Carbonate deposition on tail feathers of ruddy ducks using evaporation ponds
N.H. Euliss Jr., R. L. Jarvis, D.S. Gilmer
1989, Condor (91) 803-806
Substantial carbonate deposits were observed on rectrices of Ruddy Ducks (Oxyura jamaicensis) collected during 1982-1984 on evaporation ponds in the San Joaquin Valley, California. Carbonate deposits were composed of about 75% aragonite and 25% calcite, both polymorphous forms of CaCO3. Significantly more carbonate deposits were observed on Ruddy Ducks as...
Importance of individual species of predators on nesting success of ducks in the Canadian prairie pothole region
Douglas H. Johnson, Alan B. Sargeant, Raymond J. Greenwood
1989, Canadian Journal of Zoology (67) 291-297
We followed 3094 upland nests of several species of ducks. Clutches in most nests were lost to predation. We related daily nest predation rates to indices of activity of eight egg-eating predators, precipitation during the nesting season, and measures of wetland conditions. Activity indices of red fox (Vulpes vulpes), striped...
Undiscovered lode tin resources of the Seward Peninsula, Alaska
B.L. Reed, W. D. Menzie, M. McDermott, D. H. Root, W. Scott, L.J. Drew
1989, Economic Geology (84) 1936-1947
The United States is a net importer of many important minerals, including tin. Consumption of primary tin in the United States is about 36,000 metric tons per year. Identified U.S. tin resources consist of about 40,000 metric tons. Although such figures provide insight about vulnerability to supply disruptions in the...
Comparison of several analytical methods for the determination of tin in geochemical samples as a function of tin speciation
J. S. Kane, J.R. Evans, J.C. Jackson
1989, Chemical Geology (78) 1-14
Accurate and precise determinations of tin in geological materials are needed for fundamental studies of tin geochemistry, and for tin prospecting purposes. Achieving the required accuracy is difficult because of the different matrices in which Sn can occur (i.e. sulfides, silicates and cassiterite), and because of the variability of literature...
Gopherus agassizii: Desert tortoise
Kristen H. Berry
Ian Richard Swingland, Michael W. Klemens, editor(s)
1989, Book chapter, The conservation biology of tortoises
The desert tortoise is one of four allopatric North American tortoises. It occurs in the Mojave and Sonoran deserts of the southwestern United States and Mexico.Auffenberg (1976) divided the genus Gopherus (consisting of four species, G. agassizi, G. berlandieri, G.flavomarginatus, and G. polyphemus) in two osteological groups. Bramble (1982), using...
New fault picture points toward San Francisco Bay area earthquakes
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 116-120
Recent earthquakes and a new way of looking at faults suggest that damaging earthquakes are closing in on the San Francisco area. Earthquakes Awareness Week 1989 in northern California started off with a bang on Monday, 3 April, when a magnitude 4.8 earthquake struck 15 kilometers northeast of San Jose....
Paleomagnetism and tectonic rotation of the lower Miocene Peach Springs Tuff: Colorado Plateau, Arizona, to Barstow, California
Ray E. Wells, John W. Hillhouse
1989, GSA Bulletin (101) 846-863
We have determined remanent magnetization directions of the lower Miocene Peach Springs Tuff at 41 localities in western Arizona and southeastern California. An unusual northeast and shallow magnetization direction confirms the proposed geologic correlation of isolated outcrops of the tuff from the Colorado Plateau to Barstow, California, a distance of...
NEIC; the National Earthquake Information Center
R.P. Masse, R.E. Needham
1989, Earthquakes & Volcanoes (USGS) (21) 4-45
Mexico was hit by one of the most devastating earthquakes in its history on September 19, 1985 at 7:18 a.m. MDT time. this earthquake, which was centered about 380 kilometers west-southwest of Mexico City, had a surface-wave magnitude of 8.1. In less than a minute, seismic waves from this earthquake...
Mechanisms of Cenozoic tectonic rotation, Pacific Northwest Convergent Margin, U.S.A.
Ray E. Wells
1989, Book chapter, Paleomagnetic rotations and continental deformation. NATO ASI Series (C: Mathematical and Physical Sciences)
Large clockwise rotations (15–80°) are characteristic of Cenozoic volcanic and sedimentary rocks along the convergent margin of the northwestern United States. Abundant paleomagnetic data from 62–12 m.y. old rocks in forearc, arc, and backarc regions show that rotation increases with age and with proximity to the coast. Paleomagnetic and structural...
Taking the pulse of the San Andreas Fault
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 112-115
The ninth of January, 1989, was the 32nd anniversary of the great southern California earthquake of 1857. the latest research shows that, on average, at least part of the section of the San Andreas fault that broke then should break again this year. But the same research suggests that the fault's...
Petrology of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon
T. H. Druitt, C. R. Bacon
1989, Contributions to Mineralogy and Petrology (101) 245-259
Evolution of the magma chamber at Mount Mazama involved repeated recharge by two types of andesite (high-Sr and low-Sr), crystal fractionation, crystal accumulation, assimilation, and magma mixing (Bacon and Druitt 1988). This paper addresses the modal compositions, textures, mineral chemistry and magmatic temperatures of (i) products of the 6845±50 BP...
Geomorphology of coastal sand dunes, Baldwin County, Alabama
Bennett L. Bearden, Richard L. Hummell, Robert M. Mink
1989, Conference Paper, Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management
Alabama's coastal eolian deposits are primarily vegetated dunes that are exemplified by sand ridges with flat to undulating upper surfaces and continuous irregular crests. Dune fields occur along Morgan peninsula between the foredune line and Little Lagoon and the Mobile Bay area. These dune fields consist primarily of one or...
The evolution of thermal structure and water chemistry in Lake Nyos
G.W. Kling, M. L. Tuttle, William C. Evans
1989, Journal of Volcanology and Geothermal Research (39) 151-165
We collected a time series of physical and chemical data to gain a better understanding of the dynamics of Lake Nyos. Measurements of water and gas chemistry, and temperature made during January, March, and May 1987 are compared to data taken in September 1986 just after the initial CO2 gas...
Preservation of samples for dissolved mercury
S. N. Hamlin
1989, Water Resources Bulletin (25) 255-262
Water samples for dissolved mercury requires special treatment because of the high chemical mobility and volatility of this element. Widespread use of mercury and its compounds has provided many avenues for contamination of water. Two laboratory tests were done to determine the relative permeabilities of glass and plastic sample bottles...
Chemistry and origin of minor and trace elements in vitrinite concentrates from a rank series from the eastern United States, England, and Australia
P.C. Lyons, C.A. Palmer, N. H. Bostick, J.D. Fletcher, F.T. Dulong, F. W. Brown, Z. A. Brown, M.R. Krasnow, L.A. Romankiw
1989, International Journal of Coal Geology (13) 481-527
A rank series consisting of twelve vitrinite concentrates and companion whole-coal samples from mined coal beds in the eastern United States, England, and Australia were analyzed for C, H, N, O, ash, and 47 trace and minor elements by standard elemental,...
Hydrologic effects of climate change in the Delaware River basin
Gregory J. McCabe, Mark A. Ayers
1989, Water Resources Bulletin (25) 1231-1242
The Thornthwaite water balance and combinations of temperature and precipitation changes representing climate change were used to estimate changes in seasonal soil-moisture and runoff in the Delaware River basin. Winter warming may cause a greater proportion of precipitation in the northern part of the basin to fall as rain, which...
Erosion in the juniata river drainage basin, Pennsylvania
W. D. Sevon
1989, Geomorphology (2) 303-318
Previously calculated erosion rates througouth the Appalachians range from 1.2 to 203 m Myr−1. Calculation of erosion rates has been accomplished by: (1) evaluation of riverine solute and sediment load in either large or small drainage basins; (2) estimation from the volume...
Geochemical variations in a core of hydrogeologic units near Freehold, New Jersey
A. A. Pucci Jr., J. P. Owens
1989, Groundwater (27) 802-812
Solutes were determined for 26 pore-water samples extracted from Tertiary and Cretaceous core material from a 1,320-foot-deep test borehole at Freehold, New Jersey. The cored materials are sediments that form a multilayered aquifer system of seven aquifers and eight confining units in the New Jersey...
Solubility of jarosite solid solutions precipitated from acid mine waters, Iron Mountain, California
Charles N. Alpers, D. Kirk Nordstrom, J.W. Ball
1989, Science Geological Bulletin (42) 281-298
Because of the common occurrence of 15 to 25 mole percent hydronium substitution on the alkali site in jarosites, it is necessary to consider the hydronium content of jarosites in any attempt at rigorous evaluation of jarosite solubility or of the saturation state of natural waters with respect to jarosite....
Geological hazards programs and research in the USA
J.R. Filson
1989, Earthquakes & Volcanoes (USGS) (20) 176-189
Geological hazards have been studied for centuries, but government support of research to lessen their effects is relatively new. This article briefly describes government programs and research underway in the USA that are directed towards reducing losses of life and property from earthquakes, volcanic eruptions and landslides. -from Author...
Late neogene history of the Pacific-Caribbean gateway
G. Keller, C.E. Zenker, S.M. Stone
1989, Journal of South American Earth Sciences (2) 73-108
Planktic foraminiferal provinces of Caribbean DSDP Hole 502A and East Pacific DSDP Hole 503A have been analyzed and compared with benthic and planktic isotope records, carbonate, hiatus events, and sea level changes. Four major events are evident in the closure history of the Pacific-Caribbean gateway, at 6.2, 4.2, 2.4 and...
The nature of the pressure-induced metallization of FeO and its implications to the core-mantle boundary
David M. Sherman
1989, Geophysical Research Letters (16) 515-518
The pressure and temperature-induced metallization of FeO discovered by Knittle et al [1986] is here argued to result from a Mott transition associated with increased Fe(3d)-Fe(3d) orbital overlap at high pressures. The metallic bonding in the Fe(3d) t2g band may account for the 4% volume decrease of...
Distillation irrigation: A low-energy process for coupling water purification and drip irrigation
Jim Constantz
1989, Agricultural Water Management (15) 253-264
A method is proposed for combining solar distillation and drip irrigation to simultaneously desalinize water and apply this water to row crops. In this paper, the basic method is illustrated by a simple device constructed primarily of sheets of plastic, which uses solar energy to distill impaired water and apply...
An attempt to obtain a detailed declination chart from the United States magnetic anomaly map
L.R. Alldredge
1989, Journal of Geomagnetism & Geoelectricity (41) 549-563
Modern declination charts of the United States show almost no details. Greater detail may be of value to surveyors trying to follow old land deed descriptions, or to pilots of small planes or small pleasure boats operating in inland waterways. It would be extremely expensive to make adequate...
The role of catastrophic geomorphic events in central Appalachian landscape evolution
R. B. Jacobson, A.J. Miller, J. A. Smith
1989, Geomorphology (2) 257-284
Catastrophic geomorphic events are taken as those that are large, sudden, and rare on human timescales. In the nonglaciated, low-seismicity central Appalachians, these are dominantly floods and landslides. Evaluation of the role of catastrophic events in landscape evolution includes assessment of...
