Table 10.
Trace element chemistry of boulder samples analysed for cosmogenic36Cl, expressed in ppm. Cl is calculated using isotope dilution based on AMS data from PRIME Lab. Trace elements were analysed by ICP-OES with detection limits (ppm) as follows: 10 for B, Cr, Li; 0.1 for Sm, Th; 0.05 for Gd, U.
| Sample | Cl (±1σ) | B | Sm | Gd | U | Th | Cr | Li |
|---|---|---|---|---|---|---|---|---|
| UT_B-1 | 48.9 ± 4.2 | <10 | 2.0 | 2.53 | 0.17 | 0.7 | 521 | <10 |
| UT_B-2 | 458.7 ± 92.3 | <10 | 2.5 | 3.07 | 0.18 | 0.8 | 419 | <10 |
| UT_B-4 | 1243.6 ± 155.6 | <10 | 5.4 | 5.29 | 1.31 | 4.6 | 51 | 15 |
| NK-1 | 65.4 ± 0.6 | <10 | 1.7 | 2.02 | 0.22 | 0.8 | 395 | <10 |
| NK-2 | 270.3 ± 11.3 | <10 | 3.6 | 3.52 | 0.69 | 2.7 | 188 | 15 |
| NK-5 | 129.2 ± 1.5 | <10 | 2.4 | 2.92 | 0.59 | 1.8 | 63 | <10 |
| NK-7 | 66.7 ± 0.8 | <10 | 4.6 | 4.70 | 1.31 | 4.2 | 53 | 12 |
| NK-8 | 368.2 ± 17.4 | <10 | 3.5 | 3.79 | 0.47 | 2.0 | 422 | 17 |
| SA-1 | 33.6 ± 1.3 | <10 | 2.6 | 3.09 | 0.26 | 1.1 | 441 | <10 |
| SA-2 | 937.2 ± 62.8 | <10 | 2.5 | 2.76 | 0.69 | 2.0 | 46 | 11 |
| SA-3 | 28.5 ± 0.5 | <10 | 2.8 | 3.22 | 0.65 | 2.0 | 47 | 11 |
| SA-4 | 284.2 ± 11.4 | <10 | 3.9 | 4.21 | 0.82 | 3.1 | 236 | 12 |