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Origin of lead from green glass of Apollo 15426 - A search for primitive lunar leadGreen 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).
Document ID
19870046783
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tatsumoto, Mitsunobu
(Geological Survey Denver, CO, United States)
Premo, Wayne R.
(Geological Survey Denver, CO, United States)
Unruh, Daniel M.
(USGS Denver, CO, United States)
Date Acquired
August 13, 2013
Publication Date
March 30, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
87A34057
Funding Number(s)
CONTRACT_GRANT: NASA ORDER T-783-H
Distribution Limits
Public
Copyright
Other

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