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Page 378, results 9426 - 9450

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Index of metallic mineral deposits of Alaska compiled from reports in open files of the U.S. Geological Survey and U.S. Bureau of Mines through 1972
Edward H. Cobb
1973, Open-File Report 73-47
This index supplements a similar index of published reports (Cobb, 1973) currently being processed for formal publication. Inasmuch as many open-file reports are preliminary and eventually superseded by final published reports, it is inappropriate to include references to open-file reports in a permanent index. As most preliminary reports are of...
Fractionation and characterization of natural organic matter from certain rivers and soils by free-flow electrophoresis
J.A. Leenheer, Ronald L. Malcolm
1973, Water Supply Paper 1817-E
Soluble river organic matter and soil fulvic acids from a variety of environments were compared by examining the free-flow electrophoretic fractionation curves of organic carbon, color, and polysaccharides. Significant amounts of virtually colorless organic material were found in both the soil and the river preparations. Polysaccharides comprised 20-75 percent of...
Probable rift origin of the Canada basin, Arctic Ocean
Irvin L. Tailleur
1973, Open-File Report 73-274
Formation of the Canada basin by post-Triassic rifting seems the most workable and logical hypothesis with information available. Speculated counterclockwise rotation of the Alaska-Chukchi continental edge best rationalizes the complex geology of northern Alaska, whereas a single continental block before the Jurassic makes the best palinspastic fit for Arctic America....
Measurement of lateral erosion at proposed river crossing sites of the Alaskan pipeline
James Brice
1973, Open-File Report 73-31
This study of lateral erosion rates by comparison of aerial photographs was undertaken at the request of D. M. Culbertson, hydraulic engineer, U.S. Geological Survey, Menlo Park, Calif., and preparatory work in Alaska (during June 1-18, 1971) was done with the cooperation of Harry Hulsing, district chief, Alaska District. Examination...
Radiometric ages of Kodiak Seamount and Giacomini Guyot, Gulf of Alaska: Implications for Circum-Pacific tectonics
D. L. Turner, R. B. Forbes, Charles W. Naeser
1973, Science (182) 579-581
Kodiak Seamount and Giacomini Guyot have been dated at 22.6 ± 1.1 and 19.9 ± 1.0 [2σ (standard deviation)] × 106 years, respectively. Concordant whole-rock and plagioclase potassium-argon dates and fission-track apatite ages demonstrate that significant quantities of excess radiogenic 40Ar are not present in the dated samples. These...
Radioelement distribution in the basement complex of the Yukon-Tanana upland, Eielson deep test hole, Alaska
C. M. Bunker, C. A. Bush, R. B. Forbes
1973, Journal of Research of the U.S. Geological Survey (1) 659-663
Uranium, thorium, and potassium contents were determined in 94 samples of drill cuttings from a 9,774-foot-deep exploratory hole drilled entirely in crystalline schists of the basement complex of the Yukon-Tanana Upland. The data indicate two distinctively different rock types and reflect differences in the calcite content of the rock. Zones of anomalously high concentrations of...
Alaska-Aleutian range batholith: Geochronology, chemistry, and relation to circum-Pacific plutonism
Bruce L. Reed, Marvin A. Lanphere
1973, GSA Bulletin (84) 2583-2610
Potassium-argon mineral ages and reconnaissance mapping of approximately 65,000 sq km in south-central Alaska indicate that the Mesozoic and Cenozoic plutonic rocks in the region were emplaced during three discrete intrusive epochs. Most of the plutonic rocks are part of the Alaska-Aleutian Range batholith; the remainder appear as outcrops in...
Permian paleogeography of the Arctic
J. Thomas Dutro Jr., R. Birute Saldukas
1973, Journal of Research of the U.S. Geological Survey (1) 501-507
Three large land areas were dominant in the Arctic during the Permian: Fennoscandia, central and southern Siberia (Angara), and Canada. Smaller landmasses were in China, the Seward-Chukotskiy region, northern and eastern Siberia, and near Alaska. Coal deposits and strata bearing land plants covered a large area in central Siberia; saline basins containing red beds formed...
Use of machine-processable field notes in a wilderness mapping project (Granite Fiords area), southeastern Alaska
Henry C. Berg, James G. Smith
1973, Journal of Research of the U.S. Geological Survey (1) 579-585
For reconnaissance geologic mapping and mineral resource evaluation of the Granite Fiords wilderness study area, we developed and used a system of machine-processable field notes. Preprinted field forms standardize notes and serve as checklists that insure collection of all available data. The use of this system cut in half the time required to record data...