Pb isotopes in anorthositic breccias 67075 and 62237 - A search for primitive lunar leadThe lunar Pb isotopic evolution is explored based on an investigation of the U-Th-Pb systematics of the primitive Apollo 16 anorthositic breccias 76075 and 62237. The isotope data for acid-leached residues from 67075 lie within or on a triangle formed by plagioclase, opaques, and a pyroxen-olivine mixture, and the isotope data for 62237 lie within or on a triangle formed by plagioclase, olivine, and pyroxene. The results suggest that the moon had high first-stage values for the Pb evolution equations from the onset.
Document ID
19890049120
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Premo, W. R. (Geological Survey Denver, CO, United States)
Tatsumoto, M. (Geological Survey Denver, CO, United States)