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

Data Summary for gr13 K-feldspar

Click Here for a Complete Set of Measurements (in MS Excel 4.0 format)
E= 46.95 ± 1.38(kcal/mol) log(Do/ro^2)= 5.29 ± 0.37(1/sec) J= .006793

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 20 50.621 1.29 0.15 206.1 ± 1.10 -8.85 ± 4.21 -.02
450 20 13.887 0.48 0.20 23.8 ± 1.69 -8.90 ± 3.81 0.00
500 20 57.683 2.48 0.48 47.1 ± 0.30 -7.90 ± 3.83 -.04
500 20 46.736 1.03 0.60 14.2 ± 0.78 -8.08 ± 3.70 0.05
550 15 73.771 4.35 1.09 47.3 ± 0.21 -7.14 ± 4.72 -.02
550 27 63.141 4.35 1.59 11.2 ± 0.15 -7.19 ± 2.97 0.01
600 17 77.146 9.73 2.69 23.5 ± 0.10 -6.44 ± 4.22 -.01
600 20 79.543 6.37 3.41 9.6 ± 0.12 -6.54 ± 3.65 0.04
650 15 81.138 18.47 5.51 14.9 ± 0.04 -5.79 ± 4.67 -.02
650 20 87.820 11.49 6.81 9.6 ± 0.06 -5.98 ± 3.63 0.08
650 16 85.596 6.75 7.58 9.4 ± 0.10 -6.04 ± 4.35 0.11
700 17 86.882 19.61 9.81 10.8 ± 0.05 -5.53 ± 4.14 0.14
725 15 87.850 18.25 11.88 10.0 ± 0.04 -5.41 ± 4.60 0.21
750 15 89.393 18.44 13.97 9.9 ± 0.04 -5.33 ± 4.59 0.29
775 16 85.816 18.09 16.02 10.1 ± 0.05 -5.30 ± 4.33 0.40
800 15 89.558 13.43 17.55 10.2 ± 0.05 -5.35 ± 4.58 0.54
875 16 83.456 31.35 21.10 10.9 ± 0.02 -4.95 ± 4.32 0.65
850 15 85.063 7.83 21.99 10.5 ± 0.08 -5.48 ± 4.57 0.82
875 15 81.443 10.63 23.20 10.6 ± 0.07 -5.32 ± 4.57 0.84
900 15 81.030 12.37 24.60 10.9 ± 0.06 -5.23 ± 4.57 0.89
925 16 82.186 13.64 26.15 11.2 ± 0.05 -5.19 ± 4.31 0.96
950 17 79.210 16.07 27.97 12.0 ± 0.04 -5.12 ± 4.08 1.01
975 15 76.372 17.26 29.93 12.8 ± 0.06 -5.00 ± 4.57 1.04
1000 21 77.801 24.16 32.67 14.0 ± 0.03 -4.97 ± 3.40 1.10
1025 20 74.548 27.20 35.76 15.2 ± 0.05 -4.86 ± 3.54 1.12
1050 34 74.064 51.86 41.65 16.6 ± 0.07 -4.76 ± 2.34 1.15
1075 15 79.584 27.11 44.72 17.9 ± 0.05 -4.63 ± 4.55 1.16
1100 19 83.305 39.24 49.18 18.5 ± 0.04 -4.54 ± 3.68 1.18
1100 30 83.938 38.98 53.60 18.2 ± 0.04 -4.70 ± 2.55 1.26
1100 60 81.904 44.00 58.59 18.6 ± 0.06 -4.89 ± 1.72 1.36
1100 120 78.894 49.45 64.21 19.2 ± 0.07 -5.09 ± 1.43 1.45
1100 238 74.685 57.82 70.77 20.0 ± 0.08 -5.24 ± 1.34 1.53
1100 760 66.391 81.24 79.99 20.9 ± 0.12 -5.47 ± 1.24 1.65
1200 15 80.778 21.99 82.48 23.6 ± 0.07 -4.22 ± 4.57 1.27
1225 15 83.884 37.69 86.76 21.8 ± 0.06 -3.90 ± 4.56 1.17
1250 15 83.849 52.72 92.75 21.1 ± 0.05 -3.57 ± 4.56 1.06
1350 15 64.207 63.93 ***** 20.8 ± 0.12 Inf ± 1.50 -Inf