Physics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1283g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Sept. 1977, p. 1283-1301.
Physics
12
Abundance, Feldspars, Geochronology, Gneiss, Lead Isotopes, Thorium, Uranium, Chemical Analysis, Leaching, Lead (Metal), Metamorphism (Geology), Radiogenic Materials
Scientific paper
Pb isotopic abundances and U-Th-Pb concentrations are reported for feldspar megacrysts from the 3.59 AE old Amitsoq gneisses, Godthaab District, west Greenland. The distinctive Pb is the most primitive terrestrial Pb so far observed. Besides the Pb which appears to be either the initial Pb in the Amitsoq gneiss or the initial Pb only slightly modified by subsequent metamorphism in a low U-238/Pb-204 environment, the feldspars contain a very small amount of easily leachable radiogenic Pb which is correlated with U and which indicates the formation of U-rich phases at about 2.7 AE. If the Amitsoq gneiss feldspar Pb was the initial Pb in the gneiss at 3.59 AE, then the single-stage 'age of the earth' is determined to be 4.47 plus or minus 0.05 AE and mu is 8.5. If the feldspar Pb was modified by metamorphism at 2.7 AE, the model age of the earth is calculated as 4.53 AE.
Gancarz A. J.
Wasserburg Gerald J.
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