Age and origin of anorthosites, charnockites, and granulites in the Central Virginia Blue Ridge: Nd and Sr isotopic evidence
H.S. Pettingill, A.K. Sinha, M. Tatsumoto
1984, Contributions to Mineralogy and Petrology (85) 279-291
Rb-Sr isotopic data for anorthosites, charnockites, ferrodioritic to quartz monzonitic plutons, and high-grade gneisses of the Blue Ridge of central Virginia show evidence of post-emplacement metamorphism, but in some cases retain Grenville ages. The Pedlar River Charnockite Suite yields an isochron age of 1021 +/-36 Ma, (initial 87Sr/86Sr ratio of...
Chemical determination of particulate nitrogen in San Francisco Bay. Nitrogen: chlorophyll a ratios in plankton
S.W. Hager, D.D. Harmon, A.E. Alpine
1984, Estuarine, Coastal and Shelf Science (19) 193-204
Particulate nitrogen (PN) and chlorophyll a (Chla) were measured in the northern reach of San Francisco Bay throughout 1980. The PN values were calculated as the differences between unfiltered and filtered (0·4 μm) samples analyzed using the UV-catalyzed peroxide digestion method. The Chla values were measured spectrophotometrically, with corrections made for phaeopigments. The...
Feasibility of saltwater gradient ponds as a heat supply for hatchery rearing water
J. T. Fuss
1984, Aquacultural Engineering (3) 31-37
Salt gradient solar collector ponds are economically feasible as a source of heat energy for hatchery rearing water. A pond 3 m deep and covering an area of 5000 m2 will supply approximately 2800 GJ of energy over a three-month period — enough for a one-year smolt program in an Atlantic...
Problems on the Upper Mississippi River and its tributaries: Need for a long-term resource monitoring program
G. A. Jackson, C. E. Korschgen, P. A. Thiel, J. Besser
J.C. Wiener, R.V. Anderson, D.R. McConville, editor(s)
1984, Book chapter, Contaminants in the Upper Mississippi River
No abstract available....
Inter-pulse high-resolution gamma-ray spectra using a 14 MeV pulsed neutron generator
L.G. Evans, J.I. Trombka, D.H. Jensen, W.A. Stephenson, R. A. Hoover, J.L. Mikesell, A.B. Tanner, F. E. Senftle
1984, Nuclear Instruments and Methods In Physics Research (219) 233-242
A neutron generator pulsed at 100 s-1 was suspended in an artificial borehole containing a 7.7 metric ton mixture of sand, aragonite, magnetite, sulfur, and salt. Two Ge(HP) gamma-ray detectors were used: one in a borehole sonde, and one at the outside wall of the sample tank opposite the neutron...
U. S. GEOLOGICAL SURVEY'S RESEARCH PROGRAM IN THE NEWLY PROCLAIMED EXCLUSIVE ECONOMIC ZONE.
Gary Hill
1984, Conference Paper, Technical Papers of the American Congress of Surveying and Mapping
The U. S. Geological Survey (USGS) has been developing a program which would emphasize broad-scale surveys of the continental margin and intensive studies of 'baseline corridors' in various areas of the U. S. EEZ to gather energy and mining information in this new frontier as quickly as possible. Of twelve...
Multilocus electrophoretic assessment of the genetic structure and diversity of Yersinia ruckeri
W. B. Schill, S.R. Phelps, S. W. Pyle
1984, Applied and Environmental Microbiology (48) 975-979
Multilocus isoenzyme electrophoresis was used to screen 47 field isolates of Yersinia ruckeri for electrophoretic variation at 15 enzyme loci. Only four electrophoretic types were observed, thus indicating that the genetic structure of Y. ruckeri is clonal. Forty-two isolates were of one electrophoretic type, a reflection of the low amount of genetic diversity extant...
ANALYSIS OF A CLASSIFICATION ERROR MATRIX USING CATEGORICAL DATA TECHNIQUES.
George H. Rosenfield, Katherine Fitzpatrick-Lins
1984, Conference Paper
Summary form only given. A classification error matrix typically contains tabulation results of an accuracy evaluation of a thematic classification, such as that of a land use and land cover map. The diagonal elements of the matrix represent the counts corrected, and the usual designation of classification accuracy has been...
Analytical results and sample localities of rock, stream sediment and oxalic-acid-soluble fraction of stream-sediment samples from the Ten Lakes Wilderness Study Area, Lincoln County, Montana
R. W. Leinz, D. F. Siems, B. F. Arbogast, C. M. McDougal
1984, Open-File Report 86-429
No abstract available....
The Piedmont landscape of Maryland: a new look at an old problem.
J. E. Costa, E.T. Cleaves
1984, Earth Surface Processes and Landforms (9) 59-74
Both equilibrium and episodic erosion features can be recognized in the modern landscape. An equilibrium condition is suggested by adjustment of first and second order streams to rock structure and lithology, entrenchment of some streams against gneiss domes, altitudinal zonation of rock types around gneiss domes, correlation of lithology with...
A Model of Regional Ground-Water Flow in Secondary-Permeability Terrane
J. M. Gerhart
1984, Groundwater (22) 168-175
The ground-water flow system in the Lower Susquehanna River Basin in Pennsylvania and Maryland can be considered as one complex unconfined aquifer in which secondary porosity and permeability are the dominant influences on the occurrence and flow of ground water. The degree of development of...
Applied cartographic communication: map symbolization for atlases.
J. L. Morrison
1984, Cartographica: The International Journal for Geographic Information and Geovisualization (21) 44-84
A detailed investigation of the symbolization used on general-purpose atlas reference maps. It indicates how theories of cartographic communication can be put into practice. Two major points emerge. First, that a logical scheme can be constructed from existing cartographic research and applied to an analysis of the choice of symbolization...
Accelerator radiocarbon dating of evidence for prehistoric horticulture in Illinois
N. Conard, D.L. Asch, N.B. Asch, D. Elmore, H. Gove, M. Rubin, J.A. Brown, M.D. Wiant, K.B. Farnsworth, T.G. Cook
1984, Nature (308) 443-446
With the development of direct detection radiocarbon dating, which uses an accelerator as part of a highly selective mass spectrometer, it is now possible to determine the age of milligram samples of organic materials1-5. One application of accelerator dating is in evaluating scanty, sometimes controversial evidence for early horticulture throughout...
Elk and deer diets in old-growth forests in western Washington
David M. Leslie Jr., Edward E. Starkey, Martin Vavra
1984, Journal of Wildlife Management (48) 762-775
Dietary quality and overlap of sympatric Roosevelt elk (Cervus elaphus roosevelti) and Columbian black-tailed deer (Odocoileus hemionus columbianus) were investigated in old-growth forests of the Hoh Valley, Olympic National Park, Washington. Diets of both cervids were comprised mainly of common old-growth flora, particularly in winter. High dietary overlap suggested competitive...
ORIGIN OF QUARTZ IN COAL.
Leslie F. Ruppert, C. Blaine Cecil, Ronald W. Stanton
1984, Conference Paper, ACS Division of Fuel Chemistry, Preprints
Both a scanning electron microscope and an electron microprobe (EMP) were used in this study to analyze the cathodoluminescence properties of quartz grains in samples of the Upper Freeport coal bed because quartz grains in coal are small (silt sized) and below the resolution capabilities of a standard luminoscope. Quartz...
Methods of Fitting a Straight Line to Data: Examples in Water Resources
Robert M. Hirsch, Edward J. Gilroy
1984, Water Resources Bulletin (20) 705-711
Three methods of fitting straight lines to data are described and their purposes are discussed and contrasted in terms of their applicability in various water resources contexts. The three methods are ordinary least squares (OLS), least normal squares (LNS), and the line of organic correlation (OC). In all three methods...
Map showing outcrops of pre-Quaternary ash-flow tuffs and volcaniclastic rocks, Basin and Range province, Arizona
J. E. Jenness, D. A. Lopez, J. R. LaFortune
1984, Water-Resources Investigations Report 83-4114-F
No abstract available....
Modification of wave-cut and faulting-controlled landforms
Thomas C. Hanks, R.C. Bucknam, K. R. Lajoie, R. E. Wallace
1984, Journal of Geophysical Research Solid Earth (89) 5771-5790
From a casual observation that the form of degraded fault scarps resembles the error function, this investigation proceeds through an elementary diffusion equation representation of landform evolution to the application of the resulting equations to the modern topography of scarplike landforms. The morphologic observations can be analyzed either in the...
The impact of uncertainties in hydrologic measurement on phosphorus budgets and empirical models for two Colorado reservoirs.
James W. LaBaugh, T. C. Winter
1984, Limnology and Oceanography (29) 322-339
Water budgets and related chemical budgets of aquatic ecosystems commonly are interpreted without reference to uncertainties resulting from errors of measurement. The importance of such uncertainties in the use and interpretation of the phosphorus budgets of two Colorado reservoirs was determined....
Evaporation from flowing channels
J.M. Fulford, T.W. Sturm
1984, Journal of Energy Engineering - ASCE (110) 1-9
Stability‐dependent and Dalton‐type mass transfer formulas are determined from experimental evaporation data in ambient and heated channels and are shown to have similar performance in prediction of evaporation. The formulas developed are compared with those proposed by other investigators for lakes and flowing channels. The evaporation data were obtained from...
Hydrogeochemistry of Big Soda Lake, Nevada: An alkaline meromictic desert lake
Y.K. Kharaka, S.W. Robinson, LeRoy M. Law, W.W. Carothers
1984, Geochimica et Cosmochimica Acta (48) 823-835
Big Soda Lake, located near Fallon, Nevada, occupies an explosion crater rimmed by basaltic debris; volcanic activity apparently ceased within the last 10,000 years. This lake has been selected for a detailed multidisciplinary study that will ultimately cover the organic and inorganic hydrogeochemistry of water and sediments because the time...
Effect of organic contamination upon microbial distributions and heterotrophic uptake in a Cape Cod, Massachusetts, aquifer
R.W. Harvey, R. L. Smith, L. George
1984, Applied and Environmental Microbiology (48) 1197-1202
No abstract available....
Deformation, geochemistry, and origin of massive sulfide deposits, Gossan lead district, Virginia
J. E. Gair, J. F. Slack
1984, Economic Geology (79) 1483-1520
The Gossan Lead district is a 28-km-long, northeast-trending belt of discontinuous massive sulfide deposits in the Blue Ridge province of southwestern Virginia. The deposits, hosted by the Ashe Formation of late Proterozoic age, consist of strata-bound lenses and layers of massive pyrrhotite, minor chalcopyrite, sphalerite, and pyrite, and rare arsenopyrite...
MINERALOGICAL STUDIES OF THE HYDROTHERMAL SYSTEM IN NEWBERRY VOLCANO DRILL HOLE 2, OREGON.
Terry E.C. Keith, Keith E. Bargar, Stephen S. Howe, William W. Carothers, Ivan Barnes
1984, Conference Paper, Transactions - Geothermal Resources Council
Studies of secondary mineral distribution, whole-rock chemical compositions, isotopes, and fluid inclusions are being conducted on the core from Newberry Volcano drill hole 2. Rocks from the drill core are divided into 3 major intervals on the basis of their alteration pattern, which is controlled by rock permeabilities, primary lithologies,...
PROJECTED EFFECTS OF GROUND-WATER DEVELOPMENT IN THE SOUTHERN HIGH PLAINS OF TEXAS AND NEW MEXICO.
Richard R. Luckey
1984, Conference Paper, Proceedings - AWWA Annual Conference
A digital ground-water flow model of the southern High Plains of Texas and New Mexico has been constructed. The calibrated model with the 1980 water level as the initial condition was used to project water levels to 2020. Estimated future pumpage based on the U. S. Economic Development Administration's economic...
