Table T3. 40Ar-39Ar data on multi-grain 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 (10 grains) J = 0.0006101 | |||||||||||
0.30 | 0.01374 | 0.01450 | 0.000439 | 0.03466 | 8.5112 | 136.0 | 2.5 | 52.3 | 43.0 | 0.789 | 0.00867 |
2.50 | 0.00133 | 0.03723 | 0.000143 | 0.02990 | 3.3837 | 106.9 | 3.3 | 88.4 | 37.1 | 2.350 | 0.00328 |
Fuse | 0.00051 | 0.04146 | 0.000163 | 0.01609 | 1.6506 | 99.7 | 5.7 | 90.8 | 19.9 | 4.86 | 0.00692 |
Total fusion (1) | 118.1 | 2.2 | 2.18 | 0.00632 | |||||||
0.30 | 0.01404 | 0.00830 | 0.000314 | 0.03309 | 8.4940 | 139.0 | 5.5 | 51.2 | 56.9 | 0.473 | 0.00650 |
2.50 | 0.00119 | 0.03091 | 0.000052 | 0.01802 | 2.0829 | 102.8 | 3.2 | 83.1 | 31.0 | 3.24 | 0.00196 |
Fuse | 0.00042 | 0.03406 | 0.000071 | 0.00709 | 0.6157 | 74.9 | 8.7 | 80.0 | 12.2 | 9.06 | 0.00688 |
Total fusion (2) | 120.1 | 3.5 | 2.38 | 0.00051 | |||||||
0.30 | 0.02017 | 0.01207 | — | 0.03612 | 11.519 | 161.9 | 5.7 | 48.2 | 29.6 | 0.631 | — |
2.50 | 0.00180 | 0.05099 | 0.000067 | 0.07003 | 7.2389 | 102.4 | 1.1 | 92.6 | 57.4 | 1.37 | 0.00066 |
Fuse | 0.00046 | 0.05466 | 0.000038 | 0.01578 | 1.5827 | 98.2 | 4.2 | 91.4 | 12.9 | 6.54 | 0.00165 |
Total fusion (3) | 119.7 | 2.0 | 1.82 | 0.00059 | |||||||
0.30 | 0.02409 | 0.02868 | 0.000092 | 0.02794 | 11.149 | 152.1 | 4.8 | 36.1 | 45.2 | 1.94 | 0.00225 |
2.50 | 0.00183 | 0.02217 | 0.000069 | 0.02346 | 3.0580 | 114.4 | 3.5 | 82.3 | 38.0 | 1.78 | 0.00202 |
Fuse | 0.00054 | 0.05684 | 0.000241 | 0.01038 | 1.0980 | 97.0 | 4.8 | 85.6 | 16.8 | 10.3 | 0.01591 |
Total fusion (4) | 128.7 | 2.7 | 3.29 | 0.00446 | |||||||
0.30 | 0.02450 | 0.01838 | 0.000358 | 0.05449 | 13.852 | 128.9 | 5.0 | 47.7 | 35.1 | 0.636 | 0.00449 |
2.50 | 0.00307 | 0.07396 | 0.000060 | 0.07290 | 10.531 | 139.7 | 1.9 | 91.4 | 47.0 | 1.91 | 0.00057 |
Fuse | 0.00172 | 0.06871 | 0.000382 | 0.02773 | 5.0944 | 173.4 | 4.5 | 90.0 | 17.9 | 4.68 | 0.00944 |
Total fusion (5) | 142.0 | 2.3 | 1.96 | 0.00353 | |||||||
178-1103A-36R-3, 4-8 (30 grains) J = 0.0006055 | |||||||||||
0.30 | 0.02190 | 0.17832 | 0.01513 | 0.1689 | 9.0580 | 16.65 | 0.77 | 28.6 | 41.5 | 1.99 | 0.0614 |
2.50 | 0.01486 | 0.36118 | 0.01043 | 0.1671 | 6.4099 | 13.2 | 1.1 | 31.5 | 41.0 | 4.08 | 0.0427 |
Fuse | 0.00630 | 0.27847 | 0.00486 | 0.07110 | 3.3325 | 22.5 | 1.2 | 44.1 | 17.5 | 7.39 | 0.0468 |
Total fusion (1) | 16.23 | 0.59 | 3.79 | 0.0512 | |||||||
0.30 | 0.02043 | 0.15718 | 0.01710 | 0.2049 | 8.8648 | 15.02 | 0.91 | 31.9 | 42.1 | 1.45 | 0.0572 |
2.50 | 0.00616 | 0.32642 | 0.01194 | 0.2089 | 6.1354 | 22.43 | 0.47 | 70.3 | 42.9 | 2.95 | 0.0391 |
Fuse | 0.00306 | 0.18759 | 0.00398 | 0.07323 | 2.4822 | 23.4 | 1.1 | 63.5 | 15.0 | 4.83 | 0.0373 |
Total fusion (2) | 19.46 | 0.48 | 2.60 | 0.0465 | |||||||
0.30 | 0.04537 | 0.12835 | 0.01421 | 0.1702 | 15.534 | 13.6 | 2.9 | 13.7 | 38.5 | 1.42 | 0.0572 |
2.50 | 0.00773 | 0.18650 | 0.02103 | 0.2715 | 4.8246 | 10.19 | 0.31 | 52.6 | 61.5 | 1.30 | 0.0531 |
Total fusion (3)** | 11.5 | 1.1 | 1.35 | 0.0547 | |||||||
0.30 | 0.01987 | 0.06365 | 0.00609 | 0.08790 | 9.0946 | 39.6 | 2.8 | 35.4 | 20.8 | 1.37 | 0.0475 |
2.50 | 0.00767 | 0.31486 | 0.01122 | 0.2565 | 13.4346 | 46.95 | 0.36 | 83.1 | 60.8 | 2.32 | 0.0300 |
Fuse | 0.00997 | 0.19887 | 0.00379 | 0.07734 | 5.7798 | 39.60 | 0.97 | 49.0 | 18.3 | 4.85 | 0.0336 |
Total fusion (4) | 44.07 | 0.71 | 2.58 | 0.0343 | |||||||
0.30 | 0.01496 | 0.17008 | 0.01488 | 0.16764 | 6.2791 | 12.07 | 1.06 | 29.6 | 61.6 | 1.91 | 0.0608 |
2.50 | 0.00514 | 0.15854 | 0.00548 | 0.06959 | 2.0038 | 7.58 | 0.71 | 24.1 | 25.6 | 4.30 | 0.0540 |
Fuse | 0.00180 | 0.14358 | 0.00254 | 0.03503 | 0.8175 | 8.9 | 1.8 | 34.8 | 12.9 | 7.73 | 0.0497 |
Total fusion (5) | 10.51 | 0.72 | 3.27 | 0.0576 | |||||||
0.20 | 0.00184 | 0.02750 | 0.00334 | 0.03966 | 1.0643 | 14.3 | 2.1 | 48.9 | 9.1 | 1.31 | 0.0578 |
2.50 | 0.01212 | 0.38295 | 0.01959 | 0.3174 | 8.7263 | 17.62 | 0.66 | 58.9 | 72.4 | 2.28 | 0.0423 |
Fuse | 0.00261 | 0.15455 | 0.00351 | 0.08111 | 2.6734 | 25.4 | 1.3 | 71.1 | 18.5 | 3.60 | 0.0297 |
Total fusion (6) | 18.77 | 0.58 | 2.43 | 0.0413 | |||||||
0.30 | 0.00381 | 0.08094 | 0.00876 | 0.12325 | 3.2553 | 18.77 | 0.79 | 65.4 | 36.9 | 1.24 | 0.0487 |
2.50 | 0.00789 | 0.27852 | 0.00915 | 0.17038 | 4.7174 | 15.23 | 0.84 | 50.6 | 51.0 | 3.08 | 0.0368 |
Fuse | 0.00114 | 0.06187 | 0.00199 | 0.04021 | 0.8526 | 14.0 | 1.1 | 60.5 | 12.0 | 2.90 | 0.0340 |
Total fusion (7) | 16.39 | 0.54 | 2.38 | 0.0408 | |||||||
0.30 | 0.00784 | 0.10476 | 0.00931 | 0.13349 | 3.9554 | 13.4 | 1.1 | 41.4 | 42.3 | 1.48 | 0.0478 |
2.50 | 0.00434 | 0.16440 | 0.00804 | 0.12308 | 3.1241 | 16.3 | 1.8 | 59.0 | 39.0 | 2.52 | 0.0447 |
Fuse | 0.00392 | 0.12439 | 0.00302 | 0.05883 | 1.7934 | 11.8 | 2.7 | 35.4 | 18.7 | 3.99 | 0.0351 |
Total fusion (8) | 14.20 | 0.97 | 2.35 | 0.0442 | |||||||
0.30 | 0.01589 | 0.10916 | 0.00947 | 0.1407 | 7.7633 | 23.7 | 1.1 | 39.5 | 40.6 | 1.46 | 0.0461 |
2.50 | 0.00805 | 0.19166 | 0.00822 | 0.1372 | 4.9662 | 20.48 | 0.68 | 52.1 | 39.6 | 2.64 | 0.0410 |
Fuse | 0.00271 | 0.08859 | 0.00242 | 0.06851 | 3.9967 | 50.2 | 1.4 | 79.9 | 19.8 | 2.44 | 0.0242 |
Total fusion (9) | 27.69 | 0.59 | 2.12 | 0.0398 | |||||||
178-1103A-31R-2, 0-4 cm (30 grains) J = 0.0006015 | |||||||||||
0.80 | 0.05528 | 0.18844 | 0.01771 | 0.2999 | 21.902 | 20.03 | 0.70 | 25.4 | 79.2 | 1.19 | 0.0404 |
1.80 | 0.01147 | 0.07760 | 0.00227 | 0.05063 | 4.3841 | 21.2 | 5.2 | 22.7 | 13.4 | 2.89 | 0.0307 |
Fuse | 0.00322 | 0.04598 | 0.00116 | 0.02791 | 2.0102 | 40.7 | 2.0 | 52.7 | 7.4 | 3.11 | 0.0284 |
Total fusion (1) | 21.72 | 0.91 | 1.56 | 0.0383 | |||||||
0.90 | 0.06668 | 0.37257 | 0.02675 | 0.3651 | 25.650 | 17.59 | 0.68 | 23.2 | 67.6 | 1.93 | 0.0502 |
2.40 | 0.00835 | 0.12221 | 0.00520 | 0.08370 | 4.2266 | 22.65 | 0.80 | 41.6 | 15.5 | 2.76 | 0.0426 |
Fuse | 0.01026 | 0.20752 | 0.00478 | 0.09120 | 5.5567 | 29.8 | 2.0 | 45.4 | 16.9 | 4.29 | 0.0359 |
Total fusion (2) | 20.44 | 0.60 | 2.45 | 0.0466 | |||||||
0.40 | 0.03091 | 0.11609 | 0.01054 | 0.1747 | 12.691 | 22.0 | 1.7 | 28.0 | 47.1 | 1.25 | 0.0413 |
2.50 | 0.01274 | 0.17526 | 0.00608 | 0.1562 | 6.3921 | 18.16 | 0.81 | 41.1 | 42.1 | 2.12 | 0.0267 |
Fuse | 0.00470 | 0.06368 | 0.00210 | 0.04029 | 2.2810 | 23.9 | 3.1 | 39.1 | 10.9 | 2.98 | 0.0357 |
Total fusion (3) | 20.58 | 0.92 | 1.80 | 0.0345 | |||||||
0.40 | 0.05939 | 0.13952 | 0.00993 | 0.1998 | 24.144 | 35.47 | 0.78 | 27.3 | 65.9 | 1.32 | 0.0340 |
2.50 | 0.00478 | 0.10570 | 0.00275 | 0.07833 | 4.0605 | 36.3 | 1.4 | 65.2 | 25.8 | 2.55 | 0.0240 |
Fuse | 0.00246 | 0.04932 | 0.00076 | 0.02521 | 1.9288 | 51.0 | 5.3 | 62.3 | 8.3 | 3.69 | 0.0206 |
Total fusion (4) | 36.98 | 0.80 | 1.83 | 0.0303 | |||||||
0.30 | 0.04550 | 0.12811 | 0.01406 | 0.2473 | 21.474 | 34.89 | 0.86 | 37.4 | 41.4 | 0.98 | 0.0389 |
2.50 | 0.02261 | 0.26826 | 0.01300 | 0.2623 | 15.501 | 36.12 | 0.69 | 56.9 | 43.9 | 1.93 | 0.0339 |
Fuse | 0.00750 | 0.11478 | 0.00321 | 0.08825 | 6.9419 | 57.2 | 1.4 | 68.1 | 14.8 | 2.45 | 0.0249 |
Total fusion (5) | 38.74 | 0.56 | 1.61 | 0.0347 | |||||||
0.30 | 0.02806 | 0.10043 | 0.01123 | 0.1591 | 11.676 | 22.9 | 1.2 | 29.0 | 37.3 | 1.19 | 0.0483 |
2.50 | 0.01684 | 0.22645 | 0.00888 | 0.1960 | 10.997 | 33.02 | 0.47 | 54.7 | 46.0 | 2.18 | 0.0310 |
Fuse | 0.00551 | 0.10905 | 0.00288 | 0.07129 | 4.4072 | 41.8 | 1.1 | 63.0 | 16.7 | 2.89 | 0.0277 |
Total fusion (6) | 30.73 | 0.56 | 1.93 | 0.0369 | |||||||
0.30 | 0.00820 | 0.05156 | 0.00727 | 0.1091 | 4.5880 | 21.4 | 1.1 | 47.2 | 28.1 | 0.891 | 0.0456 |
2.50 | 0.00956 | 0.21198 | 0.00940 | 0.2039 | 7.5544 | 24.99 | 0.76 | 62.6 | 52.5 | 1.96 | 0.0316 |
Fuse | 0.00388 | 0.11014 | 0.00291 | 0.07534 | 3.3410 | 31.3 | 1.3 | 65.7 | 19.4 | 2.76 | 0.0265 |
Total fusion (7) | 25.22 | 0.59 | 1.82 | 0.0345 | |||||||
0.30 | 0.00704 | 0.07496 | 0.00578 | 0.1071 | 5.2186 | 31.51 | 0.80 | 60.1 | 39.9 | 1.32 | 0.0370 |
2.50 | 0.00479 | 0.17473 | 0.00591 | 0.1343 | 6.2567 | 38.68 | 0.89 | 77.3 | 50.1 | 2.45 | 0.0302 |
Fuse | 0.00148 | 0.04707 | 0.00109 | 0.02677 | 1.4380 | 40.1 | 3.9 | 69.5 | 10.0 | 3.32 | 0.0280 |
Total fusion (8) | 35.96 | 0.71 | 2.09 | 0.0327 | |||||||
0.30 | 0.00690 | 0.08108 | 0.00761 | 0.1164 | 4.2148 | 20.2 | 1.3 | 51.6 | 45.4 | 1.31 | 0.0448 |
2.50 | 0.00745 | 0.14725 | 0.00604 | 0.1150 | 4.4063 | 20.7 | 1.3 | 50.0 | 44.8 | 2.42 | 0.0360 |
Fuse | 0.00181 | 0.03534 | 0.00152 | 0.02524 | 1.3063 | 32.9 | 4.8 | 59.1 | 9.8 | 2.64 | 0.0414 |
Total fusion (9) | 21.65 | 0.94 | 1.94 | 0.0405 | |||||||
0.30 | 0.00567 | 0.09547 | 0.00780 | 0.1307 | 3.8572 | 18.0 | 1.2 | 56.5 | 45.8 | 1.38 | 0.0409 |
2.50 | 0.00581 | 0.15897 | 0.00508 | 0.1148 | 4.3240 | 24.48 | 0.91 | 60.3 | 40.2 | 2.61 | 0.0303 |
Fuse | 0.00200 | 0.04540 | 0.00135 | 0.03992 | 1.9852 | 37.5 | 2.4 | 70.3 | 14.0 | 2.15 | 0.0231 |
Total fusion (10) | 23.35 | 0.76 | 1.98 | 0.0342 | |||||||
0.30 | 0.00390 | 0.04440 | 0.00399 | 0.07704 | 2.9107 | 24.6 | 1.9 | 60.4 | 33.6 | 1.09 | 0.0354 |
2.50 | 0.00939 | 0.16839 | 0.00617 | 0.1287 | 6.3955 | 30.3 | 1.3 | 56.6 | 56.1 | 2.47 | 0.0329 |
Fuse | 0.00119 | 0.03267 | 0.00088 | 0.02378 | 1.1781 | 37.4 | 2.4 | 70.2 | 10.4 | 2.59 | 0.0252 |
Total fusion (11) | 29.1 | 1.0 | 2.02 | 0.0329 |
Notes: ** = the final step was lost for a technical reason. Argon data are x 10-15 moles. — = undetectable.