1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 400 800 1200 1600 2000 2400 2800 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Rb-Sr Record Number #1681, Age vs Half-Life Granite from Dickinson Co., MI Concordance Score = 0.32 Pb-Pb 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 Atomic Weight of Parent Isotope (amu) 1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Rb-Sr Record Number #1682, Age vs Half-Life Granite from Dickinson Co., MI Concordance Score = 0.36 Pb-Pb 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 Atomic Weight of Parent Isotope (amu) 1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 400 800 1200 1600 2000 2400 2800 3200 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Rb-Sr Record Number #1684, Age vs Half-Life Granite from Iron Co., MI Concordance Score = 0.29 Pb-Pb 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 Atomic Weight of Parent Isotope (amu) 1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 100 200 300 400 500 600 700 800 900 1000 Age (Ma) 235U-207Pb K-Ar K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Record Number #1694, Age vs Half-Life Granite from Norfolk Co., MA Concordance Score = 0.24 Pb-Pb 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 Atomic Weight of Parent Isotope (amu) BEACHY, KINARD AND GARNER How often do radioisotope ages agree? 2023 ICC 406
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