Table 1.
Composition of the samples and raw sediment Fe K-edge Linear combination fitting results.
| Sediment | Depth (cm) | Total OC content (wt%) | C/N(a) | δ13C (‰) | Sediment total Fe content (mg Fe/g sed) | Free iron oxide contribution to total sediment Fe (wt%) | Iron-OM complex contribution to total sediment Fe (wt%) | Residual non-reactive Fe contribution to total sediment Fe (wt%) | Sum of all fitting components (%) | OC bound to Fe(b) (% of total OC) |
|---|---|---|---|---|---|---|---|---|---|---|
| Saanich Inlet | 0–20 | 2.21 | 7.51 | −22.4 | 23.1 | 10.8 ± 2.2(c) | 18.1 ± 2.6 | 72.0 ± 4.9 | 101 | 28.09 |
| Arabian Sea | 0–0.5 | 1.11 | 8.04 | −21.6 | 17.3 | 26.5 ± 7.1 | 16.6 ± 6.3 | 57.4 ± 1.6 | 101 | 26.89 |
| Madeira Abyssal Plain turbidite | 119–121 | 0.29 | 15.04 | −21.9 | 39.8 | 68.6 ± 5.7 | 12.5 ± 6.1 | 11.7 ± 1.6 | 93 | NA |
| Black Sea | 0–0.5 | 4.61 | 15.69 | −26.6 | 33.3 | 0.0 ± 3.7 | 8.1 ± 1.0 | 90.4 ± 3.4 | 99 | 24.98 |
| Mexican Margin (Station 306) | 0–0.5 | 6.66 | 9.27 | −22.1 | 30.7 | 15.1 ± 1.9 | 7.8 ± 0.7 | 74.6 ± 2.3 | 98 | 22.31 |
| Mexican Margin (Station 305) | 0–0.5 | 2.82 | 9.00 | −21.5 | 35.4 | 19.4 ± 5.0 | 6.7 ± 0.6 | 76.0 ± 2.2 | 102 | 12.70 |
| Southern Ocean | 8–12 | 0.33 | 8.27 | −20.8 | 7.7 | 14.8 ± 4.9 | 5.3 ± 0.9 | 82.2 ± 3.9 | 102 | 29.00 |
| St. Lawrence Estuary | 0–35 | 1.43 | 12.83 | −24.3 | 32.6 | 12.8 ± 0.4 | 5.1 ± 1.3 | 80.6 ± 1.6 | 99 | 25.13 |
| Equatorial Pacific 0°N | 0–0.5 | 0.27 | 8.26 | −21.6 | 3.2 | 40.4 ± 5.1 | —(d) | 61.1 ± 1.1 | 102 | 34.79 |
| Arctic Margin | 0–1 | 1.18 | 7.35 | −26.2 | 50.9 | 41.1 ± 3.5 | — | 56.9 ± 1.3 | 98 | 7.60 |
| Equatorial Pacific 9°N | 10–12 | 0.30 | 4.58 | −22.4 | 35.7 | 13.9 ± 2.0 | — | 87.6 ± 4.6 | 102 | 12.16 |
(a)Atomic C/N ratio.
(b)Percent of total sediment OC associated to reducible iron oxides taken from ref. 7.
(c)1σ errors for the fitting results.
(d)Component not used in the combinatorial linear fitting calculations.