1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 200 400 600 800 1000 1200 1400 1600 Age (Ma) K-Ar Rb-Sr FT Record Number #4469, Age vs Half-Life Granodiorite from Pima Co., AZ Concordance Score = 0.50 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 10 20 30 40 50 60 70 80 Age (Ma) K-Ar Rb-Sr FT Record Number #5051, Age vs Half-Life Quartz monzonite from Custer Co., ID Concordance Score = 0.20 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 Age (Ma) 235U-207Pb K-Ar 238U-206Pb Rb-Sr Record Number #5489, Age vs Half-Life Schist from Westchester Co., NY Concordance Score = 0.00 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) Age (Ma) Record Number #5683, Age vs Half-Life Gneiss from Yancey Co., NC Concordance Score = 0.47 1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 200 400 600 800 1000 1200 1400 K-Ar Rb-Sr 235U-207Pb Pb-Pb 238U-206Pb 232Th-208Pb 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 408
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