High temperature annealing of fission tracks in fluorapatite, Santa Fe Springs oil field, Los Angeles Basin, California
Nancy D. Naeser, Kevin D. Crowley, Thane H. McCulloh, Chris M. Reaves
Couchot PierreFromm M.Chambaudet A.Rebetez M.Van den haute Peteret al, editor(s)
1990, International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements (17) 424
Annealing of fission tracks is a kinetic process dependent primarily on temperature and to a laser extent on time. Several kinetic models of apatite annealing have been proposed. The predictive capabilities of these models for long-term geologic annealing have been limited to qualitative or semiquantitative at best, because of uncertainties...
Recent uplift and hydrothermal activity at Tangkuban Parahu volcano, west Java, Indonesia
J. Dvorak, J. Matahelumual, A.T. Okamura, H. Said, T. J. Casadevall, D. Mulyadi
1990, Bulletin of Volcanology (53) 20-28
Tangkuban Parahu is an active stratovolcano located 17 km north of the city of Bandung in the province west Java, Indonesia. All historical eruptive activity at this volcano has been confined to a complex of explosive summit craters. About a dozen eruptions-mostly phreatic events- and 15 other periods of unrest,...
Peridinialean dinoflagellate plate patterns, labels and homologies
Lucy E. Edwards
1990, Review of Palaeobotany and Palynology (65) 293-303
Tabulation patterns for peridinialean dinoflagellate thecae and cysts have been traditionally expressed using a plate labelling system described by C.A. Kofoid in the early 1900's. This system can obscure dinoflagellate plate homologies and has not always been strictly applied. The plate-labelling system presented here introduces new series labels but incorporates...
Petrology, isotope characteristics, and K-Ar ages of the Maranhão, northern Brazil, Mesozoic basalt province
R.V. Fodor, A.N. Sial, S.B. Mukasa, E.H. McKee
1990, Contributions to Mineralogy and Petrology (104) 555-567
Northern Brazil contains remnants of Mesozoic flood basalts and hypabyssal rocks that were apparently emplaced during tectonism related to opening of the Atlantic Ocean. Analyses and new K-Ar ages reveal that this ∼700x250 km Maranhão province (5°–8°S) has low-Ti basalts (∼1.1 wt% TiO2) in the western part that range...
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...
Trace element and isotopic constraints on magmatic evolution at Lassen volcanic center
T.D. Bullen, M.A. Clynne
1990, Journal of Geophysical Research Solid Earth (95) 19671-19691
Magmatic evolution at the Lassen volcanic center (LVC) is characterized by a transition from predominantly andesitic to predominantly silicic volcanism with time. Magmas of the andesitic, or “Brokeoff phase” of volcanism range in composition from basaltic andesite io dacite, whereas those of silicic, or “Lassen phase” range in composition from...
Ancient channels of the Susquehanna River beneath Chesapeake Bay and the Delmarva Peninsula
Steven M. Colman, J.P. Halka, C. H. Hobbs III, R. B. Mixon, D.S. Foster
1990, Geological Society of America Bulletin (102) 1268-1279
The trunk channels of each system are 2 to 4 km wide and are incised 30 to 50 m into underlying strata; they have irregular longitudinal profiles and very low gradients within the Chesapeake Bay area. The youngest paleochannel is clearly of late Wisconsinan age, about 18 ka, and the...
Organic matter in hydrothermal metal ores and hydrothermal fluids
W. H. Orem, E.C. Spiker, R. K. Kotra
1990, Applied Geochemistry (5) 125-134
Massive polymetallic sulfides are currently being deposited around active submarine hydrothermal vents associated with spreading centers. Chemoautolithotrophic bacteria are responsible for the high production of organic matter also associated with modern submarine hydrothermal activity. Thus, there is a significant potential for...
Age of the Peach Springs Tuff, southeastern California and western Arizona
J. E. Nielson, D. R. Lux, G. B. Dalrymple, A. F. Glazner
1990, Journal of Geophysical Research Solid Earth (95) 571-580
Sanidine separates from pumice of the early Miocene Peach Springs Tuff are concordantly dated at 18.5±0.2 Ma by two isotopic techniques. The Peach Springs Tuff is the only known unit that can be correlated between isolated outcrops of Miocene strata from the central Mojave Desert of southeastern California to the...
Holocene paleoclimatic evidence and sedimentation rates from a core in southwestern Lake Michigan
Steven M. Colman, Glenn A. Jones, R. M. Forester, D.S. Foster
1990, Journal of Paleolimnology (4) 269-284
Preliminary results of a multidisciplinary study of cores in southwestern Lake Michigan suggest that the materials in these cores can be interpreted in terms of both isostatically and climatically induced changes in lake level. Ostracodes and mollusks are well preserved in the Holocene sediments, and they provide paleolimnologic and paleoclimatic...
Effect of anelastic and scattering structures of the lithosphere on the shape of local earthquake coda
B. Chouet
1990, Pure and Applied Geophysics PAGEOPH (132) 289-310
A simple model of single acoustic scattering is used to study the dependence of the shape of local earthquake coda on the anelastic and scattering structures of the lithosphere. The model is applied to the coda of earthquakes located near Stone Canyon, central California, and provides an explanation for the...
Multivariate statistical analysis of stream-sediment geochemistry in the Grazer Paläozoikum, Austria
L. Weber, J.C. Davis
1990, Mineralium Deposita (25) 213-220
The Austrian reconnaissance study of stream-sediment composition — more than 30000 clay-fraction samples collected over an area of 40000 km2 — is summarized in an atlas of regional maps that show the distributions of 35 elements. These maps, rich in information, reveal complicated patterns of element abundance that are difficult...
Qualitative and numerical analyses of the effects of river inflow variations on mixing diagrams in estuaries
L.A. Cifuentes, L. E. Schemel, J.H. Sharp
1990, Estuarine, Coastal and Shelf Science (30) 411-427
The effects of river inflow variations on alkalinity/salinity distributions in San Francisco Bay and nitrate/salinity distributions in Delaware Bay are described. One-dimensional, advective-dispersion equations for salinity and the dissolved constituents are solved numerically and are used to simulate mixing in the estuaries. These simulations account for time-varying river inflow, variations...
Lead hazards within the range of the California condor
O. H. Pattee, P.H. Bloom, J. M. Scott, M. R. Smith
1990, The Condor (92) 931-937
The prevalence of lead in Golden Eagles (Aquila chrysaetos) occurring within the recent historical range of the California Condor (Gymnogyps californianus) was determined by analyzing blood samples from 162 Golden Eagles captured between June 1985 and December 1986 at three sites. We found no significant differences between sex and age...
Mineralogy and geochemistry of altered rocks associated with Lemitar carbonatites, central New Mexico, U.S.A.
V. T. McLemore, P.J. Modreski
1990, LITHOS (26) 99-113
The intrusion of more than 100 Cambrian-Ordovician carbonatite dikes caused minor alteration of Proterozoic granitic and mafic rocks in the Lemitar Mountains, although hematization, carbonatization and fenitization caused extensive alteration locally. Ampibolites within 15-20 m of the carbonatite dike contacts were highly altered by carbonatization. Locally the Lemitar diorite/gabbro adjacent...
Shallow structure and deformation along the San Andreas Fault in Cholame Valley, California, based on high-resolution reflection profiling
K. M. Shedlock, T.M. Brocher, S.T. Harding
1990, Journal of Geophysical Research (95) 5003-5020
The mapped active traces of the San Andreas fault are separated by a 1-km-wide right-stepping offset in Cholame Valley. The geometry of this offset, defined in other strike-slip systems as a releasing bend or a dilational jog, has resulted in the formation of a pullapart basin. Various researchers have inferred...
Growth and equilibrium in sea otter populations
J. A. Estes
1990, Journal of Animal Ecology (59) 385-400
(1) Counts through time were compiled for five sea otter (Enhydra lutris) populations in the north-east Pacific Ocean that were below equilibrium density: Attu Island, south-east Alaska, British Columbia, Washington State, and central California. Similar data were obtained from the equilibrium density population at Amchitka Island in 1971 and 1986....
Hydrologic and hydraulic research in mountain rivers
Robert D. Jarrett
1990, Water Resources Bulletin (26) 419-429
Although our current (1990) knowledge of hydrologic and hydraulic processes is based on many years of study, there are river environments where these processes are complex and poorly understood. One of these environments is in mountainous areas, which cover about 25 percent of the United States. Use of conventional hydrologic...
Thermal history of rocks in southern San Joaquin Valley, California: evidence from fission-track analysis
Nancy D. Naeser, Charles W. Naeser, Thane H. McCulloh
1990, American Association of Petroleum Geologists Bulletin (74) 13-29
The theory of the fission-track method and its application to sedimentary basin analysis is illustrated by a case study in the southern San Joaquin Valley, California. Fission tracks provide a powerful tool for studying the thermal history of sedimentary basins because the two minerals most commonly used in fission-track studies,...
Can we determine the biological availability of sediment-bound trace elements?
Samuel N. Luoma
1989, Hydrobiologia (176) 379-396
It is clear from available data that the susceptibility of biological communities to trace element contamination differs among aquatic environments. One important reason is that the bioavailability of metals in sediments appears to be altered by variations in sediment geochemistry. However, methods for explaining or predicting the effect of sediment...
Prevention of infectious diseases in aquaculture
W. Ahne, J. R. Winton, T. Kimura
1989, Journal of Veterinary Medicine, Series B (36) 561-567
Infectious diseases remain one of the most important limitations to the successful propagation of aquatic animals. Most of the losses caused by pathogens in aquaculture could be prevented by health inspection, adequate environment and sound management practices. Effective control measures, mainly based upon 1) avoidance of pathogens 2) modification of...
Animal population dynamics: Identification of critical components
J.M. Emlen, E.K. Pikitch
1989, Ecological Modelling (44) 253-273
There is a growing interest in the use of population dynamics models in environmental risk assessment and the promulgation of environmental regulatory policies. Unfortunately, because of species and areal differences in the physical and biotic influences on population dynamics, such models must almost inevitably be both complex and species- or...
Terrestrial population models for ecological risk assessment: A state-of-the-art review
J.M. Emlen
1989, Environmental Toxicology and Chemistry (8) 831-842
Few attempts have been made to formulate models for predicting impacts of xenobiotic chemicals on wildlife populations. However, considerable effort has been invested in wildlife optimal exploitation models. Because death from intoxication has a similar effect on population dynamics as death by harvesting, these management models are applicable to ecological...
Development, characterization, and use of monoclonal and polyclonal antibodies against the myxosporean, Ceratomyxa shasta
J. L. Bartholomew, J. S. Rohovec, J. L. Fryer
1989, Journal of Eukaryotic Microbiology (36) 397-401
Both monoclonal and polyclonal antisera were produced against Ceratomyxa shasta. Ascites containing trophozoites of the parasite was collected from infected fish and used as antigen for immunization of mice. The resulting monoclonal antibodies reacted specifically with trophozoite and sporoblast stages but did not react with C. shasta spores by either...
Behavior of fish predators and their prey: Habitat choice between open water and dense vegetation
Jacqueline F. Savino, Roy A. Stein
1989, Environmental Biology of Fishes (24) 287-293
Behavior of largemouth bass, Micropterus salmoides, and northern pike, Esox lucius, foraging on fathead minnows, Pimephales promelas, or bluegills, Lepomis macrochirus, was quantified in pools with 50% cover (half the pool had artificial stems at a density of 1000 stems m−2). Both predators spent most of...
