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Page 5276, results 131876 - 131900

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Not all publications have extents, not all extents are completely accurate
Preliminary analytical results for a new U.S. Geological Survey Devonian Ohio Shale Standard SDO-1
Joel S. Leventhal, J.G. Crock, W. Mountjoy, J.A. Thomas, V.E. Shale, Paul H. Briggs, J.S. Wahlberg, M.J. Malcolm
1978, Open-File Report 78-447
Using several analytical techniques, results of analysis of U. S. Geological Survey new standard SDO-1 are given for selected elements. The Devonian black shale shows an organic carbon content of approximately 10.3 percent, a sulfur content of approximately 5.6 percent, and a uranium content of approximately 56 ppm. Some elements...
New potassium-argon data on the age of mineralization and metamorphism in the Willow Creek mining district, southern Talkeetna Mountains, Alaska
Miles L. Silberman, Bela Csejtey Jr., James G. Smith, Marvin A. Lanphere, Frederic H. Wilson
1978, Circular 772-B
The now largely abandoned Willow Creek mining district, southern Talkeetna Mountains, Alaska, produced nearly $18,000,000 in gold and minor silver between 1909 and the early 1950's. Mineralized quartz veins, which contain gold and silver along with minor quantities of base metals (in pyrite, galena, chalcopyrite, sphalerite, molybdenite, and arsenopyrite), cut...
Flame and flameless atomic-absorption determination of tellurium in geological materials
T. T. Chao, R. F. Sanzolone, A.E. Hubert
1978, Analytica Chimica Acta (96) 251-257
The sample is digested with a solution of hydrobromic acid and bromine and the excess of bromine is expelled. After dilution of the solution to approximately 3 M in hydrobromic acid, ascorbic acid is added to reduce iron(III) before extraction of tellurium into methyl isobutyl ketone (MIBK). An oxidizing air-acetylene...
K-Ar age of the late Pleistocene eruption of Toba, north Sumatra
D. Ninkovich, N. J. Shackleton, A. A. Abdel-Monem, J. D. Obradovich, G. Izett
1978, Nature (276) 574-577
The late Pleistocene eruption of Toba is the largest magnitude explosive eruption documented from the Quaternary. K-Ar dating of the uppermost unit of the Toba Tuff gives an age of [~amp]sim; 75,000 yr. A chemically and petrographically equivalent ash layer in deep-sea cores helps calibrate the Stage 4-5 boundary of...
Time-dependent friction and the mechanics of stick-slip
James H. Dieterich
1978, Pure and Applied Geophysics PAGEOPH (116) 790-806
Time-dependent increase of static friction is characteristic of rock friction undera variety of experimental circumstances. Data presented here show an analogous velocity-dependent effect. A theor of friction is proposed that establishes a common basis for static and sliding friction. Creep at points of contact causes increases in friction that are...