Table 1. Environmental DNA samples analyzed in this study.
| Borehole | Crustal age (Ma) | Depth | Fluid line | Sample |
Number of samples by year |
Total | |||
|---|---|---|---|---|---|---|---|---|---|
| 2008 | 2009a | 2010 | 2011 | ||||||
| 1025C | 1.2 | 0–46 msb | None | Basalt-hosted | — | — | 1 | — | 1 |
| U1301A | 3.5 | 8–107 msb | Stainless | Basalt-hosted | 4 | 4 | 9 | 3 | 20 |
| U1362A | 3.5 | 193–292 msb | Tefzel | Basalt-hosted | — | — | — | 3 | 3 |
| U1362B | 3.5 | 29–117 msb | Tefzel | Basalt-hosted | — | — | — | 4 | 4 |
| U1363 suite | NA | ~1–225 mbsf | NA | Sediment | — | — | 11 | — | 11 |
| NA | NA | ~2500–2650 mbsl | NA | Seawater | 2 | 3 | 10 | 5 | 20 |
Abbreviations: Ma, million years old; mbsf: meters below seafloor; mbsl: meters below sea-level; msb, meters sub-basement; NA, not applicable.
a
Samples from CORKs 1026B and U1301B were excluded because no high-quality samples were collected or analyzed.