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Page 5493, results 137301 - 137325

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Design of exploration and minerals-data-collection programs in developing areas
E. D. Attanasi
1981, Socio-Economic Planning Sciences (15) 347-352
This paper considers the practical problem of applying economic analysis to designing minerals exploration and data collection strategies for developing countries. Formal decision rules for the design of government exploration and minerals-data-collection programs are derived by using a minerals-industry planning model that has been extended to include an exploration function....
Geology of central Lake Michigan
R. J. Wood, R. A. Paull, C. A. Wolosin, R. J. Friedel
1981, American Association of Petroleum Geologists Bulletin (65) 1621-1632
The geology beneath Lake Michigan between 43°00' and 44°00' N and between 86°30' and 87°40' W is interpreted from a synthesis of 1,700 km of continuous seismic reflection profile data, bathymetry, grab samples, and onshore surface and subsurface information.The continuous seismic reflection profiles and bathymetry provided information for maps of...
Anomalous chemical changes in well waters and possible relation to earthquakes
Chi-Yu King, William C. Evans, T. Presser, R.H. Husk
1981, Geophysical Research Letters (8) 425-428
Water level, temperature, salinity, electric conductivity, and pH have been measured periodically for several years at three water wells located along a 17-km segment of the San Andreas fault between San Juan Bautista and Cienega Winery in central California. Water samples were collected at the same...
Range extension of pink salmon (Oncorhynchus Gorbuscha) into the lower Great Lakes
L. Emery
1981, Fisheries (6) 7-19
In 1979, pink salmon (Oncorhynchus gorbuscha) completed expansion of their range from Lake Superior into each of the other four Great Lakes. Record numbers of pink salmon were observed during the 1979 spawning migrations into Lake Superior tributaries. Although the species was introduced into Lake Superior 24 years ago, movement into the...
Comparison of automated segmented-flow and discrete analyzers for the determination of nutrients in water
V.C. Marti, D.R. Hale
1981, Environmental Science & Technology (15) 711-713
Water samples with specific conductances ranging from 66 to 6950 ??mho/cm at 25 ??C were analyzed for ammonia-N (NH3-N), nitrate plus nitrite-N (NO3 + NO2-N), nitrite-N (NO2-N), and phosphate-P (PO4-P) by using both a "segmented-flow" analyzer and a "discrete" analyzer. Plots of the discrete vs. the segmented-flow results showed linear...
A review of regional mineral resource assessment methods
D.A. Singer, D.L. Mosier
1981, Economic Geology (76) 1006-1015
Over 100 papers on regional mineral resource assessment of nonfuels are classified according to method(s) used and form(s) of product in order to help identify possible methods for future assessments. Types of products that have been used include: tons of metal; tons of rock and associated grade; gross value; potential;...
Molecular carbon isotopic evidence for the origin of geothermal hydrocarbons
D.J. Des Marais, J.H. Donchin, N.L. Nehring, A.H. Truesdell
1981, Nature (292) 826-828
Previous interest in light hydrocarbons from geothermal systems has focused principally on the origin of the methane1 and the estimation of subsurface temperatures from the carbon isotopic content of coexisting methane and carbon dioxide1-3. Higher molecular weight hydrocarbons were first reported in gases from Yellowstone National Park4, and have since...
Factors affecting the partitioning of Cu, Zn and Pb in boulder coatings and stream sediments in the vicinity of a polymetallic sulfide deposit
L.H. Filipek, T. T. Chao, R.H. Carpenter
1981, Chemical Geology (33) 45-64
A sequential extraction scheme is utilized to determine the geochemical partitioning of Cu, Zn and Pb among hydrous Mn- and Fe-oxides, organics and residual crystalline silicates and oxides in the minus-80-mesh (< 0.18 mm) sediments and in boulder coatings from a stream in Lincoln County, Georgia (U.S.A.). The stream drains...
Blast dynamics at Mount St Helens on 18 May 1980
S. W. Kieffer
1981, Nature (291) 568-570
At 8.32 a.m. on 18 May 1980, failure of the upper part of the north slope of Mount St Helens triggered a lateral eruption ('the blast') that devastated the conifer forests in a sector covering ???500 km2 north of the volcano. I present here a steady flow model for the...
Herpesvirus salmonis: pathological changes in parenterally-infected rainbow trout, Salmo gairdneri Richardson, fry
K. Wolf, C. E. Smith
1981, Journal of Fish Diseases (4) 445-457
After fry of rainbow trout, Salmo gairdneri Richardson, had been infected parenterally with Herpesvirus salmonis, moribund or freshly dead specimens were examined histopathologically. The virus produced a generalized infection, the first signs of which appeared after 2–3 weeks. Visceral and respiratory organs and the heart showed major pathological...
Northwest margin of California continental borderland: Marine geology and tectonic evolution
J.K. Crouch
1981, American Association of Petroleum Geologists Bulletin (65) 191-218
The northwest margin of the California continental borderland consists mainly of two northwest-trending pre-Neogene lithologic belts blanketed by Miocene and younger strata. These belts, which are lithologically and structurally correlated with the Franciscan Complex and Great Valley sequence of northern California, are interpreted to represent facies corresponding to the subduction...
Gravity: 2-D anomaly
Donald N. Haines, D. L. Campbell
1981, Book chapter, Manual of geophysical hand-calculator programs
No abstract available....
Use of remote sensing for monitoring deforestation in tropical and subtropical latitudes
J. J. Talbot, Lawrence R. Pettinger
1981, Ciencia Interamericana (21) 63-71
Of the three types of remotely sensed data discussed here, Landsat data offers the greatest potential for monitoring broad changes in extensive tropical forest environments because of its low-cost, synoptic, repetitive coverage. Scientists from developing countries can choose from a variety of Landsat data classification techniques, thus enabling each country...
Whooping crane preyed upon by golden eagle
Ronald M. Windingstad, Harry E. Stiles, Roderick C. Drewien
1981, The Auk (98) 393-394
The Golden Eagle (Aquila chrysaetos) is the largest predatory bird in North America and is well known for its predatory abilities. Attacks have been reported on mammals such as whitetail jackrabbits (Lepus townsendi) (McGahan 1967, J. Wildl. Mgmt. 31: 496), pronghorn antelope (Antilocapra americana) (Bruhns 1970, Can. Field-Natur. 84: 301),...