Bedrock geology and tectonic evolution of the Wrangellia, Peninsular, and Chugach terranes along the Trans-Alaska Crustal Transect in the Chugach Mountains and southern Copper River Basin, Alaska
George Plafker, W. J. Nokleberg, J. S. Lull
1989, Journal of Geophysical Research Solid Earth (94) 4255-4295
The Trans-Alaskan Crustal Transect in the southern Copper River Basin and Chugach Mountains traverses the margins of the Peninsular and Wrangellia terranes, and the adjacent accretionary oceanic units of the Chugach terrane to the south. The southern Wrangellia terrane margin consists of a polymetamorphosed magmatic arc complex at least in...
Tectonic setting of the Yukon-Koyukuk basin and its borderlands, western Alaska
W. W. Patton Jr., S. E. Box
1989, Journal of Geophysical Research Solid Earth (94) 15807-15820
The Yukon-Koyukuk basin of western Alaska is composed of an arcuate belt of Jurassic and Early Cretaceous subduction-related volcanic and plutonic rocks (Koyukuk terrane) flanked by deep subbasins filled with mid-Cretaceous terrigenous sedimentary rocks. The basin is bordered on three sides by metamorphosed Proterozoic and Paleozoic continental rocks (Seward, Arctic...
Lead and cadmium associated with saltwater intrusion in a New Jersey aquifer system
Amleto A. Pucci Jr., Douglas A. Harriman, Elisabeth M. Ervin, Lisa Bratton, Alison Gordon
1989, Water Resources Bulletin (25) 1267-1272
The U.S. Geological Survey collected ground-water samples from the upper and middle aquifers of the Potomac-Raritan-Magothy aquifer system in a 400-square-mile area of New Jersey from 1984 through 1986. Concentrations of lead were greater than the U.S. Environmental Protection Agency maximum contaminant level (MCL) of 50 micrograms per liter in...
Horizontal anisotropy of the principal ground-water flow zone in the Salinas alluvial fan, Puerto Rico
V. Quinones-Aponte
1989, Ground Water (27) 491-500
Well drawdown data from an anisotropic aquifer in the Salinas alluvial fan were collected and analyzed with a computer program called TENSOR2D. The program uses ordinary and weighted least-squares optimization procedures to solve the system of simultaneous equations needed to define the theoretical transmissivity ellipse. Prediction of drawdown data was...
Graphical method for determining the coefficient of consolidation c from a flow-pump permeability test
Roger H. Morin, Harold W. Olsen, Karl R. Nelson, James D. Gill
1989, Geotechnical Testing Journal (12) 302-307
A graphical method has been developed for determining the coefficient of consolidation from the transient phases of a flow-pump permeability test. The flow pump can be used to infuse fluid into or withdraw fluid from a laboratory sediment specimen at a constant volumetric rate in order to obtain data that...
Porosity development in coastal carbonate aquifers
W. E. Sanford, Leonard F. Konikow
1989, Geology (17) 249-252
Geochemical mixing theory suggests that the mixing of seawater and calcite-saturated fresh ground water can result in a solution that is undersaturated with respect to calcite. Previous studies of the mixing of such waters in carbonate rocks along certain coastlines have indicated that...
Retardation of ammonium and potassium transport through a contaminated sand and gravel aquifer: The Role of cation exchange
M.L. Ceazan, E.M. Thurman, R. L. Smith
1989, ES and T Contents (23) 1402-1408
The role of cation exchange in the retardation of ammonium (NH4+) and potassium (K+) transport in a shallow sand and gravel aquifer was evaluated by use of observed distributions of NH4+ and K+ within a plume of sewage-contaminated groundwater, small-scale tracer injection tests, and batch sorption experiments on aquifer material....
Analysis of accuracy of approximate, simultaneous, nonlinear confidence intervals on hydraulic heads in analytical and numerical test cases
M. C. Hill
1989, Water Resources Research (25) 177-190
Inaccuracies in parameter values, parameterization, stresses, and boundary conditions of analytical solutions and numerical models of groundwater flow produce errors in simulated hydraulic heads. These errors can be quantified in terms of approximate, simultaneous, nonlinear confidence intervals presented in the literature. Approximate confidence intervals can be applied in both error...
A reinterpretation of the δDH2O of inclusion fluids in contemporaneous quartz and sphalerite, Creede mining district, Colorodo: a generic problem for shallow orebodies?
Nora K. Foley, Philip M. Bethke, Robert O. Rye
1989, Economic Geology (84) 1966-1977
Water extracted from fluid inclusions in quartz from shallow epithermal ore deposits often has a hydrogen isotope composition (δD) different from that of water extracted from inclusions in associated minerals. This difference is usually attributed to the involvement of primary fluids from multiple sources. Isotopic and homogenization and freezing temperature...
Behaviour of abandoned room and pillar mines in Illinois
G.G. Marino, R.A. Bauer
1989, International Journal of Mining and Geological Engineering (7) 271-281
Little comprehensive information has been reported on the behaviour of room-and-pillar mines. The objective of this paper is to present case data on mine failures in the Illinois basin for use in practice. Presented are results of an ongoing study and details on the site characteristics of cases where sags...
On the use of volumetric strain meters to infer additional characteristics of short-period seismic radiation
R. D. Borcherdt, M.J.S. Johnston, G. Glassmoyer
1989, Bulletin of the Seismological Society of America (79) 1006-1023
Volumetric strain meters (Sacks-Evertson design) are installed at 15 sites along the San Andreas fault system, to monitor long-term strain changes for earthquake prediction. Deployment of portable broadband, high-resolution digital recorders (GEOS) at several of the sites extends the detection band for volumetric strain to periods shorter than 5 ×...
Geologic implications of topographic, gravity, and aeromagnetic data in the northern Yukon-Koyukuk province and its borderlands, Alaska
J. W. Cady
1989, Journal of Geophysical Research Solid Earth (94) 15821-15841
The northern Yukon-Koyukuk province is characterized by low elevation and high Bouguer gravity and aeromagnetic anomalies in contrast to the adjacent Brooks Range and Ruby geanticline. Using newly compiled digital topographic, gravity, and aeromagnetic maps, I have divided the province into three geophysical domains. The Koyukuk domain, which is nearly...
An introduction to quiet daily geomagnetic fields
W.H. Campbell
1989, Pure and Applied Geophysics PAGEOPH (131) 315-331
On days that are quiet with respect to solar-terrestrial activity phenomena, the geomagnetic field has variations, tens of gamma in size, with major spectral components at about 24, 12, 8, and 6 hr in period. These quiet daily field variations are primarily due to the dynamo currents flowing in the...
Radiocarbon dates for lava flows from northeast rift zone of Mauna Loa Volcano, Hilo 7 1/2 minute quadrangle, Island of Hawaii
J.M. Buchanan-Banks, J. P. Lockwood, M. Rubin
1989, Radiocarbon (31) 179-186
Twenty-eight 14C analyses are reported for carbonized roots and other plant material collected from beneath 15 prehistoric lava flows erupted from the northeast rift zone (NERZ) of Mauna Loa Volcano (ML) utilizing the recovery techniques of Lockwood and Lipman (1980). Most samples were collected from the Hilo 7 1/2’ quadrangle...
Comparison of methods for estimating flood magnitudes on small streams in Georgia
Glen W. Hess, McGlone Price
1989, Water Resources Bulletin (25) 149-154
The U.S. Geological Survey has collected flood data for small, natural streams at many sites throughout Georgia during the past 20 years. Flood-frequency relations were developed for these data using four methods: (1) observed (log-Pearson Type III analysis) data, (2) rainfall-runoff model, (3) regional regression equations, and (4) map-model combination....
Debris is not a cheese: litter in coastal Louisiana
Dianne M. Lindstedt, Joseph C. Holmes Jr.
1989, Conference Paper, Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management
An 18-month study of six Louisiana beaches determined the extent, composition, and possible sources of beach litter. Data showed that from 2590 to 23,154 items may be encountered along any one-mile stretch of Louisiana beach, depending upon location and season, and that densities of litter ranged from 5 to 28...
Constraints from fluid inclusions on sulfide precipitation mechanisms and ore fluid migration in the Viburnum Trend lead district, Missouri
E. L. Rowan, D. L. Leach
1989, Economic Geology (84) 1948-1965
Measurements on fluid inclusions in hydrothermal dolomite cements place constraints on sulfide precipitation mechanisms and on the thermal-hydrologic processes which formed the Viburnum Trend Mississippi Valley-type lead district. Homogenization temperatures and freezing point depressions were determined for fluid inclusions in Bonneterre Dolomite-hosted dolomite cements in mine samples, as well as...
Thrust faults and related structures in the crater floor of Mount St. Helens volcano, Washington
W.W. Chadwick Jr., D. A. Swanson
1989, Geological Society of America Bulletin (101) 1507-1519
A lava dome was built in the crater of Mount St. Helens by intermittent intrusion and extrusion of dacite lava between 1980 and 1986. Spectacular ground deformation was associated with the dome building events and included the development of a system of radial...
Nearshore bars and the break-point hypothesis
A. H. Sallenger Jr., Peter A. Howd
1989, Coastal Engineering (12) 301-313
The set of hypotheses calling for bar formation at the break point was tested with field data. During two different experiments, waves were measured across the surf zone coincident with the development of a nearshore bar. We use a criterion, based on the wave height to depth ratio, to determine...
Depositional environments and tectonic controls on the coal-bearing Lower to Middle Jurassic Yan'an Formation, southern Ordos Basin, China
E. A. Johnson, Liu Shu, Zhang Yonglin
1989, Geology (17) 1123-1126
The Ordos Basin of north-central China is well known for vast energy resources. This nonmarine interior basin developed on the North China-Korean platform following the Late Triassic Indochina orogeny and, for a time, contained a large freshwater lake prior to being uplifted into...
Pb-Bi-Ag-Cu-(Hg) chemistry of galena and some associated sulfosalts. A review and some new data from Colorado California and Pennsylvania
Eugene E. Foord, Daniel R. Shawe
1989, Canadian Mineralogist (27 pt 3) 363-382
Galena, associated with Pb-Bi-Ag sulfosalts and simple sulfides, contains varied amounts of Ag and Bi in the Dandy vein system, Idarado mine, Ouray, Colorado; the Jackass mine, Darwin District, California; and the Leadville district, Colorado. Silver- and bismuth-bearing galena associated with minor amounts of pyrite, chalcopyrite and sphalerite occur at...
Urban watershed data for the United States
Janice M. Fulford
1989, Conference Paper
The contents of an urban watershed data base compiled for a national urban flood-frequency study by the U.S. Geological Survey are described. The data base includes information for 269 urbanized watersheds in 56 metropolitan areas in 31 states in the continental United States and Hawaii....
Geochemistry of intrusive rocks associated with the Latir volcanic field, New Mexico, and contrasts between evolution of plutonic and volcanic rocks
C.M. Johnson, G.K. Czamanske, P. W. Lipman
1989, Contributions to Mineralogy and Petrology (103) 90-109
Plutonic rocks associated with the Latir volcanic field comprise three groups: 1) ???25 Ma high-level resurgent plutons composed of monzogranite and silicic metaluminous and peralkaline granite, 2) 23-25 Ma syenogranite, and alkali-feldspar granite intrusions emplaced along the southern caldera margin, and 3) 19-23 Ma granodiorite and granite plutons emplaced south...
Petrology and age of volcanic-arc rocks from the continental margin of the Bering Sea: Implications for Early Eocene relocation of plate boundaries
A. S. Davis, L.-B.G. Pickthorn, T.L. Vallier, M. S. Marlow
1989, Canadian Journal of Earth Sciences (26) 1474-1490
Eocene volcanic flow and dike rocks from the Beringian margin have arc characteristics, implying a convergent history for this region during the early Tertiary. The extrusive rocks are basalt, basaltic andesite, andesite, and minor dacite and rhyolite. The intrusive sample is from a quartz diorite dike intruding serpentinized peridotite. Major-element...
The hydrologic reponses to development in regional sedimentary aquifers
R.H. Johnston
1989, Groundwater (27) 316-322
The hydrologic response to development of three of the most heavily pumped sedimentary aquifer systems in the United States is similar in some aspects and different in others. In the semiarid West, an unconfined sand aquifer and a confined sand and clay aquifer system have...
