An extremely low U/Pb source in the moon - U-Th-Pb, Sm-Nd, Rb-Sr, and Ar-40/Ar-39 isotopic systematics and age of lunar meteorite Asuka 881757

Details An extremely low U/Pb source in the moon - U-Th-Pb, Sm-Nd, Rb-Sr, and Ar-40/Ar-39 isotopic systematics and age of lunar meteorite Asuka 881757 An extremely low U/Pb source in the moon - U-Th-Pb, Sm-Nd, Rb-Sr, and Ar-40/Ar-39 isotopic systematics and age of lunar meteorite Asuka 881757

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4687m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, p. 4687

Computer Science

21

Lunar Composition, Uranium Isotopes, Meteoritic Composition, Lead Isotopes, Thorium Isotopes, Neodymium Isotopes, Strontium Isotopes, Samarium Isotopes, Rubidium Isotopes

Scientific paper

U-Th-Pb, Sm-Nd, Rb-Sr, and Ar-40/Ar-39 isotopic studies have been undertaken on Asuka 881757, a coarse-grained basaltic lunar meteorite whose chemical composition is close to low-Ti and very low-Ti (VLT) mare basalts. The Pb-Pb internal isochron obtained for acid-leached residues of separated mineral fractions yields an age of 3940 + or - 28 Ma, which is similar to the U-Pb and Th-Pb internal isochron ages. The Sm-Nd data for the mineral separates yield an internal isochron age of 3840 + or - 57 Ma and an initial Nd-143/Nd-144 value of 0.50797 + or - 10. The Rb-Sr data yield an internal isochron age of 3840 + or - 32 Ma and a low initial Sr-87/Sr-86 ratio of 0.69910 + or - 2. The Ar-40/Ar-39 age spectra for a glass fragment and a maskelynitized plagioclase are relatively flat and give a weighted mean plateau age of 3798 + or - 12 Ma. These ages are interpreted as indicating that the basalt crystallized from a melt 3.87 Ga ago (the Sm-Nd age), and that an impact event disturbed the Rb-Sr system and completely reset the K-Ar system at 3.80 Ga. The age span for VLT basalts from different sampling sites suggests that they were erupted over a wide area during an interval of at least around 500 million years.

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