Cruise inventory

RRS Charles Darwin CD56

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD56
Cruise period1991-02-11 — 1991-03-13
StatusCompleted
Port of departureSanta Cruz de Tenerife, Spain
Port of returnSanta Cruz de Tenerife, Spain
PurposeResearch
ObjectivesThe specific objectives of the UWCC cruise on RRS Darwin were as follows:
1. To improve our knowledge of the processes transporting sediments on continental margins; particularly with regard to the origin, pathways and ultimate destination of the sediments, and the differing roles played by sediment slides and debris flows versus turbidiity currents.
2. To examine in detail the flow, erosional, and depositional processes associated with the Saharan Sediment Slide (Embley, 1976) and its associated debris flows and the turbidity current channel systems on the Saharan continental rise.
3. To elucidate the timing of the flow events, and the extent to which the slide was a single or multi-phase event.
4. To determine the interactions between slide processes and turbidity current processes, and in particular the extent to which the slide generated turbidity currents.
The main tool to tackle these objectives was to be the TOBI sidescan and profiler which would be used in at least two detailed study areas on the continental rise that had been selected from existing GLORIA data. The surveys were to be bottom transponder-navigated and were to be supplemented by precisely navigated core sampling and bottom camera runs with the WASP vehicle.
Subsiduary objectives related to: studies of diagenetic processes in the upper few meters of pelagic sediments in this region of the North Atlantic basin, as part of UWCC's involvement in the B.O.F.S community programme: and geotechnical investigations of slope stability around the Canaries.
Chief scientistRobert B Kidd (University College Cardiff Geology Department)
Cruise reportRRS Charles Darwin CD56 cruise report cd56.pdf — access key 'C' (0.42 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNW Africa
Track chartsRRS Charles Darwin CD56 cruise track — trk3627.html
Measurements 
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 6
Description: Box and Kasten cores, pore water extraction on ship
Core - soft bottomQuantity: number of cores = 12
Description: Piston cores, p-wave logged on board ship
Core - soft bottomQuantity: number of cores = 13
Description: Kasten cores, geotechnical measurements aboard ship
Bottom photographyQuantity: track kilometres = 9.26
Description: WASP survey camera runs
Geophysical measurements made at depthQuantity: track kilometres = 360
Description: TOBI sidescan and profiler (deep tows)
Geophysical measurements made at depthQuantity: track kilometres = 360
Description: TOBI magnetometer
Single-beam echosoundingQuantity: track kilometres = 3240
Description: SIMRAD wide beam echosounder
Single-beam echosoundingQuantity: track kilometres = 3240
Description: 3.5kHz high resolution seismic/echo sounder profiles
Single channel seismic reflectionQuantity: track kilometres = 770
Description: single channel air gun profiles (analogue and digital)