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  • 1
    Electronic Resource
    Electronic Resource
    The crystal structure of the serpentine mineral, lizardite Mg3Si2O5(OH)4 (1965)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 19 (1965), S. 381-389 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X65003493
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  • 2
    Electronic Resource
    Electronic Resource
    Geological Expedition to the Tertiary Basalt Region of Scoresby Sund, East Greenland (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 603-604 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Several earlier expeditions, dating from the discovery of Scoresby Sund in 1822, have visited the northern and eastern margins of the lava field1-4 and petrological investigations have been made of Tertiary basalts from localities north of the present field area5'6. The 1965 expedition, however, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212603a0
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  • 3
    Electronic Resource
    Electronic Resource
    Mineralogy and microstructures of carbonaceous gold ores (1987)
    Springer
    Mineralogy and petrology 36 (1987), S. 219-239 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé Ce compte rendu s'intéresse au gîtes carbonifères d'or, spécialement dans la ceinture de roches vertes de l'Abitibi au nord de l'Ontario, au Canada. Des observations pétrographiques sont combinées avec des analyses de microsonde électronique afin de décrire quelques aspects de la minéralogie et de la géologie des mines d'or; en particulier Owl Creek et Hoyle Pond, et aussi des emplacements dont la concentration en or est trop faible pour être exploité. Trois générations de pyrite sont observée à Owl Creek, la troisième contenant de l'or. Souvent l'or est situé entre la veine de quartz et l'encaissante carbonifère, fréquemment avec de l'hydromicas sodiques, de la chlorite ferrifère et de la tourmaline. Cette association dont l'importance économique est substantielle, est produite par la concentration de fluides hydrothermales à travers des rocs carbonifères friables.
    Notes: Summary This paper describes mineralogical and geological aspects of the Owl Creek and Hoyle Pond gold mines, located in Archean metasediments and metavolcanics in the Abitibi greenstone belt in northern Ontario, Canada. The occurrence of “invisible gold” of Cenozoic age, hosted in structurally-controlled settings in Paleozoic strata of the southwestern U.S.A., has been known and exploited for over thirty years. Petrographic observations are combined with electron microprobe data in order to describe aspects of gold mineralization from these Ontario mines and from selected analogous sites elsewhere. Details of selected exposures of Archean-Proterozoic lithologies, which are carbonaceous but not strongly enriched in gold, are briefly compared with features of the mine geology. Although no mine generates carbonaceous ores alone, the proportion of such ores varies widely from mine to mine, and district to district. Questions remain, particularly with regard to the chemical behaviour of the reduced carbon, but two common factors of prime economic relevance are established. These are the importance of (a) fluid focusing through incompetent carbonaceous units, and (b) localization of high (commonly visible) gold values on vein-wallrock contacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01163261
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  • 4
    Electronic Resource
    Electronic Resource
    Intergrowths of nepheline-potassium feldspar and kalsilite-potassium feldspar: A re-examination of the ‘pseudo-leucite problem’ (1980)
    Springer
    Contributions to mineralogy and petrology 73 (1980), S. 119-126 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The alkalic ultramafic Batbjerg intrusion of East Greenland contains rocks in which nepheline and leucite are important constituents. In addition, there are vermicular, ‘finger print’ intergrowths of nepheline with potassium feldspar, and patchy to micrographic intergrowths of kalsilite with potassium feldspar. The history of the ‘pseudoleucite problem’ is reviewed, and it is suggested that the term pseudoleucite be restricted to intergrowths of nepheline with alkali feldspar that appear to be pseudomorphs with the crystal morphology of leucite. It is further suggested that flame-like or feather-like finger print intergrowths of nepheline with alkali feldspar, that are either interstitial to the other minerals of the rock or have grown perpendicularly on relative large and often euhedral nepheline grains are an entirely different problem and are best explained by late-stage magmatic crystallization within the system NaAlSiO4-KAlSiO4-SiO2-H2O. In the Batbjerg intrusion the early crystallization of nepheline was followed by the co-crystallization of nepheline with leucite, or in some cases by nepheline and a silica-rich leucite. Although the magma was essentially dry, as indicated by the dominantly pyroxenitic character of the rocks, water pressure rose toward the late stages of crystallization as indicated by the presence of phlogopite and occasionally both amphibole and zeolite. Shrinkage of the leucite stability field attendant upon this rise in $$P_{H_2 O}$$ left the liquid that was crystallizing nepheline and leucite stranded on the nepheline-alkali feldspar cotectic. Shrinkage occurred too rapidly for the liquid to remain at the reaction point of the system, and leucite, therefore, was not resorbed. The remaining liquid crystallized rapidly as ‘flames’ of vermicular intergrowth of nepheline with potassium feldspar (composition Ne 24.0, Ks 45.9, Qz 30.1), a texture that might be attributable to supercooling. Silica-rich leucite compositions (Ks 68.8, Qz 31.2) decomposed to intergrowths of kalsilite with potassium feldspar but reaction kinetics, or possibly variations in $$P_{H_2 O}$$ throughout the intrusion, prevented the breakdown of leucite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371386
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  • 5
    Electronic Resource
    Electronic Resource
    The role of chlorine in serpentinization (1977)
    Springer
    Contributions to mineralogy and petrology 65 (1977), S. 39-44 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Chlorine present in altered ultramafic rocks resides in a compound which is readily soluble in neutral and acidic aqueous solution. Iron is also dissolved by the same solutions giving Fe∶Cl = 2∶1. Statistical treatment of multiple microprobe analyses shows a positive correlation between Cl and Fe, and negative correlations between Cl and Mg, and Cl and Si. These, and other data, suggest that Cl is present in the form of submicroscopic grains of a compound for which a likely formula is Fe2(OH)3Cl, and which is dispersed through the regions of the rock suffering active alteration. Elsewhere, where alteration is complete the chloride phase is absent. A mechanism is proposed whereby initially acid chlorine bearing solutions become alkaline in bringing about the conversion of olivine to serpentine and at the same time transfer Fe into Fe2(OH)3Cl which precipitates in the reaction zone. Fresher, acid, solutions, following as the reaction front progresses, dissolve the Fe2(OH)3Cl phase, providing a possibility for long distance transport of Fe and recycling of Cl. pH gradients near the reaction zone may be matched by fO2 gradients which may bring about the formation of magnetite in the centres of veins between the olivine crystals. All evidence of Cl will be removed when the process is complete, and the serpentine which forms will usually have Fe/Mg greater than the original olivine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373568
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  • 6
    Electronic Resource
    Electronic Resource
    Secondary ion mass spectrometry at close to single-atom concentration using DC acceleratorsPaper presented at the Fifth Conference on the Application of Small Acceerators, Denton, Texas, 6-8 November 1978. (1979)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 1 (1979), S. 12-19 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Experiments have been conducted which show that secondary ion mass spectrometry (SIMS), together with the addition of a rather low voltage (2 MV) DC accelerator, can become an extremely powerful new technique in many fields of research related to the characterization of surface and bulk solids and with high spatial resolution. The technology is available today to build an instrument that would have high lateral resolution (∼ 1 μm) coupled with a secondary ion transmission coefficient from target to detector 〉10% with no mass interferences from molecular ions. Molecular ions can be fragmented and analyzed separately. We believe that this combination of secondary ion mass spectrometers and accelerators represents a most significant advance in analytical techniques.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740010104
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  • 7
    Electronic Resource
    Electronic Resource
    Automatic X-ray fluorescence analysis using CAMAC (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 7 (1978), S. 57-62 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A Siemens SRS X-ray spectrometer, with 10 sample chamber has been interfaced to a PDP11/10 mini-computer through a CAMAC interface. Digital Equipment Corporation's RT11 operating system is used to support the Fortran programs which run the instrument. Advantages of this arrangement are: (1) The CAMAC modular interface philosophy makes simple any hardware re-arrangements and extension to other instrument; (2) High level language programs are easily written for instrument control, data collection and processing; and (3) Simple English language dialogue via an inexpensive television console makes operation possible by all levels of personnel.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300070204
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  • 8
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    Rheomorphism of Granite by Gabbro Intrusions on the Coast of South-Central Labrador (1969)
    University of Chicago Press
    Details
    Publication Date: 1969-03-01
    Print ISSN: 0022-1376
    Electronic ISSN: 1537-5269
    Topics: Geosciences
    Published by University of Chicago Press
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  • 9
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    The application and significance of gold-silver ratios at Val d'Or, Quebec (1967)
    Society of Economic Geologists
    Details
    Publication Date: 1967-06-01
    Print ISSN: 0361-0128
    Electronic ISSN: 1554-0774
    Topics: Geosciences
    Published by Society of Economic Geologists
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  • 10
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    X-ray Emission Microanalysis of Rock-forming Minerals. VIII. Amphiboles (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-10-01
    Print ISSN: 0008-4077
    Electronic ISSN: 1480-3313
    Topics: Geosciences
    Published by Canadian Science Publishing
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