1) 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.
David S Cronan (Imperial College London Department of Geology)
North East Atlantic Ocean (limit 40W) South East Atlantic Ocean (limit 20W)
Other chemical oceanographic measurements
Geology and geophysics
Quantity: number of deployments = 7 Description: rock dredge
Core - soft bottom
Quantity: number of cores = 47 Description: gravity corer;physical/chemical analysis;mineral resources