Show simple item record

dc.contributor.authorEngvik, A.
dc.contributor.authorPutnis, Andrew
dc.contributor.authorFitz Gerald, J.
dc.contributor.authorAustrheim, H.
dc.date.accessioned2017-01-30T13:44:52Z
dc.date.available2017-01-30T13:44:52Z
dc.date.created2016-09-12T08:36:35Z
dc.date.issued2008
dc.identifier.citationEngvik, 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.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/34647
dc.identifier.doi10.3749/canmin.46.6.1401
dc.description.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.

dc.publisherMineralogical Association of Canada
dc.titleAlbitization of granitic rocks: The mechanism of replacement of oligoclase by albite
dc.typeJournal Article
dcterms.source.volume46
dcterms.source.number6
dcterms.source.startPage1401
dcterms.source.endPage1415
dcterms.source.issn0008-4476
dcterms.source.titleCanadian Mineralogist
curtin.departmentDepartment of Applied Geology
curtin.accessStatusFulltext not available


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record