Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..971n&link_type=abstract
Lunar and Planetary Science, volume 27, page 971
Other
2
Crust: Lunar, Isotopes: Neodymium, Isotopes: Strontium, Meteorites: Lunar
Scientific paper
We have analyzed lunar meteorites QUE93069 (bulk), MAC88105, (clast W1) and Y86032 (matrix and clast) for 87Sr/86Sr and 143Nd/144Nd isotopic ratios, as well as for Rb, Sr, Sm, and Nd concentrations. The maximum 87Rb/86Sr value for the samples is ~0.013 as found for QUE93069. 87Rb/86Sr ratios of these lunar meteorites are less than those of most pristine norites and other Mg-suite rocks, and overlap the range for pristine ferroan anorthosites. The low values of 87Rb/86Sr are consistent with the absence of a KREEP component, as has been concluded from prior geochemical investigations. On a Rb-Sr isochron diagram, the data form a good linear array which is best interpreted as a mixing line.The best fit linear regression has a slope of 0.068, within 3% of that of a reference isochron for a 4.56 Ga age. The ordinate intercept for the best fit line is 87Sr/86Sr = 0.699083 +/- 0.000053, identical within error limits to initial 87Sr/86Sr = 0.699078 +/- 0.000015 erived from data reported for ferroan anorthosite 60025 at ~4.44 Ga. A similar initial 87Sr/86Sr = 0.69907 +/- 0.00002 for pristine norite 78236 at 4.34 Ga (lambda(87Rb) = 0.01402 x 10-11 yr) was reported by . This value of 87Sr/86Sr apparently characterized the lunar crust ~4.4 Ga ago, and is elevated relative to the initial 87Sr/86Sr in angrite meteorites. 147Sm/144Nd and 143Nd/144Nd ratios of the lunar meteorites are nearly identical to those for pristine norites, and lower than values for those ferroan anorthosites for which high precision data have been reported.
Dasch J.
Nyquist Larry E.
Shih Chia-You
Wiesmann Henry
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