Sm-Nd constraints on early lunar differentiation and the evolution of KREEP

Details Sm-Nd constraints on early lunar differentiation and the evolution of KREEP Sm-Nd constraints on early lunar differentiation and the evolution of KREEP

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..45..123c&link_type=abstract

Earth and Planetary Science Letters, vol. 45, no. 1, Oct. 1979, p. 123-132.

Other

17

Abundance, Geochemistry, Geochronology, Lunar Geology, Neodymium Isotopes, Rare Earth Elements, Samarium Isotopes, Lunar Rocks, Mass Spectroscopy, Petrography, Phosphorus, Potassium, Moon, Kreep, Evolution, Basalt, Isotopic Ratios, Chronology, Regolith, Chemistry, Textures, Abundances, Contamination, Siderophile Elements, Impact Basins, Rare Earth Elements, Models, Differentiation, Samarium, Landing Sites, Melting, Solidification, Metamorphism, 15386, 15382, Neodymium, Apollo 15, Age Dating

Scientific paper

The internal Sm-Nd systematics of lunar KREEP basalt 15386 and its implications for the evolutionary history of KREEP on the moon are reported. The age of the 15386 rocklet indicated by the measured Sm-Nd mineral isochron is consistent with the reported Rb-Sr and (Ar-39)-(Ar-40) ages of other KREEP-rich samples, which is interpreted as the time 15386 crystallized from a liquid on or near the lunar surface. This suggests that the eruption of these incompatible element-rich liquids was related to deep impact events during the final bombardment phase of the surface of the moon. It is concluded that the extremely narrow spread of Sm-Nd model ages for these samples around 4.36 AE, and the compatibility of this age with that indicated by the U-Pb and Rb-Sr systems, indicate that the source of later KREEP volcanism was produced in the closing stages of an early global scale lunar differentiation episode.

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