RRS Charles Darwin CD28
Cruise summary report
|Ship name (ship code)||RRS Charles Darwin (74AB)|
|Cruise period||1987-09-27 — 1987-11-01|
|Port of departure||Muscat, Oman|
|Port of return||Port Louis, Mauritius|
|Objectives||1. 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 scientist||Roger A Scrutton (University of Edinburgh Department of Geology)|
|Cruise report||(0.55 MB)|
|Specific||Central Indian Ocean|
|Track charts||(0.10 MB)|
|Geology and geophysics|
|Dredge||Quantity: number of deployments = 4|
|Core - soft bottom||Quantity: number of deployments = 2|
|Single-beam echosounding||Quantity: track kilometres = 2220|
Description: incl. 1667nm 3.5kHz sediment profiler
|Single channel seismic reflection||Quantity: track kilometres = 1897|
Description: incl. 711nm multichannel seismic profiling
|Gravity measurements||Quantity: track kilometres = 2220|
|Magnetic measurements||Quantity: track kilometres = 2220|
|Other geological/geophysical measurements||Quantity: number of stations = 10|
Description: sonobuoy stations