Lead isotope systematics of some Apollo 17 soils and some separated components from 76501Isotopic lead data from bulk samples of Apollo 17 soils were analyzed, and they define a chord in a concordia diagram, showing the presence of a component or components containing excess radiogenic lead with Pb-207/Pb-206 equal to about 1.32. The chord is distinctly different from the cataclysm chord, for which Pb-207/Pb-206 is approximately 1.45. Nitric acid analysis of plagioclase indicates lead ages of around 4.35 AE, in agreement with previous findings. Agglutinates from soil 76501,34 show loss of approximately 15% of lead.
Document ID
19750055558
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Church, S. E.
Tilton, G. R. (California, University Santa Barbara, Calif., United States)