Cruise inventory

RRS Discovery D84

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD84
Cruise period1977-06-15 — 1977-07-28
Port of departureBarry, United Kingdom
Port of returnLisbon, Portugal
ObjectivesThe cruise was devoted to two main objectives (1+2) following along projects started in previous years and to several subsidiary objectives:
1) The study of tectonic processes in mid-ocean ridges and associated fracture zones
2) The evolution of King's Trough
3) Sediment transport mechanism in Rockall Trough
4) Collection of passage sonar and other geophysical data
5) First full operational use of GLORIA Mk II
6) First full operational use of the hull mounted retractable sonar pod
7) Acoustic navigation
Chief scientistAnthony S Laughton (Institute of Oceanographic Sciences Wormley Laboratory)
ProjectGeophysical and geological studies of the Chralie Gibbs Fracture Zone
Cruise reportRRS Discovery D84 cruise report d84.pdf — access key 'C' (16.80 MB)  RRS Discovery D84 cruise report d84_data_report.pdf (3.21 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Discovery D84 cruise track — trk2078.html
Chemical oceanography 
Other chemical oceanographic measurementsQuantity: number of samples = 1
Description: collection of large water samples for use by SSS
Routine standard measurementsDescription: 2-min.mean values
Geology and geophysics 
DredgeQuantity: number of deployments = 8
Core - soft bottomQuantity: number of cores = 7
Single-beam echosoundingQuantity: track kilometres = 8148.8
Description: 3.5kHz profilings
Multi-beam echosoundingQuantity: track kilometres = 12352
Long/short range side scan sonarQuantity: track kilometres = 8222
Description: and 4400nm gloria(long-range inclined asdic)
Single channel seismic reflectionQuantity: track kilometres = 6852
Seismic refractionQuantity: number of stations = 4
Description: sonobuoy stations
Gravity measurementsQuantity: track kilometres = 12352.84
Magnetic measurementsQuantity: track kilometres = 8556.24