Origin of lead from green glass of Apollo 15426 - A search for primitive lunar lead

Details Origin of lead from green glass of Apollo 15426 - A search for primitive lunar lead Origin of lead from green glass of Apollo 15426 - A search for primitive lunar lead

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..361t&link_type=abstract

(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)

Physics

11

Glass, Lead Isotopes, Lunar Composition, Lunar Evolution, Lunar Rocks, Apollo 17 Flight, Lunar Surface, Spherules, Uranium Isotopes

Scientific paper

Green glass from Apollo 15 lunar clod 15426 (collected from the north rim of Spur Crater), known to be the most primitive among sampled lunar volcanic rocks, was analyzed for Pb isotopic compositions and concentrations of U, Th, and Pb. Hand-picked green glass and yellow impact glass particles were washed with water and a mixture of HBr and HF, and the washes and residues, spiked with a mixure of U-233-U-236-Th-230-Pb-205, were subjected to U-Th-Pb analyses. In contrast to the case of the Apollo 17 orange glass, the isotopic composition of lead from the surfaces of the green glass spherules is totally different from that of the spherules' interiors but is similar to the composition of lunar surface lead. Data for the interior lead yield a Pb-207/Pb-206 age of 3.41 Ga. The data indicate that lunar Pb evolved in an environment with U-238/Pb-204 ratios of 19 to 55, which is considerably lower than those for mare basalts (about 300) but higher than the earth values (6-8).

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