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    Formation of uranium-thorium-rich bitumen nodules in the Lockne impact structure, Sweden: A mechanism for carbon concentration at impact sites

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    Author
    Lindgren, P.
    Parnell, J.
    Norman, C.
    Mark, D. F.
    Baron, M.
    Ormö, J.
    Sturkell, E.
    Conliffe, J.
    Fraser, W.
    Issue Date
    2007-01-01
    Keywords
    irradiation
    carbon
    Lockne impact crater
    
    Metadata
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    Citation
    Lindgren, P., Parnell, J., Norman, C., Mark, D. F., Baron, M., Ormö, J., ... & Fraser, W. (2007). Formation of uranium‐thorium‐rich bitumen nodules in the Lockne impact structure, Sweden: A mechanism for carbon concentration at impact sites. Meteoritics & Planetary Science, 42(11), 1961-1969.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    Description
    From the proceedings of the Workshop on Impact Craters as Indicators for Planetary Environmental Evolution and Astrobiology held in June 2006 in Östersund, Sweden.
    URI
    http://hdl.handle.net/10150/656359
    DOI
    10.1111/j.1945-5100.2007.tb00553.x
    Additional Links
    https://meteoritical.org/
    Abstract
    The Ordovician Lockne impact structure is located in central Sweden. The target lithology consisted of limestone and black unconsolidated shale overlaying a Precambrian crystalline basement. The Precambrian basement is uranium-rich, and the black shale is both uranium- and organic-rich. This circumstance makes Lockne a good candidate for testing the occurrence of U-Thrich bitumen nodules in an impact structure setting. U-Th-rich bitumen nodules are formed through irradiation; hence the increase in the complexity of organic matter by a radioactive (uranium- and thorium-rich) mineral phase. U-Th-rich bitumen nodules were detected in crystalline impact breccia and resurge deposits from the impact structure, but samples of non-impact-affected rocks from outside the impact structure do not contain any U-Th-rich bitumen nodules. This implies that in the Lockne impact structure, the nodules are associated with impact-related processes. U-Th-rich bitumen nodules occur throughout the geological record and are not restricted to an impact structure setting, but our studies at Lockne show that this process of irradiation can readily occur in impact structures where fracturing of rocks and a post-impact hydrothermal system enhances fluid circulation. The irradiation of organic matter by radioactive minerals has previously been proposed as a process for concentration of carbon on the early Earth. Impact structures are suggested as sites for prebiotic chemistry and primitive evolution, and irradiation by radioactive minerals could be an important mechanism for carbon concentration at impact sites.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2007.tb00553.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 42, Number 11 (2007)

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