1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 200 400 600 800 1000 1200 1400 Age (Ma) 235U-207Pb K-Ar 207Pb-206Pb 238U-206Pb Rb-Sr Record Number #561, Age vs Half-Life Pegmatite from Taos Co., NM Concordance Score = 0.44 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 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Record Number #562, Age vs Half-Life Granite from Yavapai Co., AZ Concordance Score = 0.07 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 Pb-Pb 238U-206Pb 232Th-208Pb Rb-Sr Record Number #563, Age vs Half-Life Granite from Gunnison Co., CO Concordance Score = 0.07 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 232Th-208Pb Rb-Sr Record Number #564, Age vs Half-Life Granite from Llano Co., TX Concordance Score = 0.80 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 404
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