Pyrolysis-mass spectrometry/pattern recognition on a well-characterized suite of humic samples
P. MacCarthy, S.J. DeLuca, K.J. Voorhees, Ronald L. Malcolm, E.M. Thurman
1985, Geochimica et Cosmochimica Acta (49) 2091-2096
A suite of well-characterized humic and fulvic acids of freshwater, soil and plant origin was subjected to pyrolysis-mass spectrometry and the resulting data were analyzed by pattern recognition and factor analysis. A factor analysis plot of the data shows that the humic acids and fulvic acids can be segregated into...
Time scales of circulation and mixing processes of San Francisco Bay waters
R. A. Walters, R. T. Cheng, T. J. Conomos
1985, Hydrobiologia (129) 13-36
Conceptual models for tidal period and low-frequency variations in sea level, currents, and mixing processes in the northern and southern reaches of San Francisco Bay describe the contrasting characteristics and dissimilar processes and rates in these embayments: The northern reach is a partially mixed estuary whereas the southern reach...
Selected characteristics of limestone and dolomite reservoirs in the United States
James W. Schmoker, Katherine B. Krystinik, Robert B. Halley
1985, American Association of Petroleum Geologists Bulletin (69) 733-741
Data from the United States Oil and Gas File (TOTL) developed by the University of Oklahoma, Norman, Oklahoma, are used to characterize the lithology, location (state and basin), geologic age, year of discovery, depth to top of pay, porosity, permeability, water saturation, volume of crude oil and nonassociated gas originally...
Statistical evaluation of an inductively coupled plasma atomic emission spectrometric method for routine water quality testing
J.R. Garbarino, B. E. Jones, G.P. Stein
1985, Applied Spectroscopy (39) 535-541
In an interlaboratory test, inductively coupled plasma atomic emission spectrometry (ICP-AES) was compared with flame atomic absorption spectrometry and molecular absorption spectrophotometry for the determination of 17 major and trace elements in 100 filtered natural water samples. No unacceptable biases were detected. The analysis precision of ICP-AES was found to...
A procedure for estimating Bacillus cereus spores in soil and stream-sediment samples — A potential exploration technique
J.R. Watterson
1985, Journal of Geochemical Exploration (23) 243-252
The presence of bacterial spores of the Bacillus cereus group in soils and stream sediments appears to be a sensitive indicator of several types of concealed mineral deposits, including vein-type gold deposits. The B. cereus assay is rapid, inexpensive, and inherently reproducible. The test, currently under investigation for its potential in mineral...
Geochemistry: Uses for synthetic fluid inclusions in quartz crystals
E. Roedder
1985, Nature (315) 544-545
[No abstract available]...
The effect of glaciers on streamflow variations
Andrew G. Fountain, Wendell V. Tangborn
1985, Water Resources Research (21) 579-586
The effect of temperate glaciers on runoff variations is examined for the North Cascade Mountains of Washington State. The principal influences of glaciers on streamflow are often unexpected contributions to streamflow volume, a delay of the maximum seasonal flow, and a decrease in annual and monthly variation of runoff. The...
The Schwartzwalder uranium deposit. I: Geology and structural controls on mineralization.
A. R. Wallace, R. C. Karlson
1985, Economic Geology (80) 1842-1857
Numerous uranium veins occupy fractures and faults in brittle Proterozoic gneisses along the east central Front Range of Colorado. The deposit size correlates with the density and localization of brittle fracture. The largest deposit, the Schwartzwalder, is explained by a singular configuration of complexly broken, deep-reaching brittle gneisses between impervious...
COMPARISON OF RECORDING CURRENT METERS USED FOR MEASURING VELOCITIES IN SHALLOW WATERS OF SAN FRANCISCO BAY, CALIFORNIA.
Jeffrey W. Gartner, Richard N. Oltmann
1985, Conference Paper, Oceans Conference Record (IEEE)
The authors determine the feasibility of collecting reliable current-meter data in shallow water under natural conditions. The study involved field testing four types of recording current meters (different speed sensors) and comparing data recorded by the meters under different field conditions. Speeds recorded by the current meters at slack water...
Movement of volatile organics through a fractured rock aquifer
S.E. Spayd
1985, Groundwater (23) 496-502
In response to the detection of contaminants in several municipal water supply wells in a northern New Jersey community, the New Jersey Department of Environmental Protection (NJDEP) undertook a detailed assessment of the movement of volatile organics through the Brunswick fractured rock aquifer. Understanding the...
GEOLOGIC ASPECTS OF TIGHT GAS RESERVOIRS IN THE ROCKY MOUNTAIN REGION.
Charles W. Spencer
1985, JPT, Journal of Petroleum Technology (37) 1308-1314
The authors describe some geologic characteristics of tight gas reservoirs in the Rocky Mountain region. These reservoirs usually have an in-situ permeability to gas of 0. 1 md or less and can be classified into four general geologic and engineering categories: (1) marginal marine blanket, (2) lenticular, (3) chalk, and...
Reduction of hexavalent chromium in water samples acidified for preservation
Kenneth G. Stollenwerk, D.B. Grove
1985, Journal of Environmental Quality (14) 396-399
Reduction of hexavalent chromium, Cr(VI), in water samples, preserved by standard techniques, was investigated. The standard preservation technique for water samples that are to be analyzed for Cr(VI) consists of filtration through a 0.45‐µm membrane, acidification to a pH < 2, and storage in plastic bottles. Batch...
Topographic mapping of the Moon
S.S.C. Wu
1985, Earth, Moon and Planets (32) 165-172
Contour maps of the Moon have been compiled by photogrammetric methods that use stereoscopic combinations of all available metric photographs from the Apollo 15, 16, and 17 missions. The maps utilize the same format as the existing NASA shaded-relief Lunar Planning Charts (LOC-1, -2, -3, and -4), which have a...
Error bounds in cascading regressions
M.R. Karlinger, B.M. Troutman
1985, Journal of the International Association for Mathematical Geology (17) 287-295
Cascading regressions is a technique for predicting a value of a dependent variable when no paired measurements exist to perform a standard regression analysis. Biases in coefficients of a cascaded-regression line as well as error variance of points about the line are functions of the correlation coefficient between dependent and...
Determination of elastic wave velocity and relative hypocenter locations using refracted waves. I. Methodology
Kaye M. Shedlock, Lucile M. Jones, Xiufang Ma
1985, Bulletin of the Seismological Society of America (75) 427-439
An arrival time difference method utilizing refracted arrivals from earthquakes in a homogeneous, layered earth model has been developed for the simultaneous determination of near-source (in situ) velocity and relative locations of earthquakes. The method is particularly applicable when analyzing data from arrays in which most of the recording stations...
Chemistry of thermal and nonthermal springs in the vicinity of Lassen Volcanic National Park
J. M. Thompson
1985, Journal of Volcanology and Geothermal Research (25) 81-104
Meaningful applications of water geothermometry to thermal springs in and around Lassen Volcanic National Park (LVNP) are limited to Growler Hot Spring and Morgan Hot Springs. Most hot springs located within LVNP are low-chloride, acid-sulfate waters associated with nearby steam vents. This type of hot-spring activity is characteristically found above...
Determination of interstitial chloride in shales and consolidated rocks by a precision leaching technique
Frank T. Manheim, E.E. Peck, Candice M. Lane
1985, Society of Petroleum Engineers journal (25) 704-710
We have devised a technique for determining chloride in interstitial water of consolidated rocks. Samples of rocks ranging from 5 to 10 g are crushed and sieved under controlled conditions and then ground with distilled water to submicron size in a closed mechanical mill. After ultra-centrifugation, chloride content is determined...
Engineering-geology site appraisal of the Federal Capital Territory, Nigeria
J. R. Ege, W. R. Griffitts, W.C. Overstreet
1985, Bulletin of the International Association of Engineering Geology (31) 71-79
The 7,700-km2-area Federal Capital Territory, Nigeria, is underlain by crystalline igneous and metamorphic rocks of Precambrian age. Sandstone and claystone of Cretaceous age overlie Precambrian rocks in the southwestern part of the Territory. Laterite caps many hills of Cretaceous rock, some hills of Precambrian rock, and crops out near stream...
Experimental chemical weathering of various bedrock types at different pH-values. 1. Sandstone and granite
A.A. Afifi, O.P. Bricker, J.C. Chemerys
1985, Chemical Geology (49) 87-113
Experimental chemical weathering of the so-called Old Rag Granite and Massanutten Sandstone, Virginia, U.S.A., has produced a comparison with the natural environment, and prediction of the effect of acid precipitation. The experimental results of the release of elements, dissolution of minerals, total rock weathered and the degree of weathering...
Compositional and mineralogic constraints on the genesis of ophiolite hosted nickel mineralization in the Pevkos area, Limassol Forest, Cyprus
M. P. Foose, M. Economou, A. Panayiotou
1985, Mineralium Deposita (20) 234-240
Mineralization composed dominantly of primary troilite, maucherite, pentlandite, and chalcopyrite, and secondary valleriite occurs in serpentinized transition zone rocks of the Limasol Forest segment of the Troodos ophiolite complex, Cyprus. Whole-rock and electron microprobe analyses of this mineralization gives ranges of Cu/(Cu+Ni)=0.16 to 0.47, Pt/(Pt+Pd)=0.66 to 0.51, Ni/Co=6.33 to 13.4,...
Linear inversion of transmitted acoustic wave fields for three-dimensional modulus and density perturbations using a born-type approximation
Douglas A. Stauber
1985, Bulletin of the Seismological Society of America (75) 93-114
A Born approximation is used to linearize the relationship, in the horizontal-wavenumber and frequency domains, between lateral perturbations of modulus and density in a layered half-space and the acoustic wave field observed at the surface when a plane wave is incident from below. The resulting equations can be used to...
PROCEDURES FOR ACCURATE PRODUCTION OF COLOR IMAGES FROM SATELLITE OR AIRCRAFT MULTISPECTRAL DIGITAL DATA.
Joseph S. Duval
1985, Journal of Imaging Technology (10) 16-22
Because the display and interpretation of satellite and aircraft remote-sensing data make extensive use of color film products, accurate reproduction of the color images is important. To achieve accurate color reproduction, the exposure and chemical processing of the film must be monitored and controlled. By using a combination of sensitometry,...
Crustal structure of the southern Calaveras fault zone, central California, from seismic refraction investigations
Peter Blumling, Walter D. Mooney, William H. K. Lee
1985, Bulletin of the Seismological Society of America (75) 193-209
A magnitude 5.7 earthquake on 6 August 1979, within the Calaveras fault zone, near Coyote Lake of west-central California, motivated a seismic-refraction investigation in this area. A northwest-southeast profile along the fault, as well as two fan profiles across the fault were recorded to examine the velocity structure of this...
A seismic-refraction profile across the San Andreas, Sargent, and Calaveras faults, west-central California
Walter D. Mooney, Robert H. Colburn
1985, Bulletin of the Seismological Society of America (75) 175-191
In 1981, the United States Geological Survey recorded a seismic-refraction profile across the southern Santa Cruz Mountains in west-central California to examine the shallow velocity structure of this seismogenic region. This 40-km-long profile, which consisted of three shotpoints, extended northeastward from near Watsonville, California, to Coyote Lake, crossing the San...
Benthic fluxes in San Francisco Bay
Douglas E. Hammond, C. Fuller, D. Harmon, Blayne Hartman, M. Korosec, L.G. Miller, R. Rea, S. Warren, W. Berelson, S.W. Hager
1985, Hydrobiologia (129) 69-90
Measurements of benthic fluxes have been made on four occasions between February 1980 and February 1981 at a channel station and a shoal station in South San Francisco Bay, using in situ flux chambers. On each occasion replicate measurements of easily measured substances such as radon, oxygen, ammonia, and silica...
