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    Earliest rock fabric formed in the Solar System preserved in a chondrule rim

    201711_201711.pdf (721.7Kb)
    Access Status
    Open access
    Authors
    Bland, Phil
    Howard, L.
    Prior, D.
    Wheeler, J.
    Hough, R.
    Dyl, Kathryn
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Bland, P. and Howard, L. and Prior, D. and Wheeler, J. and Hough, R. and Dyl, K. 2011. Earliest rock fabric formed in the Solar System preserved in a chondrule rim. Nature Geoscience. 4 (4): pp. 244-247.
    Source Title
    Nature Geoscience
    DOI
    10.1038/ngeo1120
    ISSN
    1752-0894
    URI
    http://hdl.handle.net/20.500.11937/47767
    Collection
    • Curtin Research Publications
    Abstract

    Rock fabrics – the preferred orientation of grains – provide a window into the history of rock formation, deformation and compaction. Chondritic meteorites are among the oldest materials in the Solar System1 and their fabrics should record a range of processes occurring in the nebula and in asteroids, but due to abundant fine-grained material these samples have largely resisted traditional in situ fabric analysis. Here we use high resolution electron backscatter diffraction to map the orientation of sub-micrometre grains in the Allende CV carbonaceous chondrite: the matrix material that is interstitial to the mm-sized spherical chondrules that give chondrites their name, and fine-grained rims which surround those chondrules. Although Allende matrix exhibits a bulk uniaxial fabric relating to a significant compressive event in the parent asteroid, we find that fine-grained rims preserve a spherically symmetric fabric centred on the chondrule. We define a method that quantitatively relates fabric intensity to net compression, and reconstruct an initial porosity for the rims of 70-80% - a value very close to model estimates for the earliest uncompacted aggregates2,3. We conclude that the chondrule rim textures formed in a nebula setting and may therefore be the first rock fabric to have formed in the Solar System.

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