Magma Generation - University at Buffalo · 2001. 3. 20. · Magma Generation • Partial melting...

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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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Page 1: Magma Generation - University at Buffalo · 2001. 3. 20. · Magma Generation • Partial melting – Upper mantle – Deep crust • Magma density • Less than surroundings Ab-An

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

Page 2: Magma Generation - University at Buffalo · 2001. 3. 20. · Magma Generation • Partial melting – Upper mantle – Deep crust • Magma density • Less than surroundings Ab-An

FoFo--Q SystemQ System

• Initial melts have eutectic or peritectic composition

• Residual rock is enriched in Fo or Q, depending on the starting composition

Magma Generation - University at Buffalo · 2001. 3. 20. · Magma Generation • Partial melting...

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