Uranium geochemistry in geopressured-geothermal aquifers of the U.S. Gulf Coast
T. F. Kraemer, Y.K. Kharaka
1986, Geochimica et Cosmochimica Acta (50) 1233-1238
Formation water from U.S. Gulf Coast geopressured-geothermal sandstone aquifers has been analyzed to determine the geochemistry of uranium in these systems. Results of chemical analyses and chemical equilibrium modeling indicate the formation waters are in equilibrium with uraninite (UO2) and coffinite (USiO4). The 234U238U">234U238U activity ratios...
Lead-isotopic data from sulfide minerals from the Cascade Range, Oregon and Washington
S. E. Church, A.P. LeHuray, A.R. Grant, M.H. Delevaux, J. E. Gray
1986, Geochimica et Cosmochimica Acta (50) 317-328
Lead-isotopic studies of mineral deposits associated with Tertiary plutons found in the Cascade Range of Oregon and Washington demonstrate a rather uniform isotopic composition in various sulfide minerals (206Pb204Pb= 18.84 to 19.05">206Pb204Pb= 18.84 to 19.05; 207Pb204Pb= 15.57 to 15.62">207Pb204Pb=...
SALTON SEA SCIENTIFIC DRILLING PROJECT: SCIENTIFIC PROGRAM.
J.H. Sass, W.A. Elders
1986, Bulletin. Geothermal Resources Council 21-26
The Salton Sea Scientific Drilling Project, was spudded on 24 October 1985, and reached a total depth of 10,564 ft. (3. 2 km) on 17 March 1986. There followed a period of logging, a flow test, and downhole scientific measurements. The scientific goals were integrated smoothly with the engineering and...
Tectonic significance of precambrian apatite fission-track ages from the midcontinent United States
K.D. Crowley, C. W. Naeser, C.A. Babel
1986, Earth and Planetary Science Letters (79) 329-336
Apparent apatite fission-track ages from drill core penetrating basement on the flank of the Transcontinental Arch in northwestern Iowa range from 934 ± 86 to 641 ± 90 Ma. These ages, the oldest reported in North America, record at least two...
An interpretation of induced electric currents in long pipelines caused by natural geomagnetic sources of the upper atmosphere
W.H. Campbell
1986, Surveys in Geophysics (8) 239-259
Electric currents in long pipelines can contribute to corrosion effects that limit the pipe's lifetime. One cause of such electric currents is the geomagnetic field variations that have sources in the Earth's upper atmosphere. Knowledge of the general behavior of the sources allows a prediction of the occurrence times, favorable...
Late-Wisconsin paleohydrology of the West-Central Amargosa Desert, Nevada, U.S.A.
H.C. Claassen
1986, Chemical Geology: Isotope Geoscience Section (58) 311-323
Studies of isotopes in groundwater using 14C, 2H (deuterium) and 18O have provided significant insight into the paleoclimate of middle and late Wisconsin age in a typical arid environment of southern Nevada, the west-central Amargosa Desert. Evidence indicates that recharge probably was through infiltration of...
CLASSIFICATION AND BEHAVIOR OF MEANDER MIGRATION.
Edward H. Martin, Hsieh W. Shen, J. Glover
1986, Conference Paper
Meander migrations on the Mississippi River between Cairo, Illinois and Baton Rouge, Louisiana for the time period between the years 1765 and 1930 were classified into six categories based on the nature of channel movements. During the time period between 1765 and 1900, man's disturbance on this river reach was...
SALTWATER INTRUSION IN A HIGHLY TRANSMISSIVE UNCONFINED AQUIFER.
Bradley G. Waller
1986, Conference Paper
Saltwater intrusion is particularly dynamic in coastal Dade County because of the high permeability of the Biscayne aquifer, because of the good interconnection between canals and the aquifer, and because of the seasonal rainfall. The problem is accentuated as urban growth continues to encroach on inland wetland areas which results...
Pb-, Sr- and Nd-Isotopic systematics and chemical characteristics of cenozoic basalts, Eastern China
Z. C. Peng, R. E. Zartman, K. Futa, D.G. Chen
1986, Chemical Geology (59) 3-33
Forty-eight Paleogene, Neogene and Quaternary basaltic rocks from northeastern and east-central China have been analyzed for major-element composition, selected trace-element contents, and Pb, Sr and Nd isotopic systematics. The study area lies entirely within the marginal Pacific tectonic domain. Proceeding east to...
Mars: A water-rich planet?
M. H. Carr
1986, Icarus (68) 187-216
Mars had outgassed at least 0.5 to 1 km of water, 10 to 20 bar of CO2, and 0.1 to 0.3 bar of N2. The volatiles that have been retained are mostly in the cratered uplands. Terrain softening, fretted channels, debris...
Cluster molecular orbital description of the electronic structures of mixed-valence iron oxides and silicates
David M. Sherman
1986, Solid State Communications (58) 719-723
A molecular orbital description, based on spin-unrestricted Xα-scattered wave calculations, is given for the electronic structures of mixed valence iron oxides and silicates. The cluster calculations show that electron hopping and optical intervalence charge-transger result from weak FeFe bonding across shared edges of FeO6 coordination polyhedra. In agreement with Zener's double exchange...
Effect of sediment depth and sediment type on the survival of Vallisneria americana Michx grown from tubers
Nancy B. Rybicki, Virginia Carter
1986, Aquatic Botany (24) 233-240
Sedimentation resulting from storms may have been one of the reasons for the elimination of submersed aquatic vegetation from the tidal Potomac River in the late 1930's. Laboratory studies were conducted to investigate the effects of different depths of overlying sediment and composition of sediment on the survival of Vallisneria americana Michx...
Isotope geochemistry of recent magmatism in the Aegean arc: Sr, Nd, Hf, and O isotopic ratios in the lavas of Milos and Santorini-geodynamic implications
L. Briqueu, M. Javoy, J.R. Lancelot, M. Tatsumoto
1986, Earth and Planetary Science Letters (80) 41-54
In this comparative study of variations in the isotopic compositions (Sr, Nd, O and Hf) of the calc-alkaline magmas of the largest two volcanoes, Milos and Santorini, of the Aegean arc (eastern Mediterranean) we demonstrate the complexity of the processes governing the evolution of the magmas on the scale both...
A finite element model for tidal and residual circulation
Roy A. Walters
1986, Communications in Numerical Methods in Engineering (2) 393-398
Harmonic decomposition is applied to the shallow water equations, thereby creating a system of equations for the amplitude of the various tidal constituents and for the residual motions. The resulting equations are elliptic in nature, are well posed and in practice are shown to be numerically well-behaved. There are a...
Alternate forms of the associated Legendre functions for use in geomagnetic modeling.
L.R. Alldredge, E.R. Benton
1986, Journal of Geomagnetism & Geoelectricity (38) 599-609
An inconvenience attending traditional use of associated Legendre functions in global modeling is that the functions are not separable with respect to the two indices (order and degree). In 1973 Merilees suggested a way to avoid the problem by showing that associated Legendre functions of order m and degree m+k can be expressed in...
Local Magnetic Fields, Uplift, Gravity, and Dilational Strain Changes in Southern California
M.J.S. Johnston
1986, Journal of Geomagnetism & Geoelectricity (38) 933-947
Measurements of regional magnetic field during gravity, strain and leveling surveys near the San Andreas fault at Cajon, Palmdale and Tejon are strongly correlated with changes in gravity, areal strain, and uplift in these regions during the period 1977-1984. This correlation principally depends on data taken during 1978-79...
A ground-water mixing model for the origin of the Imini manganese deposit (Cretaceous) of Morocco
E. R. Force, W. Back, E.C. Spiker, L.P. Knauth
1986, Economic Geology (81) 65-79
Three beds of manganese oxide ore in a 10 m-thick dolomite unit are associated with diagenetic features, and, are accordingly also diagenetic in their present aspect. Whether primary or introduced, the Mn mineralogy is attributed to reactions between fresh and saline ground-waters as the zone of mixing passed through the...
Ground-water resource assessment of the Montauk area, Long Island, New York
K. R. Prince
1986, Water-Resources Investigations Report 85-4013
The water resources of the Montauk area were investigated from October 1980 through September 1983 to assess the availability of fresh groundwater. The principal aquifer, which consists of fine- to coarse-grained stratified glacial drift, is the sole source of freshwater. The freshwater/saltwater interface lies as much as 150 ft below...
Shuttle imaging radar: Physical controls on signal penetration and subsurface scattenng in the Eastern Sahara
Gerald G. Schaber, John F. McCauley, Carol S. Breed, Gary R. Olhoeft
1986, IEEE Transactions on Geoscience and Remote Sensing (GE-24) 603-623
SIR-A signal penetration and subsurface backscatter within the upper meter or so of the sediment blanket in the Eastern Sahara of southern Egypt and northern Sudan are enhanced both by radar sensor parameters and by the physical and chemical characteristics of eolian and alluvial materials. Interpretation of SIR-A images by...
A Brief History of the U.S. Geological Survey
Mary C. Rabbitt
1986, Book
[Book review] Fish immunology, edited by M. J. Manning and M. F. Tatner
B.R. Griffin
1986, Transactions of the American Fisheries Society (115) 641-642
Review of: Fish Immunology. Edited by M. J. Manning and M. F. Tatner. Academic Press, London. 1985. 374 pages. $32.50. Reviewed by B. R. Griffin, Fish Farming Experimental Station, U.S. Fish and Wildlife Service, Stuttgart, Arkansas 72160, USA....
Marine otters and their environment
J. A. Estes
1986, Ambio (15) 181-183
[Book review] Otters. Ecology and Conservation, by C. F. Mason and S. M. MacDonald
J. A. Estes
1986, Science (233) 1333-1334
Review of: Otters. Ecology and Conservation. C. F. Mason and S. M. MacDonald. Cambridge University Press, New York, 1986, viii, 236 pp., illus. $34.50....
A comparison of burn season effects on nesting birds in North Dakota mixed-grass prairie
K.F. Higgins
1986, Prairie Naturalist (18) 219-228
During 1982-1985, the effects of single spring and fall burn treatments on ground nesting birds and residual cover were studied on five paired areas of native mixed-grass prairie in northwestern Stutsman County, ND. Annually, visual obstruction readings to index the height-density of residual cover were taken once and nest searches...
Founding populations in conservation: Problems and characteristics of small populations
C. Schonewald-Cox
F.J. Brenner, S.K. Majumdar, Ann Rhoads, editor(s)
1986, Book chapter, Endangered and Threatened Species Programs in Pennsylvania and Other States: Causes, Issues, and Management.
No abstract available at this time...
