Cruise inventory

RRS Charles Darwin CD28

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD28
Cruise period1987-09-27 — 1987-11-01
Port of departureMuscat, Oman
Port of returnPort Louis, Mauritius
Objectives1. To collect multichannel seismic, single channel seismic and sediment velocity data in the vicinity of Ocean Drilling Programme (ODP) Leg 116 sites. These were to contribute to an understanding of the structural setting of the drill sites and will be worked up for publication in the Leg 116 Proceedings Volume.
2. To study the three-dimensional form of the sediment and basement deformation in the area of folding and faulting around 5S, 80E. Single and multichannel profiling and disposable sonobuoy data were to be collected. Gravity and magnetic data were also to be acquired to contribute to an understanding of crustal thickness and tectonic setting. A structural analysis will follow from this.
3. To sample basement and sediments on Afanasy Nikitin Seamount and collect enough magnetic, gravity and seismic profile data to allow an integrated geological - geophysical study of the seamount. It is hoped to date the formation of the seamount, which may have provided a critical load on the lithosphere to promote deformation.
Chief scientistRoger A Scrutton (University of Edinburgh Department of Geology)
Cruise reportRRS Charles Darwin CD28 cruise report cd28.pdf — access key 'C' (0.55 MB) 
Ocean/sea areas 
GeneralIndian Ocean
SpecificCentral Indian Ocean
Track chartsRRS Charles Darwin CD28 cruise track — cd28track.pdf (0.10 MB) 
Geology and geophysics 
DredgeQuantity: number of deployments = 4
Core - soft bottomQuantity: number of deployments = 2
Single-beam echosoundingQuantity: track kilometres = 2220
Description: incl. 1667nm 3.5kHz sediment profiler
Single channel seismic reflectionQuantity: track kilometres = 1897
Description: incl. 711nm multichannel seismic profiling
Gravity measurementsQuantity: track kilometres = 2220
Magnetic measurementsQuantity: track kilometres = 2220
Other geological/geophysical measurementsQuantity: number of stations = 10
Description: sonobuoy stations