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    Geochemistry and 40Ar-39Ar geochronology of impact-melt clasts in feldspathic lunar meteorites: Implications for lunar bombardment history

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    Author
    Cohen, B. A.
    Swindle, T. D.
    Kring, D. A.
    Issue Date
    2005-01-01
    Keywords
    40Ar-39Ar ages
    Queen Alexandra Range (QUE) 93069
    Dar al Gani
    
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    Citation
    Cohen, B. A., Swindle, T. D., & Kring, D. A. (2005). Geochemistry and 40Ar‐39Ar geochronology of impact‐melt clasts in feldspathic lunar meteorites: Implications for lunar bombardment history. Meteoritics & Planetary Science, 40(5), 755-777.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656001
    DOI
    10.1111/j.1945-5100.2005.tb00978.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We studied 42 impact-melt clasts from lunar feldspathic regolith breccias MacAlpine Hills (MAC) 88105, Queen Alexandra Range (QUE) 93069, Dar al Gani (DaG) 262, and DaG 400 for texture, chemical composition, and/or chronology. Although the textures are similar to the impactmelt clasts identified in mafic Apollo and Luna samples, the meteorite clasts are chemically distinct from them, having lower Fe, Ti, K, and P, thus representing previously unsampled impacts. The 40Ar- 39Ar ages on 31 of the impact melts, the first ages on impact-melt samples from outside the region of the Apollo and Luna sampling sites, range from ~4 to ~2.5 Ga. We interpret these samples to have been created in at least six, and possibly nine or more, different impact events. One inferred impact event may be consistent with the Apollo impact-melt rock age cluster at 3.9 Ga, but the meteorite impact-melt clasts with this age are different in chemistry from the Apollo samples, suggesting that the mechanism responsible for the 3.9 Ga peak in lunar impact-melt clast ages is a lunar-wide phenomenon. No meteorite impact melts have ages more than 1 older than 4.0 Ga. This observation is consistent with, but does not require, a lunar cataclysm.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2005.tb00978.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 40, Number 5 (2005)

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