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 Rb-Sr Record Number #6555, Age vs Half-Life Schist from Park Co., MT Concordance Score = 0.10 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 Rb-Sr Record Number #6557, Age vs Half-Life Gneiss from Park Co., MT Concordance Score = 0.10 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 Age (Ma) K-Ar 238U-206Pb Rb-Sr Record Number #6559, Age vs Half-Life Gneiss from Park Co., MT Concordance Score = 0.17 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 10 20 30 40 50 60 70 80 90 100 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb FT Record Number #9177, Age vs Half-Life Quartz Monzonite from Fergus Co., MT Concordance Score = 0.47 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 409
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