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    Crumbs from the crust of Vesta: Achondritic cosmic spherules from the South Pole water well

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    Author
    Taylor, Susan
    Herzog, Gregory F.
    Delaney, Jeremy S.
    Issue Date
    2007-01-01
    Keywords
    micrometeorites
    Composition
    HED meteorites
    
    Metadata
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    Citation
    Taylor, S., Herzog, G. F., & Delaney, J. S. (2007). Crumbs from the crust of Vesta: Achondritic cosmic spherules from the South Pole water well. Meteoritics & Planetary Science, 42(2), 223-233.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656242
    DOI
    10.1111/j.1945-5100.2007.tb00229.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Ten glass cosmic spherules (CS) from the South Pole water well collection were analyzed by electron microprobe. Nine of them have Fe/Mn and Fe/Mg ratios in the range typical of chondrites. One of them (SP37-3), along with up to six other previously analyzed CS, have nonchondritic Fe/Mn and Fe/Mg ratios that agree well with values typical of either (basaltic) howardite, eucrite, and diogenite (HED) meteorites or Martian basalts, but not of lunar samples. SP37-3 also contains an anorthite relic grain. Anorthite has not previously been reported in cosmic spherules, but is well known in HED meteorites. The much greater frequency of HEDs among hand-sized meteorites suggests but does not prove that HED precursors are more likely for the nonchondritic spherules.We estimate that HED-like micrometeorites constitute ~0.5 +/- 0.4% of the total population of micrometeorites in the South Pole water well, a fraction that translates to a flux of 1.6 +/- 0.3 x 10^(-8) g HED micrometeorites/m^2-y. The ratio of HED-like objects to carbonaceous objects is about 100 times less in micrometeorites than among hand-size specimens. We infer that the comparative mechanical weakness of carbonaceous precursor materials tends to encourage spherule formation.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2007.tb00229.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 42, Number 2 (2007)

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