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RRS Charles Darwin CD76
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Charles Darwin (74AB) |
Cruise identifier | CD76 |
Cruise period | 1993-02-04 — 1993-03-11 |
Status | Completed |
Port of departure | Port of Spain, Trinidad and Tobago |
Port of return | Ponta Delgada, Portugal |
Purpose | Research |
Objectives | To 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 scientist | Bramley J Murton (Institute of Oceanographic Sciences Deacon Laboratory) |
Project | BRIDGE |
Coordinating body | NERC |
Cruise report | (3.60 MB) |
Ocean/sea areas | |
General | North East Atlantic Ocean (limit 40W) |
Specific | Mid north Atlantic, 27N-30N, along axis of mid-Atlantic ridge |
Track charts | |
Measurements | |
Physical oceanography | |
CTD stations | Quantity: number of profiles = 14 Description: ZAPS sledge package, from surface to ~10m from bottom |
Subsurface temperature and salinity measurements | Quantity: 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 measurements | Quantity: number of profiles = 14 Description: ZAPS sledge package from surface to ~10m from bottom |
Other chemical oceanographic measurements | Quantity: activity duration in days = 10 Description: ZAPS (Mn sensor) |
Geology and geophysics | |
Dredge | Quantity: number of deployments = 10 Description: Standard dredges |
Bottom photography | Quantity: number of deployments = 5 Description: ~10m near bottom photography, monochrome, still, 35mm |
Long/short range side scan sonar | Quantity: activity duration in days = 10 Description: double sided side-scan sonar,30kHz,6km wide swath,200-400m above seabed |
Single channel seismic reflection | Quantity: activity duration in days = 10 Description: 7kHz vertical seismic profiler |
Magnetic measurements | Quantity: activity duration in days = 10 Description: magnetometer (3 axes) |