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    Generation of amorphous carbon and crystallographic texture during low-temperature subseismic slip in calcite fault gouge

    Access Status
    Fulltext not available
    Authors
    Piane, C.
    Piazolo, S.
    Timms, Nicholas Eric
    Luzin, V.
    Saunders, M.
    Bourdet, J.
    Giwelli, A.
    Ben Clennell, M.
    Kong, C.
    Rickard, William
    Verrall, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Piane, C. and Piazolo, S. and Timms, N.E. and Luzin, V. and Saunders, M. and Bourdet, J. and Giwelli, A. et al. 2018. Generation of amorphous carbon and crystallographic texture during low-temperature subseismic slip in calcite fault gouge. Geology. 46 (2): pp. 163-166.
    Source Title
    Geology
    DOI
    10.1130/G39584.1
    ISSN
    0091-7613
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/68213
    Collection
    • Curtin Research Publications
    Abstract

    Identification of the nano-scale to micro-scale mechanochemical processes occurring during fault slip is of fundamental importance to understand earthquake nucleation and propagation. Here we explore the micromechanical processes occurring during fault nucleation and slip at subseismic rates (∼3 × 10−6 m s–1) in carbonate rocks. We experimentally sheared calcite-rich travertine blocks at simulated upper crustal conditions, producing a nano-grained fault gouge. Strain in the gouge is accommodated by cataclastic comminution of calcite grains and concurrent crystal-plastic deformation through twinning and dislocation glide, producing a crystallographic preferred orientation (CPO). Continued wear of fine-grained gouge particles results in the mechanical decomposition of calcite and production of amorphous carbon. We show that CPO and the production of amorphous carbon, previously attributed to frictional heating and weakening during seismic slip, can be produced at low temperature during stable slip at subseismic rates without slip weakening.

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