igneous Rock Identification • Hand samples • Thin sections

  4. Formation of Igneous Rocks

  5. Textures • Aphanitic • Phaneritic • Porphyritic • Vesicular • Glassy

  6. Aphanitic

  7. Phaneritic

  8. Porphyritic

  9. Vesicular

  10. Glassy

  11. Bowen’s Reaction Series

  12. Classification Scheme

  13. Intrusive Rocks and Extrusive Equivalents

  14. Petrographic Microscopes: Minerals in thin section

  15. Minerals Quartz Biotite • Quartz • Feldspars • Micas • Pyroxene • Olivine • Hornblende Muscovite Olivine

  16. Quartz

  17. Feldspar

  18. Muscovite/Biotite

  19. Pyroxenes

  20. Olivine

  21. Hornblende (Amphibole)

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