Magnesian anorthosites and associated troctolites and dunite in Apollo 14 breccias

Details Magnesian anorthosites and associated troctolites and dunite in Apollo 14 breccias Magnesian anorthosites and associated troctolites and dunite in Apollo 14 breccias

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15...41l&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

Physics

11

Anorthosite, Breccia, Chondrites, Dunite, Lunar Composition, Lunar Rocks, Apollo 14 Flight, Calcium Silicates, Gabbro, Highlands, Magnesium Compounds, Microstructure, Rare Earth Elements, Moon, Samples, Lunar, Magnesium, Anorthosites, Troctolites, Dunite, Apollo 14, Breccias, Composition, Mineralogy, Highlands, Silicate, Rare Earth Elements, Concentration, Abundance, Comparisons, Source, Crystallization, Origin, Formation, Kreep, Metasomatism, Magma

Scientific paper

Magnesian anorthosite, a new type of pristine lunar highlands rock, has been found in Apollo 14 breccias. It has primitive (high Ca and Mg) silicate mineral compositions, and high and variable REE concentrations. Variations in REE contents can be accounted for by variations in modal abundance of REE-rich apatite. Magnesian anorthosites are associated with troctolites and a dunite with very similar mineral compositions and it is suggested that all crystallized from a differentiated troctolitic intrusion. The origin of the REE-rich apatite is enigmatic. It is unlikely to have crystallized from an igneous liquid in equilibrium with the major minerals in the anorthosite. Possible origins are assimilation of urKREEP or metasomatism by REE-rich fluids. REE-rich alkali anorthosites and gabbronorites are also found and are likely to be related to KREEP basalt magmas. Lunar compositional associations are distributed in a regional rather than global manner.

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