Table T20. Summary of pressure coring operations at Site U1328.
| Core |
Core-top depth (mbsf) |
Length recovered* (cm) |
Length curated (cm) |
Pressure at core depth (MPa) |
Pressure recovered (MPa) |
Comments | |
|---|---|---|---|---|---|---|---|
| Logged† | Gauge‡ | ||||||
| 311-U1328B- | |||||||
| 4P | 14.5 | 98 | 77 | 12.9 | 15.1 | 5.0 | Unusual pressure rise while in ice shuck |
| 7P | 26.0 | 98 | 78 | 13.0 | 16.8 | 2.0 | Unusual pressure rise while in ice shuck |
| 311-U1328C- | |||||||
| 5P | 92.0 | 98 | 96 | 13.7 | 8.0 | 1.4 | Normal operation |
| 311-U1328D- | |||||||
| 3Y | 14.0 | 0 | 0 | 12.9 | 0 | — | No evidence of penetration |
| 311-U1328E- | |||||||
| 3E | 8.5 | 0 | 0 | 12.8 | 4.0 | 4.0 | Side valve leaked; gas hydrate in outer barrel |
| 5P | 15.1 | 0 | 0 | 12.9 | 0 | — | Actuator did not stroke after four attempts |
| 7Y | 25.7 | 87 | 87 | 13.0 | 0 | — | Large wireline tension during coring |
| 10P | 92.0 | 35 | 26 | 13.7 | 11.0 | 4.8 | Normal operation |
| 11Y | 197.0 | 90 | 90 | 14.7 | 0 | — | Large wireline tension during coring |
| 12E | 215.5 | 0 | 0 | 14.9 | 0 | — | Bit left bottom during coring; shattered liner |
| 13P | 233.0 | 98 | 94 | 15.0 | 5.8 | 5.4 | Normal operation |
Notes: Water depth at Site U1328 is 1267 mbsl. P = Pressure Core Sampler (PCS), Y = Fugro Percussion Corer (FPC), E = HYACE Rotary Corer (HRC). * = based on X-ray imaging and gamma ray density profiling prior to degassing. † = last pressure recorded before data logger disconnected from corer autoclave. Temperature 2°–4°C unless otherwise noted. ‡ = pressure measured when autoclave pressure transducer connected to computer (PCS cores) or external gauge (PCS, FPC, HRC cores). Pressure measured at 7°C unless otherwise noted. — = no data.
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