Accession Number : AD0842567
Title : United States Naval Oceanographic Office Marine Geophysical Survey Program, 1965-1967, North Atlantic Ocean, Norwegian Sea, and Mediterranean Sea, Area 2, Volume 5. Geology and Geophysics.
Descriptive Note : Final rept.
Corporate Author : TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV
Report Date : 08 MAR 1968
Pagination or Media Count : 120
Abstract : The physiographic provinces defined by Heezen et al (1959) and delineated over much of the North Atlantic are reasonably well-developed in the southern part of the area (47N-52 degrees N). At approximately 52 degrees N, the ocean floor is disrupted by Rockall rise, an aseismic feature which is 200 mi wide and 600 mi long and occupies approximately one-half of the area between the ridge crest and the continental margin. A segment of the mid-oceanic ridge lies west of Rockall. Topographic expressions of an E-W offset to the ridge are seen in the displacement of a linear trend of seamounts and a trough which appears to be of fault origin. Distribution of sediments in Area 2 is controlled by topographic expressions of the continental margin, Rockall rise, and Mid-Atlantic ridge. The provinces adjoining the continent are characterized by thick sequences of coarse terrigenous sediments. The region surrounding Rockall rise and plateau receive slump-derived material in addition to pelagic sedimentation. The Mid-Atlantic ridge contains marked degrees of sediment accumulation. The sharp peaks are sparsely mantled due to sediment instability. Sediments from these peaks, along with normal pelagic processes, produce the flat-floored basins characteristic of the ridge. (Author)
Descriptors : (*ATLANTIC OCEAN, MARINE GEOPHYSICS), (*MEDITERRANEAN SEA, MARINE GEOPHYSICS), ECHO RANGING, REFLECTION, SEDIMENTATION, OCEAN BOTTOM TOPOGRAPHY, BATHYTHERMOGRAPH DATA, OCEANOGRAPHIC SHIPS, NAVIGATION CHARTS, DISTRIBUTION, MAPS, THICKNESS, CONTINENTAL SHELVES, NORWEGIAN SEA, HYDROGRAPHIC SURVEYING, ROCK.
Subject Categories : Physical and Dynamic Oceanography
Distribution Statement : APPROVED FOR PUBLIC RELEASE