6. Mafic Intermediate Felsic

7. - The mantle is made up of peridotite (ultramafic composition) - So why/how do we end up with so many different magma compositions?

9. Textbook Figure 6.6a Bowen’s Reaction Series

10. Obsidian (felsic) -extrusive - cooled very quickly above surface - “glassy” texture Granite (felsic) - intrusive – cooled slowly below surface - “phaneritic” texture – mineral crystals are visibl e Rhyolite (felsic) - extrusive – cooled above surface - “aphanitic” texture – mineral crystals are not visible to eye IGNEOUS ROCK TEXTURES

11. Magma composition…. So what minerals are in a: Felsic rock? Intermediate rock? Mafic rock?

13. Granite (felsic) – Intrusive – phaneritic texture Rhyolite (felsic) – extrusive – aphanitic texture Similar felsic composition, different cooling history

14. Diorite – intrusive – phaneritic texture Andesite – extrusive – aphanitic texture Similar intermediate composition, different cooling history

15. Gabbro – intrusive – phaneritic texture Basalt – extrusive – aphanitic texture Similar mafic composition, different cooling history

17. Page 177 Stock sized body

18. Textbook Figure 6.11a Dike

19. Textbook Figure 6.11 b and c