Lunar initial Nd-143/Nd-144 - Differential evolution of the lunar crust and mantle

Details Lunar initial Nd-143/Nd-144 - Differential evolution of the lunar crust and mantle Lunar initial Nd-143/Nd-144 - Differential evolution of the lunar crust and mantle

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..39..349l&link_type=abstract

Earth and Planetary Science Letters, vol. 39, no. 3, May 1978, p. 349-357.

Computer Science

51

Chondrites, Lunar Crust, Lunar Evolution, Lunar Mantle, Neodymium Isotopes, Apollo 15 Flight, Meteoritic Composition, Samarium Isotopes, Samples, Lunar, Chondrites, Apollo 17, Apollo 11, Green Glasses, Moon, Crust, Mantle, Neodymium, Apollo 15, Origin, Evolution, Mare Basalts, Samarium, 15426, 15382, 14307

Scientific paper

The Sm-Nd evolution of Apollo 15 green glass is discussed. The ICE age (intercept with chondritic evolution) of 3.8 + or - 0.4 eons overlaps the range of reported (Ar-39)-(Ar-40) ages and implies a distinct source region for green glass, characterized by very low and unfractionated REE abundances. Evidence is presented that LINd (lunar initial Nd) is compatible with a 'chondritic'-type Nd isotopic evolution as observed in the Juvinas meteorite. This normalization is used to study the Sm-Nd system of various lunar rock types. The results obtained from a limited number of rocks clearly indicate differential Sm-Nd evolution for the lunar crust and mantle. High-Ti basalts returned by the Apollo 11 and 17 missions were derived from distinct source regions. The Nd-143 evolution in KREEP requires a source region which is clearly distinct from any mantle reservoir.

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