RRS Discovery D125

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD125
Cruise period1982-01-30 — 1982-02-25
Port of departureBarry, United Kingdom
Port of returnGibraltar, Gibraltar
Objectives1. To sample the sediments above and below the carbonate compensation depth, mainly in the area Cape Verde distal abyssal plain/Mid Atlantic Ridge foothills, by means of a 2m Kastenlot corer and the IOS box corer.
2. To obtain pore water samples complementary to the sediments in (1) above by means of the IOS Mark II in situ pore water sampler and by squeezing sediment from box core subsamples.
3. To make detailed hydrographic casts of the upper ocean water column, and casts of the complete water column, for trace metal analysis. The metals of particular interest were manganese, iron and cadmium, the rare earth elements and aluminium.
4. To make tests of the new IOS in situ filtration device and to quantify and sample the particulate material of the water column with this device.
In addition, two secondary objectives, accepted on a 'ship of opportunity' basis, were:
5. To make a collection of surface seawater for the Standard Seawater Service, and,
6. To obtain expandable bathythermograph (XBT) records of the ocean mixed layer passage between the UK and the Azores.
Chief scientistJohn Thomson (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Discovery D125 cruise report d125.pdf (0.63 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorth Atlantic
Track chartsRRS Discovery D125 cruise track — trk2907.html
Physical oceanography 
BathythermographQuantity: number of profiles = 20
CTD stationsQuantity: number of stations = 21
Other physical oceanographic measurementsQuantity: number of stations = 4
Description: in situ particle sampling(filtration)
Chemical oceanography 
OxygenQuantity: number of stations = 6
PhosphateQuantity: number of stations = 6
SilicateQuantity: number of stations = 6
Trace elementsQuantity: number of stations = 6
Other chemical oceanographic measurementsQuantity: number of stations = 6
Description: chlorinity
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 2
Description: chemical analysis;1 geochronology
Multi-beam echosoundingQuantity: track kilometres = 7111.68