Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska
G.K. Czamanske, G. R. Himmelberg, F.E. Goff
1976, Earth and Planetary Science Letters (33) 111-118
Zoned spinel of unusual composition and morphology has been found in massive pyrrhotite-chalcopyrite-pent-landite ore from the La Perouse layered gabbro intrusion in the Fairweather Range, southeastern Alaska. The spinel grains show continuous...
Effect of pH on exchange-adsorption or precipitation of lead from landfill leachates by clay minerals
R. A. Griffin
1976, Environmental Science & Technology (10) 1256-1261
No abstract available....
Diamonds in an upper mantle peridotite nodule from kimberlite in southern wyoming
M. E. McCallum, D.H. Eggler
1976, Science (192) 253-256
Diamonds in a serpentinized garnet peridotite nodule from a diatreme in southern Wyoming are the first known occurrence in an upper mantle peridotite xenolith from a kimberlite intrusion in North America as well as the second authenticated occurrence of diamonds from kimberlite pipes in North America. The nodule is believed...
Instrumental activation analysis of coal and fly ash with thermal and epithermal neutrons and short-lived nuclides
E. Steinnes, J.J. Rowe
1976, Analytica Chimica Acta (87) 451-462
Instrumental neutron activation analysis is applied to the determination of about 25 elements in coals and fly ash by means of nuclides with half-lives of less than 48 h ; thermal and epithermal irradiations are used. The results indicate that epithermal activation is preferable for twelve of the elements (Ga,...
RESIN, a FORTRAN IV program for determining the area of influence of samples or drill holes in resource target search
D.A. Singer
1976, Computers & Geosciences (2) 249-260
A FORTRAN IV program that calculates the area of influence of drill holes or samples with respect to the size and shape of elliptical or circular resource targets is presented. Program options include determination of the degree to which areas within a region have been explored and estimation of probabilities...
A note on the effect of fault gouge thickness on fault stability
J. Byerlee, R. Summers
1976, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (13) 35-36
At low confining pressure, sliding on saw cuts in granite is stable but at high pressure it is unstable. The pressure at which the transition takes place increases if the thickness of the crushed material between the sliding surfaces is increased. This experimental result suggests that on natural faults the...
A study of alternative schemes for extrapolation of secular variation at observatories
L.R. Alldredge
1976, Physics of the Earth and Planetary Interiors (11)
The geomagnetic secular variation is not well known. This limits the useful life of geomagnetic models. The secular variation is usually assumed to be linear with time. It is found that attenative schemes that employ quasiperiodic variations from internal and external sources can improve the extrapolation of secular variation at...
Distribution of small channels on the Martian surface
D. Pieri
1976, Icarus (27) 25-50
The distribution of small channels on Mars has been mapped from Mariner 9 images, at the 1:5 000 000 scale, by the author. The small channels referred to here are small valleys ranging in width from the resolution limit of the Mariner 9 wide-angle images (???1 km) to about 10...
Morphologic interpretation of fertile structures in glossopterid gymnosperms
J.M. Schopf
1976, Review of Palaeobotany and Palynology (21) 25-64
The problem of determining affinity among glossopterid gymnosperms is beset by deficiencies in preservation, natural dissociation of parts, and scarcity of features assuredly critical for morphologic comprarison. The glossopterids probably are not a very heterogeneous group of plants, but this is difficult to prove. The Gondwana glacial "hiatus" has resulted...
Dinoflagellates: Fossil motile-stage tests from the upper cretaceous of the Northern New Jersey coastal plain
F.E. May
1976, Science (193) 1128-1130
Fossil dinoflagellate tests have been considered to represent encysted, nonmotile stages. The discovery of flagellar porelike structures and probable trichocyst pores in the Upper Cretaceous genus Dinogymnium suggests that motile stage tests are also preserved as acid-resistant, organic-walled microfossils....
Search for the Viking 2 landing site
H. Masursky, N.L. Crabill
1976, Science (194) 62-68
The search for the landing site of Viking 2 was more extensive than the search for the Viking 1 site. Seven times as much area (4.5 million square kilometers) was examined as for Viking 1. Cydonia (B1) and Capri (C1) sites were examined with the Viking 1 orbiter. The B...
Progress in remote sensing (1972-1976)
W. A. Fischer, W. R. Hemphill, Allan Kover
1976, Photogrammetria (32) 33-72
This report concerns the progress in remote sensing during the period 1972–1976. Remote sensing has been variously defined but is basically the art or science of telling something about an object without touching it. During the past four years, the major research thrusts have been in three areas: (1) computer-assisted enhancement and...
Submarine geothermal resources
D.L. Williams
1976, Journal of Volcanology and Geothermal Research (1) 85-100
Approximately 20% of the earth's heat loss (or 2 ?? 1012 cal/s) is released through 1% of the earth's surface area and takes the form of hydrothermal discharge from young (Pleistocene or younger) rocks adjacent to active seafloor-spreading centers and submarine volcanic areas. This amount is roughly equivalent to man's...
Late Pleistocene and Holocene depositional trends, processes, and history of Astoria deep-sea fan, Northeast Pacific
H. Nelson
1976, Marine Geology (20) 129-173
The asymmetrical Astoria Fan (110 × 180 km) developed off the Columbia River and Astoria submarine canyon during the Pleistocene. Morphology, stratigraphy, and lithology have been outlined for a Pleistocene turbidite, and a Holocene hemipelagic sedimentary regime to generate geologically significant criteria for comparison with ancient equivalent deposits. Both gray...
Hydrogen and oxygen isotope exchange reactions between clay minerals and water
J. R. O’Neil, Y.K. Kharaka
1976, Geochimica et Cosmochimica Acta (40) 241-246
The extent of hydrogen and oxygen isotope exchange between clay minerals and water has been measured in the temperature range 100–350° for bomb runs of up to almost 2 years. Hydrogen isotope exchange between water and the clays was demonstrable at...
Lithium, nature's lightest metal
Water Resources Division, U.S. Geological Survey
1976, Report
Geologic history of Cape Cod, Massachusetts
Water Resources Division, U.S. Geological Survey
1976, Report
Cape Cod, a sandy peninsula built mostly during the Ice Age, juts into the Atlantic Ocean like a crooked arm. Because of its exposed location, Cape Cod was visited by many early explorers. Although clear-cut evidence is lacking, the Vikings may have sighted this land about 1,000 years ago. It...
Hydrologic data for urban studies in the San Antonio, Texas, metropolitan area, 1974
Victor Gonzalez
1976, Report
No abstract available....
Ground-water discharge from the Edwards and associated limestones, San Antonio area, Texas, 1975
R. A. Rappmund
1976, Edwards Underground Water District Bulletin 35
No abstract available....
Hydrologic data for Cow Bayou, Brazos River Basin, Texas, 1974
J. K. VanZandt
1976, Report
No abstract available....
Annotated bibliography of Texas water resources reports of the Texas Water Development Board and U.S. Geological Survey through August 1974
C. D. Friebele, H. A. Wolff
1976, Texas Water Development Board Report 199
No abstract available....
Hydrologic data for urban studies in the Houston, Texas, metropolitan area, 1974
C.E. Ranzau Jr.
1976, Report
No abstract available....
Hydrologic data for Little Elm Creek, Trinity River Basin, Texas, 1974
R.M. Slade Jr., J.M. Taylor
1976, Report
The U.S. Soil Conservation Service is actively engaged in the implementation of flood- and soil-erosion reducing measures in Texas under the authority of "The Flood Control Act of 1936 and 1944" and "Watershed Protection and Flood Prevention Act" (Public Law 566), as amended. The Soil Conservation Service has found that...
Hydrologic data for urban studies in the Fort Worth, Texas, metropolitan area, 1974
R.M. Slade Jr., J.M. Taylor
1976, Report
No abstract available....
Hydrologic data for Mountain Creek, Trinity River Basin, Texas, 1974
H.D. Buckner
1976, Report
No abstract available....
