RRS Shackleton S2/83

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Shackleton (74SF)
Cruise identifierS2/83
Cruise period1983-01-26 — 1983-03-17
Port of departureGibraltar, Gibraltar
Port of returnDakar, Senegal
Objectives1) To look for hydrothermal deposits, particularly sulphides in the fracture zones and at fracture zone-ridge-crest intersections.

2) To collect sediment samples from the fracture zones in order to assess the relative importance of hydrogenous, diagenetic and hydrothermal processes in contolling sediment composition in different areas of the fracture zones

3) To collect sediment samples from several traverses across the Mid-Atlantic Ridge between fracture zones in order to investigate whether hydrothermal activity exists at the ridge crest and to characterise element dispersion away from any such centres of activity.

4) To collect samples of ferromanganese encrustations from fracture zone walls in order to assess the influence on their composition in different areas of hydrogenous and hydrothermal element supply.
Chief scientistDavid S Cronan (Imperial College London Department of Geology)
Cruise reportRRS Shackleton S2/83 cruise report shackleton2_83.pdf (0.45 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
South East Atlantic Ocean (limit 20W)
Track chartsRRS Shackleton S2/83 cruise track — trk2863.html RRS Shackleton S2/83 cruise track — trk2863a.html
Chemical oceanography 
Other chemical oceanographic measurements
Geology and geophysics 
DredgeQuantity: number of deployments = 7
Description: rock dredge
Core - soft bottomQuantity: number of cores = 47
Description: gravity corer;physical/chemical analysis;mineral resources
In-situ seafloor measurement/sampling
Multi-beam echosoundingQuantity: track kilometres = 926
Magnetic measurementsQuantity: track kilometres = 926