Chapter 5Gautam Sen

Ridge Melting

Ridge vs. Hot spot melting

HydrousMelting

Melt percolation

Compaction & melt accumulation

Compaction height

Di-An-Fo@ different pressures

Composition of invariant melts at different pressures

REEPartitioning

Sm concentration in partial melt

Olivine saturation surface

One can use this diagram to predict the temperature and composition of olivine that would be the first phase to crystallize from mole fractions of FeO and MgO of basaltic liquids. The magma A will crystallize a Fo75 olivine at 1500˚C.

Multisaturation

Multisaturation

Not multisaturated – Composition N

Student needsTo do this

Basalt magma saturated with Ol, Opx, Cpx @ 1 GPa

Older experiments by Stolper showing ol+cpx+opx saturated melts at different pressures

Isotope ratios of basalts from MORB and Hawaii

Primitive Upper Mantle normalized REE in Basalts from Hawaii & MOR