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

Data Summary for gr19 K-feldspar

Click Here for a Complete Set of Measurements (in MS Excel 4.0 format)
E= 43.67 ± 1.28(kcal/mol) log(Do/ro^2)= 4.26 ± 0.34(1/sec) J= .006738

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 16 60.759 1.09 0.12 328.5 ± 2.34 -8.95 ± 4.87 0.00
450 23 11.852 0.54 0.18 19.5 ± 1.50 -9.02 ± 3.47 0.04
500 15 55.804 1.71 0.36 27.0 ± 0.35 -8.07 ± 4.76 -.01
500 19 51.888 1.42 0.51 12.2 ± 0.38 -8.04 ± 3.86 -.02
550 12 65.390 3.28 0.86 26.1 ± 0.18 -7.28 ± 5.72 -.03
550 26 62.651 3.89 1.28 9.9 ± 0.15 -7.35 ± 3.05 0.00
600 19 73.647 8.89 2.24 13.8 ± 0.07 -6.64 ± 3.87 -.02
600 20 79.669 5.77 2.86 10.4 ± 0.09 -6.68 ± 3.65 0.01
650 19 81.140 14.03 4.36 11.9 ± 0.04 -6.13 ± 3.83 0.02
650 31 84.605 12.84 5.74 10.7 ± 0.06 -6.23 ± 2.66 0.08
700 22 87.458 23.61 8.28 11.7 ± 0.03 -5.67 ± 3.38 0.06
700 24 90.884 15.11 9.90 11.4 ± 0.04 -5.79 ± 3.12 0.12
725 15 91.028 13.33 11.33 11.8 ± 0.05 -5.58 ± 4.60 0.14
750 15 88.288 17.58 13.22 12.2 ± 0.03 -5.39 ± 4.60 0.16
775 16 89.506 19.06 15.27 12.7 ± 0.03 -5.32 ± 4.33 0.24
800 15 88.882 19.49 17.36 13.0 ± 0.03 -5.22 ± 4.58 0.30
825 8 90.154 10.72 18.51 13.8 ± 0.06 -5.17 ± 8.27 0.37
850 17 88.726 20.22 20.69 14.2 ± 0.03 -5.18 ± 4.10 0.47
875 19 87.632 24.64 23.33 15.1 ± 0.04 -5.10 ± 3.72 0.52
900 16 87.349 21.48 25.64 16.2 ± 0.03 -5.03 ± 4.31 0.58
925 19 88.132 27.99 28.64 17.4 ± 0.04 -4.95 ± 3.71 0.62
950 16 88.282 29.97 31.86 18.4 ± 0.03 -4.80 ± 4.31 0.63
975 16 88.134 33.82 35.50 19.5 ± 0.04 -4.70 ± 4.30 0.66
1000 18 88.107 40.28 39.82 20.8 ± 0.04 -4.63 ± 3.87 0.69
1025 38 88.661 84.22 48.87 23.1 ± 0.04 -4.56 ± 2.14 0.73
1050 28 89.002 56.30 54.91 24.9 ± 0.04 -4.52 ± 2.67 0.79
1075 21 90.724 48.17 60.09 26.5 ± 0.04 -4.41 ± 3.37 0.79
1100 20 91.809 44.25 64.84 27.6 ± 0.04 -4.37 ± 3.52 0.84
1100 66 91.660 67.92 72.14 28.4 ± 0.03 -4.62 ± 1.61 0.97
1100 126 88.869 53.87 77.92 29.9 ± 0.05 -4.90 ± 1.39 1.11
1100 271 84.217 54.06 83.73 31.5 ± 0.06 -5.12 ± 1.31 1.21
1100 769 75.497 55.75 89.72 33.0 ± 0.09 -5.39 ± 1.25 1.35
1200 67 87.452 49.85 95.07 35.4 ± 0.06 -4.13 ± 1.52 0.96
1225 61 82.217 33.59 98.68 33.7 ± 0.09 -3.84 ± 1.40 0.86
1250 26 63.009 7.66 99.50 33.9 ± 0.31 -3.60 ± 2.78 0.80
1350 10 40.331 4.66 ***** 35.9 ± 0.95 Inf ± 1.45 -Inf