Geochemical processes in the Gascoyne Lignite Mining Area, Bowman County, North Dakota
D. W. Fisher, D. C. Thorstenson, M. G. Croft, R. L. Houghton
1985, Water-Resources Investigations Report 84-4192
NoticeThe publication has been withdrawn because it contained errors or contained information that could not be verified for accuracy....
In situ calibration of a high-resolution gamma-ray borehole sonde for assaying uranium-bearing sandstone deposits
J.H. Day Jr.
1985, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (234) 205-211
A method is presented for assaying radioactive sandstone deposits in situ by using a high-resolution borehole gamma-ray spectrometer. Gamma-ray photopeaks from the same spectrum acquired to analyze a sample are used to characterize gamma-ray attenuation properties, from which a calibration function is determined. Assay results are independent of differences between...
New approach to calibrating bed load samplers
D. W. Hubbell, H.H. Stevens, J. V. Skinner, J.P. Beverage
1985, Journal of Hydraulic Engineering (111) 677-694
Cyclic variations in bed load discharge at a point, which are an inherent part of the process of bed load movement, complicate calibration of bed load samplers and preclude the use of average rates to define sampling efficiencies. Calibration curves, rather than efficiencies, are derived by two independent methods using...
A heat-flow reconnaissance of southeastern Alaska
J.H. Sass, L.A. Lawver, R. J. Munroe
1985, Canadian Journal of Earth Sciences (22) 416-421
Heat flow was measured at nine sites in crystalline and sedimentary rocks of southeastern Alaska. Seven of the sites, located between 115 and 155 km landward of the Queen Charlotte – Fairweather transform fault, have an average heat flow of 59 ± 6 mW m−2. This value is significantly higher than the mean of 42 mW m−2 in...
Geology of the surficial aquifer system Broward County, Florida: Lithologic logs
C. R. Causaras
1985, Water-Resources Investigations Report 84-4068
The geologic framework of the surficial aquifer system, of which the Biscayne aquifer is the major component in Broward County, Florida, is presented in eight geologic cross sections. The cross sections are based on detailed lithologic logs of 27 test wells that were drilled, in the summer of 1981, through...
Empirical estimates of cumulative refraction errors associated with procedurally constrained levelings based on the Gaithersburg- Tucson refraction tests of the National Geodetic Survey
R. O. Castle, T.D. Gilmore, R. K. Mark, R.H. Shaw
1985, Geophysical Research Letters (12) 239-242
Analyses of results of the National Geodetic Survey's leveling refraction tests indicate that the standard deviation about the mean (σ) for high-scale minus low-scale rod readings closely correlates with measured refraction error. Use of this relation in conjunction with values for σ obtained from routinely constrained...
Active tectonic and magmatic processes beneath Long Valley Caldera, eastern California: An overview
D.P. Hill, R. A. Bailey, A.S. Ryall
1985, Journal of Geophysical Research Solid Earth (90) 11111-11120
Geological, chronological, and structural studies of the Long Valley-Mono/Inyo Craters area document a long history of related volcanic eruptions and earthquakes controlled by regional extensional tectonics of the Basin and Range province. This activity has persisted for hundreds of thousands of years and is likely to continue. The Long Valley...
Compilation of hydrologic data for the Edwards Aquifer, San Antonio area, Texas, 1982, with 1934-82 summary
R.D. Reeves, G. B. Ozuna
1985, Edwards Underground Water District Bulletin 42
No abstract available....
PROGRESS REPORT ON GEOLOGIC STUDIES OF THE RANGER OREBODIES, NORTHERN TERRITORY, AUSTRALIA.
J. Thomas Nash, David Frishman
Sibbald T.I.I.Petruk William, editor(s)
1985, Conference Paper, CIM Special Volume
The Ranger No. 1 and No. 3 orebodies contain about 124,000 tonnes U//3O//8 in highly chloritized metasediments of the lower Proterozoic Cahill Formation within about 500 m of the projected sub-Kombolgie Formation unconformity. In both orebodies, oxidized and reduced uranium minerals occur chiefly in quartzose schists that have highly variable...
Stable-isotope evidence for a magmatic component in fumarole condensates from Augustine Volcano, Cook Inlet, Alaska, U.S.A.
J.A. Viglino, R.S. Harmon, J. Borthwick, N.L. Nehring, R.J. Motyka, L. D. White, D. A. Johnston
1985, Chemical Geology (49) 141-157
D/H and 18O 16O ratios have been determined for fumarole condensates from Augustine Volcano, an active calc-alkaline stratovolcano in Lower Cook Inlet, Alaska. The isotopic data for the condensates form a linear ?? D-?? 18O array from low-temperature fluids (< 100??C) which are essentially local meteoric water (?? D...
Cleavage strain in the Variscan fold belt, County Cork, Ireland, estimated from stretched arsenopyrite rosettes
M. Ford, C.C. Ferguson
1985, Journal of Structural Geology (7) 217-223
In south-west Ireland, hydrothermally formed arsenopyrite crystals in a Devonian mudstone have responded to Variscan deformation by brittle extension fracture and fragment separation. The interfragment gaps and terminal extension zones of each crystal are infilled with fibrous quartz. Stretches within the...
Genesis and evolution of water in a two-mica pluton: A hydrogen isotope study
R. H. Brigham, J. R. O’Neil
1985, Chemical Geology (49) 159-177
Measurements were made of the hydrogen isotope composition of 74 samples of muscovite, biotite, vein quartz and whole rocks from the Papoose Flat pluton, eastern California, U.S.A., and adjacent metamorphic and sedimentary rocks in order to elucidate the genesis and evolution of water and hydrous minerals in a two-mica granodiorite....
THREE-COMPONENT BOREHOLE MAGNETOMETER PROBE FOR MINERAL INVESTIGATIONS AND GEOLOGIC RESEARCH.
James H. Scott, Gary G. Olson
1985, Conference Paper, Transactions of the SPWLA Annual Logging Symposium (Society of Professional Well Log Analysts)
A small-diameter three-component fluxgate magnetometer probe with gyroscopic and inclinometer orientation has been developed to meet U. S. Geological Survey design and performance specifications for measurement of the direction and intensity of the Earth's magnetic field in vertical and inclined boreholes. The orthogonal fluxgate magnetometer elements have a measurement resolution...
Recognition of interstitial anhydrite dissolution: A cause of secondary porosity, San Andres limestone, New Mexico, and Upper Minnelusa Formation, Wyoming
Christopher J. Schenk, Randall W. Richardson
1985, American Association of Petroleum Geologists Bulletin (69) 1064-1076
Rectangular and stair-step pore reentrants in carbonate mudstones have been recognized previously as indirect evidence for anhydrite dissolution. In this study, direct evidence for subsurface dissolution of interstitial anhydrite in both dolomite grainstones and quartz sandstones includes: (1) cleavage-related dissolution fringe on anhydrite crystal surfaces, and (2) isolated remnants of...
Deformation near the epicenter of the 1984 Round Valley, California, earthquake
W.K. Gross, J.C. Savage
1985, Bulletin of the Seismological Society of America (75) 1339-1347
A trilateration network extending from near Mammoth Lakes to Bishop, California, was resurveyed following the 23 November 1984, Round Valley earthquake (ML = 5.8). The network had previously been surveyed in 1982. Deformation apparently associated with the Round Valley earthquake was detected as well as deformation due to the expansion...
Comparison of marine gas hydrates in sediments of an active and passive continental margin
K.A. Kvenvolden
1985, Marine and Petroleum Geology (2) 65-71
Two sites of the Deep Sea Drilling Project in contrasting geologic settings provide a basis for comparison of the geochemical conditions associated with marine gas hydrates in continental margin sediments. Site 533 is located at 3191 m water depth on a spit-like extension of the continental rise on a passive...
Summary of data on the age of the Orca Group, Alaska: A section in The United States Geological Survey in Alaska: Accomplishments during 1984
George Plafker, Gerta Keller, Steven W. Nelson, Julie A. Dumoulin, Marti L. Miller
1985, Circular 967
The Orca Group is a widespread, thick, complexly deformed accretionary sequence of flysch and tholeiitic basalt in the Prince William Sound area (Winkler, 1976; Winkler and Plafker, 1981) (fig. 49). Despite a number of extensive field studies of the Orca Group, reliable data on the age of the unit have...
A geophysical and geological study of Laguna de Ayarza, a Guatemalan caldera lake
L.J. Poppe, C. K. Paull, C. G. Newhall, J.P. Bradbury, J. Ziagos
1985, Journal of Volcanology and Geothermal Research (25) 125-144
Geologic and geophysical data from Laguna de Ayarza, a figure-8-shaped doublecaldera lake in the Guatemalan highlands, show no evidence of postcaldera eruptive tectonic activity. The bathymetry of the lake has evolved as a result of sedimentary infilling. The western caldera is steep-sided and contains a large flat-floored central basin 240...
Harmonic analysis of tides and tidal currents in South San Francisco Bay, California
R. T. Cheng, J. W. Gartner
1985, Estuarine, Coastal and Shelf Science (21) 57-74
Water level observations from tide stations and current observations from current-meter moorings in South San Francisco Bay (South Bay), California have been harmonically analysed. At each tide station, 13 harmonic constituents have been computed by a least-squares regression without inference. Tides in South Bay are typically mixed; there is a...
Geochemistry of Great Salt Lake, Utah I: Hydrochemistry since 1850
R. J. Spencer, H.P. Eugster, B.F. Jones, S.L. Rettig
1985, Geochimica et Cosmochimica Acta (49) 727-737
The hydrochemistry of Great Salt Lake, Utah, has been defined for the historic period, 1850 through 1982, from published data combined with new observations. The water balance depends largely on river inflow, atmospheric precipitation onto the lake surface and evaporation. Input of the major solutes can best be accounted for...
Subtidal sea level and current variations in the northern reach of San Francisco Bay
R. A. Walters, J. W. Gartner
1985, Estuarine, Coastal and Shelf Science (21) 17-32
Analyses of sea level and current-meter data using digital filters and a variety of statistical methods show a variety of phenomena related to non-local coastal forcing and local tidal forcing in the northern reach of San Francisco Bay, a partially mixed estuary. Low-frequency variations in sea level are dominated by...
Evaluation and use of a diffusion-controlled sampler for determining chemical and dissolved oxygen gradients at the sediment-water interface
N.S. Simon, M.M. Kennedy, C.S. Massoni
1985, Hydrobiologia (126) 135-141
Field and laboratory evaluations were made of a simple, inexpensive diffusion-controlled sampler with ports on two sides at each interval which incorporates 0.2-??m polycarbonate membrane to filter samples in situ. Monovalent and divalent ions reached 90% of equilibrium between sampler contents and the external solution within 3 and 6 hours,...
Distribution of volatile organic compounds in a New Jersey coastal plain aquifer system
T. V. Fusillo, J. J. Hochreiter Jr., D. G. Lord
1985, Groundwater (23) 354-359
Samples for analysis of volatile organic compounds were collected from 315 wells in the Potomac-Raritan-Magothy aquifer system in southwestern New Jersey and a small adjacent area in Pennsylvania during 1980–82. Volatile organic compounds were detected in all three aquifer units of the Potomac-Raritan-Magothy aquifer...
Unit hydrograph approximations assuming linear flow through topologically random channel networks
Brent M. Troutman, Michael R. Karlinger
1985, Water Resources Research (21) 743-754
The instantaneous unit Hydrograph (IUH) of a drainage basin is derived in terms of fundamental basin characteristics (Z, α, β), where α parameterizes the link (channel segment) length distribution, and β is a vector of hydraulic parameters, Z is one of three basin topological properties, N, (N, D), or (N, M), where N is magnitude (number of...
Terrestrial vs. marine depositional model—A new assessment of subsurface Lower Pennsylvanian rocks of southwestern Virginia
C. L. Rice
1985, Geology (13) 786-789
A reinterpretation of the origin of subsurface rocks in southwestern Virginia and southeastern Kentucky suggests that, contrary to commonly accepted ideas, the Mississippian-Pennsylvanian Systemic boundary is an unconformity and the Lower Pennsylvanian quartz arenite sequences were deposited in a fluvial environment. Because Pennsylvanian...
