Fig 1.
Fig 2.
Fig 3.
Fig 4.
Fig 5.
Results of ESR dating for the Wufeng, Qingqu, and Yunyang Basin terraces in the upper Han River valley_
| Sampling profile | Terrace level | Sample no. | Above sea level (m) | Thick of the profile | U (ppm) | Th (ppm) | K (%) | Water content (%) | Dose rate (Gy/ka) | De (Gy) | Age (ka) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Wufeng terrace profile | T3 | WFT3ESR | 215 | 9 | 3.00 ± 0.11 | 15.20 ± 0.05 | 2.07 ± 0.08 | 18 ± 3 | 3.04 ± 0.15 | 1269 ± 145 | 417 ± 48 |
| T4 | WFT4ESR | 235 | 10 | 2.57 ± 0.11 | 14.10 ± 0.05 | 2.91 ± 0.05 | 17 ± 3 | 3.58 ± 0.18 | 2246 ± 348 | 627 ± 97 | |
| T5 | WFT5ESR | 277 | 15 | 2.35 ± 0.11 | 12.41 ± 0.05 | 2.47 ± 0.05 | 18 ± 3 | 3.05 ± 0.15 | 3371 ± 556 | 1105 ± 182 | |
| Qingqu terrace profile | T3 | QUT3ESR | 175 | 14 | 2.90 ± 0.11 | 14.80 ± 0.05 | 1.97 ± 0.05 | 16 ± 3 | 3.00 ± 0.15 | 1214 ± 123 | 405 ± 41 |
| T4 | QUT4ESR | 203 | 5 | 2.65 ± 0.11 | 13.30 ± 0.05 | 2.15 ± 0.05 | 17 ± 3 | 2.96 ± 0.15 | 1840 ± 227 | 622 ± 77 | |
| T5 | QUT5ESR | 249 | 23 | 2.06 ± 0.11 | 13.29 ± 0.05 | 2.25 ± 0.05 | 16 ± 3 | 2.96 ± 0.15 | 3343 ± 359 | 1129 ± 121 | |
| Yunayng basin terrace profile | T3 | YYT3ESR | 165 | 20 | 3.00 ± 0.11 | 15.40 ± 0.05 | 1.98 ± 0.05 | 18 ± 3 | 2.98 ± 0.15 | 1258 ± 199 | 422 ± 67 |
| T3 | YYT3ESR | 167 | 20 | 2.90 ± 0.11 | 16.00 ± 0.05 | 1.96 ± 0.05 | 18 ± 3 | 2.98 ± 0.15 | 1194 ± 175 | 401 ± 59 | |
| T4 | YYT4ESR | 232 | 24 | 2.57 ± 0.11 | 13.70 ± 0.05 | 2.22 ± 0.05 | 16 ± 3 | 3.07 ± 0.15 | 1905 ± 161 | 621 ± 52 | |
| T5 | YYT5ESR | 274 | 6 | 2.34 ± 0.11 | 11.8 ± 0.05 | 2.39 ± 0.05 | 18 ± 3 | 2.96 ± 0.15 | 3261 ± 475 | 1102 ± 160 | |
| T5 | YYT5ESR | 275 | 6 | 2.41 ± 0.11 | 11.81 ± 0.05 | 2.47 ± 0.05 | 17 ± 3 | 3.07 ± 0.15 | 3375 ± 360 | 1099 ± 117 |