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Title:
U-Th-Pb and Rb-Sr systematics of Apollo 17 boulder 7 from the North Massif of the Taurus-Littrow valley
Authors:
Nunes, P. D.; Tatsumoto, M.; Unruh, D. M.
Affiliation:
AA(U.S. Geological Survey, Denver, Colo.), AB(U.S. Geological Survey, Denver, Colo.), AC(U.S. Geological Survey, Denver, Colo.)
Publication:
Earth and Planetary Science Letters, vol. 23, no. 3, Oct. 1974, p. 445-452. (E&PSL Homepage)
Publication Date:
10/1974
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
APOLLO 11 FLIGHT, BRECCIA, LUNAR EVOLUTION, LUNAR ROCKS, RADIOACTIVE AGE DETERMINATION, LEAD ISOTOPES, LUNAR GEOLOGY, RUBIDIUM ISOTOPES, STRONTIUM ISOTOPES, THORIUM ISOTOPES, URANIUM ISOTOPES
Comment:
A&AA ID. AAA012.094.806
DOI:
10.1016/0012-821X(74)90134-4
Bibliographic Code:
1974E&PSL..23..445N

Abstract

Portions of highland breccia boulder 7 collected during the Apollo 17 mission were studied using U-Th-Pb and Rb-Sr systematics. A Rb-Sr internal isochron age of 3.89 plus or minus 0.08 b.y. with an initial Sr-87/Sr-86 of 0.69926 plus or minus 0.00008 was obtained for clast 1 (77135,57) (a troctolitic microbreccia). A troctolitic portion of microbreccia clast 77215,37 yielded a U-Pb internal isochron of 3.8 plus or minus 0.2 b.y. and an initial Pb-206/Pb-207 of 0.69. These internal isochron ages are interpreted as reflecting metamorphic events, probably related to impacts, which reset Rb-Sr and U-Pb mineral systems of older rocks.
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