Sample ID | Previous protocol | Â | Modified protocol | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ca/K | Cl/K | Mol 39Ar (× 10−15) | %40Ar* | Age (Ma) | ± 1SD | Sample ID | Ca/K | Cl/K | Mol 39Ar (× 10−15) | %40Ar* | Age (Ma) | ± 1SD | |
427-01 | 3.968 | − 0.447 | 0.001 | 7.8 | 7.20 | 3.10 | 619-01 | − 0.126 | − 0.051 | 0.024 | 63.5 | 14.83 | 0.25 |
427-02 | − 1.340 | − 1.645 | 0.001 | 18.6 | 11.56 | 5.10 | 619-02 | 0.022 | − 0.057 | 0.013 | 78.5 | 14.80 | 0.29 |
427-03 | 1.742 | − 0.366 | 0.001 | 29.3 | 6.03 | 1.90 | 619-03 | 0.101 | 0.199 | 0.018 | 83 | 14.07 | 0.20 |
427-04 | 0.827 | 0.331 | 0.004 | 27.9 | 10.41 | 0.69 | 619-04 | − 0.003 | − 0.022 | 0.042 | 77.4 | 15.10 | 0.13 |
427-05 | − 0.062 | 0.527 | 0.002 | 27.1 | 15.63 | 3.54 | 619-05 | 0.020 | − 0.043 | 0.022 | 81.8 | 14.66 | 0.25 |
427-06 | − 0.126 | 0.283 | 0.002 | 33.4 | 12.63 | 1.63 | 619-06 | − 0.067 | − 0.017 | 0.012 | 85.9 | 14.64 | 0.35 |
427-07 | − 0.577 | − 0.104 | 0.002 | 29.6 | 11.70 | 1.34 | 619-07 | − 0.104 | − 0.102 | 0.017 | 79.9 | 15.94 | 0.23 |
427-08 | 0.321 | 0.114 | 0.016 | 22.7 | 3.21 | 0.33 | 619-08 | 0.063 | − 0.262 | 0.005 | 88 | 16.51 | 0.97 |
427-09 | 0.701 | 0.093 | 0.007 | 7.9 | 1.46 | 0.61 | 619-09 | 0.067 | 0.012 | 0.010 | 94.8 | 15.47 | 0.34 |
427-10 | 0.209 | 0.041 | 0.006 | 28.3 | 8.60 | 1.30 | 619-10 | − 0.104 | − 0.047 | 0.021 | 73.7 | 14.94 | 0.21 |
427-11 | 0.081 | 0.097 | 0.010 | 35.6 | 7.07 | 0.73 | 619-11 | 0.069 | 0.063 | 0.018 | 75.1 | 14.82 | 0.26 |
427-12 | 0.591 | 0.270 | 0.006 | 20.6 | 5.97 | 1.08 | 619-12 | − 0.083 | − 0.009 | 0.016 | 68.5 | 15.21 | 0.22 |
 |  |  |  |  |  |  | 619-13 | 0.011 | − 0.004 | 0.019 | 65.6 | 15.32 | 0.19 |
 |  |  |  |  |  |  | 619-14 | − 0.008 | − 0.016 | 0.054 | 65.2 | 14.96 | 0.10 |
 |  |  |  |  |  |  | 619-15 | − 0.059 | − 0.017 | 0.016 | 75.3 | 14.58 | 0.28 |
 |  |  |  |  |  |  | 619-16 | − 0.117 | − 0.004 | 0.018 | 80.9 | 14.80 | 0.24 |
 |  |  | Weighted mean (Ma) | 5.02 |  |  | Weighted mean (Ma) | 14.97 | |||||
 |  |  | ± 1sd | 2.0 (43.1%) |  |  | ± 1sd | 0.2 (1.39%) | |||||
 |  |  | MSWD | 18.00 |  |  | MSWD | 3.60 |