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Filter Total Items: 1423
Ferromanganese crusts Ferromanganese crusts
No abstract available.
Authors
Frank T. Manheim, James R. Hein
Internal-wave currents as a mechanism to account for large sand waves in Navarinsky Canyon head, Bering Sea Internal-wave currents as a mechanism to account for large sand waves in Navarinsky Canyon head, Bering Sea
Sand waves are found in the heads of four of five large submarine canyons that incise the northern continental margin of the Bering Sea. The sand waves occur in a restricted depth zone of about 175-490 m. Those in Navarinsky Canyon, the area surveyed in most detail, are best developed in water depths of 300-375 m; they average 5 m in height and about 650 m in wavelength, with crests...
Authors
H. A. Karl, D.A. Cacchione, P.R. Carlson
Isotopic composition of interstitial fluids in sediment of the Nankai Trough, Deep Sea Drilling Project Leg 87 Isotopic composition of interstitial fluids in sediment of the Nankai Trough, Deep Sea Drilling Project Leg 87
The isotopic compositions of dissolved CO2 and CH4 in sediments of the Nankai Trough indicate that CH4 is formed during early diagenesis by microbial reduction of CO2 . At the shallowest sampled depths, the CO2 dissolved in the pore water is unusually enriched in 12C (δ13C = - 35.2‰), indicating contribution of CO2 from oxidation of CH4 . The most intense microbiological activity appears...
Authors
George E. Claypool, A.K. Vuletich, Keith A. Kvenvolden
Comment and Reply on “Gas hydrates on the northern California continental margin”: REPLY Comment and Reply on “Gas hydrates on the northern California continental margin”: REPLY
No abstract available.
Authors
Michael E. Field, Keith A. Kvenvolden
Submarine fissure eruptions and hydrothermal vents on the southern Juan de Fuca Ridge: preliminary observations from the submersible Alvin Submarine fissure eruptions and hydrothermal vents on the southern Juan de Fuca Ridge: preliminary observations from the submersible Alvin
The submersible Alvin was used to investigate 3 active hydrothermal discharge sites along the S Juan de Fuca Ridge in September 1984. The hydrothermal zones occur within a 10-30m-deep, 30-50m-wide cleft marking the center of the axial valley. This cleft is the eruptive locus for the axial valley. The hydrothermal vents coincide with the main eruptive vents along the cleft. Each...
Authors
W. R. Normark
GLORIA II sonograph mosaic of the western U.S. Exclusive Economic Zone GLORIA II sonograph mosaic of the western U.S. Exclusive Economic Zone
In 1983 the United States declared sovereign rights and jurisdiction over living and nonliving resources in an area extending 200 nautical miles (370 km) seaward from its shores. In response to the establishment of this Exclusive Economic Zone (EEZ), the U.S. Geological Survey (USGS) has implemented a program, called EEZ‐Scan, to systematically map the EEZ, using the Geological Long‐...
Authors
D.A. Cacchione, D.E. Drake, B. Edwards, M. Field, J. Gardner, M. Hampton, H. Karl, David S. McCulloch, Neil H. Kenyon, D. Masson
Geochemistry of the gases in gas-hydrate-bearing sediments in the region of the Blake Outer Ridge, Atlantic Ocean Geochemistry of the gases in gas-hydrate-bearing sediments in the region of the Blake Outer Ridge, Atlantic Ocean
No abstract available.
Authors
E.M. Galimov, Keith A. Kvenvolden
Gas hydrates on the northern California continental margin Gas hydrates on the northern California continental margin
The inner continental margin of northern California is underlain by a well-defined and extensive acoustic reflector that crosses other reflectors and mimics the surface of the sea floor. This bottom-simulating reflector (BSR) lies at a typical subsurface depth of about 250 m and has been mapped continuously beneath the Klamath Plateau and upper slope (water depths of 800 to 1200 m) for a...
Authors
Michael E. Field, Keith A. Kvenvolden
Marine geological and geophysical investigations in the Ross Sea, Antarctica Marine geological and geophysical investigations in the Ross Sea, Antarctica
No abstract available.
Authors
Alan K. Cooper, F.J. Davey
An empirical equation of state for hydrothermal seawater (3.2 percent NaCl) An empirical equation of state for hydrothermal seawater (3.2 percent NaCl)
No abstract available.
Authors
James L. Bischoff, Robert J. Rosenbauer
Ferromanganese crusts from Necker Ridge, Horizon Guyot and S.P. Lee Guyot: Geological considerations Ferromanganese crusts from Necker Ridge, Horizon Guyot and S.P. Lee Guyot: Geological considerations
Necker Ridge, Horizon Guyot and S.P. Lee Guyot in the Central Pacific were sampled, seismically surveyed, and photographed by bottom cameras in order to better understand the distribution, origin, and evolution of ferromanganese crusts. Necker Ridge is over 600 km long with a rugged crest, pods of sediment to 146 m thick, slopes that average 12° to 20°, and debris aprons that cover some...
Authors
James R. Hein, Frank T. Manheim, William C. Schwab, Alice S. Davis
Seismic and geochemical evidence for shallow gas in sediment on Navarin continental margin, Bering Sea Seismic and geochemical evidence for shallow gas in sediment on Navarin continental margin, Bering Sea
Marine seismic studies coupled with geochemical investigations demonstrate that hydrocarbon gases are ubiquitous in the near-surface (
Authors
Paul R. Carlson, Margaret Golan-Bac, Herman A. Karl, Keith A. Kvenvolden