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  • 1
    Monograph available for loan
    Monograph available for loan
    Gold-related geology in the Kirkland lake and Timmins camps (1990)
    Ottawa
    Associated volumes
    Details Availability
    Call number: 9/GA 105
    In: Open file report / Geological Survey of Canada
    Type of Medium: Monograph available for loan
    Pages: 57 S. : graph. Darst.
    Series Statement: (Geological Survey of Canada : Open File 2160) (Field Trip Guidebook 5)
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Archaean magmatic sulphate (1986)
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 45-47 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Occurrences of sulphate minerals in Archaean terrane (Table 1) have been divided into vein and stratiform types. These are mainly barite or anhydrite. Where gypsum is found, it appears to have formed by hydration of primary anhydrite at low temperatures. It is important to establish first that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/319045a0
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  • 3
    Electronic Resource
    Electronic Resource
    Sulphur isotope abundances in Aphebian clastic rocks: implications for the coeval atmosphere (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 323-326 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Huronian Supergroup of early Aphebian age occurring in the Elliot Lake area, Ontario, was deposited between -2,200 and 2,500 Myr BP based on ages of intrusives in the sedimentary rocks9'10 and the latest granite in Archaean terrain (see Table 1 and refs 9, 10). The Matinenda formation, the base ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302323a0
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  • 4
    Electronic Resource
    Electronic Resource
    Protective Effect of Ozone in Mice against Whole-body X-irradiation (1963)
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 1220-1220 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adult male albino mice (^^4-2 strain) were used (18-20 g). The animals were placed in a large exposure chamber of 1-5 ft.3 capacity. The ozone was generated from silica-gel dried air in a commercial ozonizer and driven into a mixing chamber where the ozone concentration was controlled by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1981220a0
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  • 5
    Electronic Resource
    Electronic Resource
    Osmium isotope ratios of PGM grains associated with the Freetown Layered Complex, Sierra Leone, and their origin (1991)
    Springer
    Contributions to mineralogy and petrology 109 (1991), S. 10-18 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Osmium isotope ratios for two types of platinum group mineral (PGM) nuggets of eluvial (residual) origin, associated with the Freetown Layered Gabbro Complex, were determined in-situ using an ion microprobe. The values for erlichmanite nuggets are ≈1.08. Those for PGM inclusions in Pt−Fe alloy nuggets are higher, ranging from 1.2 to 2.1. Ratios of187Os/186Os vary between the nuggets, but they are consistent within individual nuggest. The data suggest early formation of the erlichmanite nuggets, prior to a postulated substantial contribution of crustal Os. The Pt−Fe alloy nuggets, on the other hand, were formed later in a residual melt which was contaminated by crustal Os due to the assimilation (〈10%) or the gaseous/fluid transport of Os from Archaean host rocks into the magma. The lack of systematic mineralogical and chemical changes of the Complex and extensive granulitization in the adjacent host rocks and xenoliths may favor the latter process. The lack of high187Os/186Os ratios, consistent187Os/186Os values within individual nuggets and their textures and mineralogy suggest that the studied PGM nuggets were not formed during lateritization or in low-temperature depositional environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687197
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  • 6
    Electronic Resource
    Electronic Resource
    Meteoric hydrothermal origin of calcites in “Green Tuff” formations, Miocene age, Japan (1980)
    Springer
    Contributions to mineralogy and petrology 73 (1980), S. 145-150 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Oxygen and carbon isotope compositions were determined for calcites from the “Green Tuff” formations of Miocene age in Japan. Values of δ 18O from 24 calcites in altered rocks from 5 districts range from −2 to +16‰SMOW, in most cases from 0 to +8‰SMOW. The low δ 18O values rule out the possibility of their low-temperature origin or any significant contribution of magmatic fluid in the calcite precipitation. These values, coupled with their mineral assemblages, suggest that the calcites formed from meteoric hydrothermal solutions which caused propylitic alteration after the submarine strata became emergent. Values of δ 13C from the calcites show a wide variation from −17 to 0‰PDB. Calcites from different districts have different ranges of δ 13C values, indicating that there was no homogeneous reservoir of carbon at the time the calcite formed, and that the carbon had local sources. Carbon isotopic compositions of calcite within ore deposits in the “Green Tuff” formations range from −19 to 0‰PDB, similar to those of calcite in the altered rocks in the same district, suggesting that the carbon in ore calcites was likely supplied from the surrounding rocks through activity of meteoric hydrothermal solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371389
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  • 7
    Electronic Resource
    Electronic Resource
    Marine hdrothermal alteration at a Kuroko ore deposit, Kosaka, Japan (1980)
    Springer
    Contributions to mineralogy and petrology 74 (1980), S. 285-292 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Isotopic compositions were determined for quartz, sericite and bulk rock samples surrounding the Uwamuki no. 4 Kuroko ore body, Kosaka, Japan. δ 18O values of quartz from Siliceous Ore (S.O.), main body of Black Ore B.O.) and the upper layer of B.O. are fairly uniform, +8.7 to +10.5‰. Formation temperatures calculated from fractionation of 18O between sericite and quartz from B.O. and upper S.O. are 250° to 300° C. The ore-forming fluids had δ 18O values of +1‰ and δD values of −10‰, from isotope compositions of quartz and sericite. Tertiary volcanic rocks surrounding the ore deposits at Kosaka have uniform δ 18O values, +8.1±1.0‰ (n=50), although their bulk chemical compositions are widely varied because of different degrees of alteration. “White Rhyolite”, which is an intensely altered rhyolite occurring in close association with the Kuroko ore bodies, has also uniform δ 18O values, +7.9±0.9‰ (n=19). Temperatures of alteration are estimated to be around 300° C from the oxygen isotope fractionation between quartz and sericite. Paleozoic basement rocks phyllite and chert, have high δ 18O values, +18 and +19‰. The Sasahata formation of unknown age, which lies between Tertiary and Paleozoic formations, has highly variable δ 18O, +8 to +16‰ (n=4). High δ 18O values of the basement rocks and the sharp difference in δ 18O at their boundary suggest that the hydrothermal system causing Kuroko mineralization was mainly confined within permeable Tertiary rocks. δD values of altered Tertiary volcanic rocks are highly variable ranging from −34 to −64% (n=12). The variation of δD does not correlate with change of chemical composition, δ 18O values, nor distance from the ore deposits. The relatively high δD values of the altered rocks indicate that the major constituent of the hydrothermal fluid was sea water. However, another fluid having lower δD must have also participated. The fluid could be “evolved” sea water modified by interaction with rocks and the admixture of magmatic fluid. The variation in δD may suggest that sea water mixed dispersively with the fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371698
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  • 8
    Electronic Resource
    Electronic Resource
    Diverse metal sources of Archaean gold deposits: evidence from in situ lead-isotope analysis of individual grains of galena and altaite in the Ross and Kirkland Lake deposits, Abitibi Greenstone belt, Canada (1993)
    Springer
    Contributions to mineralogy and petrology 113 (1993), S. 185-195 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Lead isotope compositions for individual grains of galena and altaite (PbTe) were determined in situ using a secondary ion mass spectrometer (SIMS). Galena was collected from the Ross deposit and altaite from the Kirkland Lake (KL) deposits in the southern Abitibi greenstone belt, Superior Province of Canada. The samples from KL are more radiogenic than those from the Ross deposit. Isotopic compositions vary significantly between different grains in each deposit and form broad linear arrays in 207Pb/204Pb-206Pb/204Pb and 208Pb/204Pb-206Pb/204Pb diagrams. The linear arrays of Pb-isotope data are attributed to mixing of Pb from different sources. At least two sources are required for individual deposits: one with low U/Pb and Th/Pb ratios and the other with high ratios. Lead minerals occurring with Au are less radiogenic than those that are not obviously associated with Au, suggesting that Au was supplied from low U/Pb sources such as sulphides or older ultramafic-mafic rocks. While most data are consistent with the derivation from local rocks, highly radiogenic Pb with relatively low 207Pb/206Pb ratios recorded at KL require post-Archaean mineralization or derivation of the Pb from an unusual crustal source with low μ. The latter interpretation is favored because of the lack of textural evidence and because it is difficult to dissolve and precipitate altaite at low temperatures. The presence of a Pb reservoir with low μ is also inferred from the data of Archaean banded iron formations and volcanogenic massive sulphide deposits. Different isotopic patterns of the two deposits suggest different sources of metals in the two deposits. While this conclusion does not reject the derivation of fluids from the lower crust or mantle, the data are not in accord with conceptual models invoking a common source reservoir for metals. The study suggests that fluids, which may have a common origin, leached metals and other constituents from the upper crustal rocks during their ascent. The proposed model, different origins for different constituents, explains much of the conflicting evidence presented by Archaean Au deposits, including provinciality of mineralogy and relatively uniform fluid inclusion and C-isotope data from many Au deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283227
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  • 9
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    Geochemical responses in peat groundwater over Attawapiskat kimberlites, James Bay Lowlands, Canada and their application to diamond exploration (2011)
    Geological Society of London
    Details
    Publication Date: 2011-08-01
    Description: Peat groundwater compositions at depths of 0.4 and 1.1 m below ground surface in the Attawapiskat region of the James Bay Lowlands are evaluated for diamond exploration applications. Samples were collected along transects that typically extended at least 200 m beyond the margins of Yankee, Zulu, and Golf kimberlites. Locations of upwelling groundwater usually occur at or near kimberlite margins based on hydrogeological measurements and variations in peat groundwater geochemical parameters (pH and EC are high, and the Eh is low relative to ombrotrophic peat groundwaters). Concentrations of the kimberlite pathfinder metals Ni, Cr, light rare earth elements (LREEs), Ba, Mg/Ca, and alkalis are commonly elevated at sample sites at or near kimberlite margins and where groundwaters are upwelling. The presence of elevated kimberlite pathfinders at these sites suggests that fractures along the boundaries between kimberlites and limestone formed during kimberlite emplacement provide dilation for upward movement of groundwater with elevated kimberlite pathfinder metals. Typically, Ni, Cr, LREE, and Ba behave similarly and thus high concentrations of these metals are found at similar locations along transects. On the other hand, locations of elevated alkalis and Mg/Ca vary. The spatial variations among pathfinder metals in peat groundwaters are possibly due to geochemical processes in the peat, such as metal binding to dissolved organic material, adsorption to insoluble organics or Fe-oxyhydroxides, and incorporation into secondary mineral precipitates, which can act to increase or decrease metal solubility. The findings of this study are readily applicable in diamond exploration in wetlands elsewhere.
    Print ISSN: 1467-7873
    Electronic ISSN: 1467-7873
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 10
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    Multifunctional Octamethyltetrasila[2.2]cyclophanes: Conformational Variations, Circularly Polarized Luminescence, and Organic Electroluminescence (2017)
    American Chemical Society (ACS)
    Details
    Publication Date: 2017-08-04
    Description: Journal of the American Chemical Society DOI: 10.1021/jacs.7b05671
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society (ACS)
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