Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Mesoscale modeling of impact compaction of primitive solar system solids

    240188.pdf (5.293Mb)
    Access Status
    Open access
    Authors
    Davison, T.
    Collins, G.
    Bland, Phil
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Davison, T. and Collins, G. and Bland, P. 2016. Mesoscale modeling of impact compaction of primitive solar system solids. Astrophysical Journal. 821 (1): 68.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/0004-637X/821/1/68
    ISSN
    0004-637X
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/30882
    Collection
    • Curtin Research Publications
    Abstract

    We have developed a method for simulating the mesoscale compaction of early solar system solids in low-velocity impact events using the iSALE shock physics code. Chondrules are represented by non-porous disks, placed within a porous matrix. By simulating impacts into bimodal mixtures over a wide range of parameter space (including the chondrule-to-matrix ratio, the matrix porosity and composition, and the impact velocity), we have shown how each of these parameters influences the shock processing of heterogeneous materials. The temperature after shock processing shows a strong dichotomy: matrix temperatures are elevated much higher than the chondrules, which remain largely cold. Chondrules can protect some matrix from shock compaction, with shadow regions in the lee side of chondrules exhibiting higher porosity that elsewhere in the matrix. Using the results from this mesoscale modeling, we show how the ? - a porous-compaction model parameters depend on initial bulk porosity. We also show that the timescale for the temperature dichotomy to equilibrate is highly dependent on the porosity of the matrix after the shock, and will be on the order of seconds for matrix porosities of less than 0.1, and on the order of tens to hundreds of seconds for matrix porosities of ~0.3-0.5. Finally, we have shown that the composition of the post-shock material is able to match the bulk porosity and chondrule-to-matrix ratios of meteorite groups such as carbonaceous chondrites and unequilibrated ordinary chondrites.

    Related items

    Showing items related by title, author, creator and subject.

    • Impact-induced compaction of primitive solar system solids: The need for mesoscale modelling and experiments
      Davison, T.; Derrick, J.; Collins, G.; Bland, Phil; Rutherford, M.; Chapman, D.; Eakins, D. (2017)
      Primitive solar system solids were accreted as highly porous bimodal mixtures of mm-sized chondrules and sub-µm matrix grains. To understand the compaction and lithification of these materials by shock, it is necessary ...
    • Investigating shock processes in bimodal powder compaction through modelling and experiment at the mesoscale
      Derrick, J.; Rutherford, M.; Chapman, D.; Davison, T.; Duarte, J.; Farbaniec, L.; Bland, Phil; Eakins, D.; Collins, G. (2019)
      Impact-driven compaction is a proposed mechanism for the lithification of primordial bimodal granular mixtures from which many meteorites derive. We present a numerical-experimental mesoscale study that investigates the ...
    • Evidence for an impact-induced magnetic fabric in Allende, and exogenous alternatives to the core dynamo theory for Allende magnetization
      Muxworthy, A.; Bland, Phil; Davison, T.; Moore, J.; Collins, G.; Ciesla, F. (2017)
      © 2017 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals, Inc. on behalf of The Meteoritical Society. We conducted a paleomagnetic study of the matrix of Allende CV3 chondritic meteorite, ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.