Themes of the Day:

• Classification of Igneous Rocks
• CIPW Norm Calculation

Classification of Igneous Rocks - Plutonic Rocks

• Modal vs. Normative Classification
• The CIPW Norm
• Using Ternary Diagrams
• Wikipedia entry for Ternary Plot
• Commercial Ternary plotting programs
  • PetroPlot
  • Ternary Plot 4.0
  • Delta Plot - freeware - Mac Only
• Igneous Rock Classification - Winter Powerpoint

Classification of Igneous Rocks - Plutonic Rocks

• QAPF Diagram - felsic plutonic rocks
• Simplified Plutonic QAPF - good for field ID
• Mafic Rock Triangles - Plagioclase, Pyroxene, and either Olivine or Hornblende
• Ultramafic Triangle - rocks with < 5% plagioclase

Classification of Igneous Rocks - Volcanic Rocks

• QAPF Diagram - felsic volcanic rocks
• Simplified Volcanic QAPF - good for field ID
• Silica Content and Color Index
• Chemical Classification of Volcanic Rocks
• Harker Variation Diagrams
• AFM Triangle
• Spider Diagrams