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    Collisional history of asteroid Itokawa

    Access Status
    Fulltext not available
    Authors
    Jourdan, Fred
    Timms, Nicholas Eric
    Eroglu, Ela
    Mayers, C.
    Frew, A.
    Bland, Phil
    Collins, G.
    Davison, T.
    Abe, M.
    Yada, T.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Jourdan, F. and Timms, N.E. and Eroglu, E. and Mayers, C. and Frew, A. and Bland, P. and Collins, G. et al. 2017. Collisional history of asteroid Itokawa. Geology. 45 (9): pp. 819-822.
    Source Title
    Geology
    DOI
    10.1130/G39138.1
    ISSN
    0091-7613
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/56741
    Collection
    • Curtin Research Publications
    Abstract

    In situ extraterrestrial samples returned for study (e.g., from the Moon) are crucial in understanding the origin and evolution of the Solar System as, contrary to meteorites, they provide a known geological context for the samples and their analyses. Asteroid 25143 Itokawa is a rubble-pile asteroid consisting of reaccumulated fragments from a catastrophically disrupted monolithic parent asteroid, and from which regolith dust particles have been recovered by the Hayabusa space probe (Japan Aerospace Exploration Agency). We analyzed two dust particles using electron backscatter diffraction and 40 Ar/ 39 Ar dating techniques. One of the grains, showing signs of 15-25 GPa impact shock pressure, yielded a 40 Ar/ 39 Ar plateau age of 2.3 ± 0.1 Ga. We developed a novel temperature-pressure-porosity model, coupled with diffusion models to show that the relatively low pressure and high temperature involved in the impact process can be reconciled only if the asteroid was already made of porous material at ca. 2.3 Ga and, thus, if asteroid Itokawa was already formed, thereby providing a minimum age for catastrophic asteroid breakup. A second particle shows no sign of deformation, indicating shock pressure of < 10 GPa and a calculated maximum temperature of ~200 °C. This low temperature estimate is compatible with a lack of isotopic resetting for this particle. This suggests that the breakup of Itokawa's parent was a relatively low-temperature process at the scale of the asteroid, and occurred on a pre-shattered parent body.

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