U-Th-Pb and Rb-Sr measurements on some Apollo 14 lunar samples.The concentrations of selected elements and elemental ratios in some Apollo 14 samples are presented in a table. Another table shows the isotopic composition of lead and strontium in some Apollo 14 samples. Graphs are provided with lead isotope ratio plots and a strontium evolution diagram. Rb-Sr ages are discussed together with isochron age methods of U-Th-Pb, a primary Pb-Pb isochron, a secondary Pb-Pb isochron, U-Pb concordia age relations, and U-Th-Pb concordia relations. Breccias and some soil samples as well as a basalt sample give evidence of significant enrichment of lead relative to uranium and thorium billions of years ago at the Fra Mauro site.
Document ID
19730034977
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Tatsumoto, M.
Hedge, C. E.
Doe, B. R.
Unruh, D. M. (U.S. Geological Survey Denver, Colo., United States)