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    Noble gases in Muong Nong-type tektites and their implications

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    Author
    Mizote, S.
    Matsumoto, T.
    Matsuda, J.-I.
    Koeberl, C.
    Issue Date
    2003-01-01
    Keywords
    Tektites
    Muong Nong-type
    noble gases
    impacts
    
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    Citation
    Mizote, S., Matsumoto, T., Matsuda, J.-I., & Koeberl, C. (2003). Noble gases in Muong Nong‐type tektites and their implications. Meteoritics & Planetary Science, 38(5), 747-758.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655694
    DOI
    10.1111/j.1945-5100.2003.tb00039.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We have measured the elemental abundances and isotopic compositions of noble gases in Muong Nong-type tektites from the Australasian strewn field by crushing and by total fusion of the samples. We found that the abundances of the heavy noble gases are significantly enriched in Muong Nong-type tektites compared to those in normal splash-form tektites from the same strewn field. Neon enrichments were also observed in the Muong Nong-type tektites, but the Ne/Ar ratios were lower than those in splash-form tektites because of the higher Ar contents in the former. The absolute concentrations of the heavy noble gases in Muong Nong-type tektites are similar to those in impact glasses. The isotopic ratios of the noble gases in Muong Nong-type tektites are mostly identical to those in air, except for the presence of radiogenic 40Ar. The obtained K-Ar ages for Muong Nong-type tektites were about 0.7 Myr, similar to ages of other Australasian tektites. The crushing experiments suggest that the noble gases in the Muong Nong-type tektites reside mostly in vesicles, although Xe was largely affected by adsorbed atmosphere after crushing. We used the partial pressure of the heavy noble gases in vesicles to estimate the barometric pressure in the vesicles of the Muong Nong-type tektites. Likely, Muong Nong-type tektites solidified at the altitude (between the surface and a maximum height of 8-30 km) lower than that for splash-form tektites.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2003.tb00039.x
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    Meteoritics & Planetary Science, Volume 38, Number 5 (2003)

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