Cruise inventory

RRS Charles Darwin CD76

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD76
Cruise period1993-02-04 — 1993-03-11
StatusCompleted
Port of departurePort of Spain, Trinidad and Tobago
Port of returnPonta Delgada, Portugal
PurposeResearch
ObjectivesTo assess the extent of high-temperature hydrothermal activity along 300km of the Kane to Atlantis Supersegment of the Mid-Atlantic Ridge.
To assess the extent of chemical and physical effects of plume activity in the water column above the ridge crest, while imaging the tectonic and volcanic character of the axial valley.
To carry out geological sampling in the vicinity of the vent site by dredging.
Chief scientistBramley J Murton (Institute of Oceanographic Sciences Deacon Laboratory)
ProjectBRIDGE
Coordinating bodyNERC
Cruise reportRRS Charles Darwin CD76 cruise report cd76.pdf — access key 'C' (3.60 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificMid north Atlantic, 27N-30N, along axis of mid-Atlantic ridge
Track chartsRRS Charles Darwin CD76 cruise track — trk3828.html
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 14
Description: ZAPS sledge package, from surface to ~10m from bottom
Subsurface temperature and salinity measurementsQuantity: activity duration in days = 10
Description: continuous underway temperature temperature and transmittance
Transparency (eg transmissometer)Quantity: activity duration in days = 10
Description: continuous underway temperature temperature and transmittance
Transparency (eg transmissometer)Quantity: number of profiles = 14
Description: ZAPS sledge package, surface to ~10m from bottom
Chemical oceanography 
Other chemical oceanographic measurementsQuantity: number of profiles = 14
Description: ZAPS sledge package from surface to ~10m from bottom
Other chemical oceanographic measurementsQuantity: activity duration in days = 10
Description: ZAPS (Mn sensor)
Geology and geophysics 
DredgeQuantity: number of deployments = 10
Description: Standard dredges
Bottom photographyQuantity: number of deployments = 5
Description: ~10m near bottom photography, monochrome, still, 35mm
Long/short range side scan sonarQuantity: activity duration in days = 10
Description: double sided side-scan sonar,30kHz,6km wide swath,200-400m above seabed
Single channel seismic reflectionQuantity: activity duration in days = 10
Description: 7kHz vertical seismic profiler
Magnetic measurementsQuantity: activity duration in days = 10
Description: magnetometer (3 axes)