Lead isotope systematics of three Apollo 17 mare basaltsThe paper deals with new and more accurate determinations of uranium, thorium, and isotopic lead data for five bulk samples and separate pyroxene, ilmenite, and plagioclase from basalt 71055. In a concordia diagram, the samples suggest a postcrystallization disturbance of the U-Pb systems of the rock. There is no compelling reason, from U-Pb data, to believe that the moon is younger than 4.55 AE.
Document ID
19800039397
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Tilton, G. R. (California Univ. Santa Barbara, CA, United States)
Chen, J. H. (California, University Santa Barbara, Calif., United States)