Data Summary for 93-NG-17 K-feldspar
Click Here for a Complete Set of Measurements (in MS Excel 4.0 format)
| E= 41.60 ± 1.10(kcal/mol) | | log(Do/ro^2)= 3.70 ± 0.29(1/sec) | | J= .004300 |
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| Temp. | time | % 40Ar* | 39Ar | % 39Ar* | age ± 1sd | log(D/r^2) ± 1sd | log(r/ro) |
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| (C) | (min) | -- | (E-14 mol) | released | (Ma) | (1/sec) | -- |
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| 450 | 20 | 8.255 | 0.40 | 0.14 | 94.2 ± 15.24 | -8.89 ± 4.21 | 0.01 |
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| 450 | 21 | 17.563 | 0.15 | 0.19 | 31.2 ± 3.64 | -8.95 ± 3.70 | 0.04 |
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| 500 | 28 | 79.576 | 0.89 | 0.51 | 38.9 ± 1.12 | -7.99 ± 3.10 | -.03 |
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| 500 | 24 | 92.100 | 0.41 | 0.65 | 35.3 ± 1.18 | -8.04 ± 3.24 | -.01 |
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| 550 | 19 | 91.524 | 1.15 | 1.05 | 38.5 ± 0.45 | -7.33 ± 3.87 | -.01 |
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| 550 | 20 | 95.576 | 0.89 | 1.36 | 37.9 ± 0.55 | -7.31 ± 3.67 | -.02 |
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| 600 | 19 | 94.815 | 2.37 | 2.19 | 41.2 ± 0.31 | -6.69 ± 3.85 | -.01 |
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| 600 | 23 | 97.332 | 1.73 | 2.79 | 42.3 ± 0.42 | -6.77 ± 3.27 | 0.03 |
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| 650 | 15 | 95.838 | 3.83 | 4.13 | 45.2 ± 0.26 | -6.09 ± 4.66 | -.03 |
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| 650 | 20 | 98.262 | 2.90 | 5.14 | 45.5 ± 0.37 | -6.21 ± 3.63 | 0.03 |
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| 700 | 15 | 98.059 | 4.57 | 6.74 | 47.3 ± 0.28 | -5.78 ± 4.63 | 0.07 |
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| 725 | 15 | 98.094 | 5.40 | 8.62 | 47.8 ± 0.25 | -5.60 ± 4.62 | 0.09 |
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| 750 | 15 | 98.428 | 7.29 | 11.17 | 48.6 ± 0.26 | -5.36 ± 4.61 | 0.09 |
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| 775 | 15 | 98.788 | 6.14 | 13.31 | 49.1 ± 0.25 | -5.34 ± 4.60 | 0.18 |
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| 800 | 15 | 98.952 | 6.63 | 15.63 | 49.5 ± 0.26 | -5.23 ± 4.59 | 0.23 |
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| 825 | 15 | 98.321 | 6.86 | 18.02 | 49.9 ± 0.26 | -5.15 ± 4.58 | 0.29 |
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| 850 | 18 | 99.010 | 7.73 | 20.72 | 50.2 ± 0.27 | -5.12 ± 3.90 | 0.36 |
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| 875 | 15 | 99.046 | 5.84 | 22.76 | 50.8 ± 0.27 | -5.11 ± 4.57 | 0.45 |
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| 900 | 15 | 99.120 | 7.05 | 25.22 | 51.5 ± 0.27 | -4.99 ± 4.57 | 0.47 |
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| 925 | 15 | 98.989 | 3.83 | 26.55 | 52.0 ± 0.29 | -5.22 ± 4.57 | 0.67 |
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| 950 | 15 | 98.880 | 7.53 | 29.18 | 52.8 ± 0.28 | -4.89 ± 4.57 | 0.58 |
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| 975 | 13 | 99.114 | 6.36 | 31.40 | 53.6 ± 0.28 | -4.87 ± 5.20 | 0.64 |
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| 1000 | 22 | 99.157 | 9.03 | 34.55 | 54.0 ± 0.29 | -4.91 ± 3.27 | 0.73 |
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| 1025 | 27 | 99.158 | 10.00 | 38.06 | 54.5 ± 0.30 | -4.91 ± 2.78 | 0.80 |
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| 1050 | 23 | 98.954 | 7.94 | 40.83 | 54.7 ± 0.29 | -4.90 ± 3.15 | 0.87 |
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| 1075 | 15 | 98.337 | 5.75 | 42.84 | 54.7 ± 0.30 | -4.83 ± 4.56 | 0.90 |
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| 1075 | 15 | 98.487 | 4.21 | 44.30 | 54.9 ± 0.31 | -4.95 ± 4.56 | 0.95 |
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| 1075 | 32 | 98.407 | 6.61 | 46.61 | 55.1 ± 0.32 | -5.07 ± 2.45 | 1.01 |
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| 1075 | 76 | 98.153 | 10.80 | 50.38 | 55.4 ± 0.36 | -5.21 ± 1.59 | 1.08 |
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| 1075 | 122 | 98.279 | 10.60 | 54.07 | 55.6 ± 0.47 | -5.37 ± 1.45 | 1.16 |
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| 1075 | 224 | 98.051 | 12.00 | 58.25 | 56.0 ± 0.58 | -5.54 ± 1.38 | 1.25 |
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| 1075 | 840 | 99.133 | 22.40 | 66.06 | 56.6 ± 1.05 | -5.78 ± 1.30 | 1.37 |
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| 1150 | 22 | 94.124 | 2.32 | 66.87 | 58.1 ± 0.47 | -5.13 ± 3.28 | 1.22 |
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| 1175 | 30 | 93.350 | 4.53 | 68.46 | 57.4 ± 0.41 | -4.96 ± 2.59 | 1.19 |
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| 1200 | 16 | 95.359 | 7.08 | 70.93 | 57.2 ± 0.34 | -4.46 ± 4.31 | 1.00 |
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| 1225 | 16 | 96.606 | 11.00 | 74.77 | 56.7 ± 0.43 | -4.22 ± 4.31 | 0.93 |
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| 1250 | 21 | 97.780 | 29.30 | 84.99 | 56.7 ± 0.41 | -3.78 ± 3.34 | 0.75 |
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| 1275 | 23 | 97.505 | 25.90 | 94.04 | 56.3 ± 0.31 | -3.57 ± 3.03 | 0.70 |
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| 1300 | 15 | 96.822 | 12.80 | 98.50 | 56.5 ± 0.45 | -3.21 ± 4.44 | 0.56 |
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| 1400 | 12 | 80.296 | 3.44 | 99.70 | 58.9 ± 0.56 | -3.04 ± 5.51 | 0.65 |
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| 1550 | 15 | 23.421 | 0.86 | 99.99 | 103.0 ± 7.19 | -2.82 ± 5.53 | 0.76 |
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