Neodymium Isotope Evidence for a Chondritic Composition of the Moon

Details Neodymium Isotope Evidence for a Chondritic Composition of the Moon Neodymium Isotope Evidence for a Chondritic Composition of the Moon

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sci...312.1369r&link_type=abstract

Science, Volume 312, Issue 5778, pp. 1369-1372 (2006).

Computer Science

26

Scientific paper

Samarium-neodymium isotope data for six lunar basalts show that the bulk Moon has a 142Nd/144Nd ratio that is indistinguishable from that of chondritic meteorites but is 20 parts per million less than most samples from Earth. The Sm/Nd formation interval of the lunar mantle from these data is 215+23-21 million years after the onset of solar system condensation. Because both Earth and the Moon likely formed in the same region of the solar nebula, Earth should also have a chondritic bulk composition. In order to mass balance the Nd budget, these constraints require that a complementary reservoir with a lower 142Nd/144Nd value resides in Earth's mantle.

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