Physio-chemical processes affecting copper, tin and zinc toxicity to algae: A review
James S. Kuwabara
1986, Book chapter, Studies in environmental science
This chapter focuses on the physic-chemical processes affecting copper, zinc, and tin toxicity to algae. Both Cu and Zn are essential algal micronutrients, cofactors in numerous biochemical processes. The availability of a nutrient or toxic substance can be significantly affected by precipitation. Methods for modeling the effects of adsorption–desorption reactions...
Geochronology of augen gneiss and related rocks, Yukon-Tanana terrane, east-central Alaska
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen L. Foster
1986, Geological Society of America Bulletin (97) 626-637
Using several isotopic techniques, we have determined the ages of selected metamorphic rocks in the Yukon-Tanana terrane (YTT) of east-central Alaska. U-Pb zircon data from an augen gneiss body in the Big Delta quadrangle indicate that the granitoid protolith of the gneiss was intruded 341 ± 3 m.y. ago (lower...
Evaluating the structure of habitat for wildlife
H.L. Short, S.C. Williamson
1986, Book chapter, Wildlife 2000: Modeling habitat relationships of terrestrial vertebrates
No abstract available....
Concepts and constraints of habitat model testing
M. Schamberger, J. O'Neil
1986, Book chapter, Wildlife 2000: Modeling habitat relationships of terrestrial vertebrates
No abstract available....
Larval settlement into marine soft-sediment systems: Interactions with the meiofauna
Mary C. Watzin
1986, Journal of Experimental Marine Biology and Ecology (98) 65-113
The distribution and abundance of organisms exhibiting complex life cycles, like marine invertebrates, reflect ecological processes operating at all stages in the life history. Few studies have yet considered the mortality patterns of larvae and juveniles. To test whether the permanent meiofauna play a role in macrofaunal larval site-selection, and/or...
Geophysics: A reversal of geomagnetic polarity
Edward A. Mankinen
1986, Physics Bulletin (37) 287-288
The detailed behaviour of the geomagnetic field during reversals is documented by palaeomagnetists to constrain models of the geomagnetic dynamo. Reversals are studied by measuring the magnetic remanence preserved in rocks to obtain both the direction and intensity of the ancient magnetic field....
Rates of chemical weathering of rocks and minerals
Steven M. Colman, David P. Dethier, editor(s)
1986, Book
Researchers in geomorphology, geochemistry, quaternary geology, soil science, and mineralogy will welcome this volume, the first to focus exclusively on rates of silicate chemical weathering. Consisting largely of previously unpublished data from six countries, the volume examines the latest experimental, modelling, and field results.New information is presented on topics of...
Paleomagnetism of the Tertiary Clarno Formation of central Oregon and its significance for the tectonic history of the Pacific Northwest
C. Sherman Gromme, Myrl E. Beck Jr., Ray E. Wells, David C. Engebretson
1986, Journal of Geophysical Research B: Solid Earth (91) 14089-14103
The Clarno Formation, a mostly Eocene and partly early Oligocene sequence of andesitic lavas and volcaniclastic rocks, is the oldest Tertiary formation exposed in north central Oregon. Remanent magnetization directions at 46 sites in the lavas provide a paleomagnetic pole at 84°N, 278°E with a 95% confidence cone of 7°....
Precambrian basement geology of North and South Dakota
J. S. Klasner, E. R. King
1986, Canadian Journal of Earth Sciences (23) 1083-1102
Combined analysis of drill-hole, gravity, and magnetic data indicates that the buried Precambrian basement rocks of the Dakotas can be divided into several lithotectonic terranes. Eastern North Dakota and northeastern South Dakota are underlain by Archean gneiss. Except for the Black Hills region of South Dakota, where Archean rocks are...
Fluid inclusion from drill hole DW-5, Hohi geothermal area, Japan: Evidence of boiling and procedure for estimating CO2 content
M. Sasada, E. Roedder, H. E. Belkin
1986, Journal of Volcanology and Geothermal Research (30) 231-251
Fluid inclusion studies have been used to derive a model for fluid evolution in the Hohi geothermal area, Japan. Six types of fluid inclusions are found in quartz obtained from the drill core of DW-5 hole. They are: (I) primary liquid-rich with evidence of boiling; (II) primary liquid-rich without evidence...
Upper Pleistocene and Holocene lakes in the An Nafud, Saudi Arabia
E. Schulz, J.W. Whitney
1986, Hydrobiologia (143) 175-190
Two major lake periods were discovered in the sand sea of An Nafud and the surrounding areas. In Upper Pleistocene large lakes occurred around the dune area and in the interior of the sand sea. Their deposits were formed between 34 000 and 24 000 BP. The lakes were not...
U-Pb geochronology of two augen gneiss terranes, Idaho: New data and tectonic implications
K. V. Evans, L. B. Fischer
1986, Canadian Journal of Earth Sciences (23) 1919-1927
U–Pb isotopic analyses of cogenetic zircon suites revise the ages of two augen gneiss terranes in central and northern Idaho. The augen gneiss of Priest River yields an upper-intercept concordia age for only moderately discordant zircons of 1576 ± 13 Ma; there is no evidence of an inherited xenocrystic lead component. Because this...
A comparison of two methods for determining copper partitioning in oxidized sediments
Samuel N. Luoma
1986, Marine Chemistry (20) 45-59
Model estimations of the proportion of Cu in oxidized sediments associated with extractable organic materials show some agreement with the proportion of Cu extracted from those sediments with ammonium hydroxide. Data were from 17 estuaries of widely differing sediment chemistry. The modelling and extraction methods agreed best where concentrations of...
Magnesioferrite from the Cretaceous-Tertiary boundary, Caravaca, Spain
B.F. Bohor, E.E. Foord, R. Ganapathy
1986, Earth and Planetary Science Letters (81) 57-66
Magnesioferrite grading toward magnetite has been identified as a very small but meaningful constituent of the basal iron-rich portion of the Cretaceous-Tertiary (K-T) boundary clay at the Barranco del Gredero section, Caravaca, Spain. This spinel-type phase and others of the spinel group, found in K-T boundary clays at many widely...
Vegetation, climatic and floral changes at the Cretaceous-Tertiary boundary
J. A. Wolfe, G.R. Upchurch Jr.
1986, Nature (324) 148-152
he western interior of North America has the only known non-marine sections that contain the iridium-rich clay interpreted as the Cretaceous-Tertiary (K-T) boundary1-7. Because vegetation and climate can be directly inferred from physiognomy of leaves8-15 and because leaf species typically represent low taxonomic categories, studies of leaf floras in these...
Local Magnetic Fields, Uplift, Gravity, and Dilational Strain Changes in Southern California
M.J.S. Johnston
1986, Journal of Geomagnetism & Geoelectricity (38) 933-947
Measurements of regional magnetic field during gravity, strain and leveling surveys near the San Andreas fault at Cajon, Palmdale and Tejon are strongly correlated with changes in gravity, areal strain, and uplift in these regions during the period 1977-1984. This correlation principally depends on data taken during 1978-79...
Recovering fresh water stored in saline limestone aquifers
M. L. Merritt
1986, Ground Water (24) 516-529
Numerical modeling techniques are used to examine the hydrogeologic, design, and management factors governing the recovery efficiency of subsurface fresh-water storage. The modeling approach permitted many combinations of conditions to be studied. A sensitivity analysis was used that consisted of varying certain parameters while keeping constant as many other parameters...
Shallow subsurface temperature surveys in the Basin and Range province, U.S.A.-I. Review and evaluation
F. H. Olmsted, A. H. Welch, S. E. Ingebritsen
1986, Geothermics (15) 251-265
Temperature surveys at depths of 1–2 m have had varying success in geothermal exploration in the Basin and Range province. The most successful surveys have identified patterns of near-surface thermal-fluid flow within areas of less than 2 km2. Results have been less consistent in larger areas where zones of hydrothermal...
Evidence for equilibrium conditions during the partitioning of nickel between olivine and komatiite liquids.
J. R. Budahn
1986, American Mineralogist (71) 1337-1342
Olivine-liquid partition coefficients for Ni(DNi), calculated from Ni vs MgO abundance variations in komatiite series basalts, compare favourably with experimentally determined values, if Ni variations in olivine-controlled basalts can be modelled with an equation that assumes equilibrium between the entire olivine crystal and its coexisting liquid.-J.A.Z....
Mass balance and sliding velocity of the Puget lobe of the cordilleran ice sheet during the last glaciation
D. B. Booth
1986, Quaternary Research (25) 269-280
An estimate of the sliding velocity and basal meltwater discharge of the Puget lobe of the Cordilleran ice sheet can be calculated from its reconstructed extent, altitude, and mass balance. Lobe dimensions and surface altitudes are inferred from ice limits and flow-direction indicators. Net annual mass balance and total ablation...
Obstacles facing the venus radar mapper - The implications of gestalt formation in stereo-radargrammetry
R.L. Wildey
1986, Earth, Moon and Planets (35) 47-54
The question of adapting to radar images the existing hardware that form topographic maps through stereo-photogrammetric models, is examined in principle. Such hardware utilizes a human/ computer hybrid. Although the problem of brightness differentials between corresponding landmarks can be dealt with pseudo-photoclinometrically, the main problem is whether the perspective in...
Uranium series disequilibrium in a young surficial uranium deposit, northeastern Washington, U.S.A.
R. A. Zielinski, C. A. Bush, J.N. Rosholt
1986, Applied Geochemistry (1) 503-511
A recently discovered ore-grade accumulation of U in organic-rich sediments of late Quaternary age provides an opportunity for studying the early association of U, U-daughters, and organic matter in a natural setting. The U occurs in valley-fill sediments of peat, peaty clay, silt, and sand along the north fork of...
Partition coefficients of Hf, Zr, and REE between zircon, apatite, and liquid
H. Fujimaki
1986, Contributions to Mineralogy and Petrology (94) 42-45
Concentration ratios of Hf, Zr, and REE between zircon, apatite, and liquid were determined for three igneous compositions: two andesites and a diorite. The concentration ratios of these elements between zircon and corresponding liquid can approximate the partition coefficient. Although the concentration ratios between apatite and andesite groundmass can be...
Fumarole emissions at Mount St. Helens volcano, June 1980 to October 1981: Degassing of a magma-hydrothermal system
T.M. Gerlach, T. J. Casadevall
1986, Journal of Volcanology and Geothermal Research (28) 141-160
This study is an investigation of the chemical changes in the Mount St. Helens fumarole gases up to October 1981, the sources of the fumarole gases, and the stability of gas species in the shallow magma system. These problems are investigated by calculations of element compositions, thermodynamic equilibria, and magmatic...
Isotopic variation in the Tuolumne Intrusive Suite, central Sierra Nevada, California
R. W. Kistler, B. W. Chappell, D. L. Peck, P. C. Bateman
1986, Contributions to Mineralogy and Petrology (94) 205-220
Granitoid rocks of the compositionally zoned Late Cretaceous Toulumne Intrusive Suite in the central Sierra Nevada, California, have initial87Sr/86Sr values (Sri) and143Nd/144Nd values (Ndi) that vary from 0.7057 to 0.7067 and from 0.51239 to 0.51211 respectively. The observed variation of both Sri and Ndi and of chemical composition in rocks...
