(Click here for a Complete Data Set in Excel 4.0 format)

Data Summary for gr12 K-feldspar

Click Here for a Complete Set of Measurements (in MS Excel 4.0 format)
E= 42.07 ± 1.28(kcal/mol) log(Do/ro^2)= 4.36 ± 0.34(1/sec) J= .000000

Temp. time % 40Ar* 39Ar % 39Ar* age ± 1sd log(D/r^2) ± 1sd log(r/ro)
(C) (min) -- (E-14 mol) released (Ma) (1/sec) --
450 15 26.164 1.21 0.21 0.0 ± 6.80 -8.41 ± 5.09 0.03
450 20 13.345 0.68 0.33 0.0 ± 2.54 -8.38 ± 3.82 0.01
500 17 41.881 2.33 0.74 0.0 ± 0.99 -7.48 ± 4.31 -.03
500 20 46.770 1.50 1.00 0.0 ± 0.70 -7.53 ± 3.70 0.00
550 15 54.656 4.22 1.73 9.6 ± 0.48 -6.76 ± 4.70 -.03
550 21 56.508 3.37 2.32 7.0 ± 0.37 -6.83 ± 3.53 0.01
600 16 53.133 8.54 3.81 10.7 ± 0.21 -6.13 ± 4.42 -.02
600 25 68.668 7.10 5.05 8.1 ± 0.20 -6.24 ± 3.07 0.03
650 15 52.364 13.00 7.32 10.4 ± 0.17 -5.61 ± 4.64 0.00
650 24 80.142 10.30 9.12 8.8 ± 0.15 -5.79 ± 3.13 0.09
700 16 54.692 16.70 12.04 10.1 ± 0.15 -5.30 ± 4.35 0.10
700 26 85.042 11.20 14.00 9.2 ± 0.05 -5.59 ± 2.91 0.25
750 24 63.318 17.60 17.06 11.4 ± 0.05 -5.28 ± 3.09 0.33
750 29 86.952 7.45 18.36 9.7 ± 0.09 -5.68 ± 2.67 0.53
800 17 56.770 11.70 20.40 12.7 ± 0.08 -5.22 ± 4.09 0.50
800 22 83.863 8.44 21.87 10.1 ± 0.09 -5.43 ± 3.29 0.61
850 21 55.496 14.90 24.46 12.7 ± 0.07 -5.13 ± 3.41 0.65
850 22 76.835 8.97 26.03 11.1 ± 0.08 -5.33 ± 3.28 0.75
900 15 53.303 12.20 28.15 14.6 ± 0.10 -5.00 ± 4.56 0.76
900 26 71.855 14.80 30.72 12.4 ± 0.06 -5.12 ± 2.86 0.82
950 16 56.563 17.30 33.74 16.6 ± 0.07 -4.80 ± 4.30 0.82
975 18 63.999 18.40 36.95 15.5 ± 0.06 -4.78 ± 3.87 0.89
1000 20 63.849 22.70 40.91 17.0 ± 0.07 -4.70 ± 3.53 0.92
1025 14 64.854 20.70 44.52 18.2 ± 0.08 -4.54 ± 4.84 0.91
1050 34 68.511 46.00 52.53 20.1 ± 0.07 -4.52 ± 2.30 0.97
1075 29 71.255 31.70 58.05 23.5 ± 0.06 -4.54 ± 2.59 1.04
1100 15 72.511 16.60 60.94 26.8 ± 0.09 -4.49 ± 4.54 1.08
1100 30 74.093 22.50 64.86 28.3 ± 0.06 -4.62 ± 2.54 1.14
1100 45 76.088 22.30 68.74 29.0 ± 0.07 -4.76 ± 1.96 1.21
1100 67 78.927 23.00 72.76 29.3 ± 0.06 -4.86 ± 1.64 1.26
1100 118 83.586 26.90 77.44 29.3 ± 0.05 -4.97 ± 1.43 1.31
1100 193 91.754 27.20 82.17 29.4 ± 0.05 -5.08 ± 1.37 1.37
1100 783 ****** 43.00 89.66 29.3 ± 0.07 -5.33 ± 1.18 1.50
1200 20 80.438 23.10 93.68 28.1 ± 0.18 -3.78 ± 3.50 0.95
1225 40 86.606 25.00 98.03 28.1 ± 0.18 -3.71 ± 1.87 0.96
1250 38 ****** 6.33 99.13 28.1 ± 0.18 -3.84 ± 2.04 1.08
1275 12 ****** 0.91 99.29 28.1 ± 0.18 -3.95 ± 5.65 1.18
1350 15 ****** 0.85 99.44 28.1 ± 0.18 -3.98 ± 4.66 1.34
1550 12 29.059 3.22 99.99 28.1 ± 0.18 -2.64 ± 4.44 0.98