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Page 5922, results 148026 - 148050

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Not all publications have extents, not all extents are completely accurate
Volcanic rocks and processes of the Mid-Atlantic Ridge rift valley near 36 ° 49′ N
R. Hekinian, J.G. Moore, W.B. Bryan
1976, Contributions to Mineralogy and Petrology (58) 83-110
Eighty samples of submarine basaltic lava were sampled from an 8 km segment of the floor and walls of the inner rift valley of the Mid-Atlantic Ridge during the French American Mid-Ocean Undersea Study (project Famous). The samples were collected from outcrops and talus slopes by the three submersibles:...
Antiquity of man in America indicated by radiometric dates on the Yuha burial site
J. L. Bischoff, R. Merriam, W.M. Childers, R. Protsch
1976, Nature (261) 128-129
MUCH evidence suggests that man was present in the Western Hemisphere before 12,000 yr ago, but the case has remained less than conclusive1. In some situations, the geological age of the site is reasonably well established but the association or nature of the artefacts is questionable2,3....
On the origin of the livingstonite deposits at Huitzuco, Guerrero, Mexico
G. Tunell, R. E. Learned, E.F. Lawrence
1976, Mineralium Deposita (11) 71-82
Livingstonite is the principal ore mineral in the deposits of the Huitzuco District in the State of Guerrero, Mexico. The ore is found in the lower part of the Morelos Formation, which consists of a thick bed of sedimentary anhydrite containing lenses of dolomite and dolomite breccia. In the unweathered...
Equilibrium-disequilibrium relations in the Monte Rosa Granite, Western Alps: Petrological, Rb-Sr and stable isotope data
M. Frey, J.C. Hunziker, J. R. O’Neil, H.W. Schwander
1976, Contributions to Mineralogy and Petrology (55) 147-179
Nine samples from the Monte Rosa Granite have been investigated by microscopic, X-ray, wet chemical, electron microprobe, stable isotope and Rb-Sr and K-Ar methods. Two mineral assemblages have been distinguished by optical methods and dated as Permian and mid-Tertiary by means of Rb-Sr age determinations. The Permian assemblage comprises quartz,...
Strontium isotopic geochemistry of the volcanic rocks and associated megacrysts and inclusions from Ross Island and vicinity, Antarctica
J. S. Stuckless, R.L. Ericksen
1976, Contributions to Mineralogy and Petrology (58) 111-126
Twelve whole-rock samples of volcanic rocks and a composite of 11 basanitoid samples from Ross Island and vicinity, Antarctica show a narrow range of 87Sr/86Sr ratios from 0.70305 to 0.70339. This range is consistent with a model of differentiation from a single parent magma, but the data allow a 30% variation in...
Plankton secondary productivity and biomass: Their relation to lake trophic state
G.L. Pederson, E.B. Welch, A.H. Litt
1976, Hydrobiologia (50) 129-144
The biomass and production of the most important zooplankton species were followed for two years in three lakes of varying trophic status in the Lake Washington watershed. Cladocerans and copepods were of equal importance in the biomass of lakes Findley and Chester Morse (both oligotrophic), whereas, copepods were the main...
Leasing policies for the extractive resources
E. D. Attanasi, S.R. Johnson
1976, The Annals of Regional Science (10) 36-49
Much of the available analysis of policies for the disposal of publicly held resources is based on comparatively straightforward extensions of the neoclassical pricing and allocation theory. As such, these analyses have to a large extent not fully incorporated the fact that firms normally acquire rights...
Relative influence upon microwave emissivity of fine-scale stratigraphy, internal scattering, and dielectric properties
A. W. England
1976, Pure and Applied Geophysics PAGEOPH (114) 287-299
The microwave emissivity of relatively low-loss media such as snow, ice, frozen ground, and lunar soil is strongly influenced by fine-scale layering and by internal scattering. Radiometric data, however, are commonly interpreted using a model of emission from a homogeneous, dielectric halfspace whose emissivity derives exclusively...
Crater dimensions from apollo data and supplemental sources
R.J. Pike
1976, The Moon (15) 463-477
A catalog of crater dimensions that were compiled mostly from the new Apollo-based Lunar Topographic Orthophotomaps is presented in its entirety. Values of crater diameter, depth, rim height, flank width, circularity, and floor diameter (where applicable) are tabulated for a sample of 484 craters on the...
On simultaneous tilt and creep observations on the San Andreas Fault
M.J.S. Johnston, S. McHugh, S. Burford
1976, Nature (260) 691-693
THE installation of an array of tiltmeters along the San Andreas Fault1 has provided an excellent opportunity to study the amplitude and spatial scale of the tilt fields associated with fault creep. We report here preliminary results from, and some implications of, a search for interrelated surface...
Serpentinization and alteration in an olivine cumulate from the Stillwater Complex, Southwestern Montana
N.J. Page
1976, Contributions to Mineralogy and Petrology (54) 127-137
Some of the olivine cumulates of the Ultramafic zone of the Stillwater Complex, Montana, are progressively altered to serpentine minerals and thompsonite. Lizardite and chrysotile developed in the cumulus olivine and postcumulus pyroxenes; thompsonite developed in postcumulus plagioclase. The detailed mineralogy, petrology, and chemistry indicate that...
Problems in shallow land disposal of solid low-level radioactive waste in the united states
P. R. Stevens, G.D. DeBuchananne
1976, Bulletin of the International Association of Engineering Geology (13) 161-171
Disposal of solid low-level wastes containing radionuclides by burial in shallow trenches was initiated during World War II at several sites as a method of protecting personnel from radiation and isolating the radionuclides from the hydrosphere and biosphere. Today, there are 11 principal shallow-land burial sites in the United States...
Gravitational spreading of steep-sided ridges ("sackung") in western United States
D. H. Radbruch-Hall, D. J. Varnes, W. Z. Savage
1976, Bulletin of the International Association of Engineering Geology (13) 23-35
Large-scale gravitational spreading and movement along fractures of steep-sided ridges in the mountainous areas of the western United States are characterized by linear fissures, trenches, and uphill-facing scarps on tops and sides of ridges. Spreading appears to take place by movement along disconnected planes and/or by...
Landslides - Cause and effect
D. H. Radbruch-Hall, D. J. Varnes
1976, Bulletin of the International Association of Engineering Geology (13) 205-216
Landslides can cause seismic disturbances; landslides can also result from seismic disturbances, and earthquake-induced slides have caused loss of life in many countries. Slides can cause disastrous flooding, particularly when landslide dams across streams are breached, and flooding may trigger slides. Slope movement in general is a major process of...
Fission-track dating of pumice from the KBS Tuff, East Rudolf, Kenya
A.J. Hurford, A.J.W. Gleadow, C. W. Naeser
1976, Nature (263) 738-740
Fission-track dating of zircon separated from two pumice samples from the KBS Tuff in the Koobi Fora Formation, in Area 131, East Rudolf, Kenya, gives an age of 2.44±0.08 Myr for the eruption of the pumice. This result is compatible with the previously published K–Ar and 40Ar/39Ar...
An investigation of the critical liquid-vapor properties of dilute KCl solutions
R.W. Potter II, R.S. Babcock, G.K. Czamanske
1976, Journal of Solution Chemistry (5) 223-230
The three parameters that define the critical point, temperature, pressure, and volume have been experimentally determined by means of filling studies in a platinum-lined system for five KCl solutions ranging from 0.006 to 0.568m. The platinum-lined vessels were used to overcome the problems with corrosion experienced...