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    An integrated approach to understanding Apollo 16 impact glasses: Chemistry, isotopes, and shape

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    Author
    Delano, J. W.
    Zellner, N. E. B.
    Barra, F.
    Olson, E.
    Swindle, T. D.
    Tibbetts, N. J.
    Whittet, D. C. B.
    Issue Date
    2007-01-01
    Keywords
    Lunar samples
    glasses
    impacts
    Lunar geology
    40/39 Argon ages
    
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    Citation
    Delano, J. W., Zellner, N. E. B., Barra, F., Olson, E., Swindle, T. D., Tibbetts, N. J., & Whittet, D. C. B. (2007). An integrated approach to understanding Apollo 16 impact glasses: Chemistry, isotopes, and shape. Meteoritics & Planetary Science, 42(6), 993-1004.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656285
    DOI
    10.1111/j.1945-5100.2007.tb01146.x
    Additional Links
    https://meteoritical.org/
    Abstract
    The major- and minor-element abundances were determined by electron microprobe in 1039 glasses from regoliths and regolith breccias to define the compositional topology of lunar glasses at the Apollo 16 landing site in the central highlands of the Moon. While impact glasses with chemical compositions similar to local materials (i.e., Apollo 16 rocks and regoliths) are abundant, glasses with exotic compositions (i.e., transported from other areas of the Moon) account for up to ~30% of the population. A higher proportion of compositionally exotic, angular glass fragments exists when compared to compositionally exotic glass spherules. Ratios of non-volatile lithophile elements (i.e., Al, Ti, Mg) have been used to constrain the original source materials of the impact glasses. This approach is immune to the effects of open-system losses of volatile elements (e.g., Si, Na, K). Four impact glasses from one compositionally exotic group (low-Mg high-K Fra Mauro; lmHKFM) were selected for 40Ar/39Ar dating. The individual fragments of lmHKFM glass all yielded ages of ~3750 +/- 50 Ma for the time of the impact event. Based on the petrography of these individual glasses, we conclude that the likely age of the impact event that formed these 4 glasses, as well as the possible time of their ballistic arrival at the Apollo 16 site from a large and distant cratering event (perhaps in the Procellarum KREEP terrain) (Zeigler et al. 2004), is 3730 +/- 40 Ma, close to the accepted age for Imbrium.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2007.tb01146.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 42, Number 6 (2007)

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