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Accueil Tous les numéros Volume 192 (2021) BSGF - Earth Sci. Bull., 192 (2021) 33 Full HTML

Table 3

40Ar/39Ar isotopic data for micas and adularia from the Puy-les-Vignes deposit.

Relative isotopic abundances (fAmps)* Apparent age
Sample 40Ar ± 39Ar ± 38Ar ± 37Ar ± 36Ar ± Ca/K ± Cl/K ± 40Ar*/39Ar(K) ± 40Ar* (%) Age (Ma) ± 1s
PLV-02-01a: muscovite from greisenized gneiss clast
Spot 1 119.293 0.074 2.718 0.056 0.043 0.029 −0.014 0.026 0.001 0.001 2.718 0.124 0.010 0.032 43.710 0.922 99.65 318.5 6.2
Spot 2 130.569 0.075 2.924 0.062 0.048 0.032 0.068 0.027 0.000 0.001 2.924 0.119 0.013 0.033 44.627 0.974 100.01 324.6 6.5
Spot 3 139.169 0.079 3.117 0.063 0.071 0.030 −0.037 0.028 0.003 0.001 3.117 0.115 0.030 0.028 44.341 0.917 99.39 322.7 6.1
Spot 4 113.688 0.067 2.502 0.061 0.061 0.031 0.039 0.024 0.004 0.001 2.502 0.125 0.034 0.036 44.884 1.126 98.86 326.3 7.5
Spot 5 134.910 0.073 3.133 0.065 0.001 0.032 0.069 0.025 0.000 0.001 3.133 0.105 −0.034 0.030 43.055 0.910 100.05 314.1 6.1
Spot 6 128.858 0.072 3.044 0.063 0.050 0.033 0.023 0.029 0.001 0.001 0.097 0.124 0.012 0.031 42.166 0.901 99.69 308.2 6.1
Fluence J: 0.0044174 ± 2.45  ×  10−6 Weighted mean 40Ar/39Ar age: 318.5 2.6
PV1: muscovite from a quartz-wolframite vein
Spot 1 110.547 0.078 2.602 0.065 0.033 0.029 0.002 0.028 0.001 0.001 0.006 0.111 0.001 0.033 42.325 1.090 99.66 310.3 7.3
Spot 2 127.717 0.078 2.947 0.064 0.102 0.031 −0.014 0.026 0.003 0.001 −0.048 0.092 0.064 0.031 42.971 0.969 99.22 314.6 6.5
Spot 3 131.603 0.078 2.926 0.056 0.041 0.029 −0.042 0.028 0.001 0.001 −0.158 0.105 0.005 0.029 44.880 0.882 99.84 327.4 5.9
Spot 4 136.508 0.081 2.925 0.061 0.033 0.029 −0.058 0.026 0.001 0.001 −0.218 0.100 −0.003 0.029 46.535 0.995 99.80 338.4 6.6
Spot 5 138.278 0.072 3.127 0.065 0.067 0.032 −0.028 0.027 −0.001 0.001 −0.097 0.096 0.026 0.030 44.254 0.940 100.15 323.2 6.3
Spot 6 120.527 0.074 2.718 0.069 −0.008 0.031 −0.051 0.028 0.002 0.001 −0.207 0.114 −0.044 0.034 44.131 1.152 99.60 322.4 7.7
Spot 7 130.326 0.077 2.935 0.066 0.093 0.032 −0.015 0.030 0.005 0.001 −0.055 0.111 0.055 0.032 43.827 1.009 98.75 320.4 6.8
Spot 8 130.522 0.089 2.864 0.066 0.034 0.034 0.014 0.027 0.002 0.001 0.052 0.103 −0.001 0.035 45.374 1.070 99.62 330.7 7.1
Fluence J: 0.0044338 ± 1.54  ×  10−6 Weighted mean 40Ar/39Ar age: 324.1 2.4
PLV-02-02b: muscovite from rare-metal granite
Spot 1 122.597 0.074 2.891 0.067 0.046 0.030 0.040 0.026 0.001 0.001 0.184 0.123 0.011 0.031 42.284 1.010 99.77 309.7 6.8
Spot 2 124.771 0.083 2.821 0.065 0.047 0.032 −0.057 0.030 0.002 0.001 −0.272 0.142 0.012 0.034 43.950 1.046 99.45 320.8 7.0
Spot 3 127.648 0.072 2.870 0.059 0.049 0.029 −0.014 0.028 0.001 0.001 −0.064 0.129 0.013 0.030 44.331 0.934 99.74 323.4 6.2
Spot 4 121.773 0.077 2.890 0.067 −0.019 0.028 0.010 0.028 0.002 0.001 0.050 0.140 −0.054 0.028 41.931 1.005 99.60 307.3 6.8
Spot 5 120.231 0.070 2.811 0.058 0.005 0.029 0.030 0.028 0.009 0.001 0.152 0.144 −0.032 0.030 41.816 0.886 97.84 306.5 6.0
Spot 6 124.828 0.082 2.904 0.063 −0.003 0.028 0.052 0.027 −0.001 0.001 0.263 0.139 −0.038 0.029 43.057 0.957 100.24 314.9 6.4
Spot 7 122.917 0.072 3.067 0.069 0.029 0.032 −0.026 0.027 0.003 0.001 −0.124 0.130 −0.008 0.030 39.769 0.922 99.32 292.7 6.3
Fluence J: 0.0044286 ± 1.65  ×  10−6 Weighted mean 40Ar/39Ar age: 311.0 2.4
PV-92-7: muscovite from microgranite dyke
Spot 1 118.123 0.080 2.583 0.060 0.044 0.034 −0.065 0.027 0.005 0.001 −0.287 0.120 0.013 0.039 45.110 1.074 98.70 328.0 7.1
Spot 2 120.757 0.073 2.769 0.062 0.066 0.032 −0.013 0.027 0.005 0.001 −0.052 0.111 0.033 0.034 43.078 0.991 98.85 314.4 6.6
Spot 3 124.290 0.078 2.825 0.061 0.028 0.031 0.001 0.026 0.001 0.001 0.004 0.104 −0.007 0.032 43.861 0.969 99.75 319.7 6.5
Spot 4 125.860 0.075 2.779 0.061 0.085 0.030 0.034 0.027 0.007 0.001 0.140 0.114 0.052 0.032 44.559 1.005 98.46 324.3 6.7
Spot 5 124.579 0.079 2.680 0.060 0.037 0.029 0.038 0.027 0.002 0.001 0.164 0.117 0.004 0.032 46.283 1.070 99.63 335.8 7.1
Spot 6 114.466 0.072 2.462 0.064 0.165 0.031 −0.036 0.028 0.002 0.001 −0.167 0.133 0.158 0.037 46.228 1.229 99.50 335.4 8.1
Spot 7 140.712 0.077 2.822 0.062 0.029 0.030 −0.053 0.026 0.048 0.001 −0.219 0.109 −0.015 0.031 44.783 1.020 89.88 325.8 6.8
Spot 8 128.764 0.078 2.955 0.067 −0.025 0.029 0.027 0.023 0.003 0.001 0.108 0.092 −0.060 0.029 43.286 1.006 99.40 315.8 6.7
Spot 9 121.731 0.082 2.757 0.058 0.088 0.030 0.025 0.029 0.002 0.001 0.106 0.123 0.057 0.033 43.928 0.955 99.54 320.1 6.4
Spot 10 90.648 0.078 1.943 0.065 0.121 0.028 −0.012 0.027 0.003 0.001 −0.091 0.206 0.144 0.043 46.182 1.582 99.08 335.1 10.5
Spot 11 141.845 0.074 3.131 0.065 0.087 0.030 0.024 0.028 0.002 0.001 0.110 0.131 0.045 0.028 45.134 0.963 99.68 328.1 6.4
Spot 12 117.096 0.081 2.783 0.062 −0.004 0.030 −0.069 0.028 0.001 0.001 −0.364 0.147 −0.039 0.032 41.871 0.958 99.59 306.3 6.4
Fluence J: 0.0044198 ± 1.38  ×  10−6 Weighted mean 40Ar/39Ar age: 323.1 2.0
PV-92-17: biotite from lamprophyre
Spot 1 93.822 0.074 2.084 0.063 0.012 0.032 −0.017 0.030 0.005 0.001 −0.117 0.206 −0.020 0.046 44.283 1.374 98.46 324.8 9.2
Spot 2 61.277 0.071 1.276 0.061 −0.047 0.031 0.058 0.026 0.001 0.001 0.659 0.301 −0.143 0.072 47.673 2.358 99.34 347.4 15.6
Spot 3 60.043 0.069 1.306 0.061 0.071 0.029 −0.052 0.027 0.001 0.001 −0.574 0.307 0.121 0.066 45.652 2.192 99.39 333.9 14.6
Fluence J: 0.0044538 ± 1.25  ×  10−6 Weighted mean 40Ar/39Ar age: 331.1 7.0
PLV-02-13b: adularia from microbreccia
Spot 1 238.730 0.085 4.923 0.061 0.063 0.028 0.009 0.028 0.122 0.002 0.022 0.072 −0.012 0.017 41.163 0.532 84.95 301.4 3.6
Spot 2 198.688 0.079 4.522 0.064 0.019 0.031 −0.056 0.027 0.023 0.001 −0.156 0.074 −0.026 0.020 42.423 0.622 96.63 309.9 4.2
Spot 3 262.817 0.083 5.307 0.060 0.110 0.029 −0.015 0.026 0.157 0.002 −0.037 0.063 0.009 0.016 40.742 0.484 82.33 298.6 3.3
Spot 4 220.511 0.083 4.853 0.062 0.066 0.030 −0.047 0.027 0.065 0.001 −0.122 0.071 −0.003 0.018 41.454 0.549 91.29 303.4 3.7
Spot 5 240.797 0.083 5.253 0.060 0.155 0.030 0.029 0.027 0.096 0.002 0.069 0.064 0.040 0.017 40.409 0.478 88.21 296.3 3.2
Spot 6 244.212 0.093 5.099 0.065 0.091 0.032 −0.002 0.027 0.106 0.002 −0.006 0.066 0.005 0.018 41.746 0.552 87.22 305.4 3.7
Fluence J: 0.0044178 ± 2.40  ×  10−6 Weighted mean 40Ar/39Ar age: 301.8 1.8

*Corrected for blank, mass discrimination, and radioactive decay. Sensitivity: 6.312  ×  10−17 ± 1.047 × 10−18 (mol/fAmp).

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