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Filter Total Items: 1417
Climate and ocean dynamics and the lead isotopic records in Pacific ferromanganese crusts Climate and ocean dynamics and the lead isotopic records in Pacific ferromanganese crusts
As hydrogenous iron-manganese crusts grow, at rates of millimeters per million years, they record changes in the lead isotopic composition of ambient seawater. Time-resolved lead isotopic data for cut slabs of two central Pacific iron-manganese crusts that have been growing since about 50 million years ago were measured in situ by laser ablation, multiple-collector, inductively coupled...
Authors
John N. Christensen, Alex N. Halliday, Linda V. Godfrey, James R. Hein, David K. Rea
Slope basins, headless canyons, and submarine palaeoseismology of the Cascadia accretionary complex Slope basins, headless canyons, and submarine palaeoseismology of the Cascadia accretionary complex
A combination of geomorphological, seismic reflection and geotechnical data constrains this study of sediment erosion and deposition at the toe of the Cascadia accretionary prism. We conducted a series of ALVIN dives in a region south of Astoria Canyon to examine the interrelationship of fluid flow and slope failure in a series of headless submarine canyons. Elevated head gradients at...
Authors
B. G. McAdoo, Daniel L. Orange, Elizabeth Screaton, H. Lee, Robert Kayen
Precambrian to modern manganese mineralization: Changes in ore type and depositional environment Precambrian to modern manganese mineralization: Changes in ore type and depositional environment
No abstract available.
Authors
Keith Nicholson, James R. Hein, Bernhard Buhn, Somnath Dasgupta
Continental-margin seismic stratigraphy: Assessing the preservation potential of heterogeneous geological processes operating on continental shelves and slopes Continental-margin seismic stratigraphy: Assessing the preservation potential of heterogeneous geological processes operating on continental shelves and slopes
No abstract available.
Authors
James A. Austin, Craig S. Fulthorpe, Gregory S. Mountain, Daniel L. Orange, Michael E. Field
Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA
No abstract available.
Authors
Mary McGann, Doris Sloan
Linking sediment transport and stratigraphy on the continental shelf Linking sediment transport and stratigraphy on the continental shelf
The goal of the shelf sediment dynamics component of STRATAFORM is to link sediment transport processes active on the continental shelf to the formation and preservation of event beds in shelf sediment deposits. An approach combining shelf sediment-transport models with high-resolution measurements of water-column and bed properties over periods from several months to several years...
Authors
P.L. Wiberg, D.A. Cacchione, Richard W. Sternberg, L. Donelson Wright
Organic geochemistry applied to environmental assessments of Prince William Sound, Alaska, after the Exxon Valdez oil spill—a review Organic geochemistry applied to environmental assessments of Prince William Sound, Alaska, after the Exxon Valdez oil spill—a review
Organic geochemistry played a major role in the environmental assessments conducted following the Exxon Valdez oil spill, which occurred on March 24, 1989, and released about 258,000 bbls (41 million liters) of Alaska North Slope crude oil into Prince William Sound. Geochemical analyses of more than 15,000 sediment, tar, and biological samples and about 5000 water samples provide the...
Authors
A.E. Bence, Keith A. Kvenvolden, M.C. Kennicutt
Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater
In order to evaluate details of the partitioning behaviours of Y, rare earth elements (REEs), and Ti between inorganic metal oxide surfaces and seawater, we studied the distribution of these elements in hydrogenetic marine ferromanganese (Fe-Mn) crusts from the Central Pacific Ocean. Nonphosphatized Fe-Mn crusts display shale-normalized rare earths and yttrium (REYSN) patterns (Y...
Authors
Michael Bau, Andrea Koschinsky, Peter Dulski, James R. Hein
Relationship between the present-day stress field and plate boundary forces in the Pacific Northwest Relationship between the present-day stress field and plate boundary forces in the Pacific Northwest
The relationship between plate boundary forces and the observed stress field in the Pacific Northwest is established using numerical models of continental deformation. Because the orientation of the greatest horizontal principal stress throughout the Pacific Northwest differs considerably from the direction of convergence between the Juan de Fuca and North American plates, the...
Authors
Eric L. Geist
Source parameters controlling the generation and propagation of potential local tsunamis along the cascadia margin Source parameters controlling the generation and propagation of potential local tsunamis along the cascadia margin
The largest uncertainty in assessing hazards from local tsunamis along the Cascadia margin is estimating the possible earthquake source parameters. We investigate which source parameters exert the largest influence on tsunami generation and determine how each parameter affects the amplitude of the local tsunami. The following source parameters were analyzed: (1) type of faulting...
Authors
Eric L. Geist, Shoichi Yoshioka
Final report: Acoustic mapping of dredged material disposal sites and deposits in Mamala Bay, Honolulu, Hawaii Final report: Acoustic mapping of dredged material disposal sites and deposits in Mamala Bay, Honolulu, Hawaii
No abstract available.
Authors
Michael E. Torresan, M. A. Hampton, M. H. Gowen, J. H. Barber, L. L. Zink, T. E. Chase, F. L. Wong, J. T. Gann, Peter Dartnell
The M2 tide on the Amazon Shelf The M2 tide on the Amazon Shelf
As part of A Multidisciplinary Amazon Shelf Sediment Study (AMASSEDS), moored and shipboard current measurements made over the Amazon shelf during 1990–1991 have been analyzed to determine the dominant semidiurnal tidal constituent, the M2. These results have been combined with coastal sea level data from within the Amazon and Para Rivers, the adjacent shelf, and with satellite‐derived...
Authors
R.C. Beardsley, J.L. Candela, R. Limeburner, W. Rockwell Geyer, Steven J. Lentz, Belmiro M. Castro, D.A. Cacchione, Nelson Carneiro