Lu-Hf and Sm-Nd evolution in lunar mare basalts

Details Lu-Hf and Sm-Nd evolution in lunar mare basalts Lu-Hf and Sm-Nd evolution in lunar mare basalts

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..459u&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

6

Basalt, Lunar Evolution, Lunar Maria, Lunar Rocks, Rare Earth Elements, Hafnium, Lutetium, Neodymium, Samarium, Tables (Data), Moon, Samples, Lunar, Basalts, Lutetium, Hafnium, Samarium, Neodymium, Evolution, Maria, Isotopic Ratios, Rare Earth Elements, Mare Basalts, Melting, Cumulates, Magma Ocean, Enrichment, Source, Composition, Mineralogy, Comparisons, Samples, Terrestrial, Hypotheses, Mantles, Depletion, Partitioning

Scientific paper

Existing cumulate remelting models for mare basalt genesis are evaluated in light of Lu-Hf, Rb-Sr, Sm-Nd data and overall REE characteristics in order to determine the simplest model that can account for these data. A data base for comparing Lu-Hf evolution in the lunar mantle as inferred from Lu-Hf analyses of oceanic basalts is presented along with a preliminary comparison of Lu-Hf and Sm-Nd evolution betwee mare basalts and terrestrial oceanic basalts. It is found that Lu/Hf characteristics of mare basalts cannot be explained in terms of modal melting of cumulate sources formed from a magma ocean with chondritic Lu/Hf. The data are consistent with a model in which the cumulate sources formed from a light REE + HF-enriched magma ocean. Nonmodal melting of ilmenite in the sources is also required. The Lu-Hf data suggest that even the high-Ti basalt sources contained no more than about 3 percent ilmenite.

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