Accession Number : AD0857629

Title :   United States Naval Oceanographic Office Marine Geophysical Survey Program 1965-1967, North Atlantic Ocean, Norwegian Sea, and Mediterranean Sea, Area 7/4, Volume 5, Geology and Geophysics.

Descriptive Note : Final rept.

Corporate Author : TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV

Report Date : 16 APR 1969

Pagination or Media Count : 186

Abstract : Task Area 7/4 - bounded by latitudes 32 degrees N and 48 degrees N, the Mid-Atlantic ridge on the east, and longitude 57 degrees W - contains a bottom morphology characteristic of much of the Atlantic. South of the Grand Banks, abyssal-plain development is extensive; east of the Grand Banks, the deep-ocean basin has not been leveled to abyssal-plain gradients; there, the lower continental rise extends to the abyssal-hills province. The Mid-Atlantic ridge occupies the eastern half of the survey area, trending NE-SW to the Azores Islands, where it changes direction to north. There is a zone of weakness between the Grand Banks and the Azores; the Southeast Newfoundland ridge lies along this zone. The extension of this zone southeast from the ridge contains bathymetric and magnetic expressions which suggest a major fracture zone. Depth and topography control sediment distribution in Area 7/4; the nearshore basins receive large accumulations of terrigenous sediments, whereas the areas far removed from the continents receive primarily pelagic products. (Author)

Descriptors :   (*MARINE GEOPHYSICS, ATLANTIC OCEAN), (*OCEANOGRAPHIC DATA, NORWEGIAN SEA), (*OCEAN BOTTOM TOPOGRAPHY, MEDITERRANEAN SEA), HYDROGRAPHIC SURVEYING, SEISMIC WAVES, REFLECTION, OCEANOGRAPHIC SHIPS, SEDIMENTATION, BATHYTHERMOGRAPH DATA, NAVIGATION CHARTS, OCEAN BOTTOM SAMPLING.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE