Gas analyses from the Pu'u O'o eruption in 1985, Kilauea volcano, Hawaii
L. P. Greenland
1986, Bulletin of Volcanology (48) 341-348
Volcanic gas samples were collected from July to November 1985 from a lava pond in the main eruptive conduit of Pu'u O'o from a 2-week-long fissure eruption and from a minor flank eruption of Pu'u O'o. The molecular composition of these gases is consistent with thermodynamic equilibrium at a temperature...
Comparison of the marine oxygen isotope record, the Eustatic sea level record, and the chronology of glaciation in the United States of America
D. S. Fullerton, G.M. Richmond
1986, Quaternary Science Reviews (5) 197-200
[No abstract available]...
An integrated system for treating nitrogen supersaturated water
V. K. Dawson, L. L. Marking
1986, Progressive Fish-Culturist (48) 281-284
Groundwater is commonly supersaturated with nitrogen and must be treated before it is used for culturing fish–especially sensitive species such as lake trout (Salvelinus namaycush) and Atlantic salmon (Salmo salar). We treated water with an integrated system that passed water through a packed column aerator, then through a vacuum degasser,...
Radiocarbon studies of latest Pleistocene and Holocene lava flows of the Snake River Plain, Idaho: Data, lessons, interpretations
M. A. Kuntz, E.C. Spiker, M. Rubin, D.E. Champion, R.H. Lefebvre
1986, Quaternary Research (25) 163-176
Latest Pleistocene-Holocene basaltic lava fields of the Snake River Plain, Idaho, have been dated by the radiocarbon method. Backhoe excavations beneath lava flows typically yielded carbon-bearing, charred eolian sediment. This material provided most of the samples for this study; the sediment typically contains less than 0.2% carbon. Charcoal fragments were...
Differential dissolution of a Pleistocene reef in the groundwater mixing zone of coastal Yucatan, Mexico
W. Back, B.B. Hanshaw, J.S. Herman, J. N. Van Driel
1986, Geology (14) 137-140
Mixing of fresh groundwater with subterranean Caribbean seawater generates a highly reactive geochemical zone that enhances aragonite and calcite dissolution and permits neomorphism of aragonite....
Pb, Sr, Nd, and Hf isotopic constraints on the origin of Hawaiian basalts and evidence for a unique mantle source
P. Stille, D.M. Unruh, M. Tatsumoto
1986, Geochimica et Cosmochimica Acta (50) 2303-2319
Pb, Sr, Nd, and Hf isotopic relationships among basalts from the Hawaiian Islands suggest that these basalts were derived from three sources; the oceanic lithosphere (Kea end member), the depleted asthenosphere (posterosional end member) and a deep-mantle plume (Koolau end member).Hawaiian tholeiites are derived within the lithosphere and the isotopic...
Influences of quaternary climatic changes on processes of soil development on desert loess deposits of the Cima volcanic field, California
L. D. McFadden, S. G. Wells, J. C. Dohrenwend
1986, Catena (13) 361-389
Soils formed in loess are evidence of both relict and buried landscapes developed on Pliocene-to-latest Pleistocene basalt flows of the Cima volcanic field in the eastern Mojave Desert, California. The characteristics of these soils change systematically and as functions of the age and surface morphology of the lava flow. Four...
Geochemical and fluid zonation in the skarn environment at the tomboy-minnie gold deposits, Lander County, Nevada
T. G. Theodore, S. S. Howe, D. W. Blake, P.R. Wotruba
1986, Journal of Geochemical Exploration (25)
The Tomboy—Minnie gold deposits are related to the middle Tertiary porphyry copper system centered at Copper Canyon. Gold-silver ores in the deposits occur mostly in a pyrrhotite- and pyrite-rich basal 30-m-thick sequence of altered calcareous conglomerate belonging to the Middle Pennsylvanian Battle Formation. The entire mineralized system contained at least...
Role of aquitards in hydrogeochemical systems: A synopsis
W. Back
1986, Applied Geochemistry (1) 427-437
Aquitards exert significant influence on the hydrogeochemistry of aquifer systems. This influence is manifested somewhat differently depending on the relative position of aquitards within a system. In the deeper regimes, they are influential in the origin and distribution of brines and the development of geopressured zones. In intermediate regimes, they...
A Brief History of the U.S. Geological Survey
Mary C. Rabbitt
1986, Book
U-Pb geochronology of two augen gneiss terranes, Idaho: New data and tectonic implications
K. V. Evans, L. B. Fischer
1986, Canadian Journal of Earth Sciences (23) 1919-1927
U–Pb isotopic analyses of cogenetic zircon suites revise the ages of two augen gneiss terranes in central and northern Idaho. The augen gneiss of Priest River yields an upper-intercept concordia age for only moderately discordant zircons of 1576 ± 13 Ma; there is no evidence of an inherited xenocrystic lead component. Because this...
Location of potential ground-water quality monitoring wells, Daytona Beach 1° by 2° quadrangle, Florida
Martha E. Thagard, Paul R. Seaber
1986, Water-Resources Investigations Report 85-4132
No abstract available....
Location of potential ground-water quality monitoring wells, Jacksonville 1° by 2° quadrangle, Florida
Martha E. Thagard, Paul R. Seaber
1986, Water-Resources Investigations Report 85-4135
No abstract available....
Location of potential ground-water quality monitoring wells, Key West 1° by 2° quadrangle, Florida
Martha E. Thagard, Paul R. Seaber
1986, Water-Resources Investigations Report 85-4136
No abstract available....
Stochastic analysis of three-dimensional flow in a bounded domain
R.L. Naff, A. V. Vecchia
1986, Water Resources Research (22) 695-704
A commonly accepted first-order approximation of the equation for steady state flow in a fully saturated spatially random medium has the form of Poisson's equation. This form allows for the advantageous use of Green's functions to solve for the random output (hydraulic heads) in terms of a convolution over the...
HYDRODYNAMIC SIMULATION OF THE UPPER POTOMAC ESTUARY.
Raymond W. Schaffranck
1986, Conference Paper
Hydrodynamics of the upper extent of the Potomac Estuary between Indian Head and Morgantown, Md. , are simulated using a two-dimensional model. The model computes water-surface elevations and depth-averaged velocities by numerically integrating finite-difference forms of the equations of mass and momentum conservation using the alternating direction implicit method. The...
Location of potential ground-water quality monitoring wells, Orlando 1° by 2° quadrangle, Florida
Martha E. Thagard, Paul R. Seaber
1986, Water-Resources Investigations Report 85-4138
No abstract available....
Location of potential ground-water quality monitoring wells, Tampa 1° x 2° quadrangle, Florida
Martha E. Thagard, Paul R. Seaber
1986, Water-Resources Investigations Report 85-4141
No abstract available....
RELATION BETWEEN SURFACE-WATER QUALITY AND THE COMPOSITION OF COAL IN PIKE COUNTY, KENTUCKY.
Jay Kiesler
1986, Conference Paper, University of Kentucky, Office of Engineering Services, (Bulletin) UKY BU
The quality of surface water in Pike County, Kentucky, seems to reflect the composition of coals in the county. Groundwater acquires mineral concentration characteristics of the rocks through which it moves. When groundwater is discharged to streams the mineral concentrations in streams, especially during low flow periods, are characteristic of...
Stratigraphic setting and mineralogy of the Arctic volcanogenic massive sulfide prospect, Ambler district, Alaska
J.M. Schmidt
1986, Economic Geology (81) 1619-1643
The Arctic prospect, south central Brooks Range, is among the 30 largest of 508 volcanic-hosted massive sulphide deposits in the world. The massive sulphide lenses are interlayered with graphitic schist between metamorphosed rhyolite porphyries in Middle Devonian to early Mississippian metamorphosed volcanic, volcaniclastic and sedimentary rocks. Hydrothermal alteration is of...
Kinetics of reduction of plutonium(VI) and neptunium(VI) by sulfide in neutral and alkaline solutions
K.L. Nash, J.M. Cleveland, J.C. Sullivan, M. Woods
1986, Inorganic Chemistry (25) 1169-1173
No abstract available....
Shuttle imaging radar: Physical controls on signal penetration and subsurface scattenng in the Eastern Sahara
Gerald G. Schaber, John F. McCauley, Carol S. Breed, Gary R. Olhoeft
1986, IEEE Transactions on Geoscience and Remote Sensing (GE-24) 603-623
SIR-A signal penetration and subsurface backscatter within the upper meter or so of the sediment blanket in the Eastern Sahara of southern Egypt and northern Sudan are enhanced both by radar sensor parameters and by the physical and chemical characteristics of eolian and alluvial materials. Interpretation of SIR-A images by...
A comparison of several methods for the solution of the inverse problem in two-dimensional steady state groundwater flow modeling
Logan K. Kuiper
1986, Water Resources Research (22) 705-714
Two geostatistical approaches for the estimation of hydraulic conductivity and hydraulic head from hydraulic conductivity and hydraulic head measurements are developed for two-dimensional steady flow with sinks. For both approaches the field of the logarithm of hydraulic conductivity (log-conductivity) is represented as a random field with mean θ1+θ2x+θ3y where xand y denote Cartesian coordinates,...
Phytoplankton spatial distribution in south San Francisco Bay: mesoscale and small-scale variability
Thomas M. Powell, James E. Cloern, Roy A. Walters
Douglas A. Wolfe, editor(s)
1986, Book chapter, Estuarine variability
Horizontal transects of surface salinity and in-vivo fluorescence indicate the existence of three distinct spatial regimes in South San Francisco Bay. A mid-Bay region of low phytoplankton biomass with little small-scale variance is bounded to the north and south by water masses having higher in-vivo fluorescence and enhanced small-scale variability....
Snow chemistry of the Cascade-Sierra Nevada Mountains
L.B. Laird, Howard E. Taylor, V. C. Kennedy
1986, Environmental Science & Technology (20) 275-290
This investigation assesses geographic variations in atmospheric deposition in Washington, Oregon, and California using snow cores from the Cascade-Sierra Nevada Mountains, collected from late February to mid-March 1983. A statistical analysis of the analytical and sampling precision was made. The snowpack in the higher Cascades and Sierra Nevada is not...
