RRS Charles Darwin CD9B

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD9B
Cruise period1985-12-06 — 1986-01-06
Port of departureLisbon, Portugal
Port of returnGlasgow, United Kingdom
ObjectivesThe cruise represented a continuation of the DoE research programme on oceanic radioactive waste disposal. The objectives were:
1. To use TOBI to provide detailed sidescan sonar and a high resolution sediment profiler survey.
2. To use TOBI over the area of faults that had been intensively studied in previous cruises.
3. Pop-Up Pore Pressure Instruments (PUPPIs) were to be deployed in order to determine in-situ hydraulic gradients and hence infer pore-water movemtns (if any) in the sediments.
4. Heat flow measurements along two traverses.
5. WASP camera runs over an abyssal hill to delineate field of manganese nodules.
6. Kasten, piston and box coring to obtain samples for further study of manganese nodules.
7. Kasten and piston coring to obtain samples for geotechnical testing.
8. Seismic reflection profiling.
9. Attempt to delineate the 20 m deep sand layer.
10. Laying of a mooring containing sediment traps in the GME area for the IOS Biology group.
11. Recovery of a mooring containing an Automatic Listening Station (ALS) for IOS Marine Physics Group.
12. Recovery of a seabed camera (Bathysnap) for IOS biologists.
Chief scientistRoger C Searle (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Charles Darwin CD9B cruise report cd9b.pdf (1.15 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificGreat Meteor East/ Madeira Abyssal Plain
Track chartsRRS Charles Darwin CD9B cruise track — trk3103.html
Geology and geophysics 
Core - soft bottomQuantity: number of deployments = 4
Bottom photographyQuantity: number of stations = 3
In-situ seafloor measurement/samplingQuantity: number of deployments = 5
Description: in-situ sediment pore pressure
Multi-beam echosoundingQuantity: track kilometres = 4000
Single channel seismic reflectionQuantity: track kilometres = 800
Magnetic measurementsQuantity: track kilometres = 4000