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Page 378, results 9426 - 9450

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Not all publications have extents, not all extents are completely accurate
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...
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...
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...
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...
Soda Creek springs - metamorphic waters in the eastern Alaska Range
D.H. Richter, D.E. Donaldson, R.A. Lamarre
1973, Journal of Research of the U.S. Geological Survey (1) 523-528
The Soda Creek springs are a group of small, cold mineral springs on the southern flank of the eastern Alaska Range. The spring waters contain anomalous concentrations of carbon dioxide, sodium, chlorine, sulfate, boron, and ammonia and are actively precipitating deposits of calcite and aragonite. Sparingly present in these deposits are mixed-layer illite-montmorillonite clays and...
Antarctic icebergs as a fresh water resource
W.F. Weeks, W. J. Campbell
1973, Polar Record (16) 661-665
In a recent study (Weeks and Campbell, in press), we made a rather complete examination of the idea that icebergs could advantageously be used as a source of fresh water. The origin of the general idea of transporting icebergs is obscure; it may date from the 1850's when ice was...
Two diamictons in a landslide scarp on Admiralty Island, Alaska, and the tectonic insignificance of an intervening peat bed
Robert D. Miller
1973, Journal of Research of the U.S. Geological Survey (1) 309-314
Two till-like diamictons, 700 feet above present sea level on Admiralty Island, Alaska, are separated by peat near the top of a landslide scarp. The lower diamicton is glaciomarine; the upper diamicton is probably a mudflow. The lower diamicton contains the foraminifer Elphidium clavatum Cushman, a species typical of fiords.  Similar diamicton crops out along...
A spectrochemical method for determining the composition of native gold
A.L. Sutton, R.G. Havens, C.L. Sainsbury
1973, Journal of Research of the U.S. Geological Survey (1) 301-307
The spectrochemical method described herein for determining trace, minor, and major element distribution in native gold is applicable over a wide range of particle sizes and over a very large concentration range. The matrices of samples and standards are very closely matched. The method was tested on 100 nuggets from a gold sample collected in...
Late Quaternary sedimentation in the active eastern Aleutian Trench
David J. W. Piper, Roland von Huene, John R. Duncan
1973, Geology (1) 19-22
Sediments originally deposited on the Alaskan Abyssal Plain have been depressed to form the eastern Aleutian Trench. Simultaneously, a wedge of horizontally bedded sediments, about 1 km thick at its axis, has been deposited in the trench. The time-transgressive facies change between this wedge of sediment and the abyssal-plain sediment...
Timing of mesozoic and cenozoic plutonic events in circum-Pacific North America
Marvin A. Lanphere, Bruce L. Reed
1973, GSA Bulletin (84) 3773-3782
Evaluation of isotopic ages of granitic intrusive rocks of large batholiths in circum-Pacific North America indicates that Mesozoic and Cenozoic plutonism was episodic but not periodic. Three intrusive epochs have been defined in the Alaska-Aleutian Range batholith of Alaska on the basis of...
Upper Cretaceous (Maestrichtian) fossils from the Kenai-Chugach Mountains, Kodiak and Shumagin Islands, Southern Alaska
Sandra H. B. Clark, David L. Jones
1973, Journal of Research of the U.S. Geological Survey (1) 125-136
A thick sequence of highly deformed flyschlike metasandstone, slate, and argillite crops out in southern Alaska in the Kenai-Chugach Mountains and on Kodiak and the Shumagin Islands to the southwest. These poorly fossiliferous rocks have long been considered Cretaceous in age because of scattered occurrences of fragmentary shells of Inoceramus. Mainly on the basis of...
Radiochemical monitoring of water after the Cannikin event, Amchitka Island, Alaska, October 1972
L.J. Schroder, Wilbur C. Ballance
1973, Report
The U.S. Geological Survey collected water samples from Arnchitka Island, Alaska, during October 1972. Tritium determinations were made on all samples collected and gross alpha and gross beta/gamma determinations were made on 41 samples. The gross alpha and gross beta determinations when compared with previously determined ranges for fresh waters...
Hydraulic tests in hole UAe-3, Amchitka Island, Alaska
Wilbur C. Ballance
1973, Report
Inflatable straddle packers were used to isolate and test selected intervals in hole UAe-3. Packer seats were poor in the uncased part of the hole because of unstable wall conditions, and leakage around packers occurred during some tests. However, leakage generally was slight, as shown on pressure-gage charts, and had...