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The Sm-Nd history of KREEP
- Publication Year :
- 1978
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1978.
-
Abstract
- Sm-Nd whole rock measurements on a variety of KREEP-rich samples from different landing sites are reported. Despite a variation of Nd and Sm concentrations of almost a factor of 3, the Sm-Nd ratios, as well as the Nd-143/Nd-144 values, show an extremely close grouping. No systematic differences between samples from different landing sites are resolved. These results are taken to be indicative of a moon-wide process having been responsible for the generation of the KREEP source reservoir, 4.36 plus or minus 0.06 AE ago, as estimated from model age calculation.
- Subjects :
- Lunar And Planetary Exploration
Subjects
Details
- Language :
- English
- Database :
- NASA Technical Reports
- Notes :
- NGL-05-009-150
- Publication Type :
- Report
- Accession number :
- edsnas.19790055126
- Document Type :
- Report