Sample % 39Ar 37Ar/39Ar 36Ar/39Ar 40Ar*/39Ar % 40*Ar Age (Ma) SD
DMS87-26 (20)
1789-01 0.0612 0.00340 4.0970 80.3 10.527 0.444
1789-04B 0.0594 0.00246 4.2367 85.4 10.885 0.244
1789-08 0.0306 0.00100 4.4163 93.8 11.345 0.156
1789-10 0.1089 0.00715 4.4398 67.8 11.405 0.904
1789-04 0.0325 0.00076 4.6559 95.4 11.958 0.309
Weighted Mean = 11.27 +/- 0.12 SE
1789-03 0.0251 0.02461 3.5761 33.0 9.192 1.038
1789-06 0.0415 0.00114 5.2939 94.0 13.590 0.577
1789-05 0.0159 0.00334 57.7469 98.3 142.987 0.478
1789-02 0.0254 0.00699 94.4336 97.9 228.273 0.679
1789-07 0.0391 0.00305 103.7365 99.1 249.273 0.521
1789-09 0.0415 0.00376 125.2737 99.1 296.973 0.570
1789-02B 0.0184 0.00276 125.6885 99.4 297.880 0.728
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