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    Molybdenum isotope variations in molybdenite: vapor transport and Rayleigh fractionation of Mo

    Access Status
    Fulltext not available
    Authors
    Hannah, J.
    Stein, H.
    Wieser, M.
    De Laeter, John
    Varner, M.
    Date
    2007
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hannah, J. and Stein, H. and Wieser, Michael and De Laeter, John and Varner, M. 2007. Molybdenum isotope variations in molybdenite: vapor transport and Rayleigh fractionation of Mo. Geology. 35 (8): pp. 703-706.
    Source Title
    Geology
    DOI
    10.1130/G23538A.1
    ISSN
    00917613
    Faculty
    Department of Medical Imaging and Applied Physics
    School of Science
    Faculty of Science and Engineering
    School
    Department of Imaging and Applied Physics
    Remarks

    Publisher's address is: Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org).

    Copyright © 2007 Geological Society of America

    URI
    http://hdl.handle.net/20.500.11937/19617
    Collection
    • Curtin Research Publications
    Abstract

    Molybdenum isotopes in 20 molybdenite samples, dated by the Re-Os method and representing a range of geologic settings, show mass-dependent fractionation spanning 0.63 per atomic mass unit (amu). Previous Mo isotope data for molybdenite reveal variations in fractionation of <0.5/amu. Interpretation of these data is hampered, however, by limited sample numbers in each study, lack of a common standard for interlaboratory comparison, and limited range of geologic settings. Here we show that Mo isotope compositions of molybdenites do not correlate with crystallization temperature, age, geographic distribution, or geologic conditions. Rather, Rayleigh distillation may explain variations of as much as 0.34/amu in a single molybdenite occurrence, exceeding the proposed variability in average continental crust. Vapor transport and rapid precipitation of Mo in propagating fractures may account for isotope fractionation of Mo (and perhaps other metals) at very small scales. If so, the average isotopic composition of Mo at each molybdenite occurrence may be representative of bulk crust. Our results suggest that the isotopic composition of Mo delivered to the oceans is uniform geographically and through geologic time.

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