Cruise inventory

RRS James Clark Ross JR19930331 (JR05)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19930331 (JR05)
Cruise period1993-03-31 — 1993-04-17
StatusCompleted
Port of departureMontevideo, Uruguay
Port of returnAscension Island, United Kingdom
PurposeResearch
ObjectivesTo carry out multichannel seismic reflection, sonobuoy refraction, gravity, magnetic and echosounder surveys of the mid-Atlantic Ridge in the vicinity of Ascension Island. These surveys would enable us to infer the detailed crustal and uppermost mantle structure of a hotspot-influenced slow-spreading ridge.
Chief scientistTim A Minshull (University of Cambridge Department of Earth Sciences)
ProjectSeismic Survey of the Mid-Atlantic Ridge near Ascension Island
Cruise reportRRS James Clark Ross JR19930331 (JR05) cruise report jr05_93.pdf — access key 'C' (0.78 MB) 
Ocean/sea areas 
GeneralSouth Atlantic Ocean
Track chartsRRS James Clark Ross JR19930331 (JR05) cruise track — jr05_93track.pdf (00 MB) 
Measurements 
Physical oceanography 
BathythermographDescription: XBT deployments took place at various points during the cruise No. of deployments not noted.
Subsurface temperature and salinity measurementsQuantity: number of samples = 2
Description: At the Vitoria-Trinidade seamount chain temperature and magnetometer samples were taken. No. of samples not noted.
Biology and fisheries 
Gear researchQuantity: number of deployments = 1
Description: An XBT deployment took place in a drum filled with seawater on deck as a trial.
Geology and geophysics 
Single-beam echosoundingDescription: A number of sonobouy deployments took place throughout the cruise. No. of deployments not noted.
Magnetic measurementsQuantity: number of deployments = 2
Description: 10kHz fish was deployed and the magnetometer was deployed on the contenental shelf.
Magnetic measurementsQuantity: number of samples = 2
Description: At the Vitoria-Trinidade seamount chain temperature and magnetometer samples were taken. No. of samples not noted.