1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 20 40 60 80 100 120 140 Age (Ma) 235U-207Pb K-Ar K-Ar 238U-206Pb 232Th-208Pb FT Record Number #9178, Age vs Half-Life Monzonite from Fergus Co., MT Concordance Score = 0.18 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 Age (Ma) 235U-207Pb KAr 238U-206Pb 232Th-208Pb FT Record Number #9180, Age vs Half-Life Syenite from Fergus Co., MT Concordance Score = 0.33 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 20 40 60 80 100 120 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Record Number #14949, Age vs Half-Life Granite from San Bernardino Co., CA 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 20 40 60 80 100 120 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Record Number #14969, Age vs Half-Life Quartz Monzonite from San Bernardino Co., CA Concordance Score = 1.00 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) BEACHY, KINARD AND GARNER How often do radioisotope ages agree? 2023 ICC 410
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