Variation of wet deposition chemistry in Sequoia National Park, California
Thomas J. Stohlgren, David J. Parsons
1987, Atmospheric Environment (21) 1369-1374
Sequoia National Park has monitored wet deposition chemistry in conjunction with the National Atmospheric Deposition Program and National Trends Network (NADP/NTN), on a weekly basis since July, 1980. Annual deposition of H, NO3 and SO4 (0.045, 3.6, and 3.9 kg ha−1 a−1, respectively) is relatively low compared to that measured...
Behavioral modification of reproduction in coyotes
D. A. Barnum, J.T. Flinders, J.S. Green
J.S. Green, editor(s)
1987, Protecting livestock from coyotes. A synopsis of research of the Agricultural Research Service. 10-29
No abstract available at this time...
Use of slope, aspect, and elevation maps derived from digital elevation model data in making soil surveys
A. A. Klingebiel, E. H. Horvath, D. G. Moore, W.U. Reybold
1987, Book chapter, Soil survey techniques, SSSA Special Publication 20
Maps showing different classes of slope, aspect, and elevation were developed from U.S. Geological Survey digital elevation model data. The classes were displayed on clear Mylar at 1:24 000-scale and registered with topographic maps and orthophotos. The maps were used with aerial photographs, topographic maps, and other resource data to...
Magmatic history of Red Sea rifting: Perspective from the central Saudi Arabian coastal plain
J.S. Pallister
1987, Geological Society of America Bulletin (98) 400-417
A newly recognized Tertiary dike complex and comagmatic volcanic rocks exposed on the central Saudi Arabian coastal plain record early stages of magmatism related to Red Sea rifting. Intrusive and stratigraphic relationships and new potassium-argon dating indicate episodic magmatism from about 30 Ma to the present. Additional stratigraphic and radiometric...
A model for tides and currents in the English Channel and southern North Sea
Roy A. Walters
1987, Conference Paper, Advances in Water Resources
The amplitude and phase of 11 tidal constituents for the English Channel and southern North Sea are calculated using a frequency domain, finite element model. The governing equations - the shallow water equations - are modifed such that sea level is calculated using an elliptic equation of the Helmholz type...
Evidence for Late-Paleozoic brine migration in Cambrian carbonate rocks of the central and southern Appalachians: Implications for Mississippi Valley-type sulfide mineralization
P.P. Hearn Jr., J. F. Sutter, H. E. Belkin
1987, Geochimica et Cosmochimica Acta (51) 1323-1334
Many Lower Paleozoic limestones and dolostones in the Valley and Ridge province of the central and southern Appalachians contain 10 to 25 weight percent authigenic potassium feldspar. This was considered to be a product of early diagenesis, however, 40Ar39Ar">40Ar39Ar analyses of overgrowths on detrital K-feldspar in...
The geochemistry of water near a surficial organic-rich uranium deposit, northeastern Washington State, U.S.A.
R. A. Zielinski, J. K. Otton, R. B. Wanty, C. T. Pierson
1987, Chemical Geology (62) 263-289
The chemistry of three stream, three spring and six near-surface waters in the vicinity of a Holocene organic-rich uranium deposit is described, with particular emphasis on the chemistry of U. Results characterize the solution behavior of uranium as U-bearing water interacts with relatively undecomposed, surficial organic matter. Of the measured...
Analyzing numerical errors in domain heat transport models using the CVBEM
T. V. Hromadka II
1987, Journal of Offshore Mechanics and Arctic Engineering (109) 163-169
Besides providing an exact solution for steady-state heat conduction processes (Laplace-Poisson equations), the CVBEM (complex variable boundary element method) can be used for the numerical error analysis of domain model solutions. For problems where soil-water phase change latent heat effects dominate the thermal regime, heat transport can be approximately modeled...
Detection of a locked zone at depth on the Parkfield, California, segment of the San Andreas fault
R.A. Harris, P. Segall
1987, Journal of Geophysical Research Solid Earth (92) 7945-7962
The Parkfield, California, segment of the San Andreas fault is transitional in character between the creeping segment of the fault to the northwest and the locked Carrizo Plain segment to the southeast. The rate of shallow fault slip decreases from 25–30 mm/yr northwest of the epicenter of the 1966 Parkfield...
Infragravity waves over a natural barred profile
A. H. Sallenger Jr., R.A. Holman
1987, Journal of Geophysical Research Solid Earth (92) 9531-9540
Measurements of cross-shore flow were made across the surf zone during a storm as a nearshore bar became better developed and migrated offshore. Measured infragravity band spectra were compared to synthetic spectra calculated numerically over the natural barred profile assuming a white run-up spectrum of leaky mode or high-mode edge...
Bundled slaty cleavage in laminated argillite, north-central Minnesota
D. L. Southwick
1987, Journal of Structural Geology (9) 985-993
Exceptional bundled slaty cleavage (defined herein) has been found in drill cores of laminated, folded, weakly metamorphosed argillite at several localities in the early Proterozoic Animikie basin of north-central Minnesota. The cleavage domains are more closely spaced within the cleavage bundles...
The distribution of nitrogen species and adsorption of ammonium in sediments from the tidal Potomac River and estuary
N.S. Simon, M.M. Kennedy
1987, Estuarine, Coastal and Shelf Science (25) 11-26
The distribution of dissolved ammonium, adsorbed ammonium and residual, organic and total nitrogen was measured in Potomac River tidal, transition zone and lower estuary sediments to a depth of 66 cm. For these sediments, exchangeable ammonium, and thereby adsorbed ammonium concentrations, were determined directly using an ammonia electrode in alkaline...
An empirical model for estimating phytoplankton productivity in estuaries
B.E. Cole, J. E. Cloern
1987, Marine Ecology Progress Series (396) 299-305
e have previously shown that primary productivity in San Francisco Bay, USA, is highly correlated with phytoplankton biomass B (chlorophyll a concentration) and an index of light avallability in the photic zone, 2, I, (photic depth times surface irradiance). To test the generality of this relation, we compiled data from...
Stable isotope compositions and water contents of boninite series volcanic rocks from Chichi-jima, Bonin Islands, Japan
P.F. Dobson, J. R. O’Neil
1987, Earth and Planetary Science Letters (82) 75-86
Measurements of stable isotope compositions and water contents of boninite series volcanic rocks from the island of Chichi-jima, Bonin Islands, Japan, confirm that a large amount (1.6–2.4 wt.%) of primary water was present in these unusual magmas. An enrichment of 0.6‰...
Biogeochemical cycling in an organic-rich coastal marine basin. 8. A sulfur isotopic budget balanced by differential diffusion across the sediment-water interface
J. P. Chanton, C.S. Martens, M. B. Goldhaber
1987, Geochimica et Cosmochimica Acta (51) 1201-1208
The sulfur isotopic composition of the sulfur fluxes occurring in the anoxic marine sediments of Cape Lookout Bight, N.C., U.S.A., was determined, and the result of isotopic mass balance was obtained via the differential diffusion model. Seasonal pore water sulfate δ34S measurements yielded a calculated sulfate input of 0.6%.. Sulfate transported into the sediments via diffusion...
Transport of reacting solutes subject to a moving dissolution boundary: Numerical methods and solutions
Catherine Willis, Jacob Rubin
1987, Water Resources Research (23) 1561-1574
A moving boundary problem which arises during transport with precipitation-dissolution reactions is solved by three different numerical methods. Two of these methods (one explicit and one implicit) are based on an integral formulation of mass balance and lead to an approximation of a weak solution. These methods are compared to...
Moment tensor solutions estimated using optimal filter theory for 51 selected earthquakes, 1980-1984
S.A. Sipkin
1987, Physics of the Earth and Planetary Interiors (47) 67-79
The 51 global events that occurred from January 1980 to March 1984, which were chosen by the convenors of the Symposium on Seismological Theory and Practice, have been analyzed using a moment tensor inversion algorithm (Sipkin). Many of the events were routinely analyzed as part of the National Earthquake Information...
Evolution, biogeography, and systematics of Puriana: evolution and speciation in Ostracoda, III.
T. M. Cronin
1987, Journal of Paleontology (61)
Three types of geographic isolation—land barriers, deep water barriers, and climatic barriers—resulted in three distinct evolutionary responses in Neogene and Quaternary species of the epineritic ostracode genus Puriana. Through systematic, paleobiogeographic, and morphologic study of several hundred fossil and Recent populations from the eastern Pacific, western Atlantic,...
Evaluation of the stability of gas hydrates in Northern Alaska
A. Kamath, S. P. Godbole, R. D. Ostermann, T. S. Collett
1987, Cold Regions Science and Technology (14) 107-119
The factors which control the distribution of in situ gas hydrate deposits in colder regions such as Northern Alaska include; mean annual surface temperatures (MAST), geothermal gradients above and below the base of permafrost, subsurface pressures, gas composition, pore-fluid salinity and the soil condition. Currently existing data on the above...
Playa-lake basins on the Southern High Plains of Texas and New Mexico: Part II. A hydrologic model and mass-balance arguments for their development.
W.W. Wood, W. R. Osterkamp
1987, Geological Society of America Bulletin (99) 224-230
Hydrologic, geologic, geomorphic, and mass-balance data suggest that most of the ∼30,000 playa lake basins on the Southern High Plains have developed by a combination of dissolution of caliche and piping of surface material into the unsaturated zone rather than by eolian processes as has generally been stated. A conceptual...
Compositional evidence regarding the origins of rims on Semarkona chondrules
J. N. Grossman, J. T. Wasson
1987, Geochimica et Cosmochimica Acta (51) 3003-3011
The compositions of the interiors and abraded surfaces of 7 chondrules from Semarkona (LL3.0) were measured by neutron activation analysis. For nonvolatile elements, the lithophile and siderophile element abundance patterns in the surfaces are generally similar to those in the corresponding interiors. Siderophile and chalcophile concentrations are much higher in...
Modeling and analysis of direct-current electrical resistivity in the Durham Triassic basin, North Carolina
C. Erwin Brown
1987, Geoexploration (24) 429-440
Sixty-two Schlumberger electrical soundings were made in the Durham Triassic basin in an effort to determine basin structural geometry, depth of the sedimentary layers, and spatial distribution of individual rock facies. A digital computer program was used to invert the sounding curves of apparent resistivity versus distance to apparent resistivity...
Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire
T.M. Harrison, J. N. Aleinikoff, W. Compston
1987, Geochimica et Cosmochimica Acta (51) 2549-2558
U-Pb analyses of zircons separated from two Concord-type plutons near Sunapee and Dixville Notch, New Hampshire, reveal differences in the pattern and magnitude of zircon inheritance which are related to differences in melt chemistry. The Sunapee pluton contains only slightly more Zr than required to saturate the melt at the...
Coal deposits of the United States
Nelson W. John
1987, International Journal of Coal Geology (8) 355-365
The coal fields of the Unites States can be divided into six major provinces. The Appalachian and Interior Provinces contain dominantly bituminous coal in strata of Pennsylvanian age. The coal seams are relatively thin and are mined both by surface and...
Sulfur and lead isotope studies of stratiform Zn-Pb-Ag deposits, Anvil Range, Yukon: Basinal brine exhalation and anoxic bottom-water mixing (Canada)
Wayne C. Shanks III, L. G. Woodruff, G.A. Jilson, D.S. Jennings, J.S. Modene, B.D. Ryan
1987, Economic Geology (82) 600-634
Five stratiform Zn-Pb-Ag deposits are known in Early Cambrian metapelitic rocks along a curvilinear trend in the Anvil Range, central Yukon. The Anvil Range deposits occur along the southwestern boundary of the Selwyn basin in the stratigraphic transition zone between metapelites of the Mt. Mye unit and calcareous phyllites of...
