Open AccessPreliminary Results of Investigations Into Seabed Stability in the Hibernia Region of the Grand Banks During Operations of HMCS Cormorant and SDL-1 Submersible
Author(s) -
J. Vaughn Barrie,
W.T. Collins
Publication year - 1986
Language(s) - English
Resource type - Reports
DOI - 10.4095/130151
Subject(s) - geology , canyon , bathymetry , bedform , facies , oceanography , seabed , sonar , ridge , sedimentary rock , sediment , sound (geography) , geomorphology , sediment transport , paleontology , structural basin
In October, 1984 an 18 day scientific cruise was completed to the Hibernia area of the Grand Banks of ·Newfoundland on the HMCS CORMORANT and the SDL-1 manned submersible in cooperation with the Canadian Forces 'and the Geological Survey of Canada. Thesurficial sediment facies reported by Barrie et al. (1984) were examined and detailed observations were made of the smaller sedimentary bedforms. A deep, 10 m pit was found using sidescan sonar and 3.5 kHz profiles and subsequently examined by submersible. The feature, similar to others in the area,was formed during the impact of an iceberg followed possibly by a bearing capacity failure. An experiment site using Europiumdoped tracer sand and sediment transport rods was established on the western flank of a sand ridge. Finally a regional sidescan sonar and sub-bottom profiler survey wascarried out south to Carson Canyon, extending the distribution of the established sediment facies.