Table 7. Analytical results of chemical and isotopic compositions of brucite-carbonate chimneys in the SSF.
| Sample name | SUP#_dive#-ID# | Type* | Site | Part | Carbonate* | Organic matter | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| δ13C | δ18O | TOC | δ13C | TN | δ15N | TOC/TN | |||||
| (‰) | (‰) | (wt.%) | (‰) | (wt.%) | (‰) | (atomic ratio) | |||||
| Chim 6* | 12541–14001_6K1404-R05 | I | CH Site 4 | Inner of the root section | n.a. | n.a. | 0.012 | −26.0 | 0.001 | +6.3 | 23.8 |
| Inner of the lower section | +23.6 | +2.8 | 0.019 | −26.3 | 0.001 | +7.5 | 22.2 | ||||
| Inner of the lower section | 0.026 | −27.3 | 0.002 | +11.4 | 15.2 | ||||||
| Inner of the lower section | 0.011 | −27.2 | 0.001 | +5.5 | 13.8 | ||||||
| Inner of the middle section | +13.9 | +3.1 | 0.016 | −26.3 | 0.001 | +3.9 | 28.5 | ||||
| Inner of the upper section | +12.7 | +3.4 | 0.014 | −26.4 | 0.001 | −1.6 | 15.0 | ||||
| Surface of the root section | n.a. | n.a. | 0.055 | −23.5 | 0.007 | −3.6 | 9.5 | ||||
| Surface of the lower section | +23.6 | +2.8 | 0.084 | −29.7 | 0.012 | −1.4 | 7.9 | ||||
| Surface of the middle section | +13.9 | +3.1 | 0.047 | −30.3 | 0.007 | −2.2 | 7.5 | ||||
| Surface of the upper section | +12.7 | +3.1 | 0.046 | −25.4 | 0.006 | −2.3 | 8.8 | ||||
| Chim 5* | 12541–14001_6K1404-R04 | I | CH Site 4 | Surface of the root section | −1.5 | +3.1 | 0.072 | −22.8 | 0.012 | −2.8 | 7.0 |
| Surface of the middle section | −8.8 | +3.4 | 0.144 | −29.3 | 0.028 | −2.3 | 6.0 | ||||
| Surface of the upper section | −0.3 | +5.2 | 0.026 | −28.0 | 0.006 | −3.7 | 5.2 | ||||
| Chim 4* | 12541–14001_6K1402-R01 | II (porous) | CH Site 3 | Inner of the root section | +0.5 | +3.7 | 0.026 | −13.5 | 0.003 | −4.7 | 10.1 |
| Inner of the root section | n.a. | n.a. | 0.019 | −19.0 | 0.002 | −2.5 | 11.1 | ||||
| Inner of the root section | n.a. | n.a. | 0.255 | −31.5 | 0.053 | −2.3 | 5.6 | ||||
| Surface of the chimney with tube worm | −0.3 | +3.7 | 0.156 | −16.0 | 0.026 | −2.7 | 7.0 | ||||
| Surface of the chimney with decomposed shell of tube worms | +0.1 | +3.7 | 0.170 | −14.2 | 0.022 | −3.9 | 9.0 | ||||
| Surface of the root section | n.a. | n.a. | 0.471 | −29.5 | 0.100 | −2.0 | 5.5 | ||||
| Chim 2* | 12541–12001_6K1365-R01 | II (lithified) | CH Site 1 | Inner (center of the chimney) of the middle section | +22.3 | +4.0 | 0.043 | −31.5 | 0.003 | +0.4 | 16.7 |
| Inner (1 cm from the center) of the middle section | +19.7 | +4.0 | 0.032 | −32.3 | 0.002 | −0.4 | 18.7 | ||||
| Inner (2 cm from the center) of the middle section | +13.6 | +3.8 | 0.033 | −35.9 | 0.002 | 0.0 | 19.3 | ||||
| Inner (3 cm from the center) of the middle section | +22.4 | +3.6 | 0.024 | −33.8 | 0.002 | +3.0 | 14.0 | ||||
| Inner (4 cm from the center) of the middle section | +19.1 | +3.4 | 0.016 | −32.3 | 0.001 | +1.3 | 18.7 | ||||
| Surface (5 cm from the center) of the middle section | +11.3 | +3.2 | 0.053 | −20.2 | 0.007 | +8.0 | 8.8 | ||||
| Surface (6 cm from the center) of the middle section | +2.9 | +5.3 | 0.089 | −18.8 | n.a. | +3.5 | n.a. | ||||
n.a.; not analyzed
*; Chimney ID listed in Okumura et al., 2016a [10]