Cruise inventory

RRS Discovery D103

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD103
Cruise period1979-07-09 — 1979-07-25
Port of departureDjibouti, Djibouti
Port of returnSuez, Egypt
Objectives1. To conduct a tectonic study of the Gulf of Aden fracture zones, especially the Alula Fartak trench. This was intended to form the major part of the Ph.D. thesis of one of the cruise participants, D. Tamsett.
2. To investigate any changes in tectonic and volcanic patterns along the Gulf of Aden spreading axis in the vicinity of the Gulf of Tadjourah.
3. To conduct a reconnaissance survey with Gloria in the Red Sea. It was hoped in particular that Gloria would produce new data on the tectonics of the salt deposits there, and the nature of the Pliocene rifting which produced the axial trough.
4. To obtain cores from the Atlantis II Deep area of the Red Sea for geochemical studies at Imperial College.
Chief scientistRoger C Searle (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Discovery D103 cruise report d103.pdf — access key 'C' (0.81 MB) 
Ocean/sea areas 
GeneralRed Sea
Gulf of Aden
Track chartsRRS Discovery D103 cruise track — trk2322a.html RRS Discovery D103 cruise track — trk2322b.html
Routine standard measurementsDescription: 10 minutes readings logged automatically
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 10
Single-beam echosoundingQuantity: 380
Multi-beam echosoundingQuantity: track kilometres = 5428
Long/short range side scan sonarQuantity: track kilometres = 4778
Single channel seismic reflectionQuantity: track kilometres = 3824
Gravity measurementsQuantity: track kilometres = 5063
Magnetic measurementsQuantity: track kilometres = 3973