APPENDIX C: FULL THREE METHODS COMPARISON 1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ma) 0 400 800 1200 1600 2000 2400 2800 Age (Ma) 235U-207Pb 238U-206Pb 232Th-208Pb RbSr FT Record Number #77, Age vs Half-Life Granodiorite from Fremont Co., WY Concordance Score = 0.23 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 (Ma) 0 50 100 150 200 250 300 350 400 450 Age (Ma) 235U-207Pb K-Ar 238U-206Pb Rb-Sr Record Number #558, Age vs Half-Life Pegmatite from Mitchell Co., NC Concordance Score = 0.92 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 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Record Number #559, Age vs Half-Life Pegmatite from Pennington Co., SD Concordance Score = 0.75 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 Age (Ma) 235U-207Pb 235U-207Pb K-Ar 238U-206Pb 238U-206Pb 232Th-208Pb Rb-Sr Record Number #560, Age vs Half-Life Pegmatite from Gunnison Co., CO Concordance Score = 0.35 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 403
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