Cruise inventory

RRS Shackleton S3/76, Leg 2

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Shackleton (74SF)
Cruise identifierS3/76, Leg 2
Cruise period1976-06-18 — 1976-07-11
Port of departurePonta Delgada, Portugal
Port of returnBarry, United Kingdom
ObjectivesThe objectives of I.O.S. (W) were two fold. Firstly, to shoot three long refraction profiles west of the Mid- Atlantic Ridge north of the Azores, and secondly to carry out the gravity survey of the Kurchatov Fracture Zone (fig. 2) The refraction lines were intended to complement earlier work carried out in 1974 and 1975, which had as its aim the detection of structures within the upper mantle and the lateral variation of such structures normal to the ridge axis. The gravity survey was aimed at detecting the contrast of lithospheric thickness across the fracture zone and the degree of isostatic compensation adjacent to the fracture zone.
Chief scientistDrummond Hoyle Matthews (University of Cambridge Department of Earth Sciences), Robert B Whitmarsh (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Shackleton S3/76, Leg 2 cruise report shackleton3_76.pdf — access key 'C' (0.51 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Shackleton S3/76, Leg 2 cruise track — trk2077.html
Geology and geophysics 
Single-beam echosoundingQuantity: track kilometres = 2532
Description: precision echo-sounder
Single channel seismic reflectionQuantity: 387
Seismic refractionQuantity: 374
Gravity measurementsQuantity: track kilometres = 1085.272