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Page 5943, results 148551 - 148575

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Application of gold compositional analyses to mineral exploration in the United States
J.C. Antweiler, W. L. Campbell
1977, Journal of Geochemical Exploration (8) 17-29
Native gold is a mineral composed of Au, Ag and Cu in solid solution and it usually contains one or more trace metals as lattice impurities, as mineral inclusions, in grain boundaries or in surface coatings. Alloy proportions of Au, Ag and Cu, together with certain other elements, can...
Techniques for the conversion to carbon dioxide of oxygen from dissolved sulfate in thermal waters
N.L. Nehring, P.A. Bowen, A.H. Truesdell
1977, Geothermics (5) 63-66
The fractionation of oxygen isotopes between dissolved sulfate ions and water provides a useful geothermometer for geothermal waters. The oxygen isotope composition of dissolved sulfate may also be used to indicate the source of the sulfate and processes of formation. The methods described here for separation, purification and reduction of...
Fluoride content of clay minerals and argillaceous earth materials
Josephus Thomas Jr., H.D. Glass, W.A. White, R.M. Trandel
1977, Clays and Clay Minerals (25) 278-284
A reliable method, utilizing a fluoride ion-selective electrode, is described for the determination of fluoride in clays and shales. Interference by aluminum and iron is minimal. The reproducibility of the method is about ±5% at different levels of fluoride concentration.Data are presented for various clay minerals and for the <2-µm...
Uranium and coexisting element behaviour in surface waters and associated sediments with varied sampling techniques used for uranium exploration
K.J. Wenrich-Verbeek
1977, Journal of Geochemical Exploration (8) 337-355
Optimum sampling methods in surface water and associated sediments for use in uranium exploration are being studied at thirty sites in Colorado, New Mexico, Arizona and Utah. For water samples, filtering is recommended to increase sample homogeneity and reproducibility because for most elements studied water samples which were allowed...
Biogeography of late Silurian and devonian rugose corals
W. A. Oliver Jr.
1977, Palaeogeography, Palaeoclimatology, Palaeoecology (22) 85-135
Three marine benthic faunal realms can be recognized in the Early and Middle Devonian. The Eastern Americas Realm consisted of most of the eastern half of North America and South America north of the Amazon. This realm extended in a southwest direction from the Devonian equator to approximately 35??S and...
Sets of spectral lines for spectrographic thermometry and manometry in d.c. arcs of geologic materials
D. W. Golightly, A. F. Dorrzapf Jr., C. P. Thomas
1977, Spectrochimica Acta Part B: Atomic Spectroscopy (32) 313-325
Sets of 5 Fe(I) lines and 3 Ti(I) Ti(II) line pairs have been characterized for precise spectrographic thermometry and manometry, respectively, in d.c. arcs of geologic materials. The recommended lines are free of spectral interferences, exhibit minimal self absorption within defined concentration intervals, and are useful for chemically-unaltered silicate rocks,...
Cell dimensions and antiferromagnetism of lunar and terrestrial ilmenite single crystals
A. N. Thorpe, J.A. Minkin, F. E. Senftle, Corrine Alexander, Charles Briggs, H. T. Evans Jr., Gordon L. Nord Jr.
1977, Journal of Physics and Chemistry of Solids (38) 115-123
X-Ray diffraction and anisotropic magnetic measurements have been made on single crystals of lunar ilmenite and on terrestrial ilmenite from Bancroft, Ontario, Canada and the Ilmen Mountains, U.S.S.R. The elongated c">c-axis of lunar ilmenite, previously reported, is confirmed by new measurements. The shorter <span...
Reactions of metal ions at surfaces of hydrous iron oxide
J.D. Hem
1977, Geochimica et Cosmochimica Acta (41) 527-538
Cu, Ag and Cr concentrations in natural water may be lowered by mild chemical reduction involving ferric hydroxide-ferrous ion redox processes. V and Mo solubilities may be controlled by precipitation of ferrous vanadate or molybdate. Concentrations as low as 10−8.00 or 10−9.00 M are readily attainable for all these metals in oxygen-depleted...
Ore transport and deposition in the Red Sea geothermal system: a geochemical model
Wayne C. Shanks III, J. L. Bischoff
1977, Geochimica et Cosmochimica Acta (41) 1507-1519
Thermodynamic calculation of distribution of dissolved aqueous species in the Red Sea geothermal brine provides a model of ore transport and deposition in good agreement with observed accumulations of base metal sulfides, anhydrite, and barite.The Red Sea brine is recirculated seawater that acquires high salinity by low-temperature interaction with Miocene...
Further paleomagnetic results for the San Juan volcanic field of southern Colorado
M. E. Beck Jr., S.D. Sheriff, J. F. Diehl, E.A. Hailwood, P. W. Lipman
1977, Earth and Planetary Science Letters (37) 124-130
Combining paleomagnetic data for 17 new sites from the northwest portion of the (Oligocene) San Juan volcanic field of southern Colorado with data for 29 sites previously published yields a paleomagnetic pole at 85°N, 114°E (with a 95% confidence circle of...
Tests for association of transferrin and lactate dehydrogenase phenotypes with weight gain in rainbow trout (Salmo gairdneri)
G. L. Reinitz
1977, Journal of the Fisheries Research Board of Canada (34) 2333-2337
Transferrin (Tf) phenotype was associated with weight gain in 147- and 230-day-old rainbow trout, but no association was found between lactate dehydrogenase (LDH) phenotype and weight gain. A total of 2038 progeny were examined from two different environments. Progeny lots were reared at densities below those known to affect mean...
Effect on tricaine methanesulfonate (MS-222) on hematocrit values in rainbow trout (Salmo gairdneri)
G. L. Reinitz, J. Rix
1977, Comparative Biochemistry and Physiology, Part C: Comparative Pharmacology (56) 115-116
1. Anesthesia of rainbow trout (Salmo gairdneri) with 70 ppm tricaine methanesulfonate (MS-222) for 3-9 min resulted in a linear increase in hematocrit.2. Handling of unanesthetized trout caused a higher and more variable hematocrit reading than did exposure to MS-222 for up to 3 min.3. The range and standard error...
Modeling chloride movement in the alluvial aquifer at the Rocky Mountain Arsenal, Colorado
Leonard F. Konikow
1977, Water Supply Paper 2044
A solute-transport model that can be used to predict the movement of dissolved chemicals in flowing ground water was applied to a problem of ground-water contamination at the Rocky Mountain Arsenal, near Denver, Colo. The model couples a finite-difference solution to the ground-water flow equation with the method-of-characteristics solution to...
Square wave voltammetry at the dropping mercury electrode: Theory
J. H. Christie, J.A. Turner, R. A. Osteryoung
1977, Analytical Chemistry (49) 1899-1903
The theoretical aspects of square wave voltammetry at the dropping mercury electrode are presented. The technique involves scanning the entire potential range of interest on a single drop of a DME. Asymmetries in the waveform as well as variations in current measurement parameters are discussed. Indications are that previous uses...