RRS Discovery D235C

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD235C
Cruise period1998-07-15 — 1998-08-03
Port of departureSouthampton, United Kingdom
Port of returnSouthampton, United Kingdom
ObjectivesMulti-channel seismic investigation of the accretionary processes at the Reykjanes Ridge (Mid-Atlantic Ridge). To detail the geometry and extent of the crustal melt body already imaged duirng CD81 on the RRS Charles Darwin.
Main tasks:
1. Acquire 34 across-axis and 5 along-axis multi-channel seismic profiles over an axial volcanic ridge segment.
2. Acquire gravity and magnetic data along all profiles.
3. Acquire 24 XBT measurements.
4. Test deployment of a low-frequency electromagnetic underwater receiver (LEMUR).
Chief scientistChristine Peirce (University of Durham, Department of Geological Sciences)
Cruise reportRRS Discovery D235C cruise report d235.pdf (7.85 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
SpecificReykjanes Ridge
Track chartsRRS Discovery D235C cruise track — trk4337a.html RRS Discovery D235C cruise track — trk4337b.html
Physical oceanography 
BathythermographQuantity: number of profiles = 24
Description: XBT drops with TS probes - data sent to Hydrographic Office
Geology and geophysics 
Multichannel seismic reflectionQuantity: track kilometres = 1333
Description: Multi-channel (96) seismic lines - 15 sec firing rate - 12 gun array
Gravity measurementsQuantity: track kilometres = 1333
Description: Gravity data for entire cruise
Magnetic measurementsQuantity: track kilometres = 1333
Description: Magnetic data along seismic lines
Moorings, landers, buoys 
Geology and geophysics 
Other geological/geophysical measurements57° 24' 59" N  31° 36' 0" W — Deployed and recovered electromagnetic receiver