1. Lunar Anorthosite Parent Magma COSMOCHEMISTRY iLLUSTRATED Lunar Anorthosites and the Magma Ocean Concept Anorthosite 62236 Lunar anorthosites are thought to have crystallized in a global magma system to form the primary lunar crust. Its crystallization can be tracked by assessing the composition of the magma. How? Measure concentrations of trace elements in individual minerals.

2. Lunar Anorthosite Parent Magma COSMOCHEMISTRY iLLUSTRATED REE in Plagioclase

3. COSMOCHEMISTRY iLLUSTRATED Distribution Coefficient C S is the concentration of an element in the solid (mineral). C L is the concentration of an element in the liquid (magma). Incompatible elements have D << 1 Compatible elements have D >> 1 Lunar Anorthosite Parent Magma

4. COSMOCHEMISTRY iLLUSTRATED REE in Parent Magmas