Cruise inventory

RRS Charles Darwin CD23

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD23
Cruise period1987-05-13 — 1987-06-11
StatusCompleted
Port of departureVictoria, Seychelles
Port of returnPort Louis, Mauritius
PurposeResearch
ObjectivesThe cruise consisted of an underway geophysical survey of part of the Central Indian Ocean, specifically to study the structure and evolution of the ridge-ridge-ridge (RRR) triple junction marking the conjunction of the African, Indian and Antarctica lithospheric plates. The plates meet at a point close to 25 degrees 30 mins South 70 degrees east, and the survey was planned so as to cover a reconnaissance box approximately 200 km square centred on this point, in addition to a survey west and south from this area to follow one of the component spreading axes.
Additional surveys were conducted on transit from the Seychelles to the main area, covering the Central Indian Ridge (CIR) and its pattern of offsets and fracture zones, over the triple junction trace in the Indian plate, and finally from the main survey areas to Mauritius.
Chief scientistLindsay M Parson (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Charles Darwin CD23 cruise report cd23.pdf — access key 'C' (0.54 MB) 
Ocean/sea areas 
GeneralIndian Ocean
SpecificIndian Ocean/ Triple Junction
Track chartsRRS Charles Darwin CD23 cruise track — trk3327.html
Measurements 
Geology and geophysics 
In-situ seafloor measurement/samplingDescription: gravimetric properties of the sea floor
Single-beam echosoundingQuantity: track kilometres = 2200
Multi-beam echosoundingQuantity: track kilometres = 2200
Long/short range side scan sonarQuantity: track kilometres = 2000
Single channel seismic reflectionQuantity: track kilometres = 1000
Gravity measurementsQuantity: track kilometres = 4074.4
Magnetic measurementsQuantity: track kilometres = 4074.4