Systematics of stretching of fluid inclusions; I. Fluorite and sphalerite at 1 atmosphere confining pressure
R.J. Bodnar, P. M. Bethke
1984, Economic Geology (79) 141-161
More than 1,300 measurements on fluid inclusions in fluorite and sphalerite indicate that stretching proceeds systematically and predictably. In order to generate internal pressures that are sufficiently high to cause stretching, most inclusions must be heated beyond their initial homogenization temperatures, i.e., overheated. The amount of overheating necessary to initiate...
New data for iimoriite.
E.E. Foord, M.H. Staatz, N. M. Conklin
1984, American Mineralogist (69) 196-199
In its first reported occurrence outside of Japan, iimoriite, Y2(SiO4)(CO3), has been found in a thorite- and uraninite-bearing quartz and albite vein from Bokan Mountain on Prince of Wales Island, Alaska. It occurs as buff-tan subhedral and anhedral grains, 0.01-0.5 mm in diameter, with vitreous lustre, white streak, and H....
Lead and strontium isotopic evidence for crustal interaction and compositional zonation in the source regions of Pleistocene basaltic and rhyolitic magmas of the Coso volcanic field, California
C. R. Bacon, H. Kurasawa, M.H. Delevaux, R. W. Kistler, B. R. Doe
1984, Contributions to Mineralogy and Petrology (85) 366-375
The isotopic compositions of Pb and Sr in Pleistocene basalt, high-silica rhyolite, and andesitic inclusions in rhyolite of the Coso volcanic field indicate that these rocks were derived from different levels of compositionally zoned magmatic systems. The 2 earliest rhyolites probably were tapped from short-lived silicic reservoirs, in contrast to...
Transitional paleointensities from Kauai, Hawaii, and geomagnetic reversal models
Scott W. Bogue, Robert S. Coe
1984, Journal of Geophysical Research (89) 10341-10354
Previously presented paleointensity results from an R-N transition zone in Kauai, Hawaii, show that field intensity dropped from 0. 431 Oe to 0. 101 Oe while the field remained within 30 degree of the reversed axial dipole direction. A recovery in intensity and the main directional change followed this presumably...
Pedimentation versus debris-flow origin of plateau-side desert terraces in southern Utah
V. S. Williams
1984, Journal of Geology (92) 457-468
Plateau-side terraces in arid areas around the world are commonly described as pediment remnants, although, in many cases, they may have been formed by debris-flow deposition. Pediments do exist in the area of the Aquarius and Kaiparowits Plateaus of southern Utah; however, many alluvial terraces that were classified by previous...
Isolation of organic acids from large volumes of water by adsorption chromatography
George R. Aiken
1984, Book, National Meeting - American Chemical Society, Division of Environmental Chemistry
The concentrations of dissolved organic carbon from most natural waters ranges from 1 to 20 milligrams carbon per liter, of which approximately 75 percent are organic acids. These acids can be chromatographically fractionated into hydrophobic organic acids, such as humic substances, and hydrophilic organic acids. To effectively study any of...
U-Th-Pb, Rb-Sr, and Ar-Ar mineral and whole-rock isotopic systematics in a metamorphosed granitic terrane, southeastern California
E. Dewitt, R.L. Armstrong, J. F. Sutter, R. E. Zartman
1984, Geological Society of America Bulletin (95) 723-739
Mesozoic structural domes are developed in an older Proterozoic crystalline basement of granitic to granodioritic foliate metaplutonic rocks in the Halloran Hills, southeastern California. Isotopic analyses of whole rocks and mineral separates from these rocks by U-Th-Pb, Rb-Sr, and Ar-Ar techniques yield a...
Botanical and geological significance of potassium-argon dates from the Juan Fernández Islands
Tod F. Stuessy, K.A. Foland, John F. Sutter, Roger W. Sanders, O. Mario Silva
1984, Science (225) 49-51
Potassium-argon dating of five basalts from the three main islands of the Juan Fernández (or Robinson Crusoe) Islands of Chile in the southeastern Pacific gives ages of 1.01 ± 0.12 and 2.44 ± 0.14 million years for Masafuera, 3.79 ± 0.20 and 4.23 ± 0.16 for Masatierra, and 5.8 ±...
Volcanic glasses, their origins and alteration processes
I. Friedman, W. Long
1984, Journal of Non-Crystalline Solids (67) 127-133
Natural glass can be formed by volcanic processes, lightning (fulgarites) burning coal, and by meteorite impact. By far the most common process is volcanic - basically the glass is rapidly chilled molten rock. All natural glasses are thermodynamically unstable and tend to alter chemically or to crystallize. The rate of...
Moho orientation beneath central California from regional earthquake travel times
David H. Oppenheimer, Jerry P. Eaton
1984, Journal of Geophysical Research (89) 10267-10282
This paper examines relative Pn arrival times, recorded by the U. S. Geological Survey seismic network in central and northern California from an azimuthally distributed set of regional earthquakes. Improved estimates are presented of upper mantle velocities in the Coast Ranges, Great Valley, and Sierra Nevada foothills and estimates of...
Gas chromatographic analysis of volatiles in fluid and gas inclusions
F. Andrawes, G. Holzer, E. Roedder, E.K. Gibson Jr., John Oro
1984, Journal of Chromatography A (302) 181-193
Most geological samples and some synthetic materials contain fluid inclusions. These inclusions preserve for us tiny samples of the liquid and/or the gas phase that was present during formation, although in some cases they may have undergone significant changes from the original material. Studies of the current composition of the...
The complex variable boundary element method: Applications in determining approximative boundaries
T. V. Hromadka II
1984, Engineering Analysis (1) 218-222
The complex variable boundary element method (CVBEM) is used to determine approximation functions for boundary value problems of the Laplace equation such as occurs in potential theory. By determining an approximative boundary upon which the CVBEM approximator matches the desired constant (level curves) boundary conditions, the CVBEM is found to...
Geochemical data for samples of rock, stream sediment, and nonmagnetic heavy-mineral concentrate from the Tunnel Ridge Wilderness Study Area, Klamath Mountains, California
M. F. Diggles, G. L. Kennedy, D.E. Detra, J. D. Sharkey
1984, Open-File Report 84-887
No abstract available....
A comparison of iron oxide-rich joint coatings and rock chips as geochemical sampling media in exploration for disseminated gold deposits
W. Crone, L.T. Larson, R.H. Carpenter, T. T. Chao, R. F. Sanzolone
1984, Journal of Geochemical Exploration (20) 161-178
We evaluated the effectiveness of iron oxide-rich fracture coatings as a geochemical sampling medium for disseminated gold deposits, as compared with conventional lithogeochemical methods, for samples from the Pinson mine and Preble prospect in southeastern Humboldt County, Nevada. That disseminated gold mineralization is associated with Hg, As, and Sb is...
Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California
R. S. U. Smith, W. E. Yeend, J. C. Dohrenwend, D. D. Gese
1984, Open-File Report 84-630
No abstract available....
The toxicity of chlorine to a common vascular aquatic plant
C.H. Watkins, R.S. Hammerschlag
1984, Water Research (18) 1037-1043
Myriophyllum spicatum was exposed to various chlorine concentrations on a continuous and intermittent basis in 96-h toxicity studies utilizing a proportional diluter. Continuous exposure to chlorine concentrations as low as 0.05 mg l−1 total residual chlorine (TRC) depressed shoot and total plant dry weights approx. 30% relative to controls. Shoot length was...
Oxygen isotope calibration of the onset of ice-rafting and history of glaciation in the North Atlantic region
N. J. Shackleton, J. Backman, H. Zimmerman, D.V. Kent, M.A. Hall, David G. Roberts, D. Schnitker, J.G. Baldauf, A. Desprairies, R. Homrighausen, P. Huddlestun, J.B. Keene, A.J. Kaltenback, K.A.O. Krumsiek, A.C. Morton, J.W. Murray, J. Westberg-Smith
1984, Nature (307) 620-623
We report here that DSDP Site 552A, cored with the hydraulic piston corer on the west flank of Rockall Bank, recovered an undisturbed sequence of alternating white deep-sea carbonate oozes and dark-coloured layers that are rich in glacial debris. Oxygen isotope analysis of the sequence together with detailed nannofossil and...
USGS adopts revised criteria and terms for hazards notices
D. Finley
1984, Earthquake Information Bulletin (USGS) (16) 190-190
Causes of acidification of four streams on Laurel Hilld in southwestern Pennsylvania
William E. Sharpe, David R. DeWalle, Robert T. Leibfried, Richard S. Dinicola, William G. Kimmel, Lysle S. Sherwin
1984, Journal of Environmental Quality (13) 619-631
Atmospheric deposition, soils developed from bedrock, a natural bog, gas wells, and a ski area were all investigated as possible sources of water quality degradation for four streams on Laurel Hill in southwestern Pennsylvania where fish kills have been reported since 1960. An intensive study of the chemistry of atmospheric...
[Book review] A guide to integrated fish health management in the Great Lakes basin, edited by F. P. Meyer, J. W. Warren, and T. G. Carey
G. L. Bullock
1984, Journal of Wildlife Diseases (20) 169-170
Review of: A guide to integrated fish health management in the Great Lakes basin, Special Publication 83-2. F. P. Meyer, J. W. Warren, and T. G. Carey, eds. 1983. Great Lakes Fishery Commission, Ann Arbor, Michigan....
Offset of Tertiary arcs on the Alaska Peninsula: A section in Geological Survey research, fiscal year 1981
U.S. Geological Survey
1984, Professional Paper 1375
Geologic mapping and potassium-argon dating by R. L. Detterman, F. H. Wilson, J. E. Case, and Nora Shew in the Ugashik and western part of the Karluk quadrangles have shown that the Eocene and Oligocene volcanic arc continues into these quadrangles from the south in the Chignik and Sutwik Island...
Waste water management techniques at the United States national fish hatcheries
Adam G. Fox
1984, Conference Paper
No abstract available ...
Phenotypic variation of the Mexican duck (Anas platyrhynchos diazi) in Mexico
N.J. Scott Jr., R.P. Reynolds
1984, Condor (86) 266-274
A collection of 98 breeding Mexican Ducks (Anas platyrhynchos diazi) was made in Mexico from six areas between the United States border with Chihuahua and Lake Chapala, Jalisco, in order to study geographic variation. Plumage indices showed a relatively smooth clinal change from north to south; northern populations were...
Chemical modifications of estuarine water by a power plant using continuous chlorination
G.R. Helz, R. Sugam, A.C. Sigleo
1984, Environmental Science & Technology (18) 192-199
No abstract available....
TOPOLOGICAL STRUCTURING OF RASTER-SCANNED LINE MAP DATA.
Robin G. Fegeas, Richard A. Pearsall
1984, Conference Paper, Technical Papers of the American Congress of Surveying and Mapping
The U. S. Geological Survey has a requirement for the collection of large amounts of digital map data from existing graphic map separates. Prototype production techniques have been developed to capture line data from the map separates using a raster-scanning input device. After minimal editing in raster form, the data...
