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  • 1
    Series available for loan
    Series available for loan
    Ottawa
    Associated volumes
    Call number: SR 90.0009(271)
    In: Memoir
    Type of Medium: Series available for loan
    Pages: V, 55 S. + 2 Kt.-Beil.
    Series Statement: Memoir / Geological Survey of Canada 271
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The vein-type gold deposits of middle to late Archean age constitute one of the major sources of gold production in the world. These deposits are highly diverse in character, but are invariably found in proximity to mafic and ultramafic volcanic rocks, and closely associated with tectonically disturbed zones, or ‘breaks’, in the ancient crust. Using the Larder Lake ‘break’ of northern Ontario and Quebec as a model, a general theory of genesis for such deposits is proposed. The Larder Lake ‘break’ is of linear configuration, up to four miles wide, and extending over a distance of approximately 150 miles. Many rich and extensive vein-type gold deposits are associated with it. This ‘break’ is recognized as a highly folded and faulted, dominantly sedimentary stratigraphic unit, formed as part of the development of the Blake River geosyncline of the Abitibi greenstone belt. Faulting is pervasive within the ‘break’ but it is non-continuous. Under an oxygen-poor, somewhat acidic weathering regime believed extant in Archean time, gold and associated constituents, derived as weathering products from mafic and ultramafic volcanics, appear to have been concentrated as solutions and sols in muddy surficial accumulations along a paleo-continental margin. On transfer to a shallow marine environment, the gold-bearing solutions became concentrated mainly as cherty and pyritic evaporitic residues. These residues, infolded and variably metamorphosed and remobilized during ensuing geosynclinal development, formed the numerous and apparently heterogeneous gold deposits of the Larder Lake ‘break’. Mode of redistribution of gold-bearing residues and metamorphism of their host rocks varies widely. In mild form, little vein development is present and original sedimentary features of the host rock are often preserved. In more extreme cases, true hydrothermal veining is evident and complete recrystallization of the host rock has taken place, sometimes to the extent of formation of a melt with intrusive capabilities. In any case, the gold and related vein constituents remain closely associated with the primary host material and alteration effects are largely derived from the recrystallization of original host rock constituents. The suggested mode of genesis clarifies the relationship between various types of ‘break’-related, vein-type gold deposits and offers an explanation of the complex stratigraphy and structure of the ‘break’ environment. It also suggests a penecontemporaneous relationship between the Larder Lake ‘break’ and other auriferous ‘breaks’, of varying configuration, within the Superior Province of the Canadian Shield. The concept can be used advantageously in exploration for new ‘breaks’ and new deposits.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 1357-1358 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The germanium samples, plus standard solutions of the impurities of interest, were irradiated together in a neutron flux of approximately 1012 n/cm2/sec. The period of irradiation was 6 days. On completion of the irradiation the germanium samples were rapidly dissolved in an equal volume mixture of ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 768-770 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the late 1960s Shapiro4'5 recognized that VLBI measurements of the relativistic deflection of signals from extragalactic radio sources by the gravity field of the Sun could potentially yield an accurate estimate of y. The National Oceanic and Atmospheric Administration's POLARIS and IRIS ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 1094-1095 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In our earlier article1 we described our instrumental techniques and discussed a set of observations made in May 1968, using stations DSS 42 at Tidbinbilla, ACT, and DSS 14 at Goldstone, California, when we first found fringes over the trans-Pacific baseline of about 8xl07 wavelengths. The ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 6 (1987), S. 635-637 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 2211-2218 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The preparation of indium phosphide by reactions between separate indium chlorides and phosphine is described. It is shown that the indium monochloride-phosphine reaction is the most favourable of the three possible reactions. It is demonstrated that various growth rates are possible over a range of temperatures, that good morphological layers can be obtained along with reasonable electrical characteristics. Explanations are advanced for the chemical process and the limitations on layer properties encountered.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 4 (1985), S. 497-501 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Speculations in science and technology 21 (1998), S. 187-197 
    ISSN: 1573-9309
    Keywords: Carbon dioxide ; climate change ; radiant energy production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Technology
    Notes: Abstract The present mechanism of radiant energy production in the atmosphere is considered and it is shown that it is not compatible with accepted principles of physics. An alternative mechanism whereby the temperature of the atmosphere and surface of the Earth is regulated by a chemical reaction in the stratosphere is described. It is shown that this mechanism can account for the changes in climate which occurred during the past ten thousand years. The effect on this mechanism of changes in the composition of atmospheric gases, including changes resulting from human activities, is described and the consequences of the changes recorded.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Speculations in science and technology 21 (1998), S. 171-185 
    ISSN: 1573-9309
    Keywords: Carbon dioxide ; crustal penetration by asteroid impact ; geochemical change ; extinction ; high terrain evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Technology
    Notes: Abstract It has been established from geological studies that change in the atmospheric content of carbon dioxide gas commenced about one hundred million years ago. The likely origin of this change is advanced as being the onset of the Brewer circulation caused by the rise in terrain induced by tectonic plate movement. It is demonstrated that tectonic plate movement can be affected by impacts from external bodies which penetrate the crust of the Earth. The consequences of the change in atmospheric concentration of carbon dioxide are proposed as first, extinctions and reductions in animal numbers, including primates, as a result of changes in body chemistry of these animals and second, a change in the rate of weathering of rocks giving rise to changes in the availability of chemicals such as calcium and potassium which are essential for plant and animal life. This latter change contributing to the extinctions and reductions in animal numbers. It is shown that the change in weathering can account for the rise to dominance of angiosperm plants. It is concluded that there were several simultaneous evolutionary environments on Earth which were a function of altitude which gave rise to a vertical variation in atmospheric content of carbon dioxide. This variation disappeared with rise of terrain and the onset of the Brewer circulation. Such changes are advanced and being much more important than any changes in temperature caused by greenhouse effects since the disappearance of atmospheric variations in carbon dioxide allowed animal migration. It is demonstrated that the conditions of extinction could be reintroduced by human activities.
    Type of Medium: Electronic Resource
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