Table T2. 40Ar-39Ar data on milligram-sized fractions.

Laser power (W)
36Ar(atm)
37Ar(Ca)
38Ar(Cl)
39Ar(K)
40Ar(Total)
Age
(Ma)
±2
40Ar*%
39Ar(K)%
Ca/K
Cl/K
178-1097A-27R-1, 35-58 cm, (6.8 mg) J = 0.0006101            
0.08 0.5065 0.07628 0.00022 0.5295 203.02 107.6 7.1 26.3 4.8 0.272 0.00029
0.13 0.6018 0.1418 — 0.6239 287.90 184.4 4.3 38.2 5.6 0.429 —
0.15 0.2365 0.1259 0.00754 0.5314 171.28 198.7 6.9 59.2 4.8 0.447 0.00972
0.20 0.1187 0.1715 0.00149 0.6055 129.58 164.1 4.7 72.9 5.4 0.534 0.00169
0.25 0.09528 0.2114 — 0.6324 107.03 132.3 1.6 73.7 5.7 0.631 —
0.30 0.08558 0.2501 0.00117 0.6553 102.31 124.9 1.4 75.3 5.9 0.720 0.00123
0.35 0.06339 0.2577 0.00041 0.5202 76.382 118.0 1.0 75.5 4.7 0.935 0.00054
0.45 0.06109 0.3246 0.00058 0.4733 69.118 115.00 0.83 73.9 4.3 1.29 0.00084
0.60 0.06048 0.4942 0.00131 0.5502 75.897 112.47 0.78 76.4 4.9 1.69 0.00163
0.75 0.02948 0.5939 0.00148 0.5500 67.078 113.17 0.67 87.0 4.9 2.04 0.00184
0.90 0.01465 0.4952 0.00187 0.4605 53.084 112.9 1.0 91.8 4.1 2.03 0.00278
1.10 0.01006 0.4256 0.00157 0.3930 44.343 112.3 1.1 93.3 3.5 2.04 0.00273
1.40 0.01494 0.6543 0.00375 0.6838 71.918 105.49 0.72 93.9 6.1 1.81 0.00376
1.70 0.00994 0.4497 0.00217 0.4855 48.773 101.02 0.85 94.0 4.4 1.75 0.00307
2.60 0.00815 0.5518 0.00367 0.5497 53.683 99.85 0.88 95.5 4.9 1.89 0.00458
3.60 0.01705 1.0199 0.00540 0.9635 96.192 101.22 0.62 94.8 8.7 2.00 0.00384
5.50 0.01836 1.3583 0.00537 0.9619 95.001 99.67 0.53 94.3 8.6 2.66 0.00382
Fuse 0.04297 3.7023 0.01073 0.9528 111.74 110.9 3.4 88.6 8.6 7.33 0.00772
Total fusion         121.92 0.95     1.92 0.00300
178-1103A-36R-3, 4-8 cm (10.7 mg) J = 0.0006055          
0.08 0.7636 0.3982 0.07294 0.5833 261.36 65.7 6.2 13.7 2.5 1.29 0.0856
0.13 0.1923 0.3108 0.04580 0.4830 63.961 16.0 1.4 11.1 2.1 1.21 0.0650
0.18 0.2051 0.6588 0.07713 0.9566 74.588 15.89 0.34 18.7 4.1 1.30 0.0552
0.22 0.07506 0.4938 0.05619 0.7571 35.201 18.69 0.43 37.0 3.2 1.23 0.0508
0.30 0.1462 1.0358 0.09445 1.3786 67.210 18.92 0.33 35.7 5.9 1.42 0.0469
0.35 0.06298 0.9182 0.07011 1.0602 38.180 20.05 0.52 51.2 4.5 1.63 0.0453
0.45 0.06697 1.2394 0.09074 1.2766 43.523 20.20 0.46 54.5 5.4 1.83 0.0487
0.55 0.06117 1.2327 0.07837 1.1887 39.649 19.72 0.50 54.4 5.1 1.96 0.0452
0.70 0.05123 1.3936 0.07764 1.1721 35.807 19.16 0.42 57.7 5.0 2.24 0.0454
0.90 0.07611 2.3047 0.1084 1.7368 54.257 19.87 0.27 58.5 7.4 2.50 0.0428
1.10 0.03768 1.4264 0.06051 0.9939 28.573 19.06 0.50 61.0 4.2 2.71 0.0417
1.60 0.1014 3.3451 0.1128 1.9914 70.534 22.12 0.30 57.5 8.5 3.17 0.0388
1.90 0.02449 0.8622 0.03147 0.5473 17.954 21.3 1.5 59.7 2.3 2.97 0.0394
2.60 0.02572 0.7042 0.02622 0.4567 16.310 20.7 1.7 53.4 1.9 2.91 0.0393
3.20 0.1533 3.1166 0.09724 1.5713 73.572 19.54 0.54 38.4 6.7 3.74 0.0424
3.70 0.08756 1.9973 0.05948 0.9816 43.246 19.23 0.86 40.2 4.2 3.84 0.0415
4.20 0.04822 1.2277 0.03612 0.5909 25.074 19.90 0.70 43.2 2.5 3.92 0.0419
6.50 0.1762 5.8179 0.1266 1.9562 88.240 20.09 0.34 41.0 8.3 5.61 0.0443
Fuse 0.3797 12.044 0.1998 3.7537 203.49 26.37 0.47 44.9 16.0 6.05 0.0365
Total fusion       21.89 0.24     3.26 0.0445

Notes: Argon data x 10 -15 moles. — = undetectable.