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    Can the Magmatic Conditions of the Martian Nakhlites be Discerned via Investigation of Clinopyroxene and Olivine Intracrystalline Misorientations?

    94156.pdf (4.149Mb)
    Access Status
    Open access
    Authors
    Griffin, S.
    Daly, L.
    Piazolo, S.
    Forman, Lucy
    Cohen, B.E.
    Lee, M.R.
    Trimby, P.W.
    Baumgartner, R.J.
    Benedix, Gretchen
    Hoefnagels, B.
    Date
    2022
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Griffin, S. and Daly, L. and Piazolo, S. and Forman, L.V. and Cohen, B.E. and Lee, M.R. and Trimby, P.W. et al. 2022. Can the Magmatic Conditions of the Martian Nakhlites be Discerned via Investigation of Clinopyroxene and Olivine Intracrystalline Misorientations? Journal of Geophysical Research: Planets. 127 (6): ARTN e2021JE007082.
    Source Title
    Journal of Geophysical Research: Planets
    DOI
    10.1029/2021JE007082
    ISSN
    2169-9097
    Faculty
    Faculty of Science and Engineering
    Research Excellence
    School
    School of Earth and Planetary Sciences (EPS)
    Research Excellence
    URI
    http://hdl.handle.net/20.500.11937/94372
    Collection
    • Curtin Research Publications
    Abstract

    Deformation is a near ubiquitous process that is observed within nearly all naturally forming rocks. Electron backscatter diffraction (EBSD) is a technique that enables slip-systems (a form of plastic deformation) to be inferred from intracrystalline misorientations at a comparable scale to the representative CPO analysis (≥300 crystals for the nakhlites). Extensive laboratory and studies on naturally occurring samples have identified preferential mantle condition extrinsic parameters for specific slip-system signatures within olivine and clinopyroxene. Intracrystalline misorientation patterns for olivine and augite (high Ca-clinopyroxene) for 16 different Martian nakhlite meteorites (21 sections) were analyzed and assessed against these known parameters. Investigation of high and low deformation regions within the nakhlites revealed a shift in intracrystalline misorientation patterns for 10 of the 21 sections. Interpreted as both shock (high deformations) and emplacement (low deformation) signatures, the observed variations in deformation patterns for the two main regimes of deformation indicate heterogeneous sampling of the nakhlite source crater. Our findings indicate that shock deformation is prevalent throughout the nakhlites, and that great care needs to be taken when interpreting intracrystalline misorientations of crystals within apparent lower deformation regions.

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