Diversification of magmas Chapter 12
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
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
Variation diagram of lavas in Kilauea • Samples are circles • Composition of olivine • Where is primary magma comp.? • Where is evolved/differentiated magma comp.?
Crystal melt fractionation • Gravitational segregation of early minerals • M&M magma chamber experiment