The Cretaceous-Tertiary extinction: A lethal mechanism involving anhydrite target rocks
R. Brett
1992, Geochimica et Cosmochimica Acta (56) 3603-3606
The Chicxulub Crater, Yucatan, Mexico, is a leading contender as the site for the impact event that caused the Cretaceous-Tertiary (K-T) extinctions. A considerable thickness of anhydrite (CaSO4) forms part of the target rock. High temperatures resulting from impact would drive SO2 off from the anhydrite. Hundreds of billions of tonnes...
Comparison of cortical bone and serum concentrations of clindamycin achievable by direct local infusion and intravenous administration
S.C. Budsberg, J.M. Gallo, C. E. Starliper, E.B. Shotts, J. Brown
1992, Journal of Orthopaedic Research (9) 594-599
Tibial cortical bone and serum concentrations of clindamycin were compared using two drug delivery methods in dogs. An implantable drug pump, used to continuously infuse clindamycin directly into the cortical bone, was compared with clindamycin administered i.v. Dosage for the direct continuous infusion was 4 mg/kg/day, and 44 mg/kg/day for...
Patterns of organochlorine contamination in lake trout from Wisconsin waters of the Great Lakes
Michael A. Miller, Charles P. Madenjian, Robert G. Masnado
1992, Journal of Great Lakes Research (18) 742-754
To investigate spatial and temporal patterns of organochlorine contamination in lake trout from Wisconsin waters of the Great Lakes, we examined laboratory contaminant analysis data of muscle tissue samples from Lake Michigan (n = 317) and Lake Superior (n = 53)...
Nutritional value of dietary nucleic acids and purine bases to rainbow trout (Oncorhynchus mykiss)
G. L. Rumsey, Robert Winfree, Steven Gerard Hughes
1992, Aquaculture (108) 97-110
Rainbow trout were fed diets with graded levels (0.6%, 1.6%, 2.5%, and 4.1%) of a yeast nucleic acid extract corresponding to dietary Saccharomyces cerevisiae levels of 7.5%, 20%, 30% and 50% or diets supplemented isonitrogenously (0.8% N) with free purines (adenine, guanine, xanthine, and hypoxanthine) in two 12-week studies. Fish fed increasing...
Neutrophil, glass-adherent, nitroblue tetrazolium assay gives early indication of immunization effectiveness in rainbow trout
D. P. Anderson, T. Moritomo, R. de Grooth
1992, Veterinary Immunology and Immunopathology (30) 419-429
Sulfur, carbon, and oxygen isotope variations in submarine hydrothermal deposits of Guaymas Basin, Gulf of California, USA
J.M. Peter, Wayne C. Shanks III
1992, Geochimica et Cosmochimica Acta (56) 2025-2040
Sulfur, carbon, and oxygen isotope values were measured in sulfide, sulfate, and carbonate from hydrothermal chimney, spire, and mound samples in the southern trough of Guaymas Basin, Gulf of California, USA. δ34S values of sulfides range from −3.7 to 4.5%. and indicate that...
Experimental study of iron-chloride complexing in hydrothermal fluids
J.B. Fein, J.J. Hemley, W. M. d’Angelo, A. Komninou, D.A. Sverjensky
1992, Geochimica et Cosmochimica Acta (56) 3179-3190
Mineral assemblage solubilities were measured in cold-seal pressure vessels as a function of pressure, temperature, and potassium chloride concentration in order to determine the nature and thermodynamic properties of iron-chloride complexes under hydrothermal conditions. The assemblage pyritepyrrhotite-magnetite was used to buffer ƒS2">ƒS2 and <span...
Molecular and genetic characterization of cytochrome oxidase negative Aeromonas salmonicida isolated from coho salmon (Oncorhynchus kisutch)
J.D. Teska, R. C. Cipriano, W. B. Schill
1992, Journal of Wildlife Diseases (28) 515-520
Cytochrome oxidase variants of the bacterial fish pathogen, Aeromonas salmonicida, were characterized for genetic and molecular homology with cytochrome oxidase-positive isolates that typically induce furunculosis in salmonids. Protein and lipopolysaccharide moieties of the cytochrome oxidase-negative variants were similar to their typical counterparts, based on...
Highlights of the 13 March 1992 Erzincan (Turkey) earthquake
Mehmet Çelebi
1992, Conference Paper, NIST Special Publication
The March 13, 1992 Ms = 6.8 Erzincan earthquake in Turkey is highlighted here. The epicenter of this earthquake was located 7.7 km from the eastern end of the North Anatolian fault. The strong motions recorded in Erzincan had peak ground accelerations of approximately 0.5 g, accompanied by a pulse...
Sulfur isotopic disequilibrium and fluid-rock interaction during metamorphism of sulfidic black shales from the Waterville-Augusta area, Maine, USA
N.H.S. Oliver, T.C. Hoering, T.W. Johnson, D. Rumble III, Wayne C. Shanks III
1992, Geochimica et Cosmochimica Acta (56) 4257-4265
Sulfur isotope ratios of pyrite (py) and pyrrhotite (po) from regionally metamorphosed graphitic sulfidic schists and related rocks from south-central Maine, USA, were analysed using SO2 and SF6 techniques. There is a broad range in δ34S values for both pyrite and pyrrhotite at most outcrops, up to 8%. and overall the values...
Ground water chemistry and geochemical modeling of water-rock interactions at the Osamu Utsumi mine and the Morro do Ferro analogue study sites, Poços de Caldas, Minas Gerais, Brazil
D. Kirk Nordstrom, R.H. McNutt, I. Puigdomenech, John A.T. Smellie, M. Wolf
1992, Journal of Geochemical Exploration (45) 249-287
Surface and ground waters, collected over a period of three years from the Osamu Utsumi uranium mine and the Morro do Ferro thorium/rare-earth element (Th/REE) deposits, were analyzed and interpreted to identify the major hydrogeochemical processes. These results provided information on the current geochemical evolution of ground...
Collapse and flow of lowstand shelf-margin deposits: An example from the eastern Tyrrhenian Sea, Italy
F. Trincardi, M.E. Field
1992, Marine Geology (105) 77-94
The upper slope of the eastern Tyrrhenian Sea margin has a complex morphology shaped by Quaternary tectonism and by sedimentation phases controlled by changing sea levels. Sediment slides of widely varying size and shape are common in Quaternary deposits of the...
Toward digital geologic map standards: a progress report
George E. Ulrech, Mitchell W. Reynolds, Richard B. Taylor
1992, Conference Paper, ASTM Special Technical Publication
Establishing modern scientific and technical standards for geologic maps and their derivative map products is vital to both producers and users of such maps as we move into an age of digital cartography. Application of earth-science data in complex geographic information systems, acceleration of geologic map production, and reduction of...
Adaptations to standard drilling equipment and procedures for a USBM overcore In Situ stress determination under unique conditions
J. K. Odum, F. T. Lee, J.W. Stone
1992, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (29) 73-76
[No abstract available]...
Volcanic geology and eruption frequency, lower east rift zone of Kilauea volcano, Hawaii
R. B. Moore
1992, Bulletin of Volcanology (54) 475-483
Detailed geologic mapping and radiocarbon dating of tholeiitic basalts covering about 275 km2 on the lower east rift zone (LERZ) and adjoining flanks of Kilauea volcano, Hawaii, show that at least 112 separate eruptions have occurred during the past 2360 years. Eruptive products include spatter ramparts and cones, a shield,...
Duck virus enteritis
D. E. Docherty, J. C. Franson
A.E. Castro, W.P. Heuschele, editor(s)
1992, Book chapter, Veterinary diagnostic virology: A practitioner's guide
No abstract available....
Differential unroofing within the central metasedimentary Belt of the Grenville Orogen: constraints from 40Ar/39Ar thermochronology
M. A. Cosca, E.J. Essene, Michael J. Kunk, J. F. Sutter
1992, Contributions to Mineralogy and Petrology (110) 211-225
An 40Ar/39Ar thermochronological investigation of upper greenschist to granulite facies gneiss, amphibolite and marble was conducted in the Central Metasedimentary Belt (CMB), Ontario, to constrain its cooling history. Incremental 40Ar/39Ar release spectra indicate that substantial differential unroofing occurred in the CMB between ??? 1000 and ??? 600 Ma. A consistent...
Laser-excited fluorescence of rare earth elements in fluorite: Initial observations with a laser Raman microprobe
R.C. Burruss, T.G. Ging, R. G. Eppinger, a.M. Samson
1992, Geochimica et Cosmochimica Acta (56) 2713-2723
Fluorescence emission spectra of three samples of fluorite containing 226–867 ppm total rare earth elements (REE) were excited by visible and ultraviolet wavelength lines of an argon ion laser and recorded with a Raman microprobe spectrometer system. Narrow emission lines (< 1 nm) due to 4f-4f electron transitions in individual...
Bioaccumulation of hydrocarbons derived from terrestrial and anthropogenic sources in the Asian clam, Potamocorbula amurensis, in San Francisco Bay estuary
Wilfred E. Pereira, Frances D. Hostettler, John B. Rapp
1992, Marine Pollution Bulletin (24) 103-109
An assessment was made in Suisun Bay, California, of the distributions of hydrocarbons in estuarine bed and suspended sediments and in the recently introduced asian clam, Potamocorbula amurensis. Sediments and clams were contaminated with hydrocarbons derived from petrogenic and pyrogenic sources. Distributions of alkanes and of hopane and sterane biomarkers in...
Data set for verification of 3-D free-surface hydrodynamic models, Carquinez Strait, California
P. E. Smith, R.N. Oltmann, M.R. Simpson
1992, Conference Paper, Proceedings of the Hydraulic Engineering Sessions Water Forum 1992
No abstract available....
The biogeochemical cycling of trace metals in the water column of Lake Sammamish, Washington: Response to seasonally anoxic conditions
Laurie S. Balistrieri, J.W. Murray, B. Paul
1992, Limnology and Oceanography (37) 529-548
Total acid‐soluble and dissolved Cd, Co, Cr, Cu, Ni, Pb, and Zn concentrations in the water column of a seasonally anoxic lake (Lake Sammamish, Washington) were measured on a monthly basis during the course of a year. These data, in conjunction with Fe, Mn, sulfide, and nutrient...
Sampling design for spatially distributed hydrogeologic and environmental processes
G. Christakos, Ricardo A. Olea
1992, Advances in Water Resources (15) 219-237
A methodology for the design of sampling networks over space is proposed. The methodology is based on spatial random field representations of nonhomogeneous natural processes, and on optimal spatial estimation techniques. One of the most important results of random field theory for physical sciences is its rationalization of correlations in...
Late Pleistocene equilibrium-line reconstructions in the northern Peruvian Andes
D. T. Rodbell
1992, Boreas (21) 43-52
ELA reconstructions using the toe-to-headwall-altitude ratio method for paleoglaciers in the Cordilleras Blanca and Oriental, northern Peruvian Andes indicate that ELAs during the last glacial maximum (LGM; marine isotope stage 2)) were c.4300 m in the Cordillera Blanca, c.3900-3600 m on the west side of the Cordillera Oriental, and c.3200...
Seasonal changes in the spatial distribution of phytoplankton in small, temperate-zone lakes
J. E. Cloern, A.E. Alpine, B.E. Cole, T. Heller
1992, Journal of Plankton Research (14) 1017-1024
Seasonal sampling across two small lakes shows that phytoplankton patchiness is greatly enhanced during winter ice-cover relative to the open-water seasons of exposure to wind stress and rapid turbulent mixing....
Thermal waters along the Konocti Bay fault zone, Lake County, California: a re-evaluation
J. M. Thompson, Robert H. Mariner, L. D. White, T. S. Presser, William C. Evans
1992, Journal of Volcanology and Geothermal Research (53) 167-183
The Konocti Bay fault zone (KBFZ), initially regarded by some as a promising target for liquid-dominated geothermal systems, has been a disappointment. At least five exploratory wells were drilled in the vicinity of the KBFZ, but none were successful. Although the Na-K-Ca and Na-Li geothermometers indicate that the thermal waters...
