RRS Discovery D142

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD142
Cruise period1983-11-20 — 1983-12-18
Port of departureDakar, Senegal
Port of returnDakar, Senegal
Objectives1. 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 scientistRoger C Searle (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Discovery D142 cruise report d142.pdf (0.75 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
South East Atlantic Ocean (limit 20W)
SpecificRomanche and St. Paul’s Fracture Zones in equatorial Atlantic
Track chartsRRS Discovery D142 cruise track — trk2922.html
Routine standard measurements
Geology and geophysics 
DredgeQuantity: number of deployments = 3
Core - rockQuantity: number of cores = 1
Bottom photographyQuantity: number of deployments = 1
Description: about 1000 frames
Single-beam echosoundingQuantity: track kilometres = 7890
Description: SRP1 3.5 kHz
Multi-beam echosoundingQuantity: track kilometres = 7778
Long/short range side scan sonarQuantity: track kilometres = 7778
Description: GLORIA
Seismic refractionQuantity: track kilometres = 5000
Description: SRP2 with 40 or 300 cu. in. Airgun