Amino acid epimerization implies rapid sedimentation rates in Arctic Ocean cores
H.P. Sejrup, G. H. Miller, J. Brigham-Grette, R. Lovlie, D. Hopkins
1984, Nature (310) 772-775
The palaeooceanography of the Arctic Ocean is less well known than any other ocean basin, due to difficulties in obtaining cores and in providing a secure chronological framework for those cores that have been raised. Most recent investigators have suggested that low sedimentation rates (0.05-0.1 cm kyr-1) have characterized the...
Effect of anisotropy and groundwater system geometry on seepage through lakebeds. 1. Analog and dimensional analysis
H.O. Pfannkuch, T. C. Winter
1984, Journal of Hydrology (75) 213-237
Distribution of seepage through lakebeds is controlled partly by geometric configuration of the lake and of the groundwater system interacting with the lake. To evaluate the effect of these factors, conductive-paper electric-analog models were used to analyze a number of lake and groundwater...
Evolution of the MOSS geographic information system for 32-bit computer systems
R.J. Thompson, Lyndon R. Oleson
1984, Conference Paper
The authors discuss the current status and plans regarding the 32-bit implementation of the Map Overly and Statistical System (MOSS) geographic information system. Increasing interest in this system is promoting significant expansion of its capabilities, but any such enhancements will require careful analysis and planning to ensure that the resulting...
Mineralogy and chemistry of massive sulfide deposits from the Juan de Fuca Ridge
R.A. Koski, D.A. Clague, E. Oudin
1984, Geological Society of America Bulletin (95) 930-945
Six hydrothermal vent sites and associated benthic communities were located in the axial valley of the southern Juan de Fuca Ridge using transponder-navigated bottom photography. The hydrothermal deposits form ledges and shallow mounds within a central zone characterized by a linear bathymetric depression...
DISCRIMINATION OF GRANITOIDS AND MINERALIZED GRANITOIDS IN THE MIDYAN REGION, NORTHWESTERN ARABIAN SHIELD, SAUDI ARABIA, BY LANDSAT MSS DATA-ANALYSIS.
Philip A. Davis, Maurice J. Grolier
1984, Conference Paper
Landsat multispectral scanner (MSS) band and band-ratio databases of two scenes covering the Midyan region of northwestern Saudi Arabia were examined quantitatively and qualitatively to determine which databases best discriminate the geologic units of this semi-arid and arid region. Unsupervised, linear-discriminant cluster-analysis was performed on these two band-ratio combinations and...
Banded iron-formations of late Proterozoic age in the central eastern desert, Egypt: Geology and tectonic setting
P.K. Sims, H. L. James
1984, Economic Geology (79) 1777-1784
In the central Eastern Desert of Egypt, deposits of iron-formation of the Algoma type occur as sharply defined stratigraphic units within layered volcanogenic rocks of late Proterozoic age. The volcanic sequence is characterized by interfingering and repetition of rocks of dominantly andesite-basalt composition and by tectonically juxtaposed ophiolitelike assemblages; it...
Water gun vs air gun: A comparison
D. R. Hutchinson, R. S. Detrick
1984, Marine Geophysical Research (6) 295-310
The water gun is a relatively new marine seismic sound source that produces an acoustic signal by an implosive rather than explosive mechanism. A comparison of the source characteristics of two different-sized water guns with those of conventional air guns shows the the water gun signature is cleaner and much...
Glaciotectonic origin of the Massachusetts coastal end moraines and a fluctuating late Wisconsinan ice margin
R. N. Oldale, C. J. O’Hara
1984, Geological Society of America Bulletin (95) 61-74
Late Wisconsinan end moraines on Cape Cod and islands south and west of Cape Cod are believed to be glaciotectonic features formed by advancing ice fronts. Evidence of a glaciotectonic origin includes the stratified drift composition of the moraines, dislocated preglacial and glaciolacustrine...
Reconnaissance geochemistry of the Mormon Mountains Bureau of Land Management Wilderness Study Area (NV 050-0161), Lincoln County, Nevada
H. N. Barton, G.W. Day
1984, Open-File Report 84-361
No abstract available....
Origins and exploration significance of replacement and vein-type alunite deposits in the Marysvale volcanic field, west central Utah
C. G. Cunningham, R. O. Rye, T. A. Steven, H. H. Mehnert
1984, Economic Geology (79) 50-71
Alunite deposits formed 23 m.y. ago in near-surface, highly oxidizing conditions at the tops of hydrothermal plumes that were spaced at 3- to 4-km intervals around a monzonite stock. The delta 34 S values of 11.5 to 15.4 per mil for replacement alunite along with geologic constraints indicate that sulfate sulfur was...
Streamflow gain-and-loss and suspended-sediment characteristics of the South Platte River and three irrigation canals near Fort Morgan, Colorado
B. C. Ruddy
1984, Water-Resources Investigations Report 84-4220
A 2-year study during 1982-83 was made to document the streamflow gain-and-loss and suspended sediment characteristics of the South Platte River, Fort Morgan Canal, Upper Platte and Beaver Canal, and the Lower Platte and Beaver Canal near Fort Morgan, Colorado, prior to possible construction of the proposed Narrows Reservoir. Six...
Forecasting rates of hydrocarbon discoveries in a changing economic environment
J.H. Schuenemeyer, E. D. Attanasi
1984, Marine and Petroleum Geology (1) 313-318
A method is presented for the estimation of undiscovered oil and gas resources in partially explored areas where economic truncation has caused some discoveries to go unreported; therefore distorting the relationship between the observed discovery size distribution and the parent or ultimate field size distribution. The method is applied to...
Pedimentation versus debris-flow origin of plateau-side desert terraces in southern Utah
V. S. Williams
1984, Journal of Geology (92) 457-468
Plateau-side terraces in arid areas around the world are commonly described as pediment remnants, although, in many cases, they may have been formed by debris-flow deposition. Pediments do exist in the area of the Aquarius and Kaiparowits Plateaus of southern Utah; however, many alluvial terraces that were classified by previous...
The toxicity of chlorine to a common vascular aquatic plant
C.H. Watkins, R.S. Hammerschlag
1984, Water Research (18) 1037-1043
Myriophyllum spicatum was exposed to various chlorine concentrations on a continuous and intermittent basis in 96-h toxicity studies utilizing a proportional diluter. Continuous exposure to chlorine concentrations as low as 0.05 mg l−1 total residual chlorine (TRC) depressed shoot and total plant dry weights approx. 30% relative to controls. Shoot length was...
Submersible pressure outflow cell for measurement of soil water retention and diffusivity from 5 to 95 degrees C
Jim Constantz, W.N. Herkelrath
1984, Soil Science Society of America Journal (48) 7-10
A technique was developed to measure water content in soil as a function of capillary pressure from 5 to 95°C. To overcome problems encountered at high temperature, a modified Tempe pressure cell containing a soil sample is suspended in a constant-temperature water bath. The cell's porous plate is in direct...
The Kingak shale of northern Alaska—regional variations in organic geochemical properties and petroleum source rock quality
Leslie B. Magoon, George E. Claypool
1984, Organic Geochemistry (6) 533-542
The Kingak Shale, a thick widespread rock unit in northern Alaska that ranges in age from Early Jurassic through Early Cretaceous, has adequate to good oil source rock potential. This lenticular-shaped rock unit is as much as 1200 m thick near the Jurassic shelf edge, where its present-day burial depth...
Insights on why graphic correlation (Shaw's method) works
Lucy E. Edwards
1984, Journal of Geology (92) 583-597
In 1964 A. B. Shaw presented a method of correlating fossiliferous sedimentary rocks based on interpretation of graphic plots of first- and last-occurrences of taxa. Because there is no way to determine the true total ranges of fossil taxa, it is instructive to test the accuracy of the method using...
Suppression of bath immunization in rainbow trout by contaminant bath pretreatments
D. P. Anderson, O. W. Dixon, F. W. van Ginkel
M. Kende, J. Gainer, M. Chirigos, editor(s)
1984, Book chapter, Chemical Regulation of Immunity in Veterinary Medicine
No abstract available at this time...
Sulfur and oxygen isotopic systematics of the 1982 eruptions of El Chichón Volcano, Chiapas, Mexico
R. O. Rye, J.F. Luhr, M.D. Wasserman
1984, Journal of Volcanology and Geothermal Research (23) 109-123
Thermometers based on sulfur and oxygen isotopic compositions of anhydrite, pyrrhotite, titanomagnetite, and plagioclase crystals from fresh pumices of the 1982 eruptions of El Chichón Volcano indicate a pre-eruption temperature of 810 ± 40°C, confirming textural evidence that the anhydrite precipitated directly from the melt. The isotopic composition of sulfate...
Jesuits in seismology
D. Linehan
1984, Earthquake Information Bulletin (USGS) (16) 156-165
Jesuits have been involved with scientific endeavors since the 16th century, although their association with seismology is more recent. What impelled Jesuit priests to also become seismologists is am matter of conjecture. Certainly the migration of missionaries to various parts of the world must have resulted in queries to their...
Regional investigations of soil and overburden analysis and plant uptake of metals
L. P. Gough
1984, Minerals and the Environment (6) 105-110
Regional studies on the bioavailability of metals at native and disturbed sites were conducted over the past seven years by the USGS. The work was concentrated in the Fort Union, Powder River, and Green River coal resource regions where measures of extractable metals in soils were found to have limited...
Characterization and geochemistry of Devonian oil shale North Alabama - South Central Tennessee
K.F. Rheams, T.L. Neathery
1984, Conference Paper, Preprints
Based on the physical and chemical data obtained to date, the Devonian oil shale rock of north Alabama and south-central Tennessee appears to offer an attractive potential for future resource development. The shale rock appears to have formed in a restrictive marine environment which provided opportunity for the accumulation of...
Leaching of molybdenum and arsenic from uranium ore and mill tailings
E. R. Landa
1984, Hydrometallurgy (13) 203-211
A sequential, selective extraction procedure was used to assess the effects of sulfuric acid milling on the geochemical associations of molybdenum and arsenic in a uranium ore blend, and the tailings derived therefrom. The milling process removed about 21% of the molybdenum and 53% of the arsenic initially present in...
Statistical summaries of streamflow data in Oregon; Volume 2, western Oregon
John Friday, S. J. Miller
1984, Open-File Report 84-454-A
No abstract available....
Statistical summaries of streamflow data in Oregon; Volume 1, eastern Oregon
John Friday, S. J. Miller
1984, Open-File Report 84-454
Statistical summaries of streamflow data at 335 streamgaging sites are presented in this two volume report to aid in appraising the hydrology of river basins in Oregon. Records for 31 gaging stations were compiled into separate periods owing to changes in regulation during the period of data collection. The periods...
