Cruise inventory

RRS Discovery D187

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD187
Cruise period1989-10-20 — 1989-11-20
StatusCompleted
Port of departureLisbon, Portugal
Port of returnBarry, United Kingdom
PurposeResearch
Objectives1. To determine the sedimentary make-up of the Tagus, Horseshoe and Seine Abyssal Plains. To distinguish transported from pelagic sediments and to map as far as possible each lithological unit and determine flow characteristics for the transported units.
2. To identify the sources of the transported sediments in each abyssal plain and to distinguish between locally derived from the surrounding hills and distally derived from the Portuguese and African margins.
3. To determine the timing of turbidite emplacement on each plain and compare this to that determined on other plains.
4. To calculate rates of accumulation and compare this to the thickness of the turbidite sequences as determine from seismic records to estimate the age of the abyssal plains.
5. To investigate the diagenesis and metal relocations in the upper sediments of the plains.
Chief scientistPhilip P E Weaver (Institute of Oceanographic Sciences Deacon Laboratory)
Cruise reportRRS Discovery D187 cruise report d187.pdf — access key 'C' (0.81 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificWest and S West of Portugal (Tagus, Horseshoe and Seine Abyssal Plains)
Track chartsRRS Discovery D187 cruise track — d187track.pdf (00 MB) 
Measurements 
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 33
Description: +200 chemical & physical analysis; paleontology
Single-beam echosoundingQuantity: track kilometres = 2000
Description: bathymetry-narrow beam
Single channel seismic reflectionQuantity: track kilometres = 400