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    Magnetic characteristics of CV chondrules with paleointensity implications

    186347_63332_68441.pdf (1.091Mb)
    Access Status
    Open access
    Authors
    Emmerton, S.
    Muxworthy, A.
    Hezel, D.
    Bland, Philip
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Emmerton, Stacey and Muxworthy, Adrian and Hezel, Dominik and Bland, Philip. 2011. Magnetic characteristics of CV chondrules with paleointensity implications. Journal of Geophysical Research.116. (12): pp. E12007:1-E12007:13.
    Source Title
    Journal of Geophysical Research E: Planets
    DOI
    10.1029/2011JE003856
    ISSN
    0148-0227
    Remarks

    Copyright © 2011 The American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/34509
    Collection
    • Curtin Research Publications
    Abstract

    We have conducted a detailed magnetic study on 45 chondrules from two carbonaceous chondrites of the CV type: (1) Mokoia and (2) Allende. Allende has been previously extensively studied and is thought to have a high potential of retaining an extra-terrestrial paleofield. Few paleomagnetic studies of Mokoia have previously been undertaken. We report a range of magnetic measurements including hysteresis, first-order reversal curve analysis (FORCs), demagnetization characteristics, and isothermal remanent (IRM) acquisition behavior on both Mokoia and Allende chondrules. The Mokoia chondrules displayed more single domain-like behavior than the Allende chondrules, suggesting smaller grain sizes and higher magnetic stability. The Mokoia chondrules also had higher average concentrations of magnetic minerals and a larger range of magnetic characteristics than the Allende chondrules. IRM acquisition analysis found that both sets of chondrules have the same dominant magnetic mineral, likely to be a FeNi phase (taenite, kamacite, and/or awaruite) contributing to 48% of the Mokoia chondrules and 42% of the Allende chondrule characteristics. FORC analysis revealed that generally the Allende chondrules displayed low-field coercivity distributions with little interactions, and the Mokoia chondrules show clear single-domain like distributions. Paleointensity estimates for the two meteorites using the REMc and Preisach methods yielded estimates between 13 and 60 μT and 3–56 μT, respectively, for Allende and 3–140 μT and 1–110 μT, respectively, for Mokoia. From the data, we suggest that Mokoia chondrules carry a non-primary remagnetization, and while Allende is more likely than Mokoia to retain its primary magnetization, it also displays signs of post accretionary magnetization.

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