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    Albitization of granitic rocks: The mechanism of replacement of oligoclase by albite

    Access Status
    Fulltext not available
    Authors
    Engvik, A.
    Putnis, Andrew
    Fitz Gerald, J.
    Austrheim, H.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Engvik, A. and Putnis, A. and Fitz Gerald, J. and Austrheim, H. 2008. Albitization of granitic rocks: The mechanism of replacement of oligoclase by albite. Canadian Mineralogist. 46 (6): pp. 1401-1415.
    Source Title
    Canadian Mineralogist
    DOI
    10.3749/canmin.46.6.1401
    ISSN
    0008-4476
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/34647
    Collection
    • Curtin Research Publications
    Abstract

    Large-scale metasomatic albitization in the albitite terranes of the Bamble sector of southeastern Norway has affected both mafic and granitic lithologies. In partially metasomatized tonalite, the albitization fronts advance normal to fractures and can be recognized in the field by a distinct reddening of the rock in which original plagioclase crystals are replaced by albite. To determine the mechanism of albitization within single crystals of Ca-bearing plagioclase (oligoclase: An21-23), intragranular replacement interfaces have been studied by electron-probe micro-analysis, scanning (SEM) and transmission electron microscopy (TEM). The albite replacement-product (An2-5) has micrometric pores observable by SEM, as well as nanopores imaged by TEM. The albite contains fine-grained white mica commonly associated with the pores, as well as precipitates of hematite. The interface between oligoclase and albite is sharp, with corresponding compositional gradients across no more than tens of nanometers, and the crystallographic orientations of oligoclase and albite are coincident within less than a degree. These are all characteristic features of an interface-coupled dissolution-reprecipitation mechanism of replacement which, in combination with fracturing, is responsible for the fluid infiltration and the mineral-replacement process.

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