Variables indicating nitrate contamination in Bedrock Aquifers, Newark Basin, New Jersey
R.M. Clawges, E. F. Vowinkel
1996, Water Resources Bulletin (32) 1055-1066
Variables that describe well construction, hydrogeology, and land use were evaluated for use as possible indicators of the susceptibility of ground water in bedrock aquifers in the Newark Basin. New Jersey, to contamination by nitrate from the land surface. Statistical analyses were performed on data for 132 wells located throughout...
Urban seismology - Northridge aftershocks recorded by multi-scale arrays of portable digital seismographs
M. Meremonte, A. Frankel, E. Cranswick, D. Carver, D. Worley
1996, Bulletin of the Seismological Society of America (86) 1350-1363
We deployed portable digital seismographs in the San Fernando Valley (SFV), the Los Angeles basin (LAB), and surrounding hills to record aftershocks of the 17 January 1994 Northridge California earthquake. The purpose of the deployment was to investigate factors relevant to seismic zonation...
Agricultural chemicals at the outlet of a shallow carbonate aquifer
G.K. Felton
1996, Transactions of the American Society of Agricultural Engineers (39) 873-882
A groundwater catchment, located in Woodford and Jessamine Counties in the Inner Bluegrass of Kentucky, was instrumented to develop long- term flow and water quality data. The land uses on this 1 620-ha catchment consist of approximately 59% in grasses consisting of beef farms, horse farms, and a golf course;...
Late Pliocene diatoms in a diatomite from Prydz Bay, East Antarctica
A.D. Mahood, J.A. Barron
1996, Micropaleontology (42) 285-302
Very well-preserved Pliocene diatoms from a diatomite unit interbedded within glacial sediments at Ocean Drilling Program Site 742 in Prydz Bay, Antarctica are documented and illustrated. The presence of Thalassiosira kolbei, T. torokina, Actinocyclus actinochilus, A. karstenii and the absence of Nitzschia interfrigidaria. T. insigna and T. vulnifica in Sample...
Crystal structures of [NEt3H]5[XCoIIW11O39]·3H2O (X = P or As)
H. T. Evans Jr., T.J.R. Weakley, G.B. Jameson
1996, Journal of the Chemical Society, Dalton Transactions 2537-2540
The orthorhombic crystal structures of [NEt3H]5[XCoIIW11O39]·3H2O for X = P and As have been determined with data collected at room temperature, and for X = P at –100 °C, using Mo-Kα radiation. For the latter the space group is Pna21, a= 21.670(11), b= 14.805(4), c= 20.393(5)Å and Z= 4. The...
Enriched Nd-Sr-Pb isotopic signatures in the Dovyren layered intrusion ( eastern Siberia, Russia): Evidence for source contamination by ancient upper-crustal material
Yu. V. Amelin, L.A. Neymark, E. Yu Ritsk, A.A. Nemchin
1996, Chemical Geology (129) 39-69
Major- and trace-element concentrations and Nd-, Sr- and Pb-isotopic ratios are reported for the Dovyren layered mafic-ultramafic intrusion in the northern Baikal region, eastern Siberia. Sm-Nd internal isochrons for an olivine gabbro from the layered series and a gabbronorite from a sill at the bottom of the Dovyren intrusion yield...
Solid solution partitioning of Sr2+, Ba2+, and Cd2+ to calcite
A. J. Tesoriero, J. F. Pankow
1996, Geochimica et Cosmochimica Acta (60) 1053-1063
Although solid solutions play important roles in controlling the concentrations of minor metal ions in natural waters, uncertainties regarding their compositions, thermodynamics, and kinetics usually prevent them from being considered. A range of precipitation rates was used here to study the nonequilibrium and equilibrium partitioning behaviors of Sr2+, Ba2+, and...
Localized alteration of the paintbrush nonwelded hydrologic unit within the exploratory studies facility
Z. E. Peterman, R.W. Spengler, F.R. Singer, S.C. Beason
1996, Conference Paper, High Level Radioactive Waste Management - Proceedings of the Annual International Conference
The mound-like feature in the lower part of the PTn, composed of highly disrupted strata and open-system alteration were the result of intense water-rock interaction. This feature was formed by fumarolic activity during cooling of the 12.8 Ma Topopah Spring Tuff and prior to deposition of the pre-Pah Canyon bedded...
The 1994 Northridge, California, earthquake: Investigation of rupture velocity, risetime, and high-frequency radiation
S. Hartzell, P. Liu, C. Mendoza
1996, Journal of Geophysical Research B: Solid Earth (101) 20091-20108
A hybrid global search algorithm is used to solve the nonlinear problem of calculating slip amplitude, rake, risetime, and rupture time on a finite fault. Thirty-five strong motion velocity records are inverted by this method over the frequency band from 0.1 to 1.0 Hz for the Northridge earthquake. Four regions...
Simple method for the measurement of the hydrogenotrophic methanogenic activity of anaerobic sludges
J.D. Coates, M.F. Coughlan, E. Colleran
1996, Journal of Microbiological Methods (26) 237-246
The specific hydrogenotrophic activity of anaerobic sludges is usually assayed by gas chromatographic analysis for methane in the headspace of sealed test vials. Gas is sampled with a pressure lock syringe which allows quantification independent of the pressure prevailing in the vials. An alternative method was developed using pressure transducer...
Paragenetic and minor- and trace-element studies of Mississippi Valley-type ore deposits of the Silesian-Cracow district, Poland
J.G. Viets, D. L. Leach, F.E. Lichte, R.T. Hopkins, C. A. Gent, J. W. Powell
1996, Prace - Panstwowego Instytutu Geologicznego (154) 36-71
Paragenetic and minor- and trace-element studies were conducted on samples of epigenetic ore and gangue minerals collected from mines and drill core in the Silesian-Cracow (S-C) district of southern Poland. Four discrete mineral suites representing four mineralizing stages can be identified throughout the district. The earliest epigenetic minerals deposited during...
Mobility of 2,2',5,5'-tetrachlorobiphenyl in model systems containing bottom sediments and water from the lower Fox River, Wisconsin
J. F. Elder, R.V. James, J. J. Steuer
1996, Journal of Great Lakes Research (22) 697-706
Sediment-water partitioning and diffusive transport of 2,2’,5,5’-tetrachlorobiphenyl, PCB congener IUPAC #52 (TCB52) were examined in laboratory experiments with sediments from two sites in the lower Fox River, Wisconsin. Native water was pumped at controlled flow rates through cells containing sediments amended...
Problems associated with using filtration to define dissolved trace element concentrations in natural water samples
A. J. Horowitz, K.R. Lum, J.R. Garbarino, G.E.M. Hall, C. Lemieux, C. R. Demas
1996, Environmental Science & Technology (30) 954-963
Field and laboratory experiments indicate that a number of factors associated with filtration other than just pore size (e.g., diameter, manufacturer, volume of sample processed, amount of suspended sediment in the sample) can produce significant variations in the “dissolved” concentrations of such elements as Fe, Al, Cu, Zn, Pb, Co,...
Rupture distribution of the 1977 western Argentina earthquake
C.J. Langer, S. Hartzell
1996, Physics of the Earth and Planetary Interiors (94) 121-132
Teleseismic P and SH body waves are used in a finite-fault, waveform inversion for the rupture history of the 23 November 1977 western Argentina earthquake. This double event consists of a smaller foreshock (M0 = 5.3 ?? 1026 dyn-cm) followed about 20 s later by a larger main shock (M0...
Trihalomethane and nonpurgeable total organic-halide formation potentials of the Mississippi river
R. E. Rathbun
1996, Archives of Environmental Contamination and Toxicology (30) 156-162
Trihalomethane and nonpurgeable total organic-hallide formation potentials were determined for water samples from 12 sites along the Mississippi River from Minneapolis, MN, to New Orleans, LA, for the summer and fall of 1991 and the spring of 1992. The formation potentials increased with distance upstream, approximately paralleling the increase of...
Isotopic evidence for shifts in atmospheric circulation patterns during the late Quaternary in mid-North America
Ronald Amundson, O. Chadwick, C. Kendall, Y. Wang, M. DeNiro
1996, Geology (24) 23-26
Wyoming is now at the eastern margin of westerlies originating in the Pacific, but in the Pleistocene appears to have received moisture from elsewhere, possibly the Gulf of Mexico. Oxygen isotope ratios of pedogenic carbonate in postglacial terraces correspond to ratios in equilibrium...
Copper speciation and binding by organic matter in copper-contaminated streamwater
R.F. Breault, J.A. Colman, G. R. Aiken, D. McKnight
1996, Environmental Science & Technology (30) 3477-3486
Fulvic acid binding sites (1.3−70 μM) and EDTA (0.0017−0.18 μM) accounted for organically bound Cu in seven stream samples measured by potentiometric titration. Cu was 84−99% organically bound in filtrates with 200 nM total Cu. Binding of Cu by EDTA was limited by competition from other trace...
Roof-rock contamination of Taylor Creek Rhyolite, New Mexico, as recorded in hornblende phenocrysts and biotite xenocrysts
J.H. Wittke, W. A. Duffield, C. Jones
1996, American Mineralogist (81) 135-140
The Taylor Creek Rhyolite, a group of coeval, mid-Tertiary, silica-rich rhyolite lava domes in southwestern New Mexico, is notable for recording bulk-rock evidence of minor, yet easily measurable, contamination of its source magma reservoir resulting from assimilation of Proterozoic roof rock. Most of the evidence is recorded in trace element...
Near bottom velocity measurements in San Francisco Bay, California
Jeffrey W. Gartner, Ralph T. Cheng
Anon, editor(s)
1996, Conference Paper, Oceans Conference Record (IEEE)
The ability to accurately measure long-term time-series of tidal currents in bays and estuaries is critical in estuarine hydrodynamic studies. Accurate measurements of tidal currents near the air-water interface and in the bottom boundary layer remain difficult in spite of the significant advances in technology for measuring tidal currents which...
Using thermal-infrared imagery to delineate ground-water discharge
W.S.L. Banks, R. L. Paylor, W.B. Hughes
1996, Groundwater (34) 434-443
On March 8 and 9, 1992, a thermal-infrared-multispectral scanner (TIMS) was flown over two military ordnance disposal facilities at the Edgewood Area of Aberdeen Proving Ground, Maryland. The data, collected by the National Aeronautics and Space Administration, in cooperation with the U.S. Army and...
Hydrogeology of the Hawaii Scientific Drilling Project borehole KP-1 1. Hydraulic conditions adjacent to the well bore
Frederick L. Paillet, D. M. Thomas
1996, Journal of Geophysical Research B: Solid Earth (101) 11675-11682
Temperature and formation resistivity logs obtained in borehole KP-1 of the Hawaii Scientific Drilling Project indicate that the adjacent formation is characterized by several zones of distinctly different average temperature and water salinity. A series of hydraulic analyses and water sampling programs were conducted to rule out the possibility of...
The reversibility of virus attachment to mineral surfaces
J.P. Loveland, J. N. Ryan, G.L. Amy, R.W. Harvey
1996, Colloids and Surfaces A: Physicochemical and Engineering Aspects (107) 205-221
Virus transport through groundwater is limited by attachment to mineral surfaces and inactivation. Current virus transport models do not consider the implications of the reversibility of virus attachment to minerals. To explore the reversibility of virus attachment to mineral surfaces, we attached PRD1, a bacteriophage considered to be a good...
Deep-sea ostracode shell chemistry (Mg:Ca ratios) and late Quaternary Arctic Ocean history
T. M. Cronin, Gary S. Dwyer, P.A. Baker, J. Rodriguez-Lazaro, W. M. Briggs Jr.
Andrews J.T.et al, editor(s)
1996, Geological Society Special Publication (111) 117-134
The magnesium:calcium (Mg:Ca) and strontium:calcium (Sr:Ca) ratios were investigated in shells of the benthic ostracode genus Krithe obtained from 64 core-tops from water depths of 73 to 4411 m in the Arctic Ocean and Nordic seas to determine the potential of ostracode shell chemistry for palaeoceanographic study. Shells from the...
Uranium-series dating of carbonate (tufa) deposits associated with quaternary fluctuations of Pyramid Lake, Nevada
Barney J. Szabo, C. A. Bush, L. V. Benson
1996, Quaternary Research (45) 271-281
Uranium-series dating of dense tufa deposited in a small cave, at former lake margins, and in large tufa mounds clarifies the timing of lake-level variation during the past 400,000 yr in the Pyramid Lake basin. A moderate-sized lake occasionally overflowed the Emerson Pass sill at elevation of ???1207 m between...
Waters associated with an active basaltic volcano, Kilauea, Hawaii: Variation in solute sources, 1973-1991
R.I. Tilling, B.F. Jones
1996, Geological Society of America Bulletin (108) 562-577
Chemical and isotopic analyses of samples collected from a December 1962-m-deep research borehole at the summit of Kilauea Volcano provide unique time-series data for composition of waters in the uppermost part of its hydrothermal system. These waters have a distinctive geochemical signature: a very low proportion of chloride relative to...
