Title: Aliquot
Author: scs35
Last saved by: Tamzin Anderson
Company: The Open University

TABLE 1. ^40Ar/^39Ar laserprobe step heating data for the aliquots of impact glass. ( x10^10, cm^3 STP). J value = 0.01385±0.000069. All uncertainties are reported as absolute values, and on individual isotope measurements are at the 1σ confidence level. The final ages are 2σ and are absolute values. All measurements were carried out at The Open University.

Aliquot

Step

^40Ar

±

^39Ar

±

^38Ar

±

^37Ar

±

^36Ar

±

% ^39Ar

^40Ar*/^39Ar

±

Age 
(Ma)

±

1 | 1 | 28.9985 | 0.3403 | 14.6735 | 0.0935 | 0.1236 | 0.0195 | 1.8950 | 0.2077 | 0.0000 | 0.0185 | 0.348 | 2.3218 | 0.3731 | 57.1 | 9.0
| 2 | 85.4553 | 0.7355 | 58.8655 | 0.1218 | 0.7494 | 0.0195 | 8.8788 | 0.2078 | 0.0413 | 0.0185 | 1.742 | 1.2442 | 0.0936 | 30.8 | 2.3
| 3 | 338.5408 | 0.7665 | 250.1962 | 0.1483 | 3.1172 | 0.0207 | 37.4353 | 0.2079 | 0.1544 | 0.0189 | 7.669 | 1.1707 | 0.0225 | 29.0 | 0.6
| 4 | 460.0760 | 1.0097 | 346.6599 | 0.2176 | 4.3688 | 0.0249 | 55.5687 | 0.2080 | 0.1700 | 0.0189 | 15.88 | 1.1822 | 0.0164 | 29.3 | 0.4
| 5 | 680.1671 | 1.1051 | 531.8826 | 0.2140 | 6.5492 | 0.0478 | 65.4275 | 0.2081 | 0.1466 | 0.0201 | 28.48 | 1.1973 | 0.0113 | 29.7 | 0.3
| 6 | 1181.4711 | 3.0799 | 949.5882 | 0.2510 | 11.4641 | 0.0859 | 135.4656 | 0.2082 | 0.1895 | 0.0201 | 50.98 | 1.1852 | 0.0070 | 29.4 | 0.2
| 7 | 926.0994 | 1.1610 | 734.9783 | 0.2737 | 8.7017 | 0.0306 | 105.4101 | 0.2083 | 0.2246 | 0.0189 | 68.39 | 1.1697 | 0.0078 | 29.0 | 0.2
| 8 | 595.7863 | 1.4651 | 490.1301 | 0.1818 | 5.2976 | 0.0552 | 52.0909 | 0.2085 | 0.0998 | 0.0201 | 80 | 1.1554 | 0.0125 | 28.6 | 0.3
| 9 | 1008.7057 | 0.8645 | 804.8690 | 0.5678 | 9.2279 | 0.0442 | 100.4892 | 0.2086 | 0.2129 | 0.0189 | 99.07 | 1.1751 | 0.0071 | 29.1 | 0.2
| 10 | 58.2505 | 0.2874 | 39.4648 | 0.0955 | 0.4305 | 0.0195 | 5.1911 | 0.2088 | 0.0062 | 0.0189 | 100 | 1.4293 | 0.1416 | 35.4 | 3.5
2 | 1 | 226.7144 | 0.6007 | 84.3005 | 0.0865 | 1.1005 | 0.0201 | 14.9041 | 0.1538 | 0.3680 | 0.0169 | 4.637 | 1.3993 | 0.0595 | 34.6 | 1.5
| 2 | 260.5281 | 0.6575 | 164.1096 | 0.0541 | 2.1011 | 0.0201 | 27.1828 | 0.1539 | 0.1886 | 0.0169 | 13.67 | 1.2479 | 0.0306 | 30.9 | 0.8
| 3 | 350.5745 | 0.5142 | 227.2877 | 0.1048 | 2.7428 | 0.0254 | 35.4150 | 0.1539 | 0.2471 | 0.0169 | 26.17 | 1.2211 | 0.0220 | 30.3 | 0.6
| 4 | 948.0947 | 0.8641 | 699.5062 | 0.5056 | 8.1082 | 0.0445 | 106.8217 | 0.1540 | 0.3368 | 0.0182 | 64.65 | 1.2131 | 0.0078 | 30.1 | 0.2
| 5 | 867.7274 | 0.7164 | 565.5141 | 0.2452 | 6.9043 | 0.0445 | 94.1593 | 0.1541 | 0.6254 | 0.0169 | 95.76 | 1.2076 | 0.0089 | 29.9 | 0.3
| 6 | 173.5022 | 0.5490 | 77.1119 | 0.1780 | 0.9770 | 0.0201 | 14.7258 | 0.1542 | 0.2627 | 0.0164 | 100 | 1.2432 | 0.0633 | 30.8 | 1.6
3 | 1 | 30.4401 | 0.1686 | 6.5584 | 0.0368 | 0.0644 | 0.0101 | 1.0126 | 0.0539 | 0.0422 | 0.0109 | 0.241 | 2.7377 | 0.4918 | 67.1 | 11.8
| 2 | 256.3248 | 0.1917 | 116.6992 | 0.0596 | 1.4317 | 0.0123 | 23.2474 | 0.0539 | 0.3971 | 0.0116 | 4.537 | 1.1908 | 0.0294 | 29.5 | 0.7
| 3 | 532.4626 | 0.2143 | 329.6753 | 0.1847 | 4.1981 | 0.0257 | 57.1734 | 0.0539 | 0.4556 | 0.0116 | 16.67 | 1.2067 | 0.0104 | 29.9 | 0.3
| 4 | 539.2621 | 0.1574 | 311.6129 | 0.2006 | 3.6480 | 0.0123 | 42.8037 | 0.0540 | 0.3738 | 0.0134 | 28.14 | 1.3761 | 0.0127 | 34.1 | 0.4
| 5 | 435.5649 | 0.1672 | 300.2392 | 0.2364 | 3.6241 | 0.0220 | 46.0621 | 0.0540 | 0.2646 | 0.0116 | 39.19 | 1.1904 | 0.0114 | 29.5 | 0.3
| 6 | 318.8659 | 0.2141 | 216.4301 | 0.1066 | 2.6594 | 0.0123 | 40.3344 | 0.0540 | 0.1749 | 0.0116 | 47.16 | 1.2346 | 0.0158 | 30.6 | 0.4
| 7 | 1299.5169 | 0.7089 | 923.3835 | 0.4569 | 11.2176 | 0.0605 | 167.5265 | 0.0541 | 0.5609 | 0.0116 | 81.15 | 1.2278 | 0.0038 | 30.4 | 0.2
| 8 | 670.9593 | 0.4297 | 426.5600 | 0.2205 | 5.2185 | 0.0220 | 76.9245 | 0.0541 | 0.5336 | 0.0116 | 96.85 | 1.2033 | 0.0081 | 29.8 | 0.2
| 9 | 205.0995 | 0.1522 | 85.5859 | 0.0629 | 1.0171 | 0.0101 | 13.6600 | 0.0542 | 0.2880 | 0.0134 | 100 | 1.4022 | 0.0463 | 34.7 | 1.1
Ave. blank | | 1.88976 | 0.06944 | 0.02232 | 0.00248 | 0.02976 | 0.00496 | 0.0868 | 0.00992 | 0.0372 | 0.01116 | | | | |