Accession Number : AD0817824
Title : UNITED STATES NAVAL OCEANOGRAPHIC OFFICE MARINE GEOPHYSICAL SURVEY PROGRAM 1965-1967 NORTH ATLANTIC OCEAN, NORWEGIAN SEA AND MEDITERRANEAN SEA, AREA 1 - VOLUME 5. GEOLOGY AND GEOPHYSICS.
Descriptive Note : Final rept.
Corporate Author : TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV
Report Date : 01 JUN 1967
Pagination or Media Count : 104
Abstract : Analysis of 9,000 miles of continuously recorded underway data including bathymetry, seismic reflection profiling, total magnetic intensity and sediment cores in the Norwegian Sea has delineated sediment and structural trends. The dominate structural trends in Area 1 are NE-SW lineations associated with the continental margins and mid-oceanic ridge and the NW-SE Jan Mayen Fracture Zone. The Mid-Atlantic Ridge passes through Iceland and continues NNE through the western part of the Norwegian Sea. The ridge is offset some 250 miles by the Jan Mayen Fracture Zone, continuing NE from the offset through the Greenland Sea. The seismically active fracture zone lies NW-SE and includes western Mayen Ridge, Jan Mayen Island, and Jan Mayen Cross Rise. The fracture zone extends to the Norwegian continental margin. Tertiary flood basalts in eastern Greenland may represent a westward extension of the fracture zone. En echelon faulting is evident, especially at the junction of Eastern Jan Mayen Ridge and the fracture zone. Distribution of sediments in the Norwegian Sea is controlled by the topographic expressions of the continental margin and the mid-oceanic ridge system. The provinces adjoining the continent are characterized by thick sequences of sediments locally influenced by topographic gradients, i.e., the decrease in sediment thickness at the steep shelf break. Important accumulations of sediment also result from pelagic sedimentation and ice-rafting. (Author)
Descriptors : *NORWEGIAN SEA), (*MARINE GEOPHYSICS, ATLANTIC OCEAN, HYDROGRAPHIC SURVEYING, OCEAN BOTTOM TOPOGRAPHY, DEEP WATER, OCEANOGRAPHIC SHIPS, BATHYTHERMOGRAPH DATA, SEDIMENTATION, FAULTS(GEOLOGY), GEOMAGNETISM, REFLECTIVITY, SEISMIC WAVES, ICE ISLANDS, ECHO RANGING, STRUCTURAL GEOLOGY, ICELAND, ATLANTIC OCEAN ISLANDS, OCEANOGRAPHIC DATA.
Subject Categories : Physical and Dynamic Oceanography
Geology, Geochemistry and Mineralogy
Distribution Statement : APPROVED FOR PUBLIC RELEASE