RRS Discovery D154_2

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD154_2
Cruise period1985-01-01 — 1985-02-01
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnPunta Arenas, Chile
ObjectivesThe two main aims of the cruise were to study ridge crest-trench collisions in the Scotia and Bellingshausen seas and to investigate he controls on Weddell sea sedimentation. The cruise included a study of the three youngest collision zones off the Antarctic Peninsula and a reconnaissance of the youngest collision zone in the contrasting intra-oceanic environment directly south off the South Sandwich arc.
The cruise included the following activities:
(1) Geophysical (gravity, magnetics and seismics) surveying in the Bransfield Strait to South Orkney region, including shooting lines in conjunction with HMS Endurance.
(2) Measurement of sea-floor heatflow by deployment of in-situ probe, including piston-coring to determine site suitability.
(3) Sample collection by rock dredge.
(4) Routine XBT drops for IOS.
Chief scientistPeter F Barker (University of Birmingham Department of Geological Sciences)
Cruise reportRRS Discovery D154_2 cruise report d154.pdf (3.42 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
SpecificBransfield Strait, Scotia Sea
Track chartsRRS Discovery D154_2 cruise track — trk3055.html
Physical oceanography 
BathythermographQuantity: number of profiles = 160
Description: Gibralta-P. Stanley, S. Ocean, to Montevideo:2 or 4 per day
Routine standard measurements
Geology and geophysics 
DredgeQuantity: number of deployments = 19
Core - soft bottomQuantity: number of cores = 28
Multi-beam echosoundingQuantity: track kilometres = 21483
Description: +1000nm in Eq. Atlantic on passage
Long/short range side scan sonarQuantity: track kilometres = 5556
Single channel seismic reflectionQuantity: track kilometres = 3704
Gravity measurementsQuantity: track kilometres = 21483
Description: +1000nm in Eq. Atlantic on passage
Magnetic measurementsQuantity: track kilometres = 18520
Description: +1000nm in Eq. Atlantic on passage
Other geological/geophysical measurementsQuantity: 71
Description: heat flow