U-Th-Pb and Rb-Sr systematics of Apollo 17 boulder 7 from the North Massif of the Taurus-Littrow valley

Details U-Th-Pb and Rb-Sr systematics of Apollo 17 boulder 7 from the North Massif of the Taurus-Littrow valley U-Th-Pb and Rb-Sr systematics of Apollo 17 boulder 7 from the North Massif of the Taurus-Littrow valley

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..23..445n&link_type=abstract

Earth and Planetary Science Letters, vol. 23, no. 3, Oct. 1974, p. 445-452.

Physics

2

Apollo 11 Flight, Breccia, Lunar Evolution, Lunar Rocks, Radioactive Age Determination, Lead Isotopes, Lunar Geology, Rubidium Isotopes, Strontium Isotopes, Thorium Isotopes, Uranium Isotopes

Scientific paper

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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