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    Solar wind and other gases in the regoliths of the Pesyanoe parent object and the moon

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    Author
    Mathew, K. J.
    Marti, K.
    Issue Date
    2003-01-01
    Keywords
    Fission Xe
    Regolith processes
    solar wind
    xenon
    
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    Citation
    Mathew, K. J., & Marti, K. (2003). Solar wind and other gases in the regoliths of the Pesyanoe parent object and the moon. Meteoritics & Planetary Science, 38(4), 627-643.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655685
    DOI
    10.1111/j.1945-5100.2003.tb00030.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We report new data from Pesyanoe-90,1 (dark lithology) on the isotopic signature of solar wind (SW) Xe as recorded in this enstatite achondrite which represents a soil-breccia of an asteroidal regolith. The low temperature (less than or equal to 800 degrees C) steps define the Pesyanoe-S xenon component, which is isotopically consistent with SW Xe reported for the lunar regolith. This implies that the SW Xe isotopic signature was the same at two distinct solar system locations and, importantly, also at different times of solar irradiation. Further, we compare the calculated average solar wind "SW-Xe" signature to Chass-S Xe, the indigenous Xe observed in SNC (Mars) meteorites. Again, a close agreement between these compositions is observed, which implies that a mass-dependent differential fractionation of Xe between SW-Xe and Chass-S Xe is <1.5 ppm per amu. We also observe fractionated (Pesyanoe-F) Xe and Ar components in higher temperature steps and we document a fission component due to extinct 244Pu. Interestingly, the Pesyanoe-F Xe component is revealed only at the highest temperatures (>1200 degrees C). The Pesyanoe-F gas reveals Xe isotopic signatures that are consistent with lunar solar energetic particles (SEP) data and may indicate a distinct solar energetic particle radiation as was inferred for the moon. However, we cannot rule out fractionation processes due to parent body processes. We note that ratios 36Ar/38Ar less than or equal to 5 are also consistent with SEP data. Calculated abundances of the fission component correlate well with radiogenic 40Ar concentrations, revealing rather constant 244Pu/K ratios in Pesyanoe, and separates thereof, and indicate that both components were retained. We identify a nitrogen component (delta-15N = 44 ppm) of non-solar origin with an isotopic signature distinct from indigenous N (delta-15N = -33 ppm). While large excesses at 128Xe and 129Xe are observed in the lunar regolith samples, these excesses in Pesyanoe are small. On the other hand, significant 126Xe isotopic excesses, comparable to relative excesses observed in lunar soils and breccias, are prominent in the intermediate temperature steps of Pesyanoe-90,1.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2003.tb00030.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 38, Number 4 (2003)

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