Geochronology of Precambrian granites and associated U-Ti-Th mineralization, northern Olary province, South Australia
K.R. Ludwig, J.A. Cooper
1984, Contributions to Mineralogy and Petrology (86) 298-308
Proterozoic granitoids and metamorphic rocks in the Olary province of the Willyama block of South Australia host ore-grade amounts of U-Th-Ti and U-Fe-Ti-Th minerals. U-Pb-Th isotope analyses on zircons from all granitoids associated with the Crocker Well brannerite deposit indicate that these granitoids were intruded within a short time span,...
U.S. Geological Survey probabilistic methodology for oil and gas resource appraisal of the United States
R. A. Crovelli
1984, Journal of the International Association for Mathematical Geology (16) 797-808
Probabilistic methodology used by the U.S. Geological Survey is described for estimating the quantity of undiscovered recoverable conventional resources of oil and gas in the United States. A judgmental probability distribution of the "quantity of resource" and its properties is determined for a geologic province or basin. From this distribution,...
Water gun vs air gun: A comparison
D. R. Hutchinson, R. S. Detrick
1984, Marine Geophysical Research (6) 295-310
The water gun is a relatively new marine seismic sound source that produces an acoustic signal by an implosive rather than explosive mechanism. A comparison of the source characteristics of two different-sized water guns with those of conventional air guns shows the the water gun signature is cleaner and much...
The relationship of Landsat digital data to the properties of Arizona rangelands
Emil H. Horvath, D. F. Post, J. B. Kelsey
1984, Soil Science Society of America Journal (48) 1331-1334
Pedon descriptions, vegetation transect information, and Landsat digital data were obtained for 110 sites on the Tonto National Forest in central Arizona. Using the field and satellite data, 33 variables were evaluated and prediction models were generated using stepwise multiple regression techniques. The following six factors explained 84% of the...
Streamflow gain-and-loss and suspended-sediment characteristics of the South Platte River and three irrigation canals near Fort Morgan, Colorado
B. C. Ruddy
1984, Water-Resources Investigations Report 84-4220
A 2-year study during 1982-83 was made to document the streamflow gain-and-loss and suspended sediment characteristics of the South Platte River, Fort Morgan Canal, Upper Platte and Beaver Canal, and the Lower Platte and Beaver Canal near Fort Morgan, Colorado, prior to possible construction of the proposed Narrows Reservoir. Six...
U-Pb isotope systematics and apparent ages of uranium ores, Ambrosia Lake and Smith Lake districts, Grants mineral belt, New Mexico
K.R. Ludwig, K. R. Simmons, J.D. Webster
1984, Economic Geology (79) 322-337
Orebodies occur in continental sandstones of the Upper Jurassic Morrison Formation and comprise two main types of mineralization; primary ore formed early in the history of the host rock and resulted in tabular, peneconcordant orebodies rich in organic material; redistributed ore apparently was formed by oxidative destruction and reconcentration of...
Origins and exploration significance of replacement and vein-type alunite deposits in the Marysvale volcanic field, west central Utah
C. G. Cunningham, R. O. Rye, T. A. Steven, H. H. Mehnert
1984, Economic Geology (79) 50-71
Alunite deposits formed 23 m.y. ago in near-surface, highly oxidizing conditions at the tops of hydrothermal plumes that were spaced at 3- to 4-km intervals around a monzonite stock. The delta 34 S values of 11.5 to 15.4 per mil for replacement alunite along with geologic constraints indicate that sulfate sulfur was...
Ground-based upward extrapolated gravity data for use in testing the aerial profiling of terrain system (APTS)
T.G. Hildenbrand, R.P. Kucks, W. F. Hanna
1984, Open-File Report 84-775
No abstract available....
Pegmatite/wallrock interactions, Black Hills, South Dakota: Progressive boron metasomatism adjacent to the Tip Top pegmatite
C.K. Shearer, J. J. Papike, S.B. Simon, J.C. Laul, R.P. Christian
1984, Geochimica et Cosmochimica Acta (48) 2563-2579
Interaction between country rock and fluids derived from the Tip Top pegmatite has resulted in a series of boron enriched assemblages. Between unaltered quartz-mica schist to the pegmatite contact is a succession of four mineral assemblages:1.(1) Quartz-Biotite-Potassium Feldspar assemblage (Q-B-K), which consists essentially of the original metamorphic...
Numerical noise in ocean and estuarine models
R. Walters, G. F. Carey
1984, Advances in Water Resources (7) 15-20
Approximate methods for solving the shallow water equations may lead to solutions exhibiting large fictitious, numerically-induced oscillations. The analysis of the discrete dispersion relation and modal solutions of small wavelengths provides a powerful technique for assessing the sensitivity of alternative numerical schemes to irregular data which may lead to such...
Banded iron-formations of late Proterozoic age in the central eastern desert, Egypt: Geology and tectonic setting
P.K. Sims, H. L. James
1984, Economic Geology (79) 1777-1784
In the central Eastern Desert of Egypt, deposits of iron-formation of the Algoma type occur as sharply defined stratigraphic units within layered volcanogenic rocks of late Proterozoic age. The volcanic sequence is characterized by interfingering and repetition of rocks of dominantly andesite-basalt composition and by tectonically juxtaposed ophiolitelike assemblages; it...
A survey of North American migratory waterfowl for duck plague (duck virus enteritis) virus
Christopher J. Brand, Douglas E. Docherty
1984, Journal of Wildlife Diseases (20) 261-266
A survey of migratory waterfowl for duck plague (DP) virus was conducted in the Mississippi and Central flyways during 1982 and in the Atlantic and Pacific flyways during 1983. Cloacal and pharyngeal swabs were collected from 3,169 migratory waterfowl in these four flyways, principally mallards (Anas platyrhynchos L.), black ducks (Anas...
Distribution of Eurasian watermilfoil, Myriophyllum spicatum, in the St. Clair-Detroit River system in 1978
Donald W. Schloesser, Bruce A. Manny
1984, Journal of Great Lakes Research (10) 322-326
Submersed macrophytes were surveyed at 595 stations located throughout the St. Clair-Detroit River system between Lakes Huron and Erie, 23 August to 13 October 1978. Eurasian watermilfoil (Myriophyllum spicatum), first recorded in the system in 1974, became the fourth most common submersed macrophyte in the system by 1978. However, it...
Golden Gate uses team approach on 'monumental' resource problems
J. A. Howell
1984, Park Science (4) 15-16
Persistence of Pasteurella multocida in Nebraska wetlands under epizootic conditions
J.I. Price, C. J. Brand
1984, Journal of Wildlife Diseases (20) 90-94
Gleason Basin, a marsh located in the western part of the Rainwater Basin in Nebraska, was selected during the 1980 spring waterfowl migration as a study site to determine the presence and persistence of virulent Pasteurella multocida. Avian cholera mortality in migratory waterfowl using the Basin increased during a 2-wk period...
Notes on mortality of American white pelicans at Chase Lake, North Dakota
John G. Sidle, P.M. Arnold, R. K. Stroud
1984, Prairie Naturalist (16) 131-134
Known impacts of exotic fishes in the contintental United States
N.N. Taylor, W.R. Courtenay Jr., J.A. McCann
W. R. Courtenay Jr., J. R. Stauffer Jr., editor(s)
1984, Book chapter, Distribution, Biology and Management of Exotic Fishes
No abstract available at this time...
Preliminary geologic map of the Colville Indian Reservation, Ferry and Okanogan Counties, Washington, with a table of potassium-argon ages
1984, Open-File Report 84-389
No abstract available....
Potential uses of water hyacinths in the Tucson area--an addendum for the Pima County Wastewater Management Department
P. Warshall, M. Jennings
1984, Report
No abstract available at this time...
Predation on lake whitefish eggs by longnose suckers
Robert T. Nester, Thomas P. Poe
1984, Journal of Great Lakes Research (10) 327-328
In November 1981, we observed intense predation on lake whitefish (Coregonus clupeaformis) eggs by longnose suckers (Catostomus catostomus) on lake whitefish spawning grounds in northwestern Lake Huron. Since longnose suckers commonly frequent the same habitat used by spawning lake whitefish, there exists the potential for high losses of eggs due...
Distribution of exotic fishes in the continental United States
W.R. Courtenay Jr., D.A. Hensley, J.N. Taylor, J.A. McCann
W. R. Courtenay Jr., J. R. Stauffer Jr., editor(s)
1984, Book chapter, Distribution, Biology and Management of Exotic Fishes
No abstract available at this time...
San Agustin Plains, New Mexico: Age and paleoenvironmental potential reassessed
Vera Markgraf, J.P. Bradbury, R. M. Forester, G. Singh, R.S. Sternberg
1984, Quaternary Research (22) 336-343
Paleomagnetic analysis of samples from the original 600-m-long core from the San Agustin Plains, New Mexico, showed an unquestionable reversal stratigraphy dating the record back to at least 1.6 my. Analysis of pollen, ostracodes, and algae of a duplicate sample section in the vicinity of the original coring site and...
Preliminary map showing the difference between the potentiometric surfaces of the Aquia aquifer of April 1979 and September 1982 in southern Maryland
F. K. Mack, J. C. Wheeler, S. E. Curtin
1984, Open-File Report 83-930
A map was prepared that shows the net change in the potentiometric surface of the Aquia aquifer in southern Maryland between April 1979 and September 1983. During this period, the potentiometric surface declined (1) at least a few feet throughout the entire southern Maryland area, and (2) more than 10...
Mineral resources of the Tracy Arm-Fords Terror Wilderness Study Area and vicinity, Alaska
Water Resources Division, U.S. Geological Survey
1984, Bulletin 1525
No abstract available....
Mantle metasomatism: The REE story
H. G. Wilshire
1984, Geology (12) 395-398
Refractory rocks with light REE/heavy REE ratios greater than chondrite are common as xenoliths in basalts and kimberlites and are found in some oceanic peridotite massifs. This has led to the supposition that large parts of the upper mantle have been metasomatically altered...
