In situ capture gamma-ray analysis of coal in an oversize borehole
J.L. Mikesell, D.W. Dotson, F. E. Senftle, R.S. Zych, J. Koger, L. Goldman
1983, Nuclear Instruments and Methods In Physics Research (215) 561-566
In situ capture gamma-ray analysis in a coal seam using a high resolution gamma-ray spectrometer in a close-fitting borehole has been reported previously. In order to check the accuracy of the method under adverse conditions, similar measurements were made by means of a small-diameter sonde in an oversize borehole in...
Palaeomagnetism of lower cretaceous tuffs from Yukon-Kuskokwim delta region, western Alaska
B.R. Globerman, R. S. Coe, J. M. Hoare, J. Decker
1983, Nature (305) 516-520
During the past decade, the prescient arguments1-3 for the allochthoneity of large portions of southern Alaska have been corroborated by detailed geological and palaeomagnetic studies in south-central Alaska 4-9 the Alaska Peninsula10, Kodiak Island11,12 and the Prince William Sound area13 (Fig. 1). These investigations have demonstrated sizeable northward displacements for...
Evidence for dyke intrusion earthquake mechanisms near long valley caldera, California
B.R. Julian
1983, Nature (303) 323-325
A re-analysis of the magnitude 6 earthquakes that occurred near Long Valley caldera in eastern California on 25 and 27 May 1980, suggests that at least two of them, including the largest, were probably caused by fluid injection along nearly vertical surfaces and not by slip on faults. Several investigators...
The nature of carbon dioxide waters in Snaefellsnes, western Iceland
S. Arnorsson, I. Barnes
1983, Geothermics (12) 171-176
Over 20 occurrences of thermal and non-thermal waters rich in carbon dioxide are known in the Snaefellsnes Peninsula of western Iceland. On the basis of the thermal, chemical and isotopic characteristics of these waters, and hydrological considerations, it is concluded that they represent meteoric waters which have seeped to variable...
Estimation of groundwater recharge parameters by time series analysis
Richard L. Naff, Allan L. Gutjahr
1983, Water Resources Research (19) 1531-1546
A model is proposed that relates water level fluctuations in a Dupuit aquifer to effective precipitaton at the top of the unsaturated zone. Effective precipitation, defined herein as that portion of precipitation which becomes recharge, is related to precipitation measured in a nearby gage by a two-parameter function. A second-order...
The Chilean nitrate deposits.
G. E. Ericksen
1983, American Scientist (71) 366-374
The nitrate deposits in the arid Atacama desert of northern Chile consist of saline-cemented surficial material, apparently formed in and near a playa lake that formerly covered the area. Many features of their distribution and chemical composition are unique. The author believes the principal sources of the saline constituents were...
CHEMICAL STRUCTURES IN COAL: GEOCHEMICAL EVIDENCE FOR THE PRESENCE OF MIXED STRUCTURAL COMPONENTS.
Patrick G. Hatcher, Irving A. Breger, G.E. Maciel, N.M. Szeverenyi
1983, Conference Paper
The purpose of this paper is to summarize work on the chemical structural components of coal, comparing them with their possible plant precursors in modern peat. Solid-state **1**3C nuclear magnetic resonance (NMR), infrared spectroscopy (IR), elemental analysis and, in some cases, individual compound analyses formed the bases for these comparisons....
Tin granites of Seward Peninsula, Alaska
T. Hudson, Joseph G. Arth
1983, Geological Society of America Bulletin (94) 768-790
Seven granite plutons, spatially and genetically related to tin metalization, are exposed in a 170-km-long belt across northwestern Seward Peninsula, Alaska. These plutons are cupolas and epizonal composite stocks that consist of several textural varieties of biotite granite, including medium- to coarse-grained seriate...
Mineral discrimination using a portable ratio-determining radiometer
G. Whitney, M. J. Abrams, Alexander F.H. Goetz
1983, Economic Geology (78) 688-698
The instrument has ten bands in the visible and near-infrared portion of the spectrum (0.5-2.4 mu m). Measurements and statistical analyses were performed on 66 samples, which were characterized by microscopic and X-ray diffraction analyses. On the ability to discriminate between 16 mineralogical groups, 91 percent classification accuracy was achieved....
Seismological programs in Costa Rica
W. Montero
Henry Spall, editor(s)
1983, Earthquake Information Bulletin (USGS) (15) 11-15
At the beginning of the 1970's, a series of programs in seismology were initiated by different Costa Rican institutions, and some of these programs are still in the process of development. The institutions are Insituto Costaricense de Electricidad (ICE)- The Costa Rica Institute of Electricity La Universidad Nacional Autonoma (UNA)- The National...
A method for estimating ground-water return flow to the lower Colorado River in the Yuma area, Arizona and California
Omar J. Loeltz, S. A. Leake
1983, Water-Resources Investigations Report 83-4220
No abstract available....
Hydrology of the Ferron Sandstone aquifer and effects of proposed surface-coal mining in Castle Valley, Utah, with a section on stratigraphy and a section on leaching of overburden
Gregory C. Lines, Daniel J. Morrissey, Thomas A. Ryer, Richard H. Fuller
1983, Water Supply Paper 2195
Coal in the Ferron Sandstone Member of the Mancos Shale of Cretaceous age has traditionally been mined by underground techniques in the Emery Coal Field in the southern end of Castle Valley in east-central Utah. However, approximately 99 million tons are recoverable by surface mining. Ground water in the Ferron...
Impact of changes in land use on the ground-water system in the Sequim-Dungeness Peninsula, Clallam County, Washington
B. W. Drost
1983, Water-Resources Investigations Report 83-4094
A digital-computer model was developed to simulate three-dimensional ground-water flow in aquifers underlying the Sequim-Dungeness peninsula, Clallam County, Washington. Analysis using the model shows that leakage from irrigation ditches is the area 's most important source of ground-water recharge. Termination of the irrigation system would lead to lower heads throughout...
Measurement of the reaeration coefficients of the North Fork Licking River at Utica, Ohio by radioactive tracers
Janet Hren
1983, Water-Resources Investigations Report 83-4192
Reaeration coefficients of the North Fork Licking River at Utica, Ohio were measured by the radioactive-tracer method. The tests were conducted on a 2.1-mile reach on September 23 and October 7, 1981, during low-flow conditions. Krypton-85 gas and tritium were the radioopactive tracers, which were used in conjunction with rhodamine-WT...
Detection of infectious hematopoietic necrosis virus in river water and demonstration of waterborne transmission
Daniel M. Mulcahy, Ronald J. Pascho, C.K. Jenes
1983, Journal of Fish Diseases (6) 321-330
In a study of the possible role of waterborne infectious haematopoietic necrosis virus in transmission of the disease among spawning sockeye salmon, Oncorhynchus nerka (Walbaum), both infection rates and virus titres were higher in fish held at high density in a side channel than in fish in the adjacent river....
A natural earthquake laboratory in Arkansas
A. C. Johnston
1983, Earthquake Information Bulletin (USGS) (15) 210-215
Preparing a Detailed Landslide-Inventory Map for Hazard Evaluation and Reduction
Gerald F. Wieczorek
1983, Bulletin of the Association of Engineering Geologists (21) 337-342
A method of preparing a detailed landslide-inventory map has been developed which provides the engineering geologist with the basic information for evaluating and reducing landslide hazards or risk on a regional or community level. For each landslide, the map depicts state of activity, certainty of identification, dominant type of slope...
Observations of emperor geese feeding at Nelson Lagoon, Alaska
Margaret R. Petersen
1983, The Condor (85) 367-368
Estuaries along the north side of the Alaska Peninsula provide essential habitat for most of the American population of Emperor Goose (Chen canagica) during migration (Petersen and Gill 1982). Most of the population passes through Nelson Lagoon in spring and fall, with over 40,000 birds recorded there (Gill et al...
Retention of infectious haematopoietic necrosis virus infectivity in fish tissue homogenates and fluids stored at three temperatures
J. Burke, D. Mulcahy
1983, Journal of Fish Diseases (6) 543-547
Pools of brain, kidney, spleen, liver and gut tissues from several rainbow trout, Salmo gairdneri Richardson, and whole sockeye salmon, Oncorhynchus nerka (Walbaum), fry were homogenized with a known amount of infectious haematopoietic necrosis virus (IHNV). Virus was also added to ovarian fluids and sera pooled from several rainbow trout....
Earthquakes in the Orozco transform zone: seismicity, source mechanisms, and tectonics
Anne M. Trehu, Sean C. Solomon
1983, Journal of Geophysical Research B: Solid Earth (88) 8203-8225
As part of the Rivera Ocean Seismic Experiment, a network of ocean bottom seismometers and hydrophones was deployed in order to determine the seismic characteristics of the Orozco transform fault in the central eastern Pacific. We present hypocentral locations and source mechanisms for 70 earthquakes recorded by this network. All...
Distribution of oceanic and continental leads in the Arabian-Nubian Shield
J. S. Stacey, D. B. Stoeser
1983, Contributions to Mineralogy and Petrology (84) 91-105
New common lead data for feldspar, whole-rock, and galena samples from the Arabian-Nubian Shield, together with data from previous work, can be divided into two main groups. Group I leads have oceanic (mantle) characteristics, whereas group II leads have incorporated a continental-crustal component of at least early Proterozoic age. The...
Speculation on martian north polar wind circulation and the resultant orientations of polar sand dunes
A. W. Ward, K.B. Doyle
1983, Icarus (55) 420-431
Dunes in the Martian north polar erg show two dominant orientations. When seen at frost cap minimum, dunes north of 80°N record east winds, dunes south of 80°N record west winds. Many of the transverse dunes are considered to be reversing...
Explosive activity associated with the growth of volcanic domes
C. G. Newhall, W.G. Melson
1983, Journal of Volcanology and Geothermal Research (17) 111-131
Domes offer unique opportunities to measure or infer the characteristics of magmas that, at domes and elsewhere, control explosive activity. A review of explosive activity associated with historical dome growth shows that: 1. (1) explosive activity has occurred in close association with nearly all historical dome growth; 2. (2) whole-rock...
Asymptotic distribution of the maximum deficit with correlated, partially regulated outflows
Brent M. Troutman
1983, Water Resources Research (19) 104-108
The asymptotic distribution of the maximum accumulated deficit with partially regulated, Markov-dependent net outflows having a Bernoulli distribution is derived, and the distribution for independent, continuous outflows is presented. It is demonstrated that under partial regulation the maximum deficit behaves as log n, where n is the length of the series; this is...
Hydrothermal alteration of graywacke and basalt by 4 m NaCl
R.J. Rosenbauer, J. L. Bischoff, A. S. Radtke
1983, Economic Geology (78) 1701-1710
Separate experiments at 350 degrees C and 500 bars at a rock/fluid ratio of 1/10. Illite, dolomite, and quartz amounting to 67 percent of the original graywacke, were converted to albite and smectite. The rock gained Na and released Ca, K, heavy metals, and CO 2 to solution. In sharp contrast, the...
