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RRS Discovery D84
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Discovery (74E3) |
Cruise identifier | D84 |
Cruise period | 1977-06-15 — 1977-07-28 |
Status | Completed |
Port of departure | Barry, United Kingdom |
Port of return | Lisbon, Portugal |
Purpose | Research |
Objectives | The 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 scientist | Anthony S Laughton (Institute of Oceanographic Sciences Wormley Laboratory) |
Project | Geophysical and geological studies of the Chralie Gibbs Fracture Zone |
Cruise report | (16.80 MB) (3.21 MB) |
Ocean/sea areas | |
General | North East Atlantic Ocean (limit 40W) |
Track charts | |
Measurements | |
Chemical oceanography | |
Other chemical oceanographic measurements | Quantity: number of samples = 1 Description: collection of large water samples for use by SSS |
Meteorology | |
Routine standard measurements | Description: 2-min.mean values |
Geology and geophysics | |
Dredge | Quantity: number of deployments = 8 |
Core - soft bottom | Quantity: number of cores = 7 |
Single-beam echosounding | Quantity: track kilometres = 8148.8 Description: 3.5kHz profilings |
Multi-beam echosounding | Quantity: track kilometres = 12352 |
Long/short range side scan sonar | Quantity: track kilometres = 8222 Description: and 4400nm gloria(long-range inclined asdic) |
Single channel seismic reflection | Quantity: track kilometres = 6852 |
Seismic refraction | Quantity: number of stations = 4 Description: sonobuoy stations |
Gravity measurements | Quantity: track kilometres = 12352.84 |
Magnetic measurements | Quantity: track kilometres = 8556.24 |