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    Magnetic fields of lunar multi-ring impact basins

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    Author
    Halekas, J. S.
    Lin, R. P.
    Mitchell, D. L.
    Issue Date
    2003-01-01
    Keywords
    magnetic fields
    Moon
    Crustal magnetization
    Lunar Prospector spacecraft
    Impact basin
    
    Metadata
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    Citation
    Halekas, J. S., Lin, R. P., & Mitchell, D. L. (2003). Magnetic fields of lunar multi‐ring impact basins. Meteoritics & Planetary Science, 38(4), 565-578.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655682
    DOI
    10.1111/j.1945-5100.2003.tb00027.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We survey the magnetic fields of lunar multi-ring impact basins using data from the electron reflectometer instrument on the Lunar Prospector spacecraft. As for smaller lunar craters, the primary signature is a magnetic low that extends to ~1.5-2 basin radii, suggesting shock demagnetization of relatively soft crustal magnetization. A secondary signature, as for large terrestrial basins, is the presence of central magnetic anomalies, which may be due to thermal remanence in impact melt rocks and/or shock remanence in the central uplift. The radial extent of the anomalies may argue for the former possibility, but the latter or a combination of the two are also possible. Central anomaly fields are absent for the oldest pre-Nectarian basins, increase to a peak in early Nectarian basins, and decrease to a low level for Imbrian basins. If basin-associated anomalies provide a good indication of ambient magnetic fields when the basins formed, this suggests the existence of a "magnetic era" (possibly due to a lunar core dynamo) similar to that implied by paleointensity results from returned lunar samples. However, the central basin anomalies suggest that the fields peaked in early Nectarian times and were low in Imbrian times, while samples provide evidence for high fields in Nectarian and early Imbrian times.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2003.tb00027.x
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    Meteoritics & Planetary Science, Volume 38, Number 4 (2003)

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