PSRD: The Growing Diversity of Lunar Basalts

Supplemental figure for PSRD article The Growing Diversity of Lunar Basalts.

Flow chart illustrating Borg and coauthors' mineral separation procedure for NWA 032.

Mind-boggling separation technique used by Lars Borg and his colleagues to determine Rb-Sr and Sm-Nd ages and initial isotopic compositions of NWA 032. The abbreviations mean: WR, Whole Rock, hence not magnetically separated. UL, unleached (not put into hydrochloric acid). 2L, 4L, Leachate, solutions used in the leaching, with the number representing the strength of the acid, 2 normal or 4 normal. R, residue after leaching. Plag, plagioclase-rich separate. Mafic, separate rich in pyroxene. Ol-1, Ol-2, unleached, hand-picked olivine-rich samples.

Reference:

Borg, L. E., Gaffney, A. M., Shearer, C. K., DePaolo, D. J., Hutcheon, I. D., Owens, T. L., Ramon, E., and Brennecka, G. (2009) Mechanisms for Incompatible-element Enrichment on the Moon Deduced from the Lunar Basaltic Meteorite Northwest Africa 032. Geochimica et Cosmochimica Acta, v. 73, p. 3963-3980.

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