Melting Melting Best - Chapter 9, pp. 299-215 Magma Magma Generation Generation • Partial melting – Upper mantle – Deep crust • Magma density • Less than surroundings Ab Ab- An System An System • Melts are enriched in Na & Si • Residual is enriched in Ca & Al Di Di- An System An System • Initial melts have eutectic composition • Residual enriched in end-member composition
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MeltingMelting
Best - Chapter 9, pp. 299-215
Magma Magma GenerationGeneration
• Partial melting
– Upper mantle
– Deep crust
• Magma density
• Less than surroundings
AbAb--An SystemAn System
• Melts are enriched in Na & Si
• Residual is enriched in Ca & Al
DiDi--An SystemAn System
• Initial melts have eutectic composition
• Residual enriched in end-member
composition
FoFo--Q SystemQ System
• Initial melts have eutectic or peritectic composition
• Residual rock is enriched in Fo or Q, depending on the starting composition
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