Summit Lake landslide and geomorphic history of Summit Lake basin, northwestern Nevada
B. Brandon Curry, W.N. Melhorn
1990, Geomorphology (4) 1-17
The Summit Lake landslide, northwestern Nevada, composed of Early Miocene pyroclastic debris, Ashdown Tuff, and basalt and rhyolite of the Black Rock Range, blocked the upper Soldier Creek-Snow Creek drainage and impounded Summit Lake sometimes prior to 7840 yr B.P. The slide...
Nutrient reserve dynamics of breeding canvasbacks
Jeb A. Barzen, Jerome R. Serie
1990, The Auk (107) 75-85
We compared nutrients in reproductive and nonreproductive tissues of breeding Canvasbacks (Aythya valisineria) to assess the relative importance of endogenous reserves and exogenous foods. Fat reserves of females increased during rapid follicle growth and varied more widely in size during the early phase of this period. Females began laying with...
The relation of catastrophic flooding of Mangala Valles, Mars, to faulting of Memnonia Fossae and Tharsis volcanism
K. L. Tanaka, M. G. Chapman
1990, Journal of Geophysical Research Solid Earth (95) 14315-14323
Detailed stratigraphic relations indicate two coeval periods of catastrophic flooding and Tharsis centered faulting (producing Memnonia Fossae) in the Mangala Valles region of Mars. Major sequences of lava flows of the Tharsis Montes Formation and local, lobate plains flows were erupted during and between these channeling and faulting episodes. First,...
Age and paleoclimatic significance of the Stansbury shoreline of Lake Bonneville, Northeastern Great Basin
Charles G. Oviatt, D.R. Currey, D. M. Miller
1990, Quaternary Research (33) 291-305
The Stansbury shoreline, one of the conspicuous late Pleistocene shorelines of Lake Bonneville, consists of tufa-cemented gravel and barrier beaches within a vertical zone of about 45 m, the lower limit of which is 70 m above the modern average level of Great Salt Lake. Stratigraphic evidence at a number...
Pliocene and Pleistocene alkalic flood basalts on the seafloor north of the Hawaiian islands
D.A. Clague, R. T. Holcomb, J.M. Sinton, R. S. Detrick, M.E. Torresan
1990, Earth and Planetary Science Letters (98) 175-191
The North Arch volcanic field is located north of Oahu on the Hawaiian Arch, a 200-m high flexural arch formed by loading of the Hawaiian Islands. These flood basalt flows cover an area of about 25, 000 km2; the nearly flat-lying...
Application of the DR3M watershed model on a small urban basin
Richard P. Thomas
1990, Water Resources Bulletin (26) 757-766
Data collected at a 79-acre urban watershed in Albuquerque, New Mexico, were used to calibrate and verify the Distributed Routing Rainfall-Runoff Model, a parametric watershed model. Standard errors of estimate for the 38 calibration storms were 33 percent and 38 percent, respectively, for volumes and peaks; and for the 46...
Multidisciplinary hydrologic investigations at Yucca Mountain, Nevada
William W. Dudley Jr.
1990, Conference Paper
Future climatic conditions and tectonic processes have the potential to cause significant changes of the hydrologic system in the southern Great Basin, where a nuclear-waste repository is proposed for construction above the water table at Yucca Mountain, Nevada. Geothermal anomalies in the vicinity of Yucca Mountain probably result from the...
Variations in the styles of erosion along the Florida Escarpment, eastern Gulf of Mexico
D.C. Twichell, L.M. Parson, C. K. Paull
1990, Marine and Petroleum Geology (7) 253-266
GLORIA sidescan sonographs and Seabeam bathymetric data show morphological differences along the Florida Escarpment which reflect that different erosional styles have been active along different parts of this carbonate platform edge. The northern half of the escarpment is cut by numerous small ravines spaced 1-5 km apart. Its southern half...
Initial overview of the San Francisco Bay and Santa Cruz mountains ground motion
A. Gerald Brady
1990, NIST Special Publication 283-288
The strong-motion accelerograms from the Loma Prieta earthquake are analyzed for their long-period content in order to obtain a clearer picture of the long-period wave propogation details. Shear waves having periods in the 3.5 to 4 sec, and 5 to 7 sec ranges travel across four groups of stations with...
Reaction paths and equilibrium end-points in solid-solution aqueous-solution systems
P. D. Glynn, E.J. Reardon, Niel Plummer, E. Busenberg
1990, Geochimica et Cosmochimica Acta (54) 267-282
Equations are presented describing equilibrium in binary solid-solution aqueous-solution (SSAS) systems after a dissolution, precipitation, or recrystallization process, as a function of the composition and relative proportion of the initial phases. Equilibrium phase diagrams incorporating the concept of stoichiometric saturation are used to interpret possible reaction paths and to demonstrate...
Geology and origin of the late Proterozoic Darb Zubaydah ophiolite, Kingdom of Saudi Arabia
J. E. Quick
1990, Geological Society of America Bulletin (102) 1007-1020
The Late Proterozoic (830 ± 20 Ma) Darb Zubaydah ophiolite, north-central Arabian Shield, preserves a largely intact section consisting of ultramafic rocks, gabbro, diabase, granodiorite, and interbedded volcanic and sedimentary rocks. Formation of these rocks within or near an island arc is indicated...
Solid-solution aqueous-solution equilibria: Thermodynamic theory and representation
P. D. Glynn, E.J. Reardon
1990, American Journal of Science (290) 164-201
Thorstenson and Plummer's (1977) "stoichiometric saturation' model is reviewed, and a general relation between stoichiometric saturation Kss constants and excess free energies of mixing is derived for a binary solid-solution B1-xCxA: GE = RT[ln Kss - xln(xKCA) - (l-x)ln((l-x)KBA)]. This equation allows a suitable excess free energy function, such as...
Carbon monoxide detection of chemisorbed oxygen in coal and other carbonaceous materials
C.C. Hinckley, T. Wiltowski, T. Wiltowska, D.W. Ellison, R.H. Shiley, L. Wu
1990, Fuel (69) 103-109
The oxidation of carbon monoxide by mildly oxidized and devolatilized coal samples was studied thermogravimetrically. The oxidation was attributed to oxygen chemisorbed on inorganic components of the coals. The reaction of CO with pyrite producing carbonyl sulphide, OCS, accompanied the oxidation. A mechanism for CO oxidation is proposed in which...
Cooling rate and thermal structure determined from progressive magnetization of the dacite dome at Mount St. Helens, Washington
D. Dzurisin, R.P. Denlinger, J. G. Rosenbaum
1990, Journal of Geophysical Research Solid Earth (95) 2763-2780
Our study of a magnetic anomaly associated with the recently active dacite dome at Mount St. Helens suggests that the dome consists of a hot, nonmagnetized core surrounded by a cool, magnetized carapace and flanking talus. The talus does not contribute to the anomaly because...
Integration of potential-field and digital geologic data for two North American geoscience transects
J. D. Phillips
1990, Journal of Geological Education (38) 330-338
Two North American contributions to the Global Geoscience Transects Program, the Quebec-Maine-Gulf of Maine transect and the Great Lakes portion of the United States-Canadian Border transect, are among the first to produce digital geology in a form that can be combined with gridded gravity and aeromagnetic data. Maps of shaded...
Characterization of transport in an acidic and metal-rich mountain stream based on a lithium tracer injection and simulations of transient storage
Kenneth E. Bencala, Diane M. McKnight, Gary W. Zellweger
1990, Water Resources Research (26) 989-1000
Physical parameters characterizing solute transport in the Snake River (an acidic and metal-rich mountain stream near Montezuma, Colorado) were variable along a 5.2-km study reach. Stream cross-sectional area and volumetric inflow each varied by a factor of 3. Because of transient storage, the residence time of injected tracers in the...
Collection and analysis of colloidal particles transported in the Mississippi River, U.S.A.
T.F. Rees, J. F. Ranville
1990, Journal of Contaminant Hydrology (6) 241-250
Sediment transport has long been recognized as an important mechanism for the transport of contaminants in surface waters. Suspended sediment has traditionally been divided into three size classes: sand-sized (>63 ??m), silt-sized (<63 ??m but settleable) and clay-sized (non-settleable). The first two classes are easily collected and characterized using screens...
Estimating nest success: When Mayfield wins
Douglas H. Johnson, T.L. Shaffer
1990, The Auk (107) 595-600
The Apparent estimator of nest success may be severely biased because unsuccessful nests are less likely to be found than are successful nests. The Mayfield estimator is a preferred alternative. The situation is somewhat different for nests in colonies or on islands because of greater visibility of nests, higher synchrony...
36C1 measurements and the hydrology of an acid injection site
G. Vourvopoulos, J. V. Brahana, E. Nolte, G. Korschinek, A. Priller, B. Dockhorn
1990, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms (52) 451-454
In an area in western Tennessee (United States), an industrial firm is injecting acidic (pH = 0.1) iron chloride into permeable zones of carbonate rocks at depths ranging from 1000 to 2200 m below land surface. Overlying the injection zone at a depth of approximately 500 m below land surface...
Fluorian garnets from the host rocks of the Skaergaard intrusion: implications for metamorphic fluid composition
C. E. Manning, D.K. Bird
1990, American Mineralogist (75) 859-873
Zoned, silica-deficient, calcic garnets containing up to 5 mol% F substitution for O formed during contact metamorphism of basalts by the Skaergaard intrusion in East Greenland. Fluorian calcic garnets occur as a retrograde alteration of prograde wollastonite and clinopyroxene that fills vesicles and vugs in lavas 30-70 m from the...
Relative inactivity during the last 140,000 years of a portion of the La Paz fault, southern Baja California Sur, Mexico
Barney J. Szabo, B.P. Hausback, Joe T. Smith
1990, Environmental Geology and Water Sciences (15) 119-122
Uranium-series dating of corals overlying the undeformed Punta Coyote gravels indicates that the underlying La Paz fault zone has been relatively inactive in this part of the Baja California peninsula during the last 140,000 years, and possibly for a significantly longer period. However, Holocene seismic activities along extensions of the...
Diagenesis associated with subaerial exposure of Miocene strata, southeastern Spain: Implications for sea-level change and preservation of low-temperature fluid inclusions in calcite cement
R.H. Goldstein, E. K. Franseen, M. S. Mills
1990, Geochimica et Cosmochimica Acta (54) 699-704
Many ancient carbonate rocks contain calcite cements that precipitated from shallow, fresh groundwater that entered strata during events of subaerial exposure. Such low-temperature cementation may be difficult to interpret from fluid inclusion studies because some of the inclusions may reequilibrate during later thermal events. Miocene rocks of southeast Spain provide...
Seismic site effects and the spatial interpolation of earthquake seismograms: Results using aftershocks of the 1986 North Palm Springs, California, earthquake
P. Spudich, D.P. Miller
1990, Bulletin of the Seismological Society of America (80) 1504-1532
We address the following two questions. Can a microearthquake's ground motions be modeled by incident P and S waves that excite a site transfer-function that is a smooth function of incidence angle? Given recorded ground motions from a set of earthquakes having known locations and mechanisms, can we derive such...
Late Cretaceous age of fractures in the Sierra Nevada batholith, California
P. Segall, E.H. McKee, S.J. Martel, B. D. Turrin
1990, Geology (18) 1248-1257
Regional sets of steeply dipping joints and faults are common throughout the Sierra Nevada batholith, yet relatively little is known about how or when they formed. Within some east-northeast-striking, left-lateral fault zones in the Mount Abbot quadrangle of the central Sierra Nevada, the...
National contaminant biomonitoring program: concentrations of arsenic, cadmium, copper, lead, mercury, selenium, and zinc in U.S. Freshwater Fish, 1976–1984
Christopher J. Schmitt, William G. Brumbaugh
1990, Archives of Environmental Contamination and Toxicology (19) 731-747
From late 1984 to early 1985, the U.S. Fish and Wildlife Service collected a total of 315 composite samples of whole fish from 109 stations nationwide, which were analyzed for arsenic, cadmium, copper, lead, mercury, selenium, and zinc. Geometric mean, maximum, and 85th percentile concentrations (μg/g wet weight) for 1984...
