Lunar anorthosites and the magma ocean concept
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Lunar Anorthosites and the Magma Ocean Concept. 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. Anorthosite 62236.

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Lunar anorthosites and the magma ocean concept
Lunar Anorthosites and the Magma Ocean Concept

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.

Anorthosite 62236

How? Measure concentrations of trace elements in individual minerals.

COSMOCHEMISTRY iLLUSTRATED


Ree in plagioclase
REE in Plagioclase

COSMOCHEMISTRY iLLUSTRATED


Distribution coefficient
Distribution Coefficient

CS is the concentration of an element in the solid (mineral).

CL is the concentration of an element in the liquid (magma).

  • Incompatible elements have D << 1

  • Compatible elements have D >> 1

COSMOCHEMISTRY iLLUSTRATED

Lunar Anorthosite Parent Magma


Ree in parent magmas
REE in Parent Magmas

COSMOCHEMISTRY iLLUSTRATED


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