Heat capacities and thermodynamic properties of annite (aluminous iron biotite)
B. S. Hemingway, R. A. Robie
1990, American Mineralogist (75) 183-187
The heat capacities have been measured between 7 and 650 K by quasi-adiabatic calorimetry and differential scanning calorimetry. At 298.15 K and 1 bar, the calorimetric entropy for our sample is 354.9??0.7 J/(mol.K). A minimum configurational entropy of 18.7 J/(mol.K) for full disorder of Al/Si in the tetrahedral sites should...
High-precision 40Ar/39Ar sanidine geochronology of ignimbrites in the Mogollon-Datil volcanic field, southwestern New Mexico
W. C. McIntosh, J. F. Sutter, C.E. Chapin, L.L. Kedzie
1990, Bulletin of Volcanology (52) 584-601
40Ar/39Ar age spectra have been obtained from 85 sanidine separates from 36 ignimbrites and one rhyolitic lava in the latest Eocene-Oligocene Mogollon-Datil volcanic field of southwestern New Mexico. Of the 97 measured age spectra, 94 yield weighted-mean plateau ages each giving single-spectrum 1?? precision of??0.25%-0.4% (??0.07-0.14 Ma). Replicate plateau age...
Effects of elevated temperatures and rising sea level on Arctic Coast
Peter W. Barnes
1990, Journal of Cold Regions Engineering (4) 21-28
Ice is a major agent on the inner shelf, gouging the bottom, increasing hydraulic scour, transporting sediment, and influencing river flood patterns. Rapid coastal retreat is common and low barrier islands and beaches are constantly changing due to the influence of permafrost, ice‐push, waves, and currents. Coastal processes are presently...
Geology and geochemistry of epithermal precious metal vein systems in the intra-oceanic arcs of Palau and Yap, western Pacific
J. J. Rytuba, W. R. Miller
1990, Journal of Geochemical Exploration (35) 413-447
The Palau and Yap arcs are part of an intra-oceanic island-arc-trench system which separates the Pacific and Philippine plates in the western Pacific Ocean. The 350-km-long Palau arc consists of over 200 islands while the 400-km-long Yap arc located to the north has only four major islands exposed. Four of...
Application of a hollow-fiber, tangential-flow device for sampling suspended bacteria and particles from natural waters
J.S. Kuwabara, R.W. Harvey
1990, Journal of Environmental Quality (19) 625-629
The design and application of a hollow-fiber tangential-flow filtration device has been used to concentrate bacteria and suspended particles from large volume surface water and groundwater samples (i.e., hundreds of liters). Filtrate tlux rates (4–8 L min−1) are equal to or faster than those of other devices that are based...
Vapor-phase interactions and diffusion of organic solvents in the unsaturated zone
William R. Roy, R. A. Griffin
1990, Environmental Geology and Water Sciences (15) 101-110
This article presents an analysis of the interactions and static movement of 37 organic solvents as vapors through the unsaturated soil zone. The physicochemical interactions of the organic vapors with unsaturated soil materials were emphasized with focus on diffusive, and adsorptive interactions. Fick's Law and porous media diffusion coefficients for...
Geographic information system as country-level development and monitoring tool, Senegal example
Donald G. Moore, Stephen M. Howard
Anon, editor(s)
1990, Conference Paper, Proceedings of the International Symposium on Remote Sensing of Environment
Geographic information systems (GIS) allow an investigator the capability to merge and analyze numerous types of country-level resource data. Hypothetical resource analysis applications in Senegal were conducted to illustrate the utility of a GIS for development planning and resource monitoring. Map and attribute data for soils, vegetation, population, infrastructure, and...
Ages of travertine deposits in eastern Grand Canyon National Park, Arizona
Barney J. Szabo
1990, Quaternary Research (34) 24-32
Travertine deposits in eastern Grand Canyon National Park, Arizona, are inferred to have formed under conditions of effective wetness that were greater than present. Uranium-series dating of 17 samples indicates that the deposits formed at about 15,000, 71,000, 111,000, 171,000, and 338,000 yr B.P. Intervals of travertine deposition are essentially...
A geochemical sampling technique for use in areas of active alpine glaciation: an application from the central Alaska Range
G.C. Stephens, E.B. Evenson, D.E. Detra
1990, Journal of Geochemical Exploration (37) 301-321
In mountainous regions containing extensive glacier systems there is a lack of suitable material for conventional geochemical sampling. As a result, in most geochemical sampling programs a few stream-sediment samples collected at, or near, the terminus of valley glaciers are used...
Flexure and faulting of sedimentary host rocks during growth of igneous domes, Henry Mountains, Utah
M.D. Jackson, D. D. Pollard
1990, Journal of Structural Geology (12) 185-206
A sequence of sedimentary rocks about 4 km thick was bent, stretched and uplifted during the growth of three igneous domes in the southern Henry Mountains. Mount Holmes, Mount Ellsworth and Mount Hillers are all about 12 km in diameter, but the amplitudes of their domes are about 1.2, 1.85...
Adsorption of selenium by amorphous iron oxyhydroxide and manganese dioxide
Laurie S. Balistrieri, T. T. Chao
1990, Geochimica et Cosmochimica Acta (54) 739-751
This work compares and models the adsorption of selenium and other anions on a neutral to alkaline surface (amorphous iron oxyhydroxide) and an acidic surface (manganese dioxide). Selenium adsorption on these oxides is examined as a function of pH, particle concentration, oxidation state, and competing anion concentration in order to...
Determination of the accuracy and operating constants in a digitally biased ring core magnetometer
A.W. Green Jr.
1990, Physics of the Earth and Planetary Interiors (59) 119-122
By using a very stable voltage reference and a high precision digital-to-analog converter to set bias in digital increments, the inherently high stability and accuracy of a ring core magnetometer can be significantly enhanced. In this case it becomes possible to measure not only variations about the bias level, but...
Seismic site effects and the spatial interpolation of earthquake seismograms: Results using aftershocks of the 1986 North Palm Springs, California, earthquake
P. Spudich, D.P. Miller
1990, Bulletin of the Seismological Society of America (80) 1504-1532
We address the following two questions. Can a microearthquake's ground motions be modeled by incident P and S waves that excite a site transfer-function that is a smooth function of incidence angle? Given recorded ground motions from a set of earthquakes having known locations and mechanisms, can we derive such...
Organic geochemical studies of the transformation of gymnospermous xylem during peatification and coalification to subbituminous coal
Patrick G. Hatcher, H. E. Lerch III, T.V. Verheyen
1990, International Journal of Coal Geology (16) 193-196
Organic geochemical investigations of peatified and coalified xylem from gymnosperms have provided useful information on the organic transformational processes collectively known as coalification. The combined use of solid-state 13C nuclear magnetic resonance (NMR) and pyrolysis/gas chromatography/mass spectrometry (py/gc/ms) has allowed us to...
Simulation of rockfalls triggered by earthquakes
Y. Kobayashi, E. L. Harp, T. Kagawa
1990, Rock Mechanics and Rock Engineering (23) 1-20
A computer program to simulate the downslope movement of boulders in rolling or bouncing modes has been developed and applied to actual rockfalls triggered by the Mammoth Lakes, California, earthquake sequence in 1980 and the Central Idaho earthquake in 1983. In order to reproduce a movement mode where bouncing predominated,...
The quantitative determination of FeS2 phases in coal by means of 57Fe Mössbauer spectroscopy
B.J. Evans, Hobart M. King, John J. Renton, A. Stiller
1990, Hyperfine Interactions (57) 2187-2193
A knowledge of the concentration of pyrite and marcasite in coals can provide important insight into the genesis of coal deposits. Determinations of the relative amounts of pyrite and marcasite by traditional methods of coal analysis are, however, beset with many difficulties. Using 57Fe Mössbauer spectroscopy and a mild chemical...
Radarclinometry of the Earth and Venus from space-shuttle and Venera-15 imagery
R.L. Wildey
1990, Earth, Moon and Planets (48) 197-231
The project to develop a line-integral approach to 2-dimensional radarclinometry and to bring it to the status of producing topographic maps from real radar images has been concluded. The final developments of the theory itself have involved a trial-and-error resolution of the curvature decision process at each integration step over...
Magnetic forward models of Cement oil field, Oklahoma, based on rock magnetic, geochemical, and petrologic constraints
R. L. Reynolds, M. Webring, V. J. S. Grauch, M. Tuttle
1990, Geophysics (55) 344-353
Magnetic forward models of the Cement oil field, Oklahoma, were generated to assess the possibility that ferrimagnetic pyrrhotite related to hydrocarbon seepage in the upper 1 km of Permian strata contributes to aeromagnetic anomalies at Cement. Six bodies having different magnetizations were constructed for the magnetic models, based on geology...
Source inversion of the 1988 Upland, California, earthquake: Determination of a fault plane for a small event
J. Mori, S. Hartzell
1990, Bulletin of the Seismological Society of America (80) 507-518
We examined short-period P waves to investigate if waveform data could be used to determine which of two nodal planes was the actual fault plane for a small (ML 4.6) earthquake near Upland, California. We removed path and site complications by choosing a small aftershock (ML 2.7) as an empirical...
Sediment movement along the U.S. east coast continental shelf-I. Estimates of bottom stress using the Grant-Madsen model and near-bottom wave and current measurements
V.D. Lyne, B. Butman, W.D. Grant
1990, Continental Shelf Research (10) 397-428
Bottom stress is calculated for several long-term time-series observations, made on the U.S. east coast continental shelf during winter, using the wave-current interaction and moveable bed models of Grant and Madsen (1979, Journal of Geophysical Research, 84, 1797-1808; 1982, Journal of Geophysical Research, 87, 469-482). The wave and current measurements...
Interpretation of Na-K-Mg relations in geothermal waters
R.O. Fournier
1990, Conference Paper, Transactions - Geothermal Resources Council
When using a Na-K-???Mg triangular diagram as an aid in the interpretation of a geothermal water, the estimated temperature of last water-rock equilibration may change by as much as 50??C, depending on which of the many Na/K geothermometers one assumes is correct. A particular geothermometer may work well in one...
The flaminio obelisk in Rome: vibrational characteristics as part of preservation efforts
G. Bongiovanni, M. Çelebi, P. Clemente
1990, Earthquake Engineering and Structural Dynamics (19) 107-118
The purpose of the paper is to study the vibrational characteristics of the Flaminio Obelisk in Rome as part of general studies being performed for preservation purposes. The state of preservation of the monument is described as well as the sonic method used to evaluate the integrity of the sections....
The relation of catastrophic flooding of Mangala Valles, Mars, to faulting of Memnonia Fossae and Tharsis volcanism
K. L. Tanaka, M. G. Chapman
1990, Journal of Geophysical Research Solid Earth (95) 14315-14323
Detailed stratigraphic relations indicate two coeval periods of catastrophic flooding and Tharsis centered faulting (producing Memnonia Fossae) in the Mangala Valles region of Mars. Major sequences of lava flows of the Tharsis Montes Formation and local, lobate plains flows were erupted during and between these channeling and faulting episodes. First,...
Early Holocene pecan, Carya illinoensis, in the Mississippi River Valley near Muscatine, Iowa
E. Arthur Bettis III, R. G. Baker, B.K. Nations, D.W. Benn
1990, Quaternary Research (33) 102-107
A fossil pecan, Carya illinoensis (Wang.) K. Koch, from floodplain sediments of the Mississippi River near Muscatine, Iowa, was accelerator-dated at 7280 ?? 120 yr B.P. This discovery indicates that pecan was at or near its present northern limit by that time. Carya pollen profiles from the Mississippi River Trench...
Oil-shale data, cores, and samples collected by the U.S. geological survey through 1989
John R. Dyni, Frances Gay, Thomas C. Michalski
Gary James H., editor(s)
1990, Conference Paper, Oil Shale Symposium Proceedings
The U.S. Geological Survey has acquired a large collection of geotechnical data, drill cores, and crushed samples of oil shale from the Eocene Green River Formation in Colorado, Wyoming, and Utah. The data include about 250,000 shale-oil analyses from about 600 core holes. Most of the data is from Colorado...
