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    Reaction induced fracturing during replacement processes

    Access Status
    Fulltext not available
    Authors
    Jamtveit, B.
    Putnis, Christine
    Malthe-Sørenssen, A.
    Date
    2009
    Type
    Journal Article
    
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    Citation
    Jamtveit, B. and Putnis, C. and Malthe-Sørenssen, A. 2009. Reaction induced fracturing during replacement processes. Contributions to Mineralogy and Petrology. 157 (1): pp. 127-133.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-008-0324-y
    ISSN
    0010-7999
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/15071
    Collection
    • Curtin Research Publications
    Abstract

    Replacement processes are common transformation mechanisms in minerals and rocks at a variety of conditions and scales. The underlying mechanisms are, in general, poorly understood, but both mechanical and chemical processes are thought to be important. Replacement of leucite (KAlSi2O6) by analcime (NaAlSi2 O6·H2O) is common in silica-poor igneous rocks. A 10% increase in volume is associated with the replacement process, and this generates stresses that eventually cause fracturing of the reacting leucite. Experimentally reacted leucite samples display characteristic fracturing patterns that include both spalling of concentric 'onion-skin'-like layers near the reacting interface and the formation of cross-cutting, often hierarchically arranged, sets of fractures that divide the remaining leucite into progressively smaller domains. These structures may explain the 'patchy' alteration patterns observed in natural leucite samples and similar, so-called, mesh-textures associated with the serpentinization of olivine grains during hydration of mafic or ultramafic rocks. They are also strikingly similar to larger scale patterns formed during spheroidal weathering processes. A simple discrete element model illustrates the mechanics that control the formation of such systems, and shows how these replacement processes may be accelerated due to the generation of new reactive surface area by hierarchical fracturing processes. © Springer-Verlag 2008.

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