Mineralization, alteration, and hydrothermal metamorphism of the ophiolite-hosted Turner-Albright sulfide deposit, southwestern Oregon
R.A. Zierenberg, Wayne C. Shanks III, W.E. Seyfried Jr., R.A. Koski, M.D. Strickler
1988, Journal of Geophysical Research Solid Earth (93) 4657-4674
The Turner-Albright sulfide deposit, part of the Josephine ophiolite, formed on and below the seafloor during Late Jurassic volcanism at a back arc spreading center. Ore fluids were probably localized by faults which were active on the seafloor at the time of sulfide deposition. The uppermost massive sulfide formed on...
Hausmannite (Mn3O4) conversion to manganite (γ-MnOOH) in dilute oxalate solution
Carol J. Lind
1988, Environmental Science & Technology (22) 62-70
Oxalic acid retards the alteration of Mn3O4 to γ-MnOOH during aging at pH 7.4 ?? 0.2 in well-aerated, abiotic suspensions that contain 4.4 ?? 10-3 M total Mn. In solutions of 1.25 ?? 10-3 M oxalate and greater, about 15% of the initial Mn3O4 altered to ??-MnOOH by day 10,...
The Argos seismic data message system
J.S. Derr, R.N. Hunter
1988, Bulletin of the Seismological Society of America (78) 1000-1005
A reliable, inexpensive method for sending limited daily seismic data messages from remote observatories to the National Earthquake Information Center has been developed for use with the Argos satellite system. Data messages are compressed on a microcomputer and passed automatically to a simple transmitter. About 4 hr later, the data...
The aqueous geochemistry of uranium in a drainage containing uraniferous organic-rich sediments, Lake Tahoe area, Nevada, USA
R. A. Zielinski, J. K. Otton, R. B. Wanty, C. T. Pierson
1988, Uranium (4) 281-305
Anomalously uraniferous waters occur in a small (4.2 km2) drainage in the west-central Carson Range, Nevada, on the eastern side of Lake Tahoe. The waters transport uranium from local U-rich soils and bedrock to organic-rich valley-fill sediments where it is concentrated, but weakly bound. The dissolved U and the U...
The geology of the Florida Keys
E.A. Shinn
1988, Oceanus (31) 46-53
The Florida reefs have evolved over the last 7000 years during rising sea level. An ancient reef existed from sand shoals on which Miami and Key West are now sited before the last glaciation (100 000 to 125 000 years ago). During the glacial period sea level fell to >300...
Volcanic hazards and public response
D. W. Peterson
1988, Journal of Geophysical Research Solid Earth (93) 4161-4170
Although scientific understanding of volcanoes is advancing, eruptions continue to take a substantial toll of life and property. Some of these losses could be reduced by better advance preparation, more effective flow of information between scientists and public officials, and better understanding of volcanic behavior by all segments of the...
Fluid-inclusion evidence for previous higher temperatures in the Miravalles geothermal field, Costa Rica
K.E. Bargar, R.O. Fournier
1988, Geothermics (17) 681-693
Heating and freezing data were obtained for liquid-rich secondary fluid inclusions in magmatic quartz, hydrothermal calcite and hydrothermal quartz crystals from 19 sampled depths in eight production drill holes (PGM-1, 2, 3, 5, 10, 11, 12 and 15) of the Miravalles geothermal field in northwestern Costa Rica. Homogenization temperatures for...
Instrumentation for a dry-pond detention study
L. M. Pope, M.E. Jennings, K.G. Thibodeaux
1988, Conference Paper
A 12.3-acre, fully urbanized, residential land-use catchment was instrumented by the U. S. Geological Survey in Topeka, Kansas. Hydraulic instrumentation for flow measurement includes two types of flumes, a pipe-insert flume and a culvert-inlet (manhole) flume. Samples of rainfall and runoff for water-quality analyses were collected by automatic, 3-liter, 24-sample...
Garnet compositions and their use as indicators of peraluminous granitoid petrogenesis - southeastern Arabian Shield
du Bray
1988, Contributions to Mineralogy and Petrology (100) 205-212
Garnet, an uncommon accessory mineral in igneous rocks, occurs in seven small peraluminous granitoid plutons in the southeastern Arabian Shield; textural equilibrium between garnet and other host granitoid minerals indicates that the garnets crystallized from their host magmas. Compositions of the garnets form three groups that reflect host-granitoid compositions, which...
Irrigation drainage: Green River basin, Utah
Doyle W. Stephens, Bruce Waddell, Jerry B. Miller
1988, Conference Paper
A reconnaissance of wildlife areas in the middle Green River basin of Utah during 1986-87 determined that concentrations of selenium in water and biological tissues were potentially harmful to wildlife at the Stewart Lake Waterfowl Management Area and in the Ouray National Wildlife Refuge. Concentations of selenium in irrigation drainage...
Interrelations among pyroclastic surge, pyroclastic flow, and lahars in Smith Creek valley during first minutes of 18 May 1980 eruption of Mount St. Helens, USA
S.R. Brantley, R. B. Waitt
1988, Bulletin of Volcanology (50) 304-326
A devastating pyroclastic surge and resultant lahars at Mount St. Helens on 18 May 1980 produced several catastrophic flowages into tributaries on the northeast volcano flank. The tributaries channeled the flows to Smith Creek valley, which lies within the area devastated by the surge but was unaffected by the great...
Concentration of gold in natural waters
J. B. McHugh
1988, Journal of Geochemical Exploration (30) 85-94
The purpose of this paper is to investigate the amount of gold present in natural waters. One hundred and thirty-two natural water samples were collected from various sources and analyzed for gold by the latest techniques. Background values for gold in...
A BASIC program for locating references cited in geoscience manuscripts
Daniel O. Hayba
1988, Computers & Geosciences (14) 131-134
[No abstract available]...
A magmatic model of Medicine Lake Volcano, California
J.M. Donnelly-Nolan
1988, Journal of Geophysical Research Solid Earth (93) 4412-4420
Medicine Lake volcano is a Pleistocene and Holocene shield volcano of the southern Cascade Range. It is located behind the main Cascade arc in an extensional tectonic setting where high-alumina basalt is the most commonly erupted lava. This basalt is parental to the higher-silica calc-alkaline and tholeiitic lavas that make...
Potential for diamond in kimberlites from Michigan and Montana as indicated by garnet xenocryst compositions
E. S. McGee
1988, Economic Geology (83) 428-432
No abstract available....
Effects of the antimicrobic tiamulin on seven gram-negative bacterial fish pathogens
G. L. Bullock, R. L. Herman
1988, Journal of Wildlife Diseases (24) 22-24
In vitro and in vivo tests were carried out with tiamulin and gram-negative bacterial pathogens of fish. Determination of minimum inhibitory concentration for 51 strains of seven species of gram-negative bacterial pathogens showed that only strains of Vibrio anguillarum were sensitive at 1.6–6.25 ppm, while...
Principal component analysis of geodetically measured deformation in Long Valley caldera, eastern California, 1983-1987
J.C. Savage
1988, Journal of Geophysical Research Solid Earth (93) 13297-13305
Typical geodetic measurements of deformation consist of repeated surveys of a particular geodetic network. Such deformation data can be interpreted as a consequence of one or more self-coherent sources by means of principal component analysis. A self-coherent source is defined as any source that produces deformation that is time and...
Subsidence of Puna, Hawaii inferred from sulfur content of drilled lava flows
J.G. Moore, D. M. Thomas
1988, Journal of Volcanology and Geothermal Research (35) 165-171
Sulfur was analyzed in more than 200 lava samples from five drill holes located on the east rift zone of Kilauea volcano on the island of Hawaii. The sulfur content is a gage of whether lava was erupted subaerially (low sulfur) or erupted subaqueously (high sulfur). Despite considerable variation, sulfur...
Low molecular weight species in humic and fulvic fractions
M. A. Wilson, P. J. Collin, Ronald L. Malcolm, E. Michael Perdue, P. Cresswell
1988, Organic Geochemistry (12) 7-12
Fourier transform solution 1H nuclear magnetic resonance (NMR) spectrometry with homogated water peak irradiation is a useful method for detecting low molecular weight substances in humic extracts. Succinate, acetate, methanol, formate, lactate and some aryl methoxyl compounds have been detected in extracts from a wide range of sources. In view of...
Applications of a simulation model to decisions in mallard management
L.M. Cowardin, Douglas H. Johnson, T.L. Shaffer, D. W. Sparling
1988, Fish and Wildlife Technical Report 17
A system comprising simulation models and data bases for habitat availability and nest success rates was used to predict results from a mallard (Anas platyrhynchos) management plan and to compare six management methods with a control. Individual treatments in the applications included land purchase for waterfowl production, wetland easement purchase,...
The Detroit River, Michigan: an ecological profile
Bruce A. Manny, Thomas A. Edsall, Eugene Jaworski
1988, Biological Report 85(7.17)
A part of the connecting channel system between Lake Huron and Lake Erie, the Detroit River forms an integral link between the two lakes for both humans and biological resources such as fish, nutrients, and plant detritus. This profile summarizes existing scientific information on the ecological structure and functioning...
Preliminary report on effect of bullfrogs on wetland herpetofaunas in southeastern Arizona
C.R. Schwalbe, P.C. Rosen
1988, Research Memorandum RM-166
No abstract available at this time...
Gorwth, composition, and fin quality of Atlantic salmon fed different diets at seasonal temperatures in a laboratory and hatchery
C. A. Lemm, D. V. Rottiers, D. S. Dropkin, B.A. Dennison
1988, Biological Report 8
No abstract available at this time...
Geohydrology and mathematical simulation of the Pajaro Valley aquifer system, Santa Cruz and Monterey Counties, California
M. J. Johnson, C.J. Londquist, Julie Laudon, H. T. Mitten
1988, Water-Resources Investigations Report 87-4281
Groundwater development has resulted in lowered water levels and seawater intrusion in the Pajaro Valley, California. An investigation was undertaken to describe the geohydrology of the groundwater flow system and to evaluate the response of the system to pumping stresses by using a mathematical model. The aquifer system consists of...
The St. Clair River and Lake St. Clair, Michigan: an ecological profile
Thomas A. Edsall, Bruce A. Manny, Nicholas Raphael
1988, Biological Report 85(7.3)
The St. Clair River and Lake St. Clair form a part of the connecting channel system between Lake Huron and Lake Erie. This report synthesizes existing information on the ecological structure and function of this ecosystem. Chapters include descriptions of climatology, hydrology, and geology of the region; biological...
