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Filter Total Items: 1454
Concentrations and carbon isotopic compositions of CH4 and CO2 in gas from sediments of the Blake Outer Ridge, Deep Sea Drilling Project Leg 76 Concentrations and carbon isotopic compositions of CH4 and CO2 in gas from sediments of the Blake Outer Ridge, Deep Sea Drilling Project Leg 76
The principal gaseous carbon-containing components identified in the first 400 m of sediment at Deep Sea Drilling Project Site 533, Leg 76, are methane (CH4 ) and carbon dioxide (CO2 ). Below a sub-bottom depth of about 25 m, sedi ment cores commonly contained pockets caused by the expansion of gas upon core recovery. The carbon isotopic com position (δ13C %0 relative to PDB standard) of...
Authors
E.M. Galimov, Keith A. Kvenvolden
Tectonic evolution of Gulf of Anadyr and formation of Anadyr and Navarin basins Tectonic evolution of Gulf of Anadyr and formation of Anadyr and Navarin basins
New seismic reflectionand refraction data reveal that Anadyr basin is separated from Navarin basin by Anadyr ridge, a southeast-northwest-trending bedrock high that is characterized by high-amplitude, short-wavelength magnetic anomalies. Anadyr ridge may be an offshore extension of the melange belt underlying the Koryak Range. Sonobuoy refraction data indicate that the velocity profile...
Authors
Michael S. Marlow, Alan K. Cooper, Jonathan R. Childs
Wandering terranes in southern Alaska: The Aleutia Microplate and implications for the Bering Sea Wandering terranes in southern Alaska: The Aleutia Microplate and implications for the Bering Sea
Paleomagnetic and geological data suggest that much of southern Alaska is a collage of tectonostratigraphic terranes which originated in Mesozoic time at paleolatitudes far south of their present position. The time of ‘docking’ of the terranes against cratonic Alaska is critical to defining their amalgamated size and extent during their northward motion as well as their role in the...
Authors
Michael S. Marlow, Alan K. Cooper
A summary of U.S. Geological Survey marine geologic studies on the inner shelf of the Chukchi Sea, Alaska, 1975 and 1981 A summary of U.S. Geological Survey marine geologic studies on the inner shelf of the Chukchi Sea, Alaska, 1975 and 1981
No abstract available.
Authors
Thomas E. Reiss, R. L. Phillips, R. E. Hunter, P. W. Barnes
Response: Uranium series ages of the Del Mar Man and Sunnyvale skeletons Response: Uranium series ages of the Del Mar Man and Sunnyvale skeletons
No abstract available.
Authors
James L. Bischoff, Robert J. Rosenbauer
Comment and Reply on ‘Geochemistry of amino acids in sediments from Clear Lake, California’: REPLY Comment and Reply on ‘Geochemistry of amino acids in sediments from Clear Lake, California’: REPLY
No abstract available.
Authors
D. Blunt, Keith A. Kvenvolden, John D. Sims
Amino acids in sediments from Leg 68, Site 502 Amino acids in sediments from Leg 68, Site 502
No abstract available.
Authors
Keith A. Kvenvolden, D. Blunt
Leg 84 of the Deep Sea Drilling Project Leg 84 of the Deep Sea Drilling Project
No abstract available.
Authors
J. Aubouin, Roland E. von Huene, M. Baltuck, Robert Arnott, J. Bourgois, M.V. Filewicz, Keith A. Kvenvolden, Barry Leinert, Tom McDonald, Kristin McDougall-Reid, Y. Ogawa, Elliot Taylor, Barbara Winsborough
Ancient plate boundaries in the Bering Sea region Ancient plate boundaries in the Bering Sea region
Plate tectonic models of the Bering Sea suggest that the abyssal Bering Sea Basin is underlain by oceanic crust, a supposition supported by refraction and magnetic data. The oceanic crust is thought to be a remnant of the Kula(?) plate that was isolated within what is now the Bering Sea when the proto-Aleutian arc began to form between the Alaska Peninsula and Kamchatka in late Mesozoic...
Authors
M. S. Marlow, Alan K. Cooper, David W. Scholl, H. McLean
Measurements of storm-generated bottom stresses on the continental shelf Measurements of storm-generated bottom stresses on the continental shelf
Large values of bottom friction velocity, u*, and roughness length, z0, determined from burst-averaged speed data taken on the continental shelf in outer Norton Sound, Alaska, with the GEOPROBE tripod during a storm in September 1977 are correlated with extremely large values of near-bottom concentration of total suspended particulate matter (TSM). Combined wind-driven and tidal currents...
Authors
D.A. Cacchione, D.E. Drake
Uranium-series and soil-geomorphic dating of the Calico archaeological site, California Uranium-series and soil-geomorphic dating of the Calico archaeological site, California
Lithic specimens identified as artifacts have been recovered from near the base of the Yermo fan deposits at Calico, California. The soil on the fan surface is a strongly developed relict paleosol. Comparison of this soil with dated paleosols elsewhere in the southwestern United States suggests that the surface is about 80,000 to 125,000 yr old. Clasts near the base of the deposit are...
Authors
James L. Bischoff, Roy J. Shlemon, T. L. Ku, R.D. Simpson, Robert J. Rosenbauer, Budinger
Petrographic and chemical characteristics of pyrite-marcasite mineralization in hole 465A, southern Hess Rise Petrographic and chemical characteristics of pyrite-marcasite mineralization in hole 465A, southern Hess Rise
Core recovered from Hess Rise contains concentrations of pyrite, marcasite, and barite in the lowermost meter of limestone (Unit II) and in the brecciated upper part of the underlying volcanic basement (Unit HI). Petrographic and chemical data indicate that the sulfide-barite assemblage in the limestone is mainly a product of low-temperature diagenetic processes. The iron-sulfide phases...
Authors
Randolph A. Koski, James R. Hein