Table 3.
Summary of organic carbon content and stable carbon isotope composition of seafloor basalt samples after incubation.
| ID | Time (h) | OC wt % | δ13C-OC (‰) | (13C/12C) × 102 | Δ 13C/12C | Δ ng 13C/grock | Δ nmol C/grock/d |
|---|---|---|---|---|---|---|---|
| JdF2009 | T0 | 0.040 | -19.5 | 1.096 | n.a. | n.a. | n.a. |
| 1.25 | 0.032 | -21.4 | 1.094 | b.d.l. | – | – | |
| 1.25 | 0.034 | -21.1 | 1.094 | b.d.l. | – | – | |
| 23.75 | 0.028 | -19.5 | 1.096 | b.d.l. | – | – | |
| 23.75 | 0.022 | -7.2 | 1.110 | 1.4 × 10-4 | 41 | 12.7 | |
| 23.75 | 0.027 | -19.9 | 1.096 | b.d.l. | – | – | |
| 139.75 | 0.023 | 6.1 | 1.125 | 2.9 × 10-4 | 86 | 4.5 | |
| 139.75 | 0.043 | -17.9 | 1.098 | 1.9 × 10-5 | 6 | 0.3 | |
| Ula Nui | T0 | 0.044 | -20.4 | 1.095 | n.a. | n.a. | n.a. |
| 1 | 0.113 | -22.1 | 1.093 | b.d.l. | – | – | |
| 1 | 0.061 | -21.2 | 1.094 | b.d.l. | – | – | |
| 1 | 0.041 | -16.3 | 1.100 | 4.6 × 10-5 | 27 | 92.5 | |
| 24.25 | 0.050 | -17.2 | 1.099 | 3.5 × 10-5 | 21 | 3.0 | |
| 24.25 | 0.059 | -19.6 | 1.096 | b.d.l. | – | – | |
| 24.25 | 0.040 | -20.1 | 1.095 | b.d.l. | – | – | |
| 124.25 | 0.043 | -19.9 | 1.096 | b.d.l. | – | – | |
| 124.25 | 0.057 | -13.6 | 1.103 | 7.6 × 10-5 | 44 | 1.2 | |
| 124.25 | 0.074 | -18.2 | 1.098 | 2.5 × 10-5 | 15 | 0.4 | |
| Marker 2 | T0 | 0.043 | -21.1 | 1.094 | n.a. | n.a. | n.a. |
| 1 | 0.078 | -21.4 | 1.094 | b.d.l. | – | – | |
| 1 | 0.086 | -16.1 | 1.100 | 5.7 × 10-5 | 33 | 114.3 | |
| 24 | 0.035 | -22.1 | 1.093 | b.d.l. | – | – | |
| 24 | 0.042 | -19.1 | 1.097 | 2.3 × 10-5 | 13 | 1.9 | |
| 24 | 0.063 | -19.7 | 1.096 | b.d.l. | – | – | |
| 124.25 | 0.029 | -9.3 | 1.108 | 1.3 × 10-4 | 77 | 2.2 | |
| 124.25 | 0.052 | -10.5 | 1.106 | 1.2 × 10-4 | 69 | 1.9 | |
| 124.25 | 0.095 | -10.8 | 1.106 | 1.2 × 10-4 | 67 | 1.9 | |
| J2-626-R1 | T0 | 0.027 | -22.9 | 1.092 | n.a. | n.a. | n.a. |
| 118.5 | 0.032 | -16.3 | 1.100 | 7.4 × 10-5 | 39 | 1.0 | |
| 118.5 | 0.012 | -6.1 | 1.111 | 1.9 × 10-4 | 100 | 2.4 | |
| 118.5 | 0.027 | -19.1 | 1.097 | 4.2 × 10-5 | 23 | 0.6 | |
| 237 | 0.102 | 14.3 | 1.134 | 4.2 × 10-4 | 220 | 2.7 | |
| 237 | 0.032 | -16.0 | 1.100 | 7.7 × 10-5 | 41 | 0.5 | |
| 237 | 0.105 | 49.1 | 1.173 | 8.0 × 10-4 | 426 | 5.2 | |
| 480 | n.d. | 82.6 | 1.210 | 1.2 × 10-3 | 625 | 3.8 | |
| 480 | 0.101 | 51.1 | 1.175 | 8.3 × 10-4 | 438 | 2.6 | |
| 480 | 0.043 | 54.8 | 1.179 | 8.7 × 10-4 | 461 | 2.8 | |
| J2-627-R3 | 118.5 | 0.024 | -18.0 | 1.098 | b.d.l. | – | – |
| 118.5 | 0.027 | 22.6 | 1.143 | 4.5 × 10-4 | 109 | 2.7 | |
| 118.5 | 0.020 | 58.1 | 1.183 | 8.5 × 10-4 | 204 | 5.0 | |
| 237 | 0.020 | -0.1 | 1.118 | 2.0 × 10-4 | 48 | 0.6 | |
| 237 | 0.022 | 27.2 | 1.148 | 5.1 × 10-4 | 121 | 1.5 | |
| 237 | 0.019 | 9.3 | 1.128 | 3.1 × 10-4 | 73 | 0.9 | |
| 480 | 0.019 | 32.4 | 1.154 | 5.6 × 10-4 | 135 | 0.8 | |
| 480 | 0.021 | 15.6 | 1.135 | 3.8 × 10-4 | 90 | 0.5 | |
| 480 | 0.038 | 30.5 | 1.152 | 5.4 × 10-4 | 130 | 0.8 | |
b.d.l., below detection limit; n.a., not applicable; n.d., not determined. See text for details.