Actualistic models of mantle metasomatism documented in a composite xenolith from Dish Hill, California
J. E. Nielson, J. R. Budahn, D.M. Unruh, H. G. Wilshire
1993, Geochimica et Cosmochimica Acta (57) 105-121
Major and trace-element whole rock and mineral variations in composite hornblendite-peridotite xenolith Ba-2-1, from Dish Hill, CA, are due to a single event of metasomatism in the mantle. The hornblendite is the crystallized selvage of a dike conduit charged with incompatible-element-enriched hydrous mafic magma. The magma infiltrated the refractory peridotite...
Deposition of Franciscan Complex cherts along the paleoequator and accretion to the American margin at tropical paleolatitudes
J.T. Hagstrum, B.L. Murchey
1993, Geological Society of America Bulletin (105) 766-778
Red radiolarian cherts from three localities within the Franciscan subduction complex of northern California contain three components of remanent magnetization which are best isolated by progressive thermal demagnetization. The first component, usually removed by 300 °C, has an in situ direction similar to the present...
Corrosiveness of ground water in the Kirkwood-Cohansey aquifer system of the New Jersey Coastal Plain
J. L. Barringer, G. R. Kish, A. J. Velnich
1993, Water-Resources Investigations Report 90-4180
Ground water from the unconfined part of the Kirkwood-Cohansey aquifer system in the New Jersey Coastal Plain typically is corrosive-- that is, it is acidic, soft, and has low concentrations of alkalinity. Corrosive ground water has the potential to leach trace elements and asbestos fibers from plumbing materials used...
Ground-water withdrawals, water levels, and ground-water quality in the Houston district, Texas, with emphasis on 1985-89
D.L. Barbie, G.L. Locke
1993, Water-Resources Investigations Report 92-4180
This report is one in a series of reports prepared by the U.S. Geological Survey, beginning in 1937, on the ground-water resources in the Houston district. The Houston district includes Harris and Galveston Counties, and parts of Brazoria, Fort Bend, Waller, Montgomery, Liberty, and Chambers Counties. The primary emphasis of...
Maps, data, and GRASS in Yosemite National Park
J. W. van Wagtendonk
1993, Technical Report NPS/NRGISD/NRTR-93/13
No abstract available at this time...
Patterns of orographic uplift in the Sierra Nevada and their relationship to upper-level atmospheric circulation
Edward Aguado, Daniel R. Cayan, Brian D. Reece, Larry Riddle
1993, Conference Paper, Proceedings of the ninth annual pacific climate (PACLIM) workshop
We examine monthly and seasonal patterns of precipitation across various elevations of the eastern Central Valley of California and the Sierra Nevada. A measure of the strength of the orographic effect called the “precipitation ratio” is calculated, and we separate months into four groups based on being wet or dry...
Great Basin NP and USGS cooperate on a geologic mapping program
Janet L. Brown, Vidal Davila Jr.
1993, Park Science (13) 6-7
The GRBA draft General Management Plan proposes development in several locations in Kious Spring and Lehman Caves 1:24,000 topographic quadrangles, and these proposed developments need geologic evaluation before construction. Brown will act as project manager to coordinate the IA with time frames, budget constraints, and the timely preparation of required...
Energy budget for yearling lake trout, Salvelinus namaycush
Donald V. Rottiers
1993, Journal of Freshwater Ecology (8) 319-327
Components of the energy budget of yearling lake trout (Salvelinus namacush) were derived from data gathered in laboratory growth and metabolism studies; values for energy lost as waste were estimated with previously published equations. Because the total caloric value of food consumed by experimental lake trout was...
New geothermal database for Utah
Robert E. Blackett
Anon, editor(s)
1993, Conference Paper, Transactions - Geothermal Resources Council
The Utah Geological Survey complied a preliminary database consisting of over 800 records on thermal wells and springs in Utah with temperatures of 20??C or greater. Each record consists of 35 fields, including location of the well or spring, temperature, depth, flow-rate, and chemical analyses of water samples. Developed for...
Gas buildup in Lake Nyos, Cameroon: The recharge process and its consequences
William C. Evans, G.W. Kling, M. L. Tuttle, G. Tanyileke, L. D. White
1993, Applied Geochemistry (8) 207-221
The gases dissolved in Lake Nyos, Cameroon, were quantified recently (December 1989 and September 1990) by two independent techniques: in-situ measurements using a newly designed probe and laboratory analyses of samples collected in pre-evacuated stainless steel cylinders. The highest concentrations of CO2 and CH4 were...
Prediction by regression and intrarange data scatter in surface-process studies
T.J. Toy, W. R. Osterkamp, K.G. Renard
1993, Environmental Geology (22) 121-128
Modeling is a major component of contemporary earth science, and regression analysis occupies a central position in the parameterization, calibration, and validation of geomorphic and hydrologic models. Although this methodology can be used in many ways, we are primarily concerned with the prediction of values for one variable from another...
Oblique synoptic images, produced from digital data, display strong evidence of a "new" caldera in southwestern Guatemala
W. Duffield, G. Heiken, D. Foley, A. McEwen
1993, Journal of Volcanology and Geothermal Research (55) 217-224
The synoptic view of broad regions of the Earth's surface as displayed in Landsat and other satellite images has greatly aided in the recognition of calderas, ignimbrite plateaus and other geologic landforms. Remote-sensing images that include visual representation of depth are an even more powerful tool for geologic interpretation of...
Evaluation of the energy budget method of determining evaporation at Williams Lake, Minnesota, using alternative instrumentation and study approaches
D.O. Rosenberry, A.M. Sturrock, T. C. Winter
1993, Water Resources Research (29) 2473-2483
Best estimates of evaporation at Williams Lake, north central Minnesota, were determined by the energy budget method using optimum sensors and optimum placement of sensors. These best estimates are compared with estimates derived from using substitute data to determine the effect of using less accurate sensors, simpler methods, or remotely...
Quality control and quality assurance plan for bridge channel-stability assessments in Massachusetts
Gene W. Parker, Harlow Pinson
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A quality control and quality assurance plan has been implemented as part of the Massachusetts bridge scour and channel-stability assessment program. This program is being conducted by the U.S. Geological Survey, Massachusetts-Rhode Island District, in cooperation with the Massachusetts Highway Department. Project personnel training, data-integrity verification, and new data-management technologies...
Management and analysis of water-use data using a geographic information system
K. E. Juracek, J. F. Kenny
1993, Water Resources Bulletin (29) 973-979
As part of its mission, the U.S. Geological Survey conducts water-resources research. Site-specific and aggregate water-use data are used in the Survey's National Water-Use Information Program and in various hydrologic investigations. Both types of activities have specific requirements in terms of water-use data access, analysis, and display. In Kansas, the...
In my experience: Mitochondrial DNA in wildlife taxonomy and conservation biology: Cautionary notes
Matthew A. Cronin
1993, Wildlife Society Bulletin (21) 339-348
Several recently published papers discussed the importance of systematics (the study of evolutionary and genetic relationships among organisms) and taxonomy (the naming and classification of organisms) for managing wildlife (Ryder 1986, Avise 1989, Amato 1991, O'Brien and Mayr 1991, Dowling et al. 1992), Often, classification below the species level is...
Relationship of geological and geothermal field properties: Midcontinent area, USA, an example
A. Forster, D. F. Merriam, J.C. Brower
1993, Mathematical Geology (25) 937-947
Quantitative approaches to data analysis in the last decade have become important in basin modeling and mineral-resource estimation. The interrelation of geological, geophysical, geochemical, and geohydrological variables is important in adjusting a model to a real-world situation. Revealing the interdependences of variables can contribute in understanding the processes interacting in...
Distribution of stable isotopes in ground water in the Rialto-Colton basin, California
Linda R. Woolfenden
1993, Conference Paper, Management of Irrigation and Drainage Systems : Integrated Perspectives
Since 1982, imported water originating in the Sierra Nevada has been used to recharge the Rialto-Colton ground-water basin, about 100 km east of Los Angeles. Stable isotopes of oxygen (oxygen-18) and hydrogen (deuterium) were used to determine the disposition of artificially recharged, imported water within the basin. Delta oxygen-18 ratios...
A geochemical atlas of North Carolina, USA
J.C. Reid
1993, Journal of Geochemical Exploration (47) 11-27
A geochemical atlas of North Carolina, U.S.A., was prepared using National Uranium Resource Evaluation (NURE) stream-sediment data. Before termination of the NURE program, sampling of nearly the entire state (48,666 square miles of land area) was completed and geochemical analyses were obtained.The NURE data are applicable to mineral exploration, agriculture,...
Interactions between ground water and wetlands, southern shore of Lake Michigan, USA
Robert J. Shedlock, Douglas A. Wilcox, Todd A. Thompson, David A. Cohen
1993, Journal of Hydrology (141) 127-155
Wetlands between, and within, dune-beach complexes along the south shore of Lake Michigan are strongly affected by ground water. The hydrogeology of the glacial drift aquifer system in a 26 km2 area was investigated to determine the effects of ground water on the hydrology and hydrochemistry of Cowles Bog and its...
The susceptibility of rock slopes to earthquake-induced failure
D. K. Keefer
1993, Bulletin of the Association of Engineering Geologists (30) 353-361
Faulure of rock slopes is a major cause of damage and casualties during moderate and strong earthquakes. This article presents a method for assessing the seismic stability of rock slopes, which can be applied on a regional scale, using data from existing maps, reports, aerial photographs, and reconnaissance-level field observations....
Application of borehole geophysics in defining the wellhead protection area for a fractured crystalline bedrock aquifer
J.H. Vernon, F.L. Paillet, W.H. Pedler, W.J. Griswold
1993, Log Analyst (34) 41-57
Wellbore geophysical techniques were used to characterize fractures and flow in a bedrock aquifer at a site near Blackwater Brook in Dover, New Hampshire. The primary focus ofthis study was the development of a model to assist in evaluating the area surrounding a planned water supply well where contaminants introduced...
An earth remote sensing satellite- 1 Synthetic Aperture Radar Mosaic of the Tanana River Basin in Alaska
Charles E. Wivell, Coert Olmsted, Daniel R. Steinwand, Christopher Taylor
1993, Photogrammetric Engineering and Remote Sensing (59) 527-528
Because the pixel location in a line of Synthetic Aperture Radar (SAR) image data is directly related to the distance the pixel is from the radar, terrain elevations cause large displacement errors in the geo-referenced location of the pixel. This is especially true for radar systems with small angles between...
Simulation and mapping of soil-water conditions in the Great Plains
R. B. Zelt, J. T. Dugan
1993, Water Resources Bulletin (29) 939-948
Soil-water conditions provide valuable insight into the hydrologic system in an area. A soil-water balance quantitatively summarizes soil-water conditions and is based on climatic, soil, and vegetation characteristics that vary spatially and temporally. Soil-water balances in the Great Plains of the central United States were simulated for 1951-1980. Results of...
A model of the productivity of the northern pintail
J.D. Carlson Jr., W.R. Clark, Erwin E. Klaas
1993, Biological Report 7
We adapted a stochastic computer model to simulate productivity of the northern pintail (Anas acuta). Researchers at the Northern Prairie Wildlife Research Center of the U.S. Fish and Wildlife Service originally developed the model to simulate productivity of the mallard (A. platyrhynchos). We obtained data and descriptive information on the...
