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    Detection of Crystalline and Fine-grained Calcic Plagioclases on Vesta

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    Authors
    Palomba, E.
    D'Aversa, E.
    Sato, T.M.
    Longobardo, A.
    Dirri, F.
    Aoki, S.
    Orton, G.
    Sindoni, G.
    Oliva, F.
    Carrozzo, G.
    Kasaba, Y.
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    Discipline
    Physical sciences
    Subject
    Infrared astronomy
    Spectroscopy
    Main belt asteroids
    Asteroids
    Minor planets
    Meteorites
    Achondrites
    Infrared telescopes
    Audience
    Scientific
    Date
    2019
    Metadata
    Show full item record
    Description
    Plagioclase feldspars are among the most prevalent minerals in the solar system, and are present in many chondritic and achondritic meteorite families. Nevertheless, spectral features of plagioclases have never been unambiguously and directly observed in remote observations of asteroids. We report here the detection of an absorption band at 12.2 μm on Vesta spectra provided by ground-based spectral observations at the Subaru Telescope. This signature represents the first direct evidence of a widespread presence of crystalline Ca-rich plagioclase on Vesta and reveals that its regolith is comminuted to a very fine grain size, smaller than a few tens of microns, indicating that the mechanical brecciation process has been very effective. The crystalline nature of plagioclase strongly suggests that impacts alone cannot be the sole mechanism for regolith formation on Vesta and a milder process, such as thermal fatigue, should be invoked as an important and concomitant process Thermal fatigue should be considered a very effective process in regolith production and rejuvenation not only for near-Earth asteroids but even for large asteroids located in the main belt.
    Citation
    Palomba, E.; D'Aversa, E.; Sato, T.M.; Longobardo, A.; Dirri, F.; Aoki, S.; Orton, G.; Sindoni, G.; Oliva, F.; Carrozzo, G.; Kasaba, Y. (2019). Detection of Crystalline and Fine-grained Calcic Plagioclases on Vesta. , The Astrophysical Journal Letters, Vol. 882, Issue 2, L22, DOI: 10.3847/2041-8213/ab339e.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7353
    doi: http://dx.doi.org/10.3847/2041-8213/ab339e
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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