Table 4
Summary of morphological and geochemical characteristics of Mn nodules from the East Siberian Arctic shelf
| Stations | ARA12B-St52 (Water depth 150 m) | ARA12B-St58i (Water depth 73 m) | |
|---|---|---|---|
| Size | small (< 3 cm) | 26.8% | 4.5% |
| medium (3-6 cm) | 51.9% | 62.2% | |
| large (> 6 cm) | 21.3% | 33.3% | |
| Shape | Spherical | 2.9% | - |
| Ellipsoidal | 15.1% | 1.0% | |
| Tabular | 37.7% | 82.6% | |
| Tube | 18.8% | 7.0% | |
| Irregular | 25.1% | 9.5% | |
| Polynucleate | 0.4% | - | |
| Surface | Color | yellow to brown | brown to black |
| Texture | smooth | rough | |
| Mn/Fe ratio | Mn layer | 28.2 (13.9-41.5) | 6.1 (1.5-22.1) |
| Fe layer | 0.5 (0.0-1.3) | 0.3 (0.0-1.5) | |
| Mapping composition | 7.9 (7.1-8.3) | 0.6 (0.0-1.1) | |
Econ. Environ. Geol. 2023;56:1~11 https://doi.org/10.9719/EEG.2023.56.1.1
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