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- W2051244825 abstract "Rubidium–strontium and samarium–neodymium isotopes of lunar meteorite LaPaz Icefield (LAP) 02205 are consistent with derivation of the parent magma from a source region similar to that which produced the Apollo 12 low-Ti olivine basalts followed by mixing of the magma with small amounts (1–2 wt%) of trace element-enriched material similar to lunar KREEP-rich sample SaU 169. The crystallization age of LAP 02205 is most precisely dated by an internal Rb–Sr isochron of 2991 ± 14 Ma, with an initial 87Sr/88Sr at the time of crystallization of 0.699836 ± 0.000010. Leachable REE-rich phosphate phases of LAP 02205 do not plot on a Sm–Nd mineral isochron, indicating contamination or open system behavior of the phosphates. Excluding anomalous phases from the calculation of a Sm–Nd isochron yields a crystallization age of 2992 ± 85 (initial ε143Nd = +2.9 ± 0.8) that is within error of the Rb–Sr age, and in agreement with other independent age determinations for LAP 02205 from Ar–Ar and U–Pb methods. The calculated 147Sm/144Nd source ratios for LAP 02205, various Apollo 12 and 15 basalts, and samples with strong affinities to KREEP (SaU 169, NWA 773, 15386) are uncorrelated with their crystallization ages. This finding does not support the involvement of a common KREEP component as a heat source for lunar melting events that occurred after crystallization of the lunar magma ocean." @default.
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- W2051244825 date "2007-04-01" @default.
- W2051244825 modified "2023-10-03" @default.
- W2051244825 title "A Rb–Sr and Sm–Nd isotope geochronology and trace element study of lunar meteorite LaPaz Icefield 02205" @default.
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- W2051244825 doi "https://doi.org/10.1016/j.gca.2007.01.014" @default.
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