Details

Autor(en) / Beteiligte

• Anon
• Riedel, M
• Collett, TS
• Malone, MJ

Titel

Expedition 311 summary

Erscheinungsjahr

2005

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• A transect of four sites (U1325, U1326, U1327, and U1329) across the northern Cascadia margin was established during Integrated Ocean Drilling Program Expedition 311 to study the occurrences and formation of gas hydrate in accretionary complexes. In addition to the transect sites, a fifth site (U1328) was established at a cold vent with active fluid and gas flow. The four transect sites represent different stages in the evolution of gas hydrate across the margin from the earliest occurrence on the westernmost first accreted ridge (Site U1326) to its final stage at the eastward limit of gas hydrate occurrence on the margin in shallower water (Site U1329). Logging while drilling and measurement while drilling carried out prior to coring provided a set of measurements thatguided subsequent coring and special tool deployments at all five sites. Additional wireline logging at each site and two vertical seismic profiles at Sites U1327 and U1328 were completed. A totalof 1217.76 m of sediment core was recovered using the advanced piston corer and extended core barrel systems. Standard coring was interspersed with 24 (16 successful) pressure core sampler runs for onboard degassing experiments and 19 HYACINTH deployments, of which four were stored under in situ pressure for subsequent shore-based studies.