GEO1003 Spring2006 Lecture 10 TwoComponent Phase Diagrams

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GEO1003 Spring2006 Lecture 10 (Two-Component
Phase Diagrams)
Must read ch6 (esp p96-104 in text book)!
Two-Component (Binary) Phase Diagrams
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Two-Component (Binary) Phase Diagrams
Introduction

• In last class we looked at a simple two-component
  phase diagram with complete
• solid solution
• In this class we will explore crystallization and
  melting in
• three two-component diagrams (same ones in ch6 of
  textbook!)
• Two-component with eutectic (Diopside-Anorthite
  system)
• Two component with peritectic (Forsterite-silica
  system)
• Two-component system with exsolution (Alkali
  feldspar system)
• In next class we will explore effects of FC and
  partial melting on these diagrams,
• and also introduce three-component diagrams
• Eutectic invariant point, T minimum on liquidus
• Peritectic invariant point, not a T minimum, to
  cool further one phase must be destroyed

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