Rocks of the Thirtynine Mile volcanic field as possible sources of uranium for epigenetic deposits in central Colorado, USA.
K. A. Dickinson
1987, Uranium (4) 43-65
The most likely volcanic source rock for uranium in epigenetic deposits of the Tallahassee Creek uranium district and nearby areas is the Wall Mountain Tuff. The widespread occurrence of the Tuff, its high apparent original uranium content, approx 11 ppm, and its apparent loss of uranium from devitrification and other...
Near infrared detection of ammonium minerals
M. D. Krohn, S. P. Altaner
1987, Geophysics (52) 924-930
Diagnostic near-infrared spectral features have been identified for minerals with ammonium (NH (super +) 4 ) bound in the crystal structure. Spectral bands near 2.12, 2.02, and 1.56 mu m are characteristic of synthetic and natural NH 4 -bearing minerals. Laboratory spectra of NH 4 -bearing minerals are distinct from spectra of OH-bearing minerals and have...
Volcanic processes in the Solar System
M. H. Carr
1987, Earthquakes & Volcanoes (USGS) (19) 128-137
This article stresses that terrestrial volcanism represents only part of the range of volcanism in the solar system. Earth processes of volcanicity are dominated by plate tectonics, which does not seem to operate on other planets, except possibly on Venus. Lunar volcanicity is dominated by lava effusion at enormous rates....
Convergent tectonics and coastal upwelling: a history of the Peru continental margin ( Pacific).
Roland E. von Huene, E. Suess, K.C. Emeis
1987, Episodes (10) 87-93
Late in 1986, scientists on the ODP drillship JOIDES Resolution confirmed that the upper slope of the Peruvian margin consists of continental crust whereas the lower slope comprises an accretionary complex. An intricate history of horizontal and vertical movements can be detected, and the locations of ancient centers of upwelling...
Residence of silver in mineral deposits of the Thunder Mountain caldera complex, Central Idaho, U.S.A.
B. F. Leonard, R.P. Christian
1987, Mineralogy and Petrology (36) 151-168
Silver is an accessory element in gold, antimony, and tungsten deposits of the caldera complex. Most of the deposits are economically of low grade and genetically of xenothermal or epithermal character. Their gold- and silver-bearing minerals are usually disseminated, fine grained, and difficult to study. Sparsely disseminated pyrite and arsenoprite...
ESTIMATION OF NAVIGATION - DAM DISCHARGE IN ILLINOIS.
Linda S. Weiss
1987, Conference Paper
Techniques were used to estimate discharge for the Brandon Road Dam on the Des Plaines River and the Dresden Island, Marseilles, and Starved Rock Dams on the Illinois River in northern Illinois. Tainter gates are operated to regulate streamflow at all dams. Additionally, headgates are used for regulation of the...
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...
Diffusivity of a glacial-outwash aquifer by the floodwave- response technique
R.J. Reynolds
1987, Groundwater (25) 290-299
Aquifer diffusivity (transmissivity divided by storage coefficient) was calculated for three sites in a glacial-autwash valley aquifer near Cortland, New York from water-level fluctuations induced by rises in stream stage. The observed response data were analyzed through use of a one-dimensional floodwave-response model to calculate the theoretical head response in...
Localized sudden changes in the geomagnetic secular variation.
L.R. Alldredge
1987, Journal of Geomagnetism & Geoelectricity (39) 111-118
There is much debate as to whether there was a worldwide geomagnetic jerk in 1969 or 1970. It is agreed that there was an unusual sharp change in the secular variation in the east component, Y, in Europe at that time. This note points out how a localized sudden change...
Stratigraphic framework and coal resources of the Upper Cretaceous Blackhawk Formation in the Ferron Canyon and Rock Canyon areas of the Wasatch Plateau coal field, Manti 30' x 60' Quadrangle, Emery and Sanpete counties, Utah
J. D. Sanchez, Terrence L. Brown
1987, Coal Map 94-B
No abstract available. ...
Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications
F.M. Lewis, Clifford I. Voss, J. Rubin
1987, Journal of Hydrology (90) 81-115
Methodologies that account for specific types of chemical reactions in the simulation of solute transport can be developed so they are compatible with solution algorithms employed in existing transport codes. This enables the simulation of reactive transport in complex multidimensional flow regimes, and provides a means for existing codes to...
Solubility and stability of scorodite, FeAsO4.2H2O: Discussion
D. Kirk Nordstrom, George A. Parks
1987, American Mineralogist (72) 849-851
Reported solubility data for a synthetic scorodite and the techniques used to prepare the synthetic phase are questioned. (A.M. 70-838, 72-852)-J.A.Z....
Regional heat flow variations in the northern Michigan and Lake Superior region determined using the silica heat flow estimator
R. Vugrinovich
1987, Journal of Volcanology and Geothermal Research (34) 15-24
Conventional heat flow data are sparse for northern Michigan. The groundwater silica heat flow estimator expands the database sufficiently to allow regional variations in heat flow to be examined. Heat flow shows a pattern of alternating highs and lows trending ESE across the Upper Peninsula and Lake Superior. The informal...
Large-scale volcano-ground ice interactions on Mars
S. W. Squyres, D.E. Wilhelms, A.C. Moosman
1987, Icarus (70) 385-408
The process of volcano-ground ice interaction on Mars is investigated by thermodynamic calculations and observations of Viking Orbiter images. We develop a numerical model of volcano-ground ice interaction that includes heat transport by conduction, radiation from the surface, heat transfer to the...
Marine and nonmarine gas-bearing rocks in Upper Cretaceous Blackhawk and Neslen Formations, eastern Uinta Basin, Utah: Sedimentology, diagenesis, and source rock potential
Janet K. Pitman, Karen J. Franczyk, Donald E. Anders
1987, American Association of Petroleum Geologists Bulletin (71) 76-94
The Upper Cretaceous Blackhawk and Neslen Formations in the eastern Uinta basin contain large amounts of thermogenic gas that was generated from interbedded humic-rich source rocks. The geometry and distribution of hydrocarbon source and reservoir rocks are controlled by depositional environment. The Blackhawk, composed of laterally extensive sandstone and locally...
US GEOLOGICAL SURVEY'S NATIONAL SYSTEM FOR PROCESSING AND DISTRIBUTION OF NEAR REAL-TIME HYDROLOGICAL DATA.
William G. Shope Jr.
Rodda J.C.Matalas N.C., editor(s)
1987, Conference Paper, IAHS Publication (International Association of Hydrological Sciences)
The US Geological Survey is utilizing a national network of more than 1000 satellite data-collection stations, four satellite-relay direct-readout ground stations, and more than 50 computers linked together in a private telecommunications network to acquire, process, and distribute hydrological data in near real-time. The four Survey offices operating a satellite...
Inter-laboratory comparison of X-ray fluorescence analyses of eruptive products of El Chichón Volcano, Chiapas, Mexico
Robert I. Tilling, Theodore J. Bornhorst, Joseph E. Taggart Jr., William I. Rose Jr., James J. McGee
1987, Applied Geochemistry (2) 337-345
An inter-laboratory comparison has been made of X-ray fluorescence analyses of 10 samples of lava and pumices from El Chichón Volcano, Chiapas, Mexico. Some determinations of major-element constituents agree within analytical uncertainty, whereas others exchibit significant bias. Analyses carried out at the Michigan Technological University (MTU) laboratory are systematically lower in MgO...
Creosote compounds in snails obtained from Pensacola Bay, Florida, near an onshore hazardous-waste site
Colleen E. Rostad, W. E. Pereira
1987, Chemosphere (16) 2397-2404
Snails, Thais haemostoma, were collected from two areas offshore in Pensacola Bay, Florida, near an onshore hazardous-waste site. Tissue from the snails was extracted to isolate the lipophilic compounds and analyzed by gas chromatography/mass spectrometry. Along with naturally occurring compounds, the snail tissue contained large concentrations of polycyclic aromatic compounds,...
Higher resolution satellite remote sensing and the impact on image mapping
Allen H. Watkins, June M. Thormodsgard
1987, Acta Astronautica (16) 221-232
Recent advances in spatial, spectral, and temporal resolution of civil land remote sensing satellite data are presenting new opportunities for image mapping applications. The U.S. Geological Survey's experimental satellite image mapping program is evolving toward larger scale image map products with increased information content as a result of improved image...
Determination of the rare-earth elements in geological materials by inductively coupled plasma mass spectrometry
F.E. Lichte, Allen L. Meier, James G. Crock
1987, Analytical Chemistry (59) 1150-1157
A method of analysis of geological materials for the determination of the rare-earth elements using the Inductively coupled plasma mass spectrometric technique (ICP-MS) has been developed. Instrumental parameters and factors affecting analytical results have been first studied and then optimized. Samples are analyzed directly following an acid digestion, without the...
Composition of fluid inclusions in Permian salt beds, Palo Duro Basin, Texas, U.S.A.
E. Roedder, W. M. d’Angelo, A. F. Dorrzapf Jr., P. J. Aruscavage
1987, Chemical Geology (61) 79-90
Several methods have been developed and used to extract and chemically analyze the two major types of fluid inclusions in bedded salt from the Palo Duro Basin, Texas. Data on the ratio K: Ca: Mg were obtained on a few of the clouds of tiny inclusions in "chevron" salt, representing...
Concentration and flux of solutes from snow and forest floor during snowmelt in the West-Central Adirondack region of New York
C.M. Rascher, C. T. Driscoll, N.E. Peters
1987, Biogeochemistry (3) 209-224
Decreases in pH and increases in the concentration of Al and NO3- have been observed in surface waters draining acid-sensitive regions in the northeastern U.S. during spring snowmelt. To assess the source of this acidity, we evaluated solute concentrations in snowpack, and in meltwater collected from snow and forest floor...
Unusual bed forms on the North Aleutian Shelf, Bristol Bay, Alaska
W. C. Schwab, B. F. Molnia
1987, Geo-Marine Letters (7) 207-215
Side-scan sonar records collected over an area of the North Aleutian Shelf, approximately 250 km west of the head of Bristol Bay, Alaska, identified widespread evidence of active sea floor erosion processes, including sediment transport. Thousands of sea floor depressions, many linear and some containing rippled floors, were identified in...
Partitioning potential fish yields from the Great Lakes
D.H. Loftus, C.H. Olver, Edward H. Brown, P.J. Colby, Wilbur L. Hartman, D.H. Schupp
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 417-424
We proposed and implemented procedures for partitioning future fish yields from the Great Lakes into taxonomic components. These projections are intended as guidelines for Great Lakes resource managers and scientists. Attainment of projected yields depends on restoration of stable fish communities containing some large piscivores that will use prey efficiently,...
Generalized potentiometric surface of the Sparta-Memphis aquifer, eastern Arkansas, spring 1980
D. J. Ackerman
1987, Water-Resources Investigations Report 87-4282
A map shows generalized contours of the altitude of water levels for wells completed in the Sparta-Memphis aquifer in eastern Arkansas. Most water-level measurements used in constructing the map were from the spring of 1980, but supplemental measurements from other years indicated no long-term change in water levels. Hydrographs for...
