Application of ERTS images and image processing to regional geologic problems and geologic mapping in northern Arizona
Alexander F.H. Goetz, Frederic C. Billingsley, A. R Gillespie, M. J. Abrams, R. L. Squires, Eugene Merle Shoemaker, I. Lucchitta, D. P. Elston
1975, Technical Report 32-1597
The purpose of this study was to apply the techniques of computer image processing to ERTS images as an aid to the solution of some regional geologic problems of significant interest.ERTS-1 images were applied to studies in the Shivwits Plateau, Coconino Plateau, and north-central Arizona regions. Unprocessed ERTS images revealed...
Discussion on K-Ar relations of granodiorite emplacement and tungsten and gold mineralization near the Getchell Mine, Humboldt County, Nevada: A reply
B. R. Berger, M.L. Silberman, Randolph A. Koski
1975, Economic Geology (70) 1487-1491
No abstract available....
Chemical halos as guides to lode deposit ore in the Park City District, Utah
Maurice A. Chaffee
1975, Economic Geology (70) 995-995
No abstract available....
Preparation and use of isopleth maps of landslide deposits: Comment and reply: REPLY
R. H. Wright, R. H. Campbell, T. H. Nilsen
1975, Geology (3) 217-218
No abstract available....
A procedure, using hydrofluoric acid, for quantitative mineral separations from silicate rocks
George J. Neuerburg
1975, Journal of Research of the U.S. Geological Survey (3) 377-378
Some minerals of silicate rocks can be quantitatively recovered from rock fragments by prolonged digestion in cold, concentrated hydrofluoric acid. The procedure yields clean, physically unharmed crystals, mostly of minerals that occur largely or only in trace amounts....
A computer-assisted procedure for information processing of geologic field data
Travis Hudson, Gerald Askevold, George Plafker
1975, Journal of Research of the U.S. Geological Survey (3) 369-375
We have examined several computer systems to see how they could aid information processing of geologic field data. The processing procedure we have chosen combines a systematic note-taking technique, a computer text-editor for creating files of data, and automated printing of selected data or of complete file copies. Traditional text...
A characteristic pattern of disequilibrium in some uranium ore deposits
Elmer S. Santos
1975, Journal of Research of the U.S. Geological Survey (3) 363-368
A redistribution of radium-226 in uranium ore deposits produces a characteristic pattern of disequilibrium in which uranium is greater than equivalent uranium in high-grade samples and equivalent uranium is greater than uranium in low-grade samples. The redistribution is a continuous process in uranium deposits, and the resulting pattern of disequilibrium...
Rockfall seismicity correlation with field observations, Makaopuhi Crater, Kilauea Volcano, Hawaii
Robert I. Tilling, Robert Y. Koyanagi, Robin T. Holcomb
1975, Journal of Research of the U.S. Geological Survey (3) 345-361
During August 7-13, 1972, intense and sustained rockfall activity occurred in Makaopuhi Crater on the east-rift zone of Kilauea Volcano. In a 4-day period (August 7-10), approximately 270,000 m3 of rockfall debris accumulated in Makaopuhi's west pit, representing a total kinetic energy release of about 101B ergs. Because the rockfalls...
Relations between thermal, photographic, and topographic linears and mapped and measured structures in a Precambrian terrane in Colorado
Bruce Bryant, Terry W. Offield, Paul W. Schmidt
1975, Journal of Research of the U.S. Geological Survey (3) 295-303
Comparison of orientation of faults, foliations, and joints, observed during geologic mapping in Colorado, with thermal, photographic, and topographic linears shows that topographic linears are statistically useful indicators of mappable faults and fractures, photographic linears are less useful, and thermal linears, believed to represent zones of moisture concentration, are parallel...
The influence of late Cenozoic stratigraphy on distribution of impoundment-related seismicity at Lake Mead, Nevada-Arizona
R. Ernest Anderson, R. L. Laney
1975, Journal of Research of the U.S. Geological Survey (3) 337-343
At Lake Mead, contrasts in permeability of upper Cenozoic sediments show a better correlation with irregularly distributed impoundment-related seismicity than do contrasts in structure. An evaluation of structures developed during the late Cenozoic fails to explain the erratic distribution of seismicity. An evaluation of the late Cenozoic stratigraphy, however, shows...
Widespread late glacial and postglacial tephra deposits from Mount St. Helens Volcano, Washington
Donal R. Mullineaux, Jack H. Hyde, Meyer Rubin
1975, Journal of Research of the U.S. Geological Survey (3) 329-335
Pumice layers composing four different groups of tephra beds (termed "sets"), whose stratigraphy, age, and trend away from Mount St. Helens are fairly well known, are potentially valuable stratigraphic markers in the northwestern United States and adjacent parts of Canada. All four tephra sets are less than about 18,000 yr...
Geology, geochemistry, and fluid-inclusion petrography of the Sapo Alegre porphyry copper prospect and its metavolcanic wallrocks, west-central Puerto Rico
Dennis P. Cox, Ileana Perez Gonzalez, J. Thomas Nash
1975, Journal of Research of the U.S. Geological Survey (3) 313-327
The Sapo Alegre prospect, a small porphyry copper-molybdenum occurrence in west-central Puerto Rico, is characterized by distinct zones of alteration and mineralization of quartz diorite porphyry. A biotite-chlorite zone in the porphyry near its contact with surrounding metavolcanic rocks contains copper, molybdenum, gold, silver, selenium, and tellurium. A quartz-sericite-pyrite zone...
Applications of remote sensing to structural interpretations in the southern Appalachians
J. E. Johnston, R. L. Miller, K. J. Englund
1975, Journal of Research of the U.S. Geological Survey (3) 285-293
Remote sensing is the technology of studying distant objects by measuring and recording energy from one or more segments of the electromagnetic spectrum. Imaging sensors which operate from medium- and high-altitude aircraft or from spacecraft can provide a synoptic view of large areas and of surface phenomena not evident in...
An occurrence of disseminated uraninite in Wheeler Basin, Grand County, Colorado
E. J. Young, P. L. Hauff
1975, Journal of Research of the U.S. Geological Survey (3) 305-311
Disseminated uraninite occurs in Wheeler Basin, Grand County, Colo., about 5 mi (8 km) southeast of Monarch Lake, in Precambrian metamorphic rocks consisting of migmatized gneiss and mixed gneiss and pegmatite. An intrusion of Precambrian Y Silver Plume Granite lies within 400 ft (122 m) of the occurrence. The...
The study of fresh-water lake ice using multiplexed imaging radar
Bryan M. Leonard, R.W. Larson
1975, Journal of Glaciology (14) 445-457
The study of ice in the upper Great Lakes, both from the operational and the scientific points of view, is receiving continued attention. Quantitative and qualitative field work is being conducted to provide the needed background for accurate interpretation of remotely sensed data. The data under discussion in this paper...
Fluid inclusion studies of vein, pipe, and replacement deposits, northwestern San Juan Mountains, Colorado
J. Thomas Nash
1975, Economic Geology (70) 1448-1462
Base and precious metal ores valued in excess of $300 million have been mined from vein, pipe, and replacement deposits located on the northwest side of, and structurally related to, the middle Tertiary Silverton caldera. A belt of normal faults radial to the caldera contains veins which have been mined...
Geochemical studies in the Park City district; II, Sulfide mineralogy and minor-element chemistry, Mayflower mine
J. Thomas Nash
1975, Economic Geology (70) 1038-1049
Fissure-filling and replacement Pb-Zn-Cu-Au-Ag ores of the Mayflower mine occur in calcareous sedimentary and intrusive wall rocks over a vertical interval of 3,000 feet. The ores are exceptional in the district for their chalcopyrite and gold content and for the unusual associated gangue minerals anhydrite, chlorite, and hematite. High oxygen...
Index of flood maps for California prepared by the U.S. Geological Survey through 1974
John R. Crippen
1975, Open-File Report 1002-37
No abstract available....
Sources of suspended matter in waters of the Middle Atlantic Bight
Robert H. Meade, Peter L. Sachs, Frank T. Manheim, J.C. Hathaway, Derek Spencer
1975, Journal of Sedimentary Research (78) 171-188
Suspended matter collected in the Middle Atlantic Bight (the coastal segment of the United States between Cape Cod and Cape Hatteras) in September 1969 was predominantly organic: an average of 80% combustible organic matter in surface waters and 40)% near bottom. Total suspended concentrations decreased between the inner shelf and...
Cholinesterase (ChE) response and related mortality among birds fed ChE inhibitors
J. Larry Ludke, Elwood F. Hill, Michael P. Dieter
1975, Archives of Environmental Contamination and Toxicology (3) 1-21
Patterns of mortality and inhibition of brain and plasma ChE in birds treated with ChE inhibitors were studied in an attempt to determine the validity of using ChE activity as a monitoring and diagnostic technique. Analysis of brain ChE activity proved to be reliable for diagnosing and monitoring effects of...
Bishop ash: A widespread volcanic ash extended to southern California
Richard Merriam, James L. Bischoff
1975, Journal of Sedimentary Research (45) 207-211
No abstract available....
Geologic setting and chemical characteristics of hot springs in west-central Alaska
Thomas Miller, Ivan Barnes, William Wallace Patton Jr.
1975, Journal of Research of the U.S. Geological Survey (3) 149-162
Numerous hot springs occur in a variety of geologic provinces in west-central Alaska. Granitic plutons are common to all the provinces, and the hot springs are spatially associated with the contacts of these plutons. Of 23 hot springs whose bedrock geology is known, all are within 4.8 km (3 mi)...
Monitoring regional effects of high pressure injection of wastewater in a limestone aquifer
Glen L. Faulkner, Charles A. Pascale
1975, Groundwater (13) 197-208
More than 10 billion gallons (38 × 106 m3) of acid industrial liquid waste has been injected in about 11 years under high pressure into a saline-water-filled part of a limestone aquifer of low transmissivity between 1,400 and 1,700 feet (430 and 520 m) below land surface near Pensacola, Florida....
Pyrrolidone - a new solvent for the methylation of humic acid
R.L. Wershaw, D.J. Pinckney, S.E. Booker
1975, Journal of Research of the U.S. Geological Survey (3) 123-126
In the past, humic acid has been methylated by suspending it in a solution of diazomethane in diethyl ether, and degrading the partly methylated humic acid to release those parts of the molecule that were methylated. Only small fragments of the molecule have been identified by this technique. In the...
Blood analyses of wolf pups and their ecological and metabolic interpretation
U.S. Seal, L.D. Mech, V. Van Ballenberghe
1975, Journal of Mammalogy (56) 64-75
Blood samples were obtained from 32 wolf (Canis lupus) pups live-trapped over a three-year period in northern Minnesota. The results of 21 laboratory analyses of hematology and blood chemistry are tabulated and analyzed in terms of study area, age, sex, and year of collection. Mean values are compared to those...
