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

Data Summary for gr18 K-feldspar

Click Here for a Complete Set of Measurements (in MS Excel 4.0 format)
E= 46.04 ± 1.04(kcal/mol) log(Do/ro^2)= 4.69 ± 0.27(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 74.461 0.76 0.08 0.0 ± 5.00 -9.22 ± 5.09 0.00
450 24 7.966 0.41 0.13 0.0 ± 5.00 -9.29 ± 3.37 0.03
500 17 62.990 1.47 0.29 0.0 ± 5.00 -8.29 ± 4.32 -.02
500 20 48.354 0.96 0.39 0.0 ± 5.00 -8.33 ± 3.70 0.00
550 15 84.363 3.08 0.73 0.0 ± 5.00 -7.48 ± 4.72 -.02
550 22 68.652 2.58 1.01 0.0 ± 5.00 -7.54 ± 3.42 0.00
600 15 84.946 6.26 1.69 0.0 ± 5.00 -6.80 ± 4.69 -.02
600 21 79.846 5.09 2.24 11.2 ± 2.00 -6.87 ± 3.52 0.02
650 15 85.190 12.70 3.63 16.3 ± 2.00 -6.15 ± 4.67 -.03
650 20 85.950 9.64 4.68 11.5 ± 1.00 -6.25 ± 3.64 0.02
700 15 89.600 19.20 6.76 13.2 ± 1.00 -5.68 ± 4.64 0.02
700 25 89.912 16.60 8.57 11.7 ± 1.00 -5.84 ± 3.04 0.09
750 16 90.549 23.40 11.11 13.0 ± 1.00 -5.39 ± 4.36 0.12
750 21 90.171 15.80 12.84 12.1 ± 0.07 -5.59 ± 3.44 0.22
800 15 90.820 23.30 15.37 13.6 ± 0.05 -5.21 ± 4.59 0.26
800 20 90.324 17.00 17.22 12.6 ± 0.06 -5.40 ± 3.57 0.36
850 16 89.900 25.40 19.98 13.5 ± 0.04 -5.08 ± 4.32 0.40
850 22 89.369 17.70 21.91 13.5 ± 0.06 -5.32 ± 3.29 0.53
900 16 86.936 23.00 24.41 15.2 ± 0.05 -5.02 ± 4.31 0.57
925 15 88.957 21.10 26.70 16.3 ± 0.06 -4.99 ± 4.57 0.64
950 15 90.189 25.60 29.48 17.8 ± 0.04 -4.86 ± 4.56 0.66
975 15 89.591 26.70 32.39 20.0 ± 0.04 -4.80 ± 4.56 0.72
1000 10 88.593 23.20 34.92 22.8 ± 0.05 -4.65 ± 6.66 0.72
1025 15 89.040 35.90 38.82 25.7 ± 0.05 -4.60 ± 4.55 0.77
1050 27 89.921 68.70 46.30 29.5 ± 0.05 -4.51 ± 2.74 0.80
1075 15 90.473 45.80 51.28 31.9 ± 0.06 -4.37 ± 4.54 0.80
1100 15 91.749 45.70 56.26 33.5 ± 0.04 -4.31 ± 4.54 0.84
1100 32 91.122 56.00 62.35 35.0 ± 0.04 -4.50 ± 2.41 0.93
1100 57 88.560 50.00 67.79 37.5 ± 0.06 -4.73 ± 1.73 1.05
1100 98 85.308 43.70 72.54 41.0 ± 0.07 -4.96 ± 1.47 1.16
1100 158 82.096 39.70 76.85 44.5 ± 0.07 -5.14 ± 1.39 1.25
1100 757 77.947 78.80 85.43 48.7 ± 0.13 -5.38 ± 1.16 1.37
1200 21 92.959 27.50 88.42 52.5 ± 0.19 -4.13 ± 3.37 1.00
1220 15 92.557 35.10 92.25 52.5 ± 0.19 -3.74 ± 4.52 0.85
1240 20 90.900 38.10 96.40 52.5 ± 0.19 -3.59 ± 3.44 0.81
1260 18 85.179 18.80 98.44 52.5 ± 0.19 -3.50 ± 3.79 0.82
1300 15 71.535 9.66 99.49 52.5 ± 0.19 -3.30 ± 4.49 0.80
1550 16 ****** 4.68 99.99 52.5 ± 0.19 -2.78 ± 1.42 0.98