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Diversification of magmas

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  1. Diversification of magmas Chapter 12

  2. What happens to a magma once melted? • Magmatic differentiation: any process by which a magma changes composition • Most common: • Crystal-melt fractionation • Assimilation of a contaminant • Mixing of magmas

  3. Chemical evidence of differentiation • Magma B has A added to it, result in hybrid magma C • Magma B has A removed from it, residual magma R

  4. Variation diagram of lavas in Kilauea • Samples are circles • Composition of olivine • Where is primary magma comp.? • Where is evolved/differentiated magma comp.?

  5. Crystal melt fractionation • Gravitational segregation of early minerals • M&M magma chamber experiment