Melting Winter Chapter 10. Magma Generation Partial melting –Upper mantle –Deep crust Magma density Less than surroundings.

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Presentation transcript:

Melting Winter Chapter 10

Magma Generation Partial melting –Upper mantle –Deep crust Magma density Less than surroundings

MASH Hilderth and Moorbath (1988) Refer to processes that take place beneath continental crust in subduction zones Melting Assimilation Storage Homogenization

Ab-An System Melts are enriched in Na & Si Residual is enriched in Ca & Al

Di-An System Initial melts have eutectic composition Residual enriched in end-member composition

Fo-Q 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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