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    High-precision 40Ar/39Ar age of the Jänisjärvi impact structure (Russia)

    Access Status
    Fulltext not available
    Authors
    Jourdan, Fred
    Renne, P.
    Reimold, U.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Jourdan, Fred and Renne, Paul and Reimold, Uwe. 2008. High-precision 40Ar/39Ar age of the Jänisjärvi impact structure (Russia). Earth and Planetary Science Letters. 265 (3-4): pp. 438-449.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2007.10.043
    ISSN
    0012821X
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    The Western Australian School of Mines
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/503328/description#description

    Copyright © 2008 Elsevier Ltd. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/5264
    Collection
    • Curtin Research Publications
    Abstract

    The ~14 km diameter Jnisjrvi impact structure is located in Svecofennian Proterozoic terrain in the southeastern part of the Baltic shield, Karelia, Russia. Previous radioisotopic dating attempts gave K/Ar and 40Ar/39Ar ages of 700 ± 5 Ma and 698 ± 22 Ma, respectively, with both results being difficult to interpret. Recent paleomagnetic results have challenged these ages and proposed instead ages of either 500 Ma or 850-900 Ma. In order to better constrain the age of the Jnisjrvi impact structure, we present new 40Ar/39Ar data for the Jnisjrvi impact melt rock. We obtained five concordant isochron ages that yield a combined isochron age of 682 ± 4 Ma (2s) with a MSWD of 1.2, P=0.14, and 40Ar/36Ar intercept of 475 ± 3. We suggest that this date indicates the age of the impact and therefore can be used in conjunction with existing paleomagnetic results to define the position of the Baltica paleocontinent at that time. Argon isotopic results imply that melt homogenization was achieved at the hundred-micrometer scale certainly, because of the low-silica content of the molten target rock that allows fast 40Ar* diffusion in the melt. However, the large range of F(40Ar* inherited) (4.1% to 11.0%) observed for seven grains shows that complete isotopic homogenization was not reached at the centimeter and perhaps the millimeter scale. The F(40Ar*inherited) results are also in good agreement with previous Rb and Sr isotopic data.

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