1E+02 1E+03 1E+04 1E+09 1E+10 Half-Life (Ga) 0 50 100 150 200 250 300 350 400 450 500 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Record Number #1708, Age vs Half-Life Granite from Essex Co., MA Concordance Score = 0.60 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 50 100 150 200 250 300 350 400 450 Age (Ma) 235U-207Pb KAr 238U-206Pb 232Th-208Pb RbSr Record Number #1714, Age vs Half-Life Granite from Essex Co., MA Concordance Score = 0.45 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 #1724, Age vs Half-Life Granite from Marinnete Co., WI Concordance Score = 0.49 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 2000 Age (Ma) 235U-207Pb K-Ar 238U-206Pb 232Th-208Pb Rb-Sr Record Number #1725, Age vs Half-Life Quartz diorite from Marinnete Co., WI Concordance Score = 0.71 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 407
RkJQdWJsaXNoZXIy MTM4ODY=