Table 6.
Electron Spin Resonance (ESR) ages on molluscs from stratigraphic sections at sites along the Bol'shaya Balaknya River, the Luktakh – Upper Taimyra – Logata river system and the Novorybnoye site (Fig. 1). More exact site locations are seen in Fig. 6 and Fig. 15 in Möller et al. [1], and stratigraphic positions of samples are indicated in sediment logs in Figs. 7, 8, 9, 12, 13, 16, 17, 18 and 20 in Möller et al. [1].
| Site | Coordinates | Site area | Sample no. | Sediment unit | Lab no. | Dated mollusc | m a.s.l. | Uin (ppm) | U (ppm) | Th (ppm) | K (%) | DΣ (mGy/a) | Ps (Gy) | ESR-age (ka) | Context |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bol'shaya | N73° 31,572' | 3 | BBR 6:13 | unit A2 | 435–061 | Macoma baltica | 51.0 | 0.18 | 1.04 | 5.56 | 1.75 | 1724 | 153.2 | 89.2 ± 7.6 | glaciomarine |
| Balaknya River 6 | E101° 0,610′ | ||||||||||||||
| Bol'shaya | N73° 39,224' | 4 | BBR 8:5 | unit A1 | 436–061 | Macoma baltica | 43.1 | 0.10 | 1.08 | 5.14 | 1.75 | 1947 | 165.1 | 85.1 ± 7.3 | marine |
| Balaknya River 8 | E102° 10,223′ | BBR 8:6 | unit A1 | 437–061 | Macoma baltica | 43.4 | 0.18 | 0.90 | 4.50 | 1.81 | 1909 | 162.9 | 85.6 ± 7.3 | marine | |
| BBR 8:9 | unit A1 | 438–061 | Macoma baltica | 45.9 | 0.10 | 0.86 | 4.09 | 1.46 | 1701 | 133.7 | 79.0 ± 9.4 | marine | |||
| Bol'shaya | N73° 27,236' | 6 | BBR 13:4 | unit C | 439–061 | Astarte borealis | 34.2 | 0.31 | 0.93 | 5.76 | 1.95 | 1751 | 739.0 | 430.0 ± 41.3 | |
| Balaknya River 13 | E104° 8,580′ | ||||||||||||||
| Bol'shaya | N73° 29,873' | 6 | BBR 14:3 | unit A2 | 440–061 | Macoma baltica | 28.7 | 0.18 | 0.49 | 1.72 | 1.91 | 1924 | 155.0 | 80.8 ± 8.6 | shallow marine |
| Balaknya River 14 | E104° 13,599′ | BBR 14:5 | unit A2 | 441–061 | Macoma baltica | 29.4 | 0.10 | 0.13 | 1.57 | 1.89 | 1824 | 148.4 | 81.5 ± 7.0 | shallow marine | |
| Bol'shaya | N73° 25,832' | 6 | BBR 15:1 | unit D | 442-061B1) | Macoma calcaria | 22.0 | 0.42 | 0.65 | 3.23 | 1.68 | 1677 | 386.8 | 228.0 ± 14.01) | glaciomarine |
| Balaknya River 15 | E104° 21,352′ | 442-061A1) | Astarte montagui | 0.10 | 0.65 | 3.23 | 1.68 | 1650 | 365.0 | ||||||
| BBR 15:3 | unit D | 443–061 | Hiatella arctica | 20.2 | 0.65 | 0.89 | 4.18 | 1.65 | 1614 | 371.4 | 232.0 ± 19.10 | glaciomarine | |||
| Bol'shaya | N73° 30.977' | 6 | BBR 16D:1 | unit C | 453–012 | Hiatella arctica | 35.2 | 0.24 | 0.79 | 6.39 | 1.87 | 1795 | 304.0 | 170.6 ± 14.5 | glaciomarine |
| Balaknya River 16A | E104° 33,069′ | ||||||||||||||
| Bol'shaya | N73° 37,084' | 7 | BBR 17A:1 | unit A | 444–061 | Portlandia arctica | 8.4 | 0.22 | 0.72 | 5.76 | 1.74 | 1919 | 199.2 | 104.5 ± 8.9 | marine |
| Balaknya River 17A | E105° 38,178′ | BBR 17A:2 | unit A | 445–061 | Portlandia arctica | 7.9 | 0.14 | 0.74 | 6.45 | 1.76 | 1771 | 178.3 | 101.0 ± 8.7 | marine | |
| BBR 17A:3 | unit A | 446–061 | Portlandia arctica | 12.4 | 0.16 | 0.64 | 5.53 | 1.63 | 1802 | 180.2 | 100.5 ± 12.0 | marine | |||
| Bol'shaya | N73° 37,314' | 7 | BBR 17B:2a | unit B | 447–061 | Portlandia arctica | 4.0 | 0.19 | 0.20 | 0.90 | 1.79 | 1761 | 214.3 | 122.3 ± 14.5 | redeposited marine |
| Balaknya River 17B | E105° 39,092′ | BBR 17B:2b | unit B | 447-061-OS2) | Portlandia arctica | 4.0 | 0.14 | 0.20 | 0.90 | 1.79 | 1753 | 214.3 | 123.0 ± 14.6 | redeposited marine | |
| Novorybnoye 1 | N72° 49,742' | 8 | Nov 1c:4 | unit B | 461–033 | undif fragm | 12.9 | 1.70 | 1.35 | 6.06 | 1.93 | 741.0 | 1.93 | 311.7 ± 24.8 | glaciomarine |
| E105° 47,142' | Nov 1c:7 | unit D | 481–103 | undif fragm | 19.0 | 0.95 | 1.38 | 6.93 | 1.88 | 2101 | 421.0 | 202.0 ± 19.1 | glaciomarine | ||
| Novorybnoye 2 | N72° 49,650' | 8 | Nov 2:1 | unit E2 | 466–033 | Hiatella arctica | 16.5 | 0.36 | 0.17 | 0.61 | 1.27 | 1153 | 153.5 | 131.0 ± 11.0 | shoreface marine |
| E105° 47,073′ | |||||||||||||||
| Luktakh River 1-3 | N72°59.585’ | 9 | LuR 2:1 | unit A | 465–033 | Hiatella arctica | 54.2 | 1.20 | 1.22 | 5.90 | 1.67 | 1577 | 112.7 | 71.7 ± 5.9 | glaciomarine |
| E92°07.511′ | LuR3:1 | unit A | 482–103 | Hiatella arctica | 59.1 | 0.40 | 1.01 | 5.83 | 1.64 | 1376 | 110.3 | 80.5 ± 6.8 | glaciomarine | ||
| LuR3:2 | unit A | 483–103 | Hiatella arctica | 58.1 | 0.13 | 1.06 | 5.92 | 1.95 | 1857 | 160.6 | 86.8 ± 7.5 | glaciomarine | |||
| Luktakh River 4 | N72° 59,084' | 9 | LuR 4:2 | unit A2 | 487–103 | Hiatella arctica | 56.7 | 0.18 | 0.87 | 3.89 | 1.70 | 1456 | 171.5 | 118.5 ± 10.1 | shallow marine |
| E92° 12,187′ | LuR 4:5 | unit A3 | 484–103 | Hiatella arctica | 58.5 | 0.57 | 0.45 | 2.56 | 1.78 | 1380 | 131.2 | 95.5 ± 8.0 | shallow marine | ||
| Luktakh River 5 | N73° 0,944’ | 9 | LuR 5:1 | Unit A | 477–103 | Hiatella arctica | 58.6 | 2.46 | 1.34 | 4.55 | 1.48 | 1730 | 135.7 | 78.7 ± 6.2 | glaciomarine |
| E92°05,528′ | LuR 5:2 | unit A | 479–103 | Hiatella arctica | 58.6 | 1.53 | 1.33 | 4.07 | 1.50 | 1569 | 126.3 | 80.8 ± 6.5 | glaciomarine | ||
| Luktakh River 6a | N72° 51,161' | 10 | LuR 6a:5 | unit C2 | 476–103 | Macoma baltica | 48.0 | 0.94 | 0.80 | 3.86 | 1.86 | 1917 | 149.0 | 78.0 ± 6.5 | glaciomarine |
| E92° 28,957′ | LuR 6a:6 | unit C2 | 486–103 | Macoma baltica | 45.8 | 0.42 | 1.42 | 4.9 | 1.79 | 1940 | 165.2 | 85.5 ± 7.3 | glaciomarine | ||
| Luktakh River 6b | N72°51,132′ | LuR 6b:1 | unit C2 | 488–103 | Macoma ? (fragm) | 32.1 | 0.72 | 0.71 | 4.31 | 1.65 | 1652 | 141.5 | 86.0 ± 9.6 | glaciomarine | |
| E92°28,797′ | LuR 6b:2 | unit C2 | 478–103 | Hiatella arctica | 31.3 | 0.45 | 1.34 | 4.73 | 1.69 | 1620 | 140.7 | 86.7 ± 7.3 | glaciomarine | ||
| LuR 6b: 5 | unit C2 | 470–043 | Hiatella arctica | 29.8 | 0.35 | 1.08 | 4.1 | 1.44 | 1158 | 106.3 | 92.1 ± 7.8 | glaciomarine | |||
| LuR 6b:6 | unit C1 | 471–043 | Hiatella arctica | 29.1 | 0.33 | 0.66 | 2.20 | 1.32 | 1151 | 94.3 | 82.2 ± 7.0 | glaciomarine | |||
| Luktakh River 8 | N72° 51,910' | 11 | LuR 8:1 | unit A | 462–033 | Hiatella arctica | 18.2 | 0.61 | 0.81 | 4.59 | 1.65 | 1377 | 120.2 | 87.3 ± 7.3 | marine |
| E93° 27,623′ | LuR 8:2 | unit A | 485–103 | Hiatella arctica | 21.7 | 0.28 | 0.65 | 4.28 | 1.99 | 1161 | 108.0 | 93.4 ± 9.1 | marine | ||
| Luktakh River 9 | N72° 48,826′ | 11 | LuR 9b:1 | unit B | 475–103 | Hiatella arctica | 43.7 | 0.57 | 0.91 | 3.17 | 1.17 | 1113 | 100.5 | 90.6 ± 7.5 | beach-face marine |
| E93° 22,093′ | LuR 9b:2 | unit B | 472–103 | Hiatella arctica | 43.5 | 0.32 | 0.72 | 2.29 | 1.22 | 1139 | 103.8 | 91.5 ± 7.7 | beach-face marine | ||
| Logata River 1 | N73° 06,77’ | 14 | LoR 1:1 | unit A | 463–033 | Hiatella arctica | 20.2 | 0.66 | 1.27 | 5.77 | 1.87 | 1980 | 206.1 | 104.5 ± 8.8 | glaciomarine |
| E96° 09,367′ | |||||||||||||||
| Logata River 2 | N73° 03,773’ | 14 | LoR 2:1 | unit A | 467–033 | Hiatella arctica | 27.6 | 0.31 | 1.25 | 5.37 | 1.9 | 1498 | 116.5 | 78.0 ± 6.6 | glaciomarine |
| E96° 20,492′ | LoR 2:2 | unit A | 468–033 | Hiatella arctica | 26.4 | 0.40 | 1.28 | 4.93 | 1.70 | 1325 | 109.1 | 82.6 ± 7.0 | glaciomarine | ||
| LoR 2:4 | unit A | 469–033 | Hiatella arctica | 22.0 | 0.61 | 0.88 | 4.86 | 1.72 | 1300 | 121.4 | 93.7 ± 7.8 | glaciomarine |
All ESR dates were carried out by Dr. A. Molodkov at the Research Laboratory for Quaternary Geochronology, Institute of Geology, Tallin Technical University, Estonia.
Notes: Uin is the uranium content in shells; U, Th, K are the uranium, thorium and potassium content in sediments; DΣ is the total dose rate; Ps is the palaeodose.
1)
Two shells of different species from the same sample were analyzed, and mean age taken.
2)
The sample was dated by the ESR open system (ESR-OS) method (Molodkov, 1988).