Crustal subsidence rate off Hawaii determined from 234U/238U ages of drowned coral reefs
K.R. Ludwig, Barney J. Szabo, J.G. Moore, K. R. Simmons
1991, Geology (19) 171-174
A series of submerged coral reefs off northwestern Hawaii was formed during (largely glacial) intervals when the rate of local sea-level rise was less than the maximum upward growth rate of the reefs. Mass-spectrometric 234U/238U ages for samples from six such reefs range from 17 to 475 ka and indicate that...
Geologic controls on the formation and evolution of quaternary coastal deposits of the northern Gulf of Mexico
S.J. Williams, S. Penland, A. H. Sallenger Jr., R.A. McBride, J.L. Kindlinger
1991, Conference Paper, Coastal sediments '91
A study of the barrier islands and wetlands in the deltaic plain of Louisiana is presented. Its purpose was to document rapid changes and to learn more about the processes responsible and the geologic framework within which they operate. It included systematic collection and analysis of precision nearshore hydrographic data,...
On plate tectonics and the geologic evolution of southwestern North America
P.L. Ward
1991, Journal of Geophysical Research (96) 12479-12496
Very rapid subduction of the Farallon plate under southwestern North America between 60 and 40 Ma was accompanied by a relatively low volume of magmatism throughout the southwestern United States and northern Mexico. Between 40 and 20 Ma, when subduction slowed significantly and in one...
Identification of dissolved-constituent sources in mine-site ground water using batch mixing
Gregory M. Clark, Robert S. Williams Jr.
1991, Water Resources Bulletin (27) 93-100
Batch-mixing experiments were used to help identify lithologic and mineralogic sources of increased concentrations of dissolved solids in water affected by surface coal mining in northwestern Colorado. Ten overburden core samples were analyzed for mineral composition and mixed with distilled water for 90 days until mineral-water equilibrium was reached. Between...
Evaluation of geographic information systems for three-dimensional ground-water modeling, Yucca Mountain, Nevada
A. Keith Turner, Elisabeth M. Ervin, Joe S. Downey
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Fully three-dimensional representations of the geologic system at Yucca Mountain have been developed using a Geoscientific Information System, which is an expansion of a traditional Geographic Information Systems. These advanced, three dimensional, representations of Yucca Mountain are required to adequately evaluate the complex geologic and hydrologic conditions surrounding the site....
Real-time Seismic Amplitude Measurement (RSAM): a volcano monitoring and prediction tool
E.T. Endo, T. Murray
1991, Bulletin of Volcanology (53) 533-545
Seismicity is one of the most commonly monitored phenomena used to determine the state of a volcano and for the prediction of volcanic eruptions. Although several real-time earthquake-detection and data acquisition systems exist, few continuously measure seismic amplitude in circumstances where individual events are difficult to recognize or where volcanic...
A refinement of the combination equations for evaporation
P. C. D. Milly
1991, Surveys in Geophysics (12) 145-154
Most combination equations for evaporation rely on a linear expansion of the saturation vapor-pressure curve around the air temperature. Because the temperature at the surface may differ from this temperature by several degrees, and because the saturation vapor-pressure curve is nonlinear, this approximation leads to a certain degree of error...
Ground-water recharge from streamflow data, NW Florida
John Vecchioli, W. C. Bridges, Roger P. Rumenik, J. W. Grubbs
1991, Conference Paper
Annual base flows of streams draining Okaloosa County and adjacent areas in northwest Florida were determined through hydrograph separation and correlation techniques for purposes of evaluating variations in ground-water recharge rates. Base flows were least in the northern part of the county and greatest in the southern part. Topographic and...
An AEM-TEM study of weathering and diagenesis, Abert Lake, Oregon: II. Diagenetic modification of the sedimentary assemblage
J.F. Banfield, B.F. Jones, D.R. Veblen
1991, Geochimica et Cosmochimica Acta (55) 2795-2810
This paper compares the mineralogy and chemistry of clay minerals in sediments from various depths and positions in Abert Lake and surrounding playa with those of the weathered materials entering the lake in order to reveal the nature and extent of post-depositional mineralogical modification.Analytical electron microscope (AEM) data from individual...
Climatic significance of the ostracode fauna from the Pliocene Kap Kobenhavn Formation, north Greenland
E. M. Brouwers, N.O. Jorgensen, T. M. Cronin
1991, Micropaleontology (37) 245-267
The Kap Kobenhavn Formation crops out in Greenland at 80??N latitude and marks the most northerly onshore Pliocene locality known. The sands and silts that comprise the formation were deposited in marginal marine and shallow marine environments. An abundant and diverse vertebrate and invertebrate fauna and plant megafossil flora provide...
Characteristics of low-slope streams that affect O2 transfer rates
Gene W. Parker, Leslie A. DeSimone
1991, Conference Paper, Air-Water Mass Transfer
Multiple-regression techniques were used to derive the reaeration coefficients estimating equation for low sloped streams: K2 = 3.83 MBAS-0.41 SL0.20 H-0.76, where K2 is the reaeration coefficient in base e units per day; MBAS is the methylene blue active substances concentration in milligrams per liter; SL is the water-surface slope...
An overview of current programs on drug development and regulation for aquaculture: U.S. Fish and Wildlife Service perspective
R. A. Schnick
1991, Veterinary and Human Toxicology (33 Suppl. 1) 4-5
Abstract has not been submitted...
Vertical structure of cross-shore currents from wind-induced setup
Guy Gelfenbaum
1991, Conference Paper, Coastal Sediments '91
Most of the storm surge models presented in the literature are vertically averaged and calculate only the sea-surface elevation and mean flow. Whereas these models may be adequate for predicting storm surge heights for flooding purposes, they neglect the vertical structure of the flow and the boundary shear stress, which...
Development of water level regulation strategy for fish and wildlife, upper Mississippi River system
Kenneth S. Lubinski, G. Carmody, D. Wilcox, B. Drazkowski
1991, Regulated Rivers: Research & Management (6) 117-124
Water level regulation has been proposed as a tool for maintaining or enhancing fish and wildlife resources in navigation pools and associated flood plains of the Upper Mississippi River System. Research related to the development of water level management plans is being conducted under the Long Term Resource Monitoring Program....
Buried bedrock topography, evidence of overdeepening of Winimusset Brook bedrock valley, and reinterpretation of the extent of glacial Lake Winimusset, Ware quadrangle, Massachusetts
W.W. Lapham, A. Maevsky
1991, Northeastern Geology (13) 69-73
Results from 15 test borings and 8 seismic-refraction surveys in the northeastern quarter of the Ware quadrangle, Massachusetts, provide information on the buried-bedrock topography, evidence of overdeepening of Winimusset Brook valley, information on the thickness and lithology of lacustrine deposits in glacial Lake Winimusset, and indicate a need for reinterpretation...
40Ar/39Ar laser fusion and K-Ar ages from Lathrop Wells, Nevada, and Cima, California. The age of the latest volcanic activity in the Yucca Mountain area
Brent D. Turrin, Duane E. Champion
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
K-Ar and 40Ar/39Ar ages from the Lathrop Wells volcanic center, Nevada, and from the Cima volcanic field, California, indicate that the recently reported 20-ka age estimate for the Lathrop Wells volcanic center is incorrect. Instead an age of 119??11 to 141??10 ka is indicated for the Lathrop Wells volcanic center....
Mass sediment failure and transport features revealed by acoustic techniques, Beringian Margin, Bering Sea, Alaska
P.R. Carlson, Herman A. Karl, B. D. Edwards
1991, Marine Geotechnology (10) 33-51
Some of the largest single slide masses, including huge blocks tens of kilometers wide, occur on the rise of the central margin. Sliding of these blocks may have initiated the incision of some of the world's largest submarine canyons. One mass failure, particularly well defined by GLORIA, is 55 km...
Herbicides in surface waters of the midwestern United States: The effect of spring flush
E.M. Thurman, D. A. Goolsby, M. T. Meyer, D.W. Kolpin
1991, Environmental Science & Technology (25) 1794-1796
Approximately three-fourths of all preemergent herbicides used in the United States are applied to row crops over a 12-state area, called the "corn belt" (I). The application of these compounds may cause widespread degradation of water quality (2). Because herbicides are water soluble, there is the potential for leaching into...
Zoned garnets in metapelites in western Fiordland, southwest New Zealand: polychronic crystallisation and insight into the nature and extent of early Cretaceous regional metamorphism
J.Y. Bradshaw
1991, New Zealand Journal of Geology and Geophysics (34) 261-270
Two distinct types of compositional zoning are recognised in idioblastic to subidioblastic garnets in amphibolite facies metapelites in western Fiordland. One type occurs in kyanite (?? sillimanite)-bearing rocks and is characterised by a core to rim increase in CaO content, and a sympathetic decrease in FeO and MgO, with MnO...
Channel hydraulics and energy expenditure in channel adjustment; Elk Rock Reach, North Fork Toutle River, Washington
Andrew Simon
1991, Conference Paper
No abstract available....
Monitoring grasshopper and locust habitats in Sahelian Africa using GIS and remote sensing technology
G. Gray Tappan, Donald G. Moore, Walter I. Knauseberger
1991, International Journal of Geographical Information Systems (5) 123-135
Development programmes in Sahelian Africa are beginning to use geographic information system (GIS) technology. One of the GIS and remote sensing programmes introduced to the region in the late 1980s was the use of seasonal vegetation maps made from satellite data to support grasshopper and locust control. Following serious outbreaks...
Chemometric comparison of polychlorinated biphenyl residues and toxicologically active polychlorinated biphenyl congeners in the eggs of Forster's Terns (Sterna fosteri)
Ted R. Schwartz, David L. Stalling
1991, Archives of Environmental Contamination and Toxicology (20) 183-199
The separation and characterization of complex mixtures of polychlorinated biphenyls (PCBs) is approached from the perspective of a problem in chemometrics. A technique for quantitative determination of PCB congeners is described as well as an enrichment technique designed to isolate only those congener residues which induce mixed aryl hydrocarbon...
Extent, causes and timing of moose calves mortality in western interior Alaska
Timothy O. Osbourne, Thomas F. Paragi, James L. Bodkin, Andre J. Loranger, W. N. Johnson
1991, Alces (27) 24-30
We examined the causes and timing of moose (Alces alces) calf mortality during 1988 90 in 2 locations in western interior Alaska. Annual survival rates of all calves in 1988 (0.34, n = 42) and 1989 (0.29, n=47) on the Nowitna National Wildlife Refuge (NWR) and in 1990 (0.25, n...
Geohydrology and water quality in northern Portage County, Ohio, in relation to deep-well brine injection
S. M. Eberts
1991, Water-Resources Investigations Report 90-4158
Geohydrology and water quality of the principal freshwater aquifers near oilfield and gasfield brine-injection wells in northern Portage County, Ohio, were evaluated. Since 1975, 13 wells in this part of the Country have been used to dispose of more than 4.5 million barrels of brine by injection into Silurian carbonate...
MS-222 used to separate phase I striped bass with uninflated swim bladders
A. Henderson-Arzapalo, J. Hawkinson, P. Keyes
1991, Research Information Bulletin 8
No abstract available at this time...
