Erratum: Geochronology and petrogenesis of MORB from the Juan de Fuca and Gorda ridges by 238U-230Th disequilibrium
S.J. Goldstein, Michael T. Murrell, D.R. Janecky, John R. Delaney, David A. Clague
1992, Earth and Planetary Science Letters (109) 255-272
A highly precise mass spectrometric method of analysis was used to determine238U234U230Th232Th in axial and off-axis basalt glasses from Juan de Fuca (JDF) and Gorda ridges. Initial 230Th activity excesses...
Gravity-driven groundwater flow and slope failure potential: 1. Elastic effective-stress model
Richard M. Iverson, Mark E. Reid
1992, Water Resources Research (28) 925-938
Hilly or mountainous topography influences gravity-driven groundwater flow and the consequent distribution of effective stress in shallow subsurface environments. Effective stress, in turn, influences the potential for slope failure. To evaluate these influences, we formulate a two-dimensional, steady state, poroelastic model. The governing equations incorporate groundwater effects as body forces,...
Flow resistance under conditions of intense gravel transport
John Pitlick
1992, Water Resources Research (28) 891-903
A study of flow resistance was undertaken in a channelized reach of the North Fork Toutle River, downstream of Mount St. Helens, Washington. Hydraulic and sediment transport data were collected in flows with velocities up to 3 m/s and shear stresses up to 7 times the critical value needed for...
Comparison of downhole and surface sampling for the determination of volatile organic compounds (VOCs) in ground water
M. E. Rosen, James F. Pankow, Jacob Gibs, Thomas E. Imbrigiotta
1992, Ground Water Monitoring Review (12) 126-133
The relative precision and accuracy of sampling and analysis methods for the determination of trace concentrations of volatile organic compounds (VOCs) in ground water were compared. Samples were collected from a well containing nanogram‐per‐liter (ng/L) to microgram‐per‐liter (μg/L) levels of VOCs. A Keck helical rotor submersible pump was used to...
Quarterly Wildlife Mortality Report April 1992- June1992
G. Kidd
1992, Supplement to the Journal of Wildlife Diseases (28)
No abstract available....
Rhenium-osmium isotope constraints on the age of iron meteorites
M.F. Horan, J. W. Morgan, R.J. Walker, J. N. Grossman
1992, Science (255) 1118-1121
Rhenium and osmium concentrations and the osmium isotopic compositions of iron meteorites were determined by negative thermal ionization mass spectrometry. Data for the IIA iron meteorites define an isochron with an uncertainty of approximately ±31 million years for meteorites ∼4500 million years old. Although an absolute rheniumosmium closure age for...
Bacterial kidney disease in wild and hatchery spring and summer Chinook salmon juveniles in the Snake River Basin
R.J. Pascho
1992, Conference Paper, Proceedings of the Chinook smolt survival workshop
No abstract available ...
Thin, low‐velocity crust beneath the southern Yukon‐Tanana Terrane, east central Alaska: Results from Trans‐Alaska crustal transect refraction/wide‐angle reflection data
Bruce C. Beaudoin, Gary S. Fuis, Walter D. Mooney, Warren J. Nokleberg, Nikolas I. Christensen
1992, Journal of Geophysical Research B: Solid Earth (97) 1921-1942
A seismic refraction/wide‐angle reflection survey for the Trans‐Alaska Crustal Transect program reveals a thin, reflective crust beneath the southern Yukon‐Tanana terrane (YTT) in east central Alaska. These data are the first detailed refraction survey of the southern YTT and compose a 130‐km‐long reversed profile along the Alaska...
Antiferromagnetism in pressure-amorphized Fe2SiO4
M.B. Kruger, Raymond Jeanloz, M.P. Pasternak, R. D. Taylor, B.S. Snyder, A.M. Stacy, S.R. Bohlen
1992, Science (255) 703-705
Amorphous Fe2SiO4 synthesized at elevated pressures exhibits a Néel transition at a temperature identical to that observed in the crystalline form, TN = 65 (±2) kelvin at zero pressure. This behavior contrasts sharply with observations on other disordered systems, such as spin glasses, which characteristically exhibit strong "frustration" of the spins and consequent...
Estimating transition probabilities for stage-based population projection matrices using capture-recapture data
James D. Nichols, John R. Sauer, Kenneth H. Pollock, Jay B. Hestbeck
1992, Ecology (73) 306-312
In stage—based demography, animals are often categorized into size (or mass) classes, and size—based probabilities of surviving and changing mass classes must be estimated before demographic analyses can be conducted. In this paper, we develop two procedures for the estimation of mass transition probabilities from capture—recapture data. The first approach...
Visualizing the United States in computer chiaroscuro
Richard J. Pike, Gail Thelin
1992, Annals of the Association of American Geographers (82) 300-302
No abstract available....
40Ar/39Ar dating of vein amphibole from the Bayan Obo iron-rare earth element-niobium deposit, Inner Mongolia, China; constraints on mineralization and deposition of the Bayan Obo Group
James E. Conrad, Edwin H. McKee
1992, Economic Geology (87) 185-188
No abstract available....
Petrology of the Caribou Mountain Pluton, Klamath Mountains, California
Calvin G. Barnes, Melanie Barnes, Ronald W. Kistler
1992, Journal of Petrology (33) 95-124
The Caribou Mountain pluton is a small trondhjemitic body that intruded semipelitic schist of the Stuart Fork terrane in late Middle Jurassic to Early Cretaceous time. Its emplacement followed the intrusion of an adjoining body of hornblende quartz diorite called the Middle Fork pluton and the mode of its...
A new Cretaceous-Tertiary boundary locality in the western Powder River basin, Wyoming: Biological and geological implications
D. J. Nichols, J. L. Brown, M. Attrep Jr., C. J. Orth
1992, Cretaceous Research (13) 3-30
A newly discovered Cretaceous-Tertiary (K-T) boundary locality in the western Powder River basin, Wyoming, is characterized by a palynologically defined extinction horizon, a fern-spore abundance anomaly, a strong iridium anomaly, and shock-metamorphosed quartz grains. Detailed microstratigraphic analyses show that about one third of the palynoflora (mostly angiosperm pollen) disappeared abruptly,...
Fyke-net and gill-net size selectivities for yellow perch in Green Bay, Lake Michigan
Clifford E. Kraft, Barry L. Johnson
1992, North American Journal of Fisheries Management (12) 230-236
We estimated a fyke‐net selectivity function for yellow perch Perca flavescens in Green Bay, Lake Michigan, by comparing length‐frequency distributions of yellow perch captured in fyke nets with different mesh sizes in 1986. Using a length—girth relationship for Green Bay yellow perch, we expressed selectivity as the ratio of girth (G) to...
Acoustic waveform logging: Advances in theory and application
F.L. Paillet, C.H. Cheng, W.D. Pennington
1992, Log Analyst (33) 239-258
Full-waveform acoustic logging has made significant advances in both theory and application in recent years, and these advances have greatly increased the capability of log analysts to measure the physical properties of formations. Advances in theory provide the analytical tools required to understand the properties of measured seismic waves, and...
Reply to comment on "The surface area of soil organic matter"
Cary T. Chiou, Jiunn Fwu Lee, Stephen A. Boyd
1992, Environmental Science & Technology (26) 404-406
No abstract available....
Response to comment on "Use of colloid filtration theory in modeling movement of bacteria through a contaminated sandy aquifer"
Ronald W. Harvey, Stephen P. Garabedian
1992, Environmental Science & Technology (26) 401-402
No abstract available....
Effect of stocking season and technique on survival of lake trout in Lake Ontario
Joseph H. Elrod, Clifford P. Schneider
1992, North American Journal of Fisheries Management (12) 131-138
To identify the stocking season and technique that resulted in maximum contribution of hatchery‐reared lake trout Salvelinus namaycush to the population in Lake Ontario, paired lots of yearlings were stocked near shore in March, near shore in May, and offshore by helicopter in May. All mortality associated with stocking season and technique...
Evaluating enhancement of striped bass in the context of potential predation on anadromous salmonids in Coos Bay, Oregon
J. H. Johnson, A.A. Nigro, R. Temple
1992, North American Journal of Fisheries Management (12) 103-108
We describe an approach for evaluating the predation on anadromous salmonids that could result from enhancement of striped bass Morone saxatilis in Coos Bay, Oregon. Predation by striped bass on juvenile salmonids has been documented there since 1930. To provide a basis for the decision about enhancement of striped bass in Coos...
Lunar impact basins and crustal heterogeneity: New western limb and far side data from Galileo
Michael J.S. Belton, James W. Head III, Carle M. Pieters, Ronald Greeley, Alfred S. McEwen, G. Neukum, Kenneth P. Klaasen, C.D. Anger, M. H. Carr, C. R. Chapman, M. E. Davies, F. P. Fanale, P.J. Gierasch, R. Greenberg, A. Ingersoll, Torrence Johnson, B. Paczkowski, C.B. Pilcher, J. Veverka
1992, Science (255) 570-576
Multispectral images of the lunar western limb and far side obtained from Galileo reveal the compositional nature of several prominent lunar features and provide new information on lunar evolution. The data reveal that the ejecta from the Orientale impact basin (900 kilometers in diameter) lying outside the Cordillera Mountains was...
Groundwater use: Equilibrium between social benefits and potential environmental costs
M.R. Llamas, W. Back, J. Margat
1992, Hydrogeology Journal (1) 3-14
In many countries groundwater resources are under-appreciated and, therefore, underutilizied; whereas, in some areas they are inappropriately exploited and, therefore, over-utilized. “Over utilization” can lead to depletion in quantity or a degradation in quality or both. Obstacles to effective management include: (1) lack of knowledge of basic principles of...
Morphology of the island of Hawaii
James G. Moore, Robert K. Mark
1992, GSA Today (2) 257-262
Digital elevation data for the island of Hawaii from the U.S. Geographical Survey gridded at 30 m spacing was used to generate a slope map, a shaded relief map, and plots that compare slope and elevation for each of the five volcanoes that compose the island.These computer- generated products are...
Allochthonous impact-shocked rocks and superimposed deformations at the Beaverhead site in southwest Montana
R.B. Hargraves, Karl S. Kellogg, P.S. Fiske, S.B. Hougen
1992, GSA Special Papers (293) 225-235
Upward-pointing shatter cones in sandstones of uncertain age (Middle Proterozoic? to Lower Cambrian?) and older crystalline basement rocks are exposed over an area of approximately 25 × 8 km in southwestern Montana. These shatter cones, together with pseudotachylites and breccias of various types (particularly in basement gneisses), are inferred to...
Late Holocene tectonics and paleoseismicity, southern Cascadia subduction zone
S. H. Clarke Jr., G. A. Carver
1992, Science (255) 188-192
Holocene deformation indicative of large subduction-zone earthquakes has occurred on two large thrust fault systems in the Humboldt Bay region of northern California. Displaced stratigraphic markers record three offsets of 5 to 7 meters each on the Little Salmon fault during the past 1700 years. Smaller and less frequent Holocene...
