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

Data Summary for gr15 K-feldspar

Click Here for a Complete Set of Measurements (in MS Excel 4.0 format)
E= 50.02 ± 2.06(kcal/mol) log(Do/ro^2)= 6.33 ± 0.57(1/sec) J= .006789

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 19 78.335 1.18 0.15 544.5 ± 1.61 -8.79 ± 4.34 0.00
450 25 25.272 0.61 0.23 40.1 ± 1.20 -8.80 ± 3.28 0.00
500 17 78.525 2.10 0.50 58.0 ± 0.27 -7.81 ± 4.31 0.00
500 20 67.828 1.39 0.68 21.6 ± 0.47 -7.86 ± 3.70 0.02
550 16 89.832 6.08 1.47 104.2 ± 0.15 -6.86 ± 4.50 -.05
550 20 74.618 3.71 1.95 12.8 ± 0.15 -6.97 ± 3.68 0.01
600 15 87.750 9.80 3.22 36.7 ± 0.07 -6.24 ± 4.69 0.02
600 22 82.754 7.52 4.19 10.3 ± 0.09 -6.37 ± 3.39 0.09
650 15 88.958 16.05 6.27 17.9 ± 0.05 -5.72 ± 4.65 0.10
650 20 88.731 11.74 7.78 9.9 ± 0.06 -5.86 ± 3.62 0.17
700 15 89.020 21.23 10.53 12.5 ± 0.03 -5.36 ± 4.62 0.22
700 20 91.066 14.02 12.34 10.0 ± 0.05 -5.57 ± 3.59 0.33
725 15 87.791 12.78 14.00 10.3 ± 0.06 -5.42 ± 4.59 0.40
750 15 87.799 13.57 15.75 10.4 ± 0.05 -5.34 ± 4.59 0.49
775 15 88.268 14.41 17.62 10.5 ± 0.04 -5.27 ± 4.58 0.58
800 15 90.195 14.09 19.44 10.7 ± 0.05 -5.23 ± 4.58 0.68
825 15 90.221 14.47 21.31 10.9 ± 0.04 -5.18 ± 4.58 0.77
850 15 89.014 13.26 23.03 11.1 ± 0.04 -5.18 ± 4.57 0.88
875 15 88.194 14.01 24.84 11.9 ± 0.04 -5.12 ± 4.57 0.96
900 15 87.277 14.01 26.65 12.7 ± 0.05 -5.09 ± 4.57 1.05
925 19 87.557 16.81 28.82 14.0 ± 0.04 -5.08 ± 3.71 1.14
950 16 86.157 13.88 30.62 15.8 ± 0.04 -5.06 ± 4.31 1.22
975 15 86.517 15.44 32.62 18.6 ± 0.04 -4.96 ± 4.56 1.26
1000 15 87.165 17.59 34.89 22.0 ± 0.06 -4.87 ± 4.56 1.31
1025 22 88.427 29.35 38.69 26.0 ± 0.05 -4.78 ± 3.27 1.34
1050 17 90.187 29.55 42.51 29.7 ± 0.04 -4.62 ± 4.07 1.34
1075 15 89.686 32.55 46.72 31.2 ± 0.04 -4.48 ± 4.55 1.35
1100 28 90.924 56.19 53.99 31.9 ± 0.08 -4.46 ± 2.66 1.41
1100 75 88.995 69.12 62.93 34.3 ± 0.04 -4.71 ± 1.53 1.54
1100 110 85.179 46.71 68.97 38.4 ± 0.07 -4.96 ± 1.43 1.66
1100 158 82.727 39.21 74.04 41.3 ± 0.09 -5.12 ± 1.39 1.74
1100 215 76.797 35.77 78.67 43.2 ± 0.08 -5.21 ± 1.38 1.79
1100 1123 69.043 76.86 88.61 45.2 ± 0.10 -5.42 ± 1.09 1.89
1200 15 88.834 15.97 90.68 51.6 ± 0.06 -4.05 ± 4.56 1.47
1225 16 89.432 24.44 93.84 45.0 ± 0.06 -3.76 ± 4.28 1.39
1250 19 88.738 28.83 97.57 42.9 ± 0.06 -3.48 ± 3.64 1.31
1350 15 71.661 18.80 ***** 40.4 ± 0.09 Inf ± 4.27 -Inf