Compositional evidence regarding the origins of rims on Semarkona chondrules
J. N. Grossman, J. T. Wasson
1987, Geochimica et Cosmochimica Acta (51) 3003-3011
The compositions of the interiors and abraded surfaces of 7 chondrules from Semarkona (LL3.0) were measured by neutron activation analysis. For nonvolatile elements, the lithophile and siderophile element abundance patterns in the surfaces are generally similar to those in the corresponding interiors. Siderophile and chalcophile concentrations are much higher in...
Gravity anomaly at a Pleistocene lake bed in NW Alaska interpreted by analogy with Greenland's Lake Taserssauq and its floating ice tongue
D.F. Barnes
1987, Journal of Geophysical Research Solid Earth (92) 8976-8984
A possible example of a very deep glacial excavation is provided by a distinctive gravity low located at the front of a valley glacier that once flowed into glacial Lake Aniuk (formerly Lake Noatak) in the western Brooks Range. Geologic and geophysical data suggest that sediments or ice filling a...
Probability theory versus simulation of petroleum potential in play analysis
R. A. Crovelli
1987, Annals of Operations Research (8) 363-381
An analytic probabilistic methodology for resource appraisal of undiscovered oil and gas resources in play analysis is presented. This play-analysis methodology is a geostochastic system for petroleum resource appraisal in explored as well as frontier areas. An objective was to replace an existing Monte Carlo simulation method in order to...
EFFECT OF AN ACID RAIN ENVIRONMENT ON LIMESTONE SURFACES.
Victor G. Mossotti, James R. Lindsay, Michael F. Hochella Jr.
1987, Materials Performance (26) 47-52
Salem limestone samples were exposed to weathering for 1 y in several urban and one rural environments. Samples exposed in the rural location were chemically indistinguishable from the freshly quarried limestone, whereas all samples collected from urban exposure sites developed gypsum stains on the ground-facing surfaces where the stones were...
Evaluation of the stability of gas hydrates in Northern Alaska
A. Kamath, S. P. Godbole, R. D. Ostermann, T. S. Collett
1987, Cold Regions Science and Technology (14) 107-119
The factors which control the distribution of in situ gas hydrate deposits in colder regions such as Northern Alaska include; mean annual surface temperatures (MAST), geothermal gradients above and below the base of permafrost, subsurface pressures, gas composition, pore-fluid salinity and the soil condition. Currently existing data on the above...
Analysis of two-color geodimeter measurements of deformation within the Long Valley caldera: June 1983 to October 1985
J. Langbein, M. Linker, D. Tupper
1987, Journal of Geophysical Research Solid Earth (92) 9423-9442
Line length changes from several baselines in a trilateration network within the Long Valley caldera clearly define a decrease in strain rate from June 1983 through October 1985. The data consist of more than 1600 length measurements on 23 baselines using a two-color geodimeter, which has a precision of 0.2...
Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire
T.M. Harrison, J. N. Aleinikoff, W. Compston
1987, Geochimica et Cosmochimica Acta (51) 2549-2558
U-Pb analyses of zircons separated from two Concord-type plutons near Sunapee and Dixville Notch, New Hampshire, reveal differences in the pattern and magnitude of zircon inheritance which are related to differences in melt chemistry. The Sunapee pluton contains only slightly more Zr than required to saturate the melt at the...
On regional geomagnetic charts
L.R. Alldredge
1987, Journal of Geomagnetism & Geoelectricity (39) 723-738
When regional geomagnetic charts for areas roughly the size of the United States were compiled by hand, some large local anomalies were displayed in the isomagnetic lines. Since the late nineteen sixties, when the compilation of charts using computers and mathematical models was started, most of the details...
Moment tensor solutions estimated using optimal filter theory for 51 selected earthquakes, 1980-1984
S.A. Sipkin
1987, Physics of the Earth and Planetary Interiors (47) 67-79
The 51 global events that occurred from January 1980 to March 1984, which were chosen by the convenors of the Symposium on Seismological Theory and Practice, have been analyzed using a moment tensor inversion algorithm (Sipkin). Many of the events were routinely analyzed as part of the National Earthquake Information...
Diffusivity of a glacial-outwash aquifer by the floodwave- response technique
R.J. Reynolds
1987, Groundwater (25) 290-299
Aquifer diffusivity (transmissivity divided by storage coefficient) was calculated for three sites in a glacial-autwash valley aquifer near Cortland, New York from water-level fluctuations induced by rises in stream stage. The observed response data were analyzed through use of a one-dimensional floodwave-response model to calculate the theoretical head response in...
Transport of reacting solutes subject to a moving dissolution boundary: Numerical methods and solutions
Catherine Willis, Jacob Rubin
1987, Water Resources Research (23) 1561-1574
A moving boundary problem which arises during transport with precipitation-dissolution reactions is solved by three different numerical methods. Two of these methods (one explicit and one implicit) are based on an integral formulation of mass balance and lead to an approximation of a weak solution. These methods are compared to...
Earthquakes, May-June 1987
W. J. Person
1987, Earthquakes & Volcanoes (USGS) (19) 110-112
There were no major earthquakes (7.0-7.9) during this reporting period but earthquake related deaths were reported in Italy, Iran, and the Philippine Islands. In the United States a moderate earthquake occurred in southern Illinois and caused some damage. ...
Picture windows of opportunity
S. Matt
1987, Earthquakes & Volcanoes (USGS) (19) 174-177
We hate to say that we need a moderate earthquake every once in a while, but experience shows that it surely helps to sell all kinds of seismic safety programs It took the 933 Long Beach earthquake to get the Field Act passed in California requiring the strengthening of our public schools. It...
Some effects of climate variability on hydrology in western North America
D. H. Peterson, D.R. Cayan, J. S. Dileo-Stevens, T.G. Ross
1987, Conference Paper, The influence of climate change and climatic variability on the hydrologic regime and water resources (Proceedings of the Vancouver Symposium, August 1987), IAHS Publication no. 168
The strong north-south gradient in precipitation along the West Coast makes this region an interesting laboratory for studying the influence of climate on runoff variability in general and riverine chemistry in particular. Interannual fluctuations in large-scale atmospheric circulation and associated precipitation and runoff can produce major disruptions in the "average"...
Use of slope, aspect, and elevation maps derived from digital elevation model data in making soil surveys
A. A. Klingebiel, E. H. Horvath, D. G. Moore, W.U. Reybold
1987, Book chapter, Soil survey techniques, SSSA Special Publication 20
Maps showing different classes of slope, aspect, and elevation were developed from U.S. Geological Survey digital elevation model data. The classes were displayed on clear Mylar at 1:24 000-scale and registered with topographic maps and orthophotos. The maps were used with aerial photographs, topographic maps, and other resource data to...
Predicting baseflow alkalinity as an index to episodic stream acidification and fish presence
David R. DeWalle, Richard S. Dinicola, William E. Sharpe
1987, Journal of the American Water Resources Association (23) 29-35
Regression models to predict baseflow alkalinity from basin hydrogeology were developed and verified for headwater streams on the Laurel Hill anticline in southwestern Pennsylvania. Predicted baseflow alkalinities were then used to estimate sensitivity to acidification and presence of trout (Salvelinus fontinalis) populations for 61 headwater streams. Sensitivity classifications were verified...
[Book review] The geochronology and evolution of Africa
Frederic H. Wilson
1987, Precambrian Research (36) 181-182
This book was written 'to provide an up-to-date data bank from which those wishing to construct models concerned with the evolution of Africa .... can draw.' As such, it attempts a survey of 'integrated geology and geochronology' of the African continent throughout the Precambrian and into the Phanerozoic. Political and...
An empirical model for estimating phytoplankton productivity in estuaries
B.E. Cole, J. E. Cloern
1987, Marine Ecology Progress Series (396) 299-305
e have previously shown that primary productivity in San Francisco Bay, USA, is highly correlated with phytoplankton biomass B (chlorophyll a concentration) and an index of light avallability in the photic zone, 2, I, (photic depth times surface irradiance). To test the generality of this relation, we compiled data from...
A compositional multiphase model for groundwater contamination by petroleum products: 1. Theoretical considerations
M. Yavuz Corapcioglu, Arthur L. Baehr
1987, Water Resources Research (23) 191-200
A mathematical model is developed to describe the fate of hydrocarbon constituents of petroleum products introduced to soils as an immiscible liquid from sources such as leaking underground storage tanks and ruptured pipelines. The problem is one of multiphase transport (oil (immiscible), air, and water phases) of a reactive contaminant...
Behavioral modification of reproduction in coyotes
D. A. Barnum, J.T. Flinders, J.S. Green
J.S. Green, editor(s)
1987, Protecting livestock from coyotes. A synopsis of research of the Agricultural Research Service. 10-29
No abstract available at this time...
Using a spatial and tabular database to generate statistics from terrain and spectral data for soil surveys
E.A. Horvath, E. A. Fosnight, A. A. Klingebiel, D. G. Moore, J.E. Stone
W.U. Reybold, G.W. Petersen, editor(s)
1987, Book chapter, Soil survey techniques, SSSA Special Publication 20
A methodology has been developed to create a spatial database by referencing digital elevation, Landsat multispectral scanner data, and digitized soil premap delineations of a number of adjacent 7.5-min quadrangle areas to a 30-m Universal Transverse Mercator projection. Slope and aspect transformations are calculated from elevation data and grouped according...
Aquatic ecoregions of the conterminous United States
J.M. Omernick
1987, Report
Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987). This is a copy of the ecoregion coverage of Omernik (1987) with some item names modified. This is NOT the most recent...
Alaska interim land cover mapping program
Water Resources Division, U.S. Geological Survey
1987, Data Users Guide 7
In order to meet the requirements of the Alaska National Interest Lands Conservation Act (ANILCA) for comprehensive resource and management plans from all major land management agencies in Alaska, the USGS has begun a program to classify land cover for the entire State using Landsat digital data. Vegetation and land...
Calculation of solar radiation in mountainous terrain
Alan L. Flint, S.W. Childs
1987, Agricultural and Forest Meteorology (40) 233-249
A study was performed to assess the accuracy of a daily solar radiation model for horizontal or sloping sites in terrain where surrounding ridges and tall trees block both direct beam and diffuse sky short wave radiation. To simulate adequately the major effects of these environments on radiation, the model...
Resource assessments, geologic deposit models, and offshore minerals with an example of heavy-mineral sands
Emil D. Attanasi, J. H. DeYoung, E. R. Force, Andrew Grosz
P. G. Teleki, M.R. Dobson, Jeffrey R. Moore, von Stackelberg U., editor(s)
1987, Book chapter, Marine minerals
A resource assessment method for offshore minerals based on descriptive and grade-tonnage models is proposed. Historical development and applications of this method are summarized. Based on this approach, descriptive and quantitative deposit models for strand-line titanium placer deposits have been developed. Descriptive statistics were also computed using the worldwide deposit...
