Sample % 39Ar 37Ar/39Ar 36Ar/39Ar 40Ar*/39Ar % 40*Ar Age (Ma) SD
DMS86-131 (61B)
5113-02 0.0448 0.00000 1.4809 100.0 7.444 0.676
5113-03 0.0378 0.00009 1.4396 98..1 7.237 1.051
5113-05 0.0435 0.00086 1.4823 85.4 7.451 0.489
5113-06 0.0322 0.00140 1.5301 78.7 7.691 0.761
5113-07 0.0413 0.00070 1.4200 87.3 7.138 0.787
Weighted Mean = 7.42 +/- 0.04 SE
5113-04 0.0004 0.00013 1.7669 97.8 8.878 0.637
5113-01 0.0096 0.00012 1.9729 98.2 9.910 0.335
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