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Page 6139, results 153451 - 153475

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Lead-alpha age determinations of granitic rocks from Alaska
John J. Matzko, H.W. Jaffe, C. L. Waring
1957, Trace Elements Investigations 618
Lead-alpha activity age determinations were made on zircon from seven granitic rocks of central and southeastern Alaska. The results of the age determinations indicate two periods of igneous intrusion, one about 95 million years ago, during the Cretaceous period, and another about 53 million years ago, during the early part...
Summary of reconnaissance for uranium in Alaska, 1955
John J. Matzko, Val L. Freeman
1957, Trace Elements Investigations 617
Reconnaissance for uranium in Alaska during 1955 included airborne radiometric traverses, examination of radioactivity anomalies found during the airborne traverses, examination of prospector leads, and examination of areas that seems geologically favorable for the occurrence of uranium. The airborne radiometric traverses in central Alaska revealed 33 anomalies considered worth examining....
Reconnaissance for uranium and thorium in Alaska, 1954
John J. Matzko, Robert G. Bates
1957, Trace Elements Investigations 611
During 1954 reconnaissance investigations to locate minable deposits of uranium and thorium in Alaska were unsuccessful. Areas examined, from which prospectors had submitted radioactive samples, include Cap Yakataga, Kodiak Island, and Shirley Lake. Unconcentrated gravels from the beach at Cape Yakataga average about 0.001 percent equivalent uranium. Uranothorianite has been...
Distribution of elements in the Salt Wash member of the Morrison Formation in the Jo Dandy area, Montrose County, Colorado
William L. Newman, Donald P. Elston
1957, Trace Elements Investigations 607
A study of the distribution of elements in the Salt Wash member of the Morrison formation of Jurassic age from samples taken in the Jo Dandy area, Montrose County, Colo., was made to determine average chemical composition of mudstone and sandstone and to determine the magnitude of variations in concentrations...
The Gas Hills uranium district and some probable controls for ore deposition
Howard Davis Zeller
1957, Trace Elements Memorandum 1074
Uranium deposits occur in the upper coarse-grained facies of the Wind River formation of Eocene age in the Gas Hills district of the southern part of the Wind River Basin. Some of the principal deposits lie below the water table in the unoxidized zone and consist of uraninite and coffinite...
Uraniferous coal and carbonaceous shale in northeast Parana, Brazil
Donald D. Haynes, Charles T. Pierson
1957, Trace Elements Memorandum 1097
Uraniferous coal has been found in northeast Parana, Brazil, in the Rio Bonito formation of Pennsylvanian age. In the majority of coal samples taken the uranium oxide content ranges from 0.005 to 0.030 percent, but selected screened samples have contained as much as 0.445 percent uranium oxide. The sampled thickness...
Reconnaissance for radioactive materials in the southern part of Brazil
Charles T. Pierson, Donald D. Haynes, Evaristo Ribeiro Filho
1957, Trace Elements Memorandum 1098
During 1954-1956 a reconnaissance for radioactive minerals was made with carborne, airborne and handborne scintillation equipment in the southern Brazilian states of Rio de Janeiro, Sao Paulo, Parana, Santa Catarina and Rio Grande do Sul. During the traverse covering more than 5,000 kilometers the authors checked the radioactivity of Precambrian...