xygen isotope, aeromagnetic, and gravity anomalies associated with hydrothermally altered zones in the Yankee Fork mining district, Custer County, Idaho
R.E. Criss, D.E. Champion, D. H. McIntyre
1985, Economic Geology (80) 1277-1296
Epithermal Ag-Au vein and disseminated deposits in the Yankee Fork district are hosted in altered volcanic rocks having low delta 18 O values, low magnetic susceptibilities, low remanent magnetizations, and relatively high densities. These isotopic and physical quantities provide sensitive indices of rock alteration that can be contoured over areas that are...
Evolution and present state of the hydrothermal system in Long Valley caldera
M.L. Sorey
1985, Journal of Geophysical Research Solid Earth (90) 11219-11228
Evidence for previous periods of hydrothermal activity in Long Valley caldera exists in the form of extensive deposits of hydrothermal alteration products at several locations within the caldera and saline deposits in Searles Lake which contain mineral assemblages contributed by hot spring discharge from Long Valley. Hydrothermal activity was more...
Digital image transformation and rectification of spacecraft and radar images
S.S.C. Wu
1985, Photogrammetria (40) 119-134
Digital image transformation and rectification can be described in three categories: (1) digital rectification of spacecraft pictures on workable stereoplotters; (2) digital correction of radar image geometry; and (3) digital reconstruction of shaded relief maps and perspective views including stereograms. Digital rectification can make high-oblique pictures workable on stereoplotters that...
Isotopic studies of the late Archean plutonic rocks of the Wind River Range, Wyoming
J. S. Stuckless, C. E. Hedge, R. G. Worl, K. R. Simmons, Ignatius T. Nkomo, D. B. Wenner
1985, Geological Society of America Bulletin (96) 850-860
Isotopic studies of the Rb-Sr and U-Th-Pb systems in whole-rock samples and the U-Pb systematics for zircons document the existence of two late Arehean intrusive events in the Wind River Range. All of the systems examined indicate an age of ∼2,630 ± 20...
Federal coal resource occurrence and coal development potential maps of the Upper Nutria 7 1/2-minute quadrangle, McKinley County, New Mexico
Berge Exploration Inc.
1985, Open-File Report 80-41
No abstract available....
Ring distributions in alkali- and alkaline-earth aluminosilicate framework glasses- A raman spectroscopic study
S.K. Sharma, J.A. Philpotts, D.W. Matson
1985, Journal of Non-Crystalline Solids (71) 403-410
Raman spectra of crystalline polymorphs of a number of tectosilicate minerals having various sizes of smallest rings of TO4 tetrahedra (T = Si, Al) have been investigated to identify the bands that are sensitive indicators of the smallest rings in the network. The information obtained from the Raman spectra of tectosilicate...
Slumping and shallow faulting related to the presence of salt on the Continental Slope and rise off North Carolina
K. V. Cashman, P. Popenoe
1985, Marine and Petroleum Geology (2) 260-271
Seismic reflection profiles and long- and medium-range sidescan sonar were used to investigate a salt diapir complex and area of slope instability near the base of the Continental Slope off North Carolina. Within the area of investigation three diapirs are bounded on their upslope side by a scarp 60 m...
Petrogenesis of the magmatic complex at Mount Ascutney, Vermont, USA - I. Assimilation of crust by mafic magmas based on Sr and O isotopic and major element relationships
K.A. Foland, C.M.B. Henderson, J. Gleason
1985, Contributions to Mineralogy and Petrology (90) 331-345
The Ascutney Mountain igneous complex in eastern Vermont, USA, is composed of three principal units with compositions ranging from gabbro to granite. Sr and O isotopic and major element relationships for mafic rocks, granites, and nearby gneissic and schistose country rock have been investigated in order to describe the petrogenesis...
Low-frequency electrical properties
G.R. Olhoeft
1985, Geophysics (50) 2492-2503
In the interpretation of induced polarization data, it is commonly assumed that metallic mineral polarization dominantly or solely causes the observed response. However, at low frequencies, there is a variety of active chemical processes which involve the movement or transfer of electrical charge. Measurements of electrical properties at low frequencies...
USGS Telecommunications Responding to Change
James L. Hott
1985, Journal of Surveying Engineering (111) 14-22
The telecommunications industry is undergoing tremendous change due to the court ordered breakup of the monopoly once enjoyed by American Telephone & Telegraph (AT&T). This action has resulted in a plethora of new services and products in all of the communications fields, including traditional voice and data. The new products...
Errors and parameter estimation in precipitation-runoff modeling: 1. Theory
Brent M. Troutman
1985, Water Resources Research (21) 1195-1213
Errors in complex conceptual precipitation-runoff models may be analyzed by placing them into a statistical framework. This amounts to treating the errors as random variables and defining the probabilistic structure of the errors. By using such a framework, a large array of techniques, many of which have been presented in...
The plumbotectonics of the West Shasta mining district, eastern Klamath Mountains, California
B. R. Doe, M.H. Delevaux, J. P. Albers
1985, Economic Geology (80) 2136-2148
The tectonic setting comprising the West Shasta mining district has often been compared with that of primitive island arcs. Concentrations of uranium, thorium, and lead and lead isotope compositions were determined for Devonian ores and rocks of the West Shasta district, eastern Klamath Mountains, California, to help evaluate the tectonic...
Paraheritschioides, a new rugose coral genus from the Upper Pennsylvanian of Idaho
W.J. Sando
1985, Journal of Paleontology (59) 979-985
Colonial rugose corals are rare and generally poorly diversified in the Upper Pennsylvanian of the western interior region, conterminous USA. Paraheritschioides n.gen., which includes P. grandis n.sp., and P. complexa n.sp. from the Oquirrh Formation in Idaho, provides a new tool for distinguishing Upper Pennsylvanian rocks in the western interior....
A policy evaluation tool: Management of a multiaquifer system using controlled stream recharge
Wesley R. Danskin, Steven M. Gorelick
1985, Water Resources Research (21) 1731-1747
A model for the optimal allocation of water resources was developed for a multiaquifer groundwater and surface water system near Livermore, California. The complex groundwater system was analyzed using a transient, quasi-three-dimensional model that considers the nonlinear behavior of the unconfined aquifer. The surface water system consists of a reservoir...
Middle Proterozoic uplift events in the Dunbar dome of northeastern Wisconsin, USA
Z. E. Peterman, P.K. Sims, R. E. Zartman, K. J. Schulz
1985, Contributions to Mineralogy and Petrology (91) 138-150
Isotopic ages of granitic and metamorphic rocks exposed in the Dunbar structural dome of northeastern Wisconsin identify a protracted series of tectonic and "hydrothermal" events that culminated in major regional uplift during Middle Proterozoic (Keweenawan; ca 1,100 Ma) continental rifting and volcanism. The major rock-forming events and the structural development...
General P, type-I S, and type-II S waves in anelastic solids; inhomogeneous wave fields in low-loss solids
Roger D. Borcherdt, Leif Wennerberg
1985, Bulletin of the Seismological Society of America (75) 1729-1763
The physical characteristics for general plane-wave radiation fields in an arbitrary linear viscoelastic solid are derived. Expressions for the characteristics of inhomogeneous wave fields, derived in terms of those for homogeneous fields, are utilized to specify the characteristics and a set of reference curves for general P and S wave fields in arbitrary viscoelastic...
Tolerance of West Indian manatees to capture and handling
T. J. O'Shea, G. B. Rathbun, E.D. Asper, S.W. Searles
1985, Biological Conservation (33) 335-349
Ninety-two West Indian manatees (Trichechus manatus) have been captured in the southeastern United States from October 1975 through November 1983 with no evidence of an unusual susceptibility to capture myopathy. Of these, 53 were radio-tracked or observed in the field following capture with no evidence of delayed capture stress. Blood samples obtained...
Salmonid whirling disease: serological cross-reactivity confirms myxosporidian-actinosporean unity
M.E. Markiw
1985, Research Information Bulletin 85-74
No abstract available at this time...
A population survey of the Tin Mountain bighorn population
W.C. Dunn, C. L. Douglas
1985, Technical Report CPSU/UNLV 006/36
No abstract available at this time...
Maneuverability of the Humboldt penguin (Spheniscus humboldti) during swimming
Clifford A. Hui
1985, Canadian Journal of Zoology (63) 2165-2167
Analyses of high-speed film of captive Humboldt penguins (Spheniscus humboldti) show that there is no correlation between the radii of submerged turns and swimming speed. The sharpest turns had a mean turn radius (n = 5) of 0.14 m (0.24 body lengths), were powered by beating wings, and used multiple steering structures (beak,...
A model of climatic variables affecting bighorn lamb survival in Canyonlands National Park, Utah
C. L. Douglas, C. Annable
1985, Technical Report CPSU/UNLV 031/02
No abstract available at this time...
Altered energy metabolism in an irradiated population of lizards at the Nevada Test Site
K.A. Nagy, P.A. Medica
1985, Radiation Research (103) 98-104
Field metabolic rates (via doubly labeled water), body compartmentalization of energy stores, and energy assimilation efficiencies were measured to assess all avenues of energy utilization in Uta stansburiana living in a low-level γ-irradiated plot in Rock Valley, Nevada. Comparison of energy budgets for radiation-sterilized females with those of nonirradiated control...
Active tectonic and magmatic processes beneath Long Valley Caldera, eastern California: An overview
D.P. Hill, R. A. Bailey, A.S. Ryall
1985, Journal of Geophysical Research Solid Earth (90) 11111-11120
Geological, chronological, and structural studies of the Long Valley-Mono/Inyo Craters area document a long history of related volcanic eruptions and earthquakes controlled by regional extensional tectonics of the Basin and Range province. This activity has persisted for hundreds of thousands of years and is likely to continue. The Long Valley...
Preliminary evaluation of the landsat-4 thematic mapper data for mineral exploration
M. H. Podwysocki, M.S. Power, O. D. Jones
1985, Advances in Space Research (5) 13-20
Landsat-4 Thematic Mapper (TM) data recorded over an arid terrain were analyzed to determine the applicability of using of TM data for identifying and mapping hydrothermally altered, potentially mineralized rocks. Clays, micas, and other minerals bearing the OH anion in specific crystal lattice positions have absorption bands in the 2.2-??m...
SCHLUMBERGER SOUNDING RESULTS OVER THE NEWBERRY VOLCANO AREA, OREGON.
Robert J. Bisdorf
1985, Conference Paper, Transactions - Geothermal Resources Council
Schlumberger soundings were made in the Newberry volcano area of Oregon to categorize the electrical properties of possible Cascade geothermal systems. An east-west geoelectric cross section constructed from the interpreted soundings shows a low-resistivity zone in the caldera, that corresponds to the increase in thermal gradient observed in a U....
