A reinterpretation of the δDH2O of inclusion fluids in contemporaneous quartz and sphalerite, Creede mining district, Colorodo: a generic problem for shallow orebodies?
Nora K. Foley, Philip M. Bethke, Robert O. Rye
1989, Economic Geology (84) 1966-1977
Water extracted from fluid inclusions in quartz from shallow epithermal ore deposits often has a hydrogen isotope composition (δD) different from that of water extracted from inclusions in associated minerals. This difference is usually attributed to the involvement of primary fluids from multiple sources. Isotopic and homogenization and freezing temperature...
Behaviour of abandoned room and pillar mines in Illinois
G.G. Marino, R.A. Bauer
1989, International Journal of Mining and Geological Engineering (7) 271-281
Little comprehensive information has been reported on the behaviour of room-and-pillar mines. The objective of this paper is to present case data on mine failures in the Illinois basin for use in practice. Presented are results of an ongoing study and details on the site characteristics of cases where sags...
On the use of volumetric strain meters to infer additional characteristics of short-period seismic radiation
R. D. Borcherdt, M.J.S. Johnston, G. Glassmoyer
1989, Bulletin of the Seismological Society of America (79) 1006-1023
Volumetric strain meters (Sacks-Evertson design) are installed at 15 sites along the San Andreas fault system, to monitor long-term strain changes for earthquake prediction. Deployment of portable broadband, high-resolution digital recorders (GEOS) at several of the sites extends the detection band for volumetric strain to periods shorter than 5 ×...
Geologic implications of topographic, gravity, and aeromagnetic data in the northern Yukon-Koyukuk province and its borderlands, Alaska
J. W. Cady
1989, Journal of Geophysical Research Solid Earth (94) 15821-15841
The northern Yukon-Koyukuk province is characterized by low elevation and high Bouguer gravity and aeromagnetic anomalies in contrast to the adjacent Brooks Range and Ruby geanticline. Using newly compiled digital topographic, gravity, and aeromagnetic maps, I have divided the province into three geophysical domains. The Koyukuk domain, which is nearly...
Analytical results for ten water-extractable ions from B-horizon soils on St. Thomas and St. Croix, U.S. Virgin Islands and K-Ar ages for seven rocks from St. John and St. Thomas, U.S. Virgin Islands
J. B. McHugh, R. E. Tucker, H. V. Alminas
1989, Open-File Report 89-563
No abstract available....
Rising water levels and the future of southeastern Louisiana swamp forests
W.H. Conner, M. Brody
1989, Estuaries (12) 318-323
An important factor contributing to the deterioration of wetland forests in Louisiana is increasing water levels resulting from eustatic sea-level rise and subsidence. Analyses of long-term water level records from the Barataria and Verret watersheds in southeastern Louisiana indicate an apparent sea level rise of about 1-m per century, mainly...
The nature of the crust in the Yukon-Koyukuk province as inferred from the chemical and isotopic composition of five Late Cretaceous to Early Tertiary volcanic fields in western Alaska
E. Moll-Stalcup, Joseph G. Arth
1989, Journal of Geophysical Research Solid Earth (94) 15989-16020
Late Cretaceous and early Tertiary volcanic and plutonic rocks in western Alaska comprise a vast magmatic province extending from the Alaska Range north to the Arctic Circle, south to Bristol Bay, and west to the Bering Sea Shelf. The chemical and isotopic composition of five of these Late Cretaceous to...
Accretion and canal impacts in a rapidly subsiding wetland II: Feldspar marker horizon technique
Donald R. Cahoon, R.E. Turner
1989, Estuaries (12) 260-268
Recent (6–12 month) marsh sediment accretion and accumulation rates were measured with feldspar marker horizons in the vicinity of natural waterways and man-made canals with spoil banks in the rapidly subsiding environment of coastal Louisiana. Annual accretion rates in aSpartina alterniflora salt marsh in the Mississippi deltaic plain averaged 6 mm...
[Book review] The acid rain controversy, by J. L. Regens and R. W. Rycroft
R.K. Schreiber
1989, Wildlife Review (213) 314-314
Review of: The acid rain controversy, by Regens, J. L., and R. W. Rycroft; 1988; University of Pittsburgh Press, Pittsburgh, Pennsylvania....
The campi flegrei (Italy) geothermal system: A fluid inclusion study of the mofete and San Vito fields
Vivo B. de, H. E. Belkin, M. Barbieri, W. Chelini, P. Lattanzi, A. Lima, L. Tolomeo
1989, Journal of Volcanology and Geothermal Research (36) 303-326
A fluid inclusion study of core from the Mofete 1, Mofete 2, Mofete 5, San Vito 1, and San Vito 3 geothermal wells (Campi Flegrei, Campania, Italy) indicates that the hydrothermal minerals were precipitated from aqueous fluids (??CO2) that were moderately saline (3-4 wt.% NaCl equiv.) to hypersaline (> 26...
Rice available to waterfowl in harvested fields in the Sacramento Valley, California
M. R. Miller, D.E. Sharp, D.S. Gilmer, W.R. Mulvaney
1989, California Fish and Game (75) 113-123
Rice fields in the Sacramento Valley, California were sampled in 1985 and 1986 to determine the weight of rice seed remaining in the fields immediately after harvest and again after the fields were burned. No significant differences were found between years (P>0.05). The pooled mean was 388 kg/ha in harvested...
Nesting biology of pacific loons, Gavia pacifica, on the Yukon-Kuskokwim Delta, Alaska
Margaret R. Petersen
1989, Canadian Field-Naturalist (103) 265-269
The nesting biology of Pacific Loons, Gavia pacifica, was studied from 1973 to 1975 on the Yukon-Kuskokwim Delta, Alaska. Loons maintained territories on ponds throughout the pre-nesting period. Both adults incubated eggs and raised the young. Males incubated more than females during early incubation, and females more than males during...
Extra-pair copulation in the greater white-fronted goose
Craig R. Ely
1989, The Condor (91) 990-991
Controlled experiments and quantitative field studies with both captive and wild waterfowl (Family Anatidae) have demonstrated that extra-pair copulations (EPCs, both forced and unforced) may be a viable alternative reproductive strategy for males (Mineau and Cooke 1979; Burns et al. 1980; Cheng et al. 1982, 1983; Afron 1985; Evarts and...
Generalized procedures for testing hypotheses about survival or recovery rates
John R. Sauer, Byron K. Williams
1989, Journal of Wildlife Management (53) 137-142
Comparisons of survival or recovery rates from different time periods or geographic regions may be difficult to accomplish using the Z-tests suggested by Brownie et al. (1985). We propose a general Chi-square statistic that addresses an unambiguous null hypothesis of homogeneity among several survival or recovery rates. With this statistic,...
The relationship of catchment topography and soil hydraulic characteristics to lake alkalinity in the northeastern United States
D.M. Wolock, G.M. Hornberger, K.J. Beven, W.G. Campbell
1989, Water Resources Research (25) 829-837
We undertook the task of determining whether base flow alkalinity of surface waters in the northeastern United States is related to indices of soil contact time and flow path partitioning that are derived from topographic and soils information. The influence of topography and soils on catchment hydrology has been incorporated...
Oligocene and Miocene paleogeography of central California and displacement along the San Andreas fault
S.A. Graham, Richard G. Stanley, J. V. Bent, J. B. Carter
1989, GSA Bulletin (101) 711-730
Recently completed sedimentologic and petrologic studies of Oligocene and Miocene strata in the Temblor Range (San Joaquin basin) and Santa Cruz Mountains (La Honda basin) permit detailed reconstructions of paleogeography, as well as new estimates of displacement along the San Andreas fault. During the Oligocene and Miocene, the San Joaquin...
ROV dives under Great Lakes ice
S. J. Bolsenga, John E. Gannon, Gregory Kennedy, D. C. North, Charles E. Herdendorf
1989, Cold Regions Science and Technology (16) 89-93
Observations of the underside of ice have a wide variety of applications. Severe under-ice roughness can affect ice movements, rough under-ice surfaces can scour the bottom disturbing biota and man-made structures such as pipelines, and the flow rate of rivers is often affected by under-ice roughness. A few...
Influence of coupling of sorption and photosynthetic processes on trace element cycles in natural waters
C. C. Fuller, J.A. Davis
1989, Nature (340) 52-57
Chemical and biological processes have important roles in the transport and cycling of trace elements in natural waters, but their complex interactions are often not well understood. Trace-element concentrations may, for example, be controlled by adsorption-desorption reactions at mineral surfaces, with the equilibrium strongly influenced by pH. Variations in pH...
Assessment of lake trout spawning habitat quality in central Lake Huron by submarine
Bruce A. Manny, Thomas A. Edsall
1989, Journal of Great Lakes Research (15) 164-173
Interstitial water quality was measured using a submersible at seven locations on Six Fathom Bank. Historically, the bank was an important lake trout spawning ground. It is currently the focus of coordinated, interagency efforts to rehabilitate lake trout in Lake Huron. Water quality, evaluated from measurements of...
Behavioural interaction between fish predators and their prey: effects of plant density
Jacqueline F. Savino, Roy A. Stein
1989, Animal Behaviour (37) 311-321
Prey-specific anti-predatory behaviour under different degrees of structural complexity determines foraging success of predators. The behaviour of piscivorous fish (largemouth bass, Micropterus salmoides and northern pike, Esox lucius) and their prey (bluegills, Lepomis macrochirus, and fathead minnows, Pimephales promelas) were quantified in 60-min experiments in laboratory pools (2 multiplied by...
Biogeography of marine podocopid Ostracodes in Micronesia
L.S. Weissleader, N.L. Gilinsky, R. M. Ross, T. M. Cronin
1989, Journal of Biogeography (16) 103-114
Shallow-water podocopic marine Ostracoda from Micronesian lagoons in the Marianas, Caroline, Marshall and Gilbert Islands in the western Pacific were analysed to establish their diversity and zoogeography within Micronesia and the taxonomic affinities with ostracodes from other tropical regions. Sixty-four bottom lagoonal sediment samples from twelve islands and atolls yielded...
A direct correlation among indoor Rn, soil gas Rn and geology in the Reading Prong near Boyertown, Pennsylvania
G.M. Reimer, L.C.S. Gundersen
1989, Health Physics (57) 155-160
We feel that this study suggests a relationship among geology, soil gas Rn and the potential for indoor Rn accumulation in this portion of the Reading Prong. There are deviations from a perfect correlation but these are related to inhomogeneities in the geologic environment and perhaps variations in construction techniques...
Investigations of SPOT cartographic applications in the U.S. Geological Survey
June M. Thormodsgard, Glen G. Kelly, Jeffrey D. Spooner
1989, CISM Journal ACSGC (43) 145-149
The US Geological Survey has a longstanding commitment to the advancement of the technology and applications of remotely sensed data from civilian satellite systems. In the past, research based on satellite data was primarily directed toward natural resource and land use applications rather than cartographic applications. The availability of high-resolution,...
Physical and chemical characteristics of a metal-contaminated overbank deposit, west-central South Dakota, USA
D. C. Marron
1989, Earth Surface Processes and Landforms (14) 419-432
The deposit along the Belle Fourche River is typically up to 2 m thick and extends about 90 m away from the channel along the insides of meander bends. The sediments contain above-background levels of copper, iron, manganese, zinc, and particularly arsenic. An influx at high streamflow of uncontaminated sediment...
Emergence of burrowing urchins from California continental shelf sediments: A response to alongshore current reversals?
F.H. Nichols, D.A. Cacchione, D.E. Drake, J.K. Thompson
1989, Estuarine, Coastal and Shelf Science (29) 171-182
Two sequences of bottom photographs taken every two or four hours for two months during the Coastal Ocean Dynamics Experiment (CODE) off the Russian River, California, reveal the dynamic nature of interations between the water column, the sediments, and benthic organisms in the mid-shelf silt deposit.Time-lapse photographs taken between late...
