Possible relationships between trichinellosis and abnormal behavior in bears
David E. Worley, Kenneth R. Greer, Daniel A. Palmisciano
1983, Book chapter, International Conference on Bear Research and Management
Data compiled from parasite studies of grizzly bears (Ursus arctos) and black bears (U. americanus) in the Yellowstone and Glacier National Park populations and surrounding areas of Montana and Wyoming during 1969-79 are reviewed with reference to the possible influence of infection with the muscleworm Trichinella sp. on bear behavior....
Channels and valleys on Mars
Mars Channel Working Group
1983, GSA Bulletin (94) 1035-1054
The discovery of channels, valleys, and related features of aqueous origin on Mars is of profound importance in comparative planetology. Models of the evolution of planetary surfaces and atmospheres must be reconciled with the diversity, abundance, and origins of channels and valleys on Mars. The term “channel” is properly restricted...
Eolian sand bodies of the world
E. D. McKee
1983, Developments in Sedimentology (38) 1-25
This chapter examines the eolian sand bodies of the world. Analyses regarding grain size and sorting distribution at Great Sand Dunes indicate that the higher dunes contain much more fine-grained sand and much less medium-grained sand than do the lower dunes, and, in addition, they are definitely better sorted. Cross-stratification...
A tale of two plutons: petrographic and mineralogic constraints on the petrogenesis of the Red Lake and Eagle Peak plutons, central Sierra Nevada, California
J.H. Noyes, D. R. Wones, F.A. Frey
1983, Journal of Geology (91) 353-379
The two plutons are similar in age (K/Ar, 87-89 m.y.) and range in composition from granodiorite to granite. The Red Lake pluton is equigranular, has a locally greisened marginal zone, and shows only minor mineralogical and chemical zoning, whereas the Eagle Peak pluton is mineralogically, compositionally and texturally zoned, with...
Statistical evaluation of oil and gas prospects in the outer continental shelf of the U.S. Gulf Coast
J.C. Davis, J.W. Harbaugh
1983, Journal of the International Association for Mathematical Geology (15) 217
Areas of the U.S. Gulf Coast, both onshore and offshore, are among the petroliferous regions of the United States. In offshore Louisiana and Texas, most oil and gas is associated with structurally controlled traps on the crest or flanks of domes created by the diapiric movement of salt. These structures...
Thermal decarboxylation of acetic acid: Implications for origin of natural gas
Y.K. Kharaka, W.W. Carothers, R.J. Rosenbauer
1983, Geochimica et Cosmochimica Acta (47) 397-402
Laboratory experiments on the thermal decarboxylation of solutions of acetic acid at 200°C and 300°C were carried out in hydrothermal equipment allowing for on-line sampling of both the gas and liquid phases for chemical and stable-carbon-isotope analyses. The solutions had ambient pH values between 2.5 and 7.1; pH values and...
The granite problem as exposed in the southern Snake Range, Nevada
D. E. Lee, E. H. Christiansen
1983, Contributions to Mineralogy and Petrology (83) 99-116
A geochemically and mineralogically diverse group of granitoids is present within an area of 900 km2 in the southern Snake Range of eastern Nevada. The granitoids exposed range in age from Jurassic through Cretaceous to Oligocene and include two calcic intrusions, two different types of two-mica granites, and aplites. The...
Cenozoic structural history of selected areas in the eastern Great Basin, Nevada-Utah
R. Ernest Anderson
1983, Open-File Report 83-504
The Confusion Range structural trough (CRST) of west-central Utah predates the Oligocene rocks that are exposed along it. The northern part of the axial region of the CRST is complicated by structures that include reverse faults and associated folds, a large-amplitude mushroom fold, and belts of sharply flexed to overturned...
Vapor phase exsolution as a controlling factor in hydrogen isotope variation in granitic rocks: the Notch Peak granitic stock, Utah
P.I. Nabelek, J. R. O’Neil, J. J. Papike
1983, Earth and Planetary Science Letters (66) 137-150
The Notch Peak granitic stock, western Utah, is comprised of three concentric sequentially intruded rock types, from granite at the rim, to quartz monzonite I, to quartz monzonite II at the core. The δ18O values of whole rocks vary about an...
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...
Synthesis of geophysical data with space-acquired imagery: a review
David A. Hastings
1983, Advances in Space Research (3) 157-168
Geophysical data obtained from ground and airborne platforms have been used in the development of regional geologic models for many years. Space-acquired data and imagery have a shorter but similar history of applications. All these data may be synthesized either manually or digitally. Manual synthesis methods consist of overlaying and...
The role of remotely sensed and other special data for predictive modeling: the Umatilla, Oregon example
Thomas R. Loveland, Gary E. Johnson
1983, Photogrammetric Engineering and Remote Sensing (49) 1183-1192
Landsat data and 1:24 000-scale aerial photographs were initially used to map the expansion of irrigation from 1973 to 1979 and to identify crops under irrigation in 1979. The crop data were then used with historical water requirement figures and digital topographic and hydrographic data to estimate water and power...
An updated Bouguer anomaly map of south-central West Africa
David A. Hastings
1983, Geophysics (48) 1120-1128
A new Bouguer gravity anomaly map compiled for western Africa adds data for Ghana, Guinea, and Liberia.The new data add detail to a key part of the Eburnean shield and assist in the development of a model of rifting at the time of the Eburnean orogeny, 2000 million years ago....
Storm-controlled oblique dunes of the Oregon coast
R. E. Hunter, B. M. Richmond, T. R. Alpha
1983, Geological Society of America Bulletin (94) 1450-1465
The large (mean height 25 m, spacing 300 m), relatively straight-crested dunes of the central Oregon coast migrate an average of 3.8 m/yr toward an azimuth of 26°. The dunes are transverse to the strong, south-southwesterly winter storm winds that are responsible for...
Atomic-absorption determination of mercury in geological materials by flame and carbon-rod atomisation after solvent extraction and using co-extracted silver as a matrix modifier
R. F. Sanzolone, T. T. Chao
1983, The Analyst (108) 58-63
Based on modifications and expansion of the original Tindall's solvent extraction flame atomic-absorption procedure, an atomic-absorption spectrophotometric method has been developed for the determination of mercury in geological materials. The sample is digested with nitric and hydrochloric acids in a boiling water-bath. The solution is made ammoniacal and potassium iodide...
Simulation of solute transport in a mountain pool-and-riffle stream: A transient storage model
Kenneth E. Bencala, Roy A. Walters
1983, Water Resources Research (19) 718-724
The physical characteristics of mountain streams differ from the uniform and conceptually well- defined open channels for which the analysis of solute transport has been oriented in the past and is now well understood. These physical conditions significantly influence solute transport behavior, as demonstrated by a transient storage model simulation...
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...
Relationship of two lacustrine ostracode species to solute composition and salinity: Implications for paleohydrochemistry ( Limnocythere sappaensis/staplini)
R. M. Forester
1983, Geology (11) 435-438
Nonmarine ostracode species are indicative of the physical and chemical nature of lacustrine environments. Although salinity has traditionally been regarded as one of the more important parameters that affect the occurrence patterns of lacustrine ostracodes, examination of the solute composition and salinities of...
Geochemistry of diverse basalt types from Loihi Seamount, Hawaii: Petrogenetic implications
F.A. Frey, D.A. Clague
1983, Earth and Planetary Science Letters (66) 337-355
The wide variety of basalt types, tholeiitic to basanite, dredged from Loihi Seamount have minor and trace element abundances that are characteristic of subaerial Hawaiian basalts, thereby confirming that Loihi Seamount is a manifestation of the Hawaiian “hot spot”. Within the Loihi sample suite there are well-defined positive correlations among...
Modeling of self-potential anomalies near vertical dikes
D.V. Fitterman
1983, Geophysics (48) 171-180
The self-potential (SP) Green's function for an outcropping vertical dike is derived from solutions for the dc resistivity problem for the same geometry. The Green's functions are numerically integrated over rectangular source regions on the contacts between the dike and the surrounding material to obtain the SP anomaly. The analysis...
Nd and Sr isotopic studies on cenozoic mafic lavas from West Antarctica: Another source for continental alkali basalts
K. Futa, W.E. Le Masurier
1983, Contributions to Mineralogy and Petrology (83) 38-44
The Nd and Sr isotopic ratios on a suite of continental alkali basalts from Marie Byrd Land, West Antarctica, define a change in the source over the range of K/Ar dates between 1 and 28 m.y. ago. The 87Sr/86Sr isotopic ratios (0.7026 to 0.7031) are unusually low for continental alkali...
Development of reaction models for ground-water systems
Niel Plummer, D.L. Parkhurst, D.C. Thorstenson
1983, Geochimica et Cosmochimica Acta (47) 665-685
Methods are described for developing geochemical reaction models from the observed chemical compositions of ground water along a hydrologic flow path. The roles of thermodynamic speciation programs, mass balance calculations, and reaction-path simulations in developing and testing reaction models are contrasted. Electron transfer is included in the mass balance equations...
Statistical averaging of marine magnetic anomalies and the aging of oceanic crust
R.J. Blakely
1983, Journal of Geophysical Research Solid Earth (88) 2289-2296
Visual comparison of Mesozoic and Cenozoic magnetic anomalies in the North Pacific suggests that older anomalies contain less short-wavelength information than younger anomalies in this area. To test this observation, magnetic profiles from the North Pacific are examined from crust of three ages: 0–2.1, 29.3–33.1, and 64.9–70.3 m.y, B.P. For...
Seasat synthetic aperture radar ( SAR) response to lowland vegetation types in eastern Maryland and Virginia
M. D. Krohn, N.M. Milton, D. B. Segal
1983, Journal of Geophysical Research - Oceans (88) 1937-1952
Examination of SEASAT SAR images of eastern Maryland and Virginia reveals botanical distinctions between vegetated lowland areas and adjacent upland areas. Radar returns from the lowland areas can be either brighter or darker than returns from the upland forests. Scattering models and scatterometer measurements predict an increase of 6 dB...
Liquefaction sites, Imperial Valley, California.
T. L. Youd, M.J. Bennett
1983, Journal of Geotechnical Engineering (109) 440-457
Sands that did and did not liquefy at two sites during the 1979 Imperial Valley, Calif., earthquake (ML = 6.6) are identified and their properties evaluated. SPT tests were used to evaluate liquefaction susceptibility. Loose fine sands in an abandoned channel liquefied and produced sand boils, ground fissures, and a...
