RRS Discovery D142
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Discovery (74E3) |
| Cruise identifier | D142 |
| Cruise period | 1983-11-20 — 1983-12-18 |
| Status | Completed |
| Port of departure | Dakar, Senegal |
| Port of return | Dakar, Senegal |
| Purpose | Research |
| Objectives | 1. To complete the GLORIA coverage of the Romanche Transform Fault.
2. To investigate the transverse ridges and troughs associated with the fracture zones and to determine their nature and origin. 3. To map the active plate boundary in St Paul Fracture Zone. 4. To gain experience in using the survey camera (WASP) with acoustic navigation and in rugged terrain. 5. To obtain GLORIA and other geophysical data on passage around Kane Gap and the Sierra Leone Rise for colleagues at University College, London, and the University of Kiel. |
| Chief scientist | Roger C Searle (Institute of Oceanographic Sciences Wormley Laboratory) |
| Cruise report |  (0.75 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) South East Atlantic Ocean (limit 20W) |
| Specific | Romanche and St. Paul’s Fracture Zones in equatorial Atlantic |
| Track charts |  |
| Measurements | |
| Meteorology | |
| Routine standard measurements | |
| Geology and geophysics | |
| Dredge | Quantity: number of deployments = 3 |
| Core - rock | Quantity: number of cores = 1 |
| Bottom photography | Quantity: number of deployments = 1 Description: about 1000 frames |
| Single-beam echosounding | Quantity: track kilometres = 7890 Description: SRP1 3.5 kHz |
| Multi-beam echosounding | Quantity: track kilometres = 7778 |
| Long/short range side scan sonar | Quantity: track kilometres = 7778 Description: GLORIA |
| Seismic refraction | Quantity: track kilometres = 5000 Description: SRP2 with 40 or 300 cu. in. Airgun |
