Tableau 5
Datations du plancher sommital. 7 est le plancher supérieur, 8 le plancher inférieur. Les constantes de décroissance sont : λ238 = 1,55125 × 10−10 (Jaffey et al., 1971), λ234 = 2,82206 × 10−6 (Cheng et al., 2013), λ230 = 9,1705 × 10−6 (Cheng et al., 2013). Les concentrations en 232Th sont très faibles ; néanmoins, une correction a été appliquée sur l’âge.
Datings of the upper flowstone. 7 is the upper flowstone, 8 is the lower flowstone. The decay constants are λ238 = 1.55125 × 10−10 (Jaffey et al., 1971), λ234 = 2.82206 × 10−6 (Cheng et al., 2013), λ230 = 9.1705 × 10−6 (Cheng et al., 2013). The concentrations in 232Th are very weak. Nevertheless, the ages are corrected.
| Échantillon | Teneur 238U (ppb) | Teneur 232Th (ppb) | 230Th/232Th | Age (ans BP) |
|---|---|---|---|---|
| 7 | 359 ± 0,4 | 46,3 ± 0,9 | 56 ± 1 | 53 851 ± 2493 |
| 8 | 518 ± 0,7 | 34,3 ± 0,7 | 122 ± 2 | 61 542 ± 1235 |
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