Sample % 39Ar 37Ar/39Ar 36Ar/39Ar 40Ar*/39Ar % 40*Ar Age (Ma) SD
DMS87-113 (20)
1794-01 0.1144 0.00175 4.2405 89.2 10.894 0.104
1794-08 0.0432 0.00078 4.4076 95.1 11.322 0.088
1794-02 0.1265 0.00102 4.4810 93.8 11.510 0.085
Weighted Mean = 11.28 +/- 0.05 SE
1794-04 0.0643 0.00416 57.5321 97.9 142.476 0.576
1794-06 0.0340 0.00262 57.7051 98.7 142.888 0.440
1794-03 0.0174 0.00738 75.8994 97.2 185.690 0.334
1794-09 0.0176 0.00358 87.4462 98.8 212.337 0.365
1794-05 0.0365 0.00238 98.9741 99.3 238.553 0.799
1794-07 0.0313 0.01340 102.5835 96.3 246.683 0.846
DMS86-113 (Glass/41B)
5089-01A 0.5 0.2980 0.00081 2.8567 92.9 14.718 3.439
5089-01B 22.1 0.1209 0.00079 2.4965 91.7 12.369 0.146
5089-01C 54.4 0.1142 0.00031 2.5066 96.8 12.920 0.060
5089-01D 20.8 0.1366 0.00005 2.4822 99.7 12.795 0.141
5089-01E 2 0.4047 0.00079 2.3834 92.0 12.287 2.688
Plateau Age = 12.90 +/- 0.06 SE
Irradiation Data
20 J=0.001428 +/- 0.000001
41B J=0.005920 +/- 0.000009
61B J=0.002783 +/- 0.000002
61A2 J=0.002844 +/- 0.000004
98A J=0.000478 +/- 0.000001