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    Mineralogy and petrology of melt rocks from the Popigai impact structure, Siberia

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    Author
    Whitehead, J.
    Grieve, R. A. F.
    Spray, J. G.
    Issue Date
    2002-01-01
    Keywords
    Popigai
    impact structures
    Siberia
    impact melt
    impact breccias
    clasts
    
    Metadata
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    Citation
    Whitehead, J., Grieve, R. A. F., & Spray, J. G. (2002). Mineralogy and petrology of melt rocks from the Popigai impact structure, Siberia. Meteoritics & Planetary Science, 37(5), 623-647.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655512
    DOI
    10.1111/j.1945-5100.2002.tb00844.x
    Additional Links
    https://meteoritical.org/
    Abstract
    The late Eocene Popigai impact structure of Siberia comprises an approximately 0.5-1.5 km thick, ~100 km diameter sequence of clast-rich and clast-poor andesitic to rhyolitic impact melt rocks and impact breccias, underlain by Archean to Proterozoic crystalline basement and Proterozoic to Phanerozoic sedimentary rocks. The fine-grained to cryptocrystalline texture of the more melt-rich rocks, despite their occurrence in bodies locally in excess of 800 m thick and 28 km long, suggests that the melt crystallized in response to: (1) cooling by the clast load, and/or; (2) rapid nucleation on finely brecciated clasts, which have since been assimilated and/or; (3) crystallization enhanced by the relatively low water contents of the melts. Rapid crystallisation of the melt is indicated by the lack of zoning in minerals, the presence of glass, the lack of strain recovery features in clasts and the lack of evidence for fractionation in the major and trace elements, including the rare-earth elements. Optical and analytical electron microscopy reveal that the previously reported division of the melt rocks into high- and low-temperature variants based on hand sample appearance, or glass content, is not warranted. Clasts within the melt-rich rocks exhibit a wide range of shock metamorphic features, though they are not distributed in the impact melts in a systematic manner. This indicates that the melt-rich rocks were well mixed during their formation, thus juxtaposing unshocked with shocked material. Injection of mesostasis melt into partially melted checkerboard plagioclase and orthopyroxene clasts also occurred during this mixing stage.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2002.tb00844.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 37, Number 5 (2002)

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