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184770 results.

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Page 6878, results 171926 - 171950

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Publication Extents

Not all publications have extents, not all extents are completely accurate
The next decade in geochemistry
E. Ingerson
1958, Geochimica et Cosmochimica Acta (14) 185-203
The purpose, associations, functions; and activities of the Geochmical Society are reviewed briefly. Work on the Colorado Plateau uranium deposits is described as an example of what geochemical research, in conjunction with detailed field work, mineralogical studies, and related techniques can contribute to the understanding of a type of deposit....
Isolation and identification of an ester from a crude oil
H.F. Phillips, Irving A. Breger
1958, Geochimica et Cosmochimica Acta (15) 51-56
A dioctylphthalate has been isolated from a crude oil by means of adsorption column chromatography. The ester was identified by means of elemental analysis, refractive index, and its infra-red absorption spectrum. Saponification of the isolate and examination of the resultant alcohol by means of infrared absorption spectra led to the...
Relationship between Secchi disc readings and light penetration in Lake Huron
Alfred M. Beeton
1958, Transactions of the American Fisheries Society (87) 73-79
Fifty-seven paired photometer and Secchi disc measurements made at 18 stations in Saginaw Bay and Lake Huron support the view that a counter-clockwise current usually occurs in the Bay with more transparent Lake Huron water flowing in along the northwest shore and less transparent Bay water flowing out along the...
Biogeochemistry of the rare-earth elements with particular reference to hickory trees
W. O. Robinson, H. Bastron, K. J. Murata
1958, Geochimica et Cosmochimica Acta (14) 55-67
Hickory trees concentrate the rare-earth elements in their leaves to a phenomenal degree and may contain as much as 2300 p.p.m. of total rare earths based on the dry weight of the leaves. The average proportions of the individual elements (atomic percent of the total rare-earth elements) in the leaves...
Some natural variations in the relative abundance of copper isotopes
E. C. Walker, F. Cuttitta, F. E. Senftle
1958, Geochimica et Cosmochimica Acta (15) 183-194
The relative isotopic abundance of copper has been measured in a number of minerals and a few plant materials. Suites of samples from Michigan and the Colorado Plateau have been examined in more detail to determine if local variations due to isotopic exchange or diffusion could be found. The relative...
Determination of the oxidation state of uranium in apatite and phosphorite deposits
R. S. Clarke Jr., Z. S. Altschuler
1958, Geochimica et Cosmochimica Acta (13) 127-142
Geological and mineralogical evidence indicate that the uranium present in apatite may proxy for calcium in the mineral structure as U(IV). An experimental investigation was conducted and chemical evidence was obtained that establishes the presence of U(IV) in apatite.The following analytical procedure was developed for the determination of U(IV). Carbonatefluorapatite...
The water, deuterium, gas and uranium content of tektites
I. Friedman
1958, Geochimica et Cosmochimica Acta (14) 316-324
The water content, deuterium concentration of the water, total gas and uranium contents were determined on tektite samples and other glass samples from Texas, Australia, Philippine Islands, Java, French Indo-China, Czechoslovakia, Libyan Desert, Billiton Island, Thailand, French West Africa, Peru, and New Mexico. The water content ranges from 0.24 per...