History of the paired lunar meteorites MAC88104 and MAC88105 derived from noble gas isotopes, radionuclides and some chemical abundances

Details History of the paired lunar meteorites MAC88104 and MAC88105 derived from noble gas isotopes, radionuclides and some chemical abundances History of the paired lunar meteorites MAC88104 and MAC88105 derived from noble gas isotopes, radionuclides and some chemical abundances

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3139e&link_type=abstract

(The MacAlpine Hills Lunar Meteorite Consortium - Lunar and Planetary Science Conference, 21st, Special Session, Houston, TX, Ma

Computer Science

14

Lunar Composition, Lunar Rocks, Meteoritic Composition, Radioactive Isotopes, Rare Gases, Abundance, Breccia, Lunar Atmosphere, Lunar Evolution, Radioactive Age Determination, Solar Wind

Scientific paper

Noble gas isotopes, radionuclides, and chemical abundances were investigated in the MAC88104 and MAC88105 lunar meteorites. The concentrations of the noble gas isotopes and the radionuclide activities in the two meteorites are essentially identical, confirming that the two meteorites are paired. It is suggested that before breccia compaction the MAC88104/105 material resided for 630+/-200 Ma at an average shielding depth of 85g/sq cm. The Ar-40/Ar-36 ratio of the trapped component is 5.7+/-1.0, indicating an intermediate antiquity of the material; it is estimated that the solar wind and lunar atmospheric particles were implanted about 2000 Ma ago. It is found that a terrestrial age is between 0.1-0.6 Ma and the ejection time of MAC88104/5 from the moon is between 0.1-0.8 Ma. The exposure histories of the lunar meteorites indicate that at least two impact events are responsible for their ejection from the moon.

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