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dc.contributor.authorEngvik, A.
dc.contributor.authorGolla-Schindler, U.
dc.contributor.authorBerndt, J.
dc.contributor.authorAustrheim, H.
dc.contributor.authorPutnis, Andrew
dc.identifier.citationEngvik, A. and Golla-Schindler, U. and Berndt, J. and Austrheim, H. and Putnis, A. 2009. Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism. Lithos. 112 (3-4): pp. 236-246.

The pseudomorphic replacement of chlorapatite by hydroxy-fluor-apatite is associated with metasomatism of the Ødegården metagabbro (Bamble, south Norway). Primary fluor-chlorapatite in the protolith gabbro is non-porous and homogenous in composition with F-content of up to 3.5 wt% and Cl-content up to 2 wt.%. Metasomatism transforms apatite during multi-stage replacement reactions: I) Magmatic apatite was transformed to chlorapatite with Cl-content of up to 6.8 wt.% during scapolitisation. II) A secondary pseudomorphic replacement reaction which transforms chlorapatite to porous hydroxy-fluor-apatite with only minor Cl is related to albitisation. Laser ablation inductively coupled mass spectrometry (LA ICPMS) data from the primary fluor-chlorapatite shows in general a high content of Sr, Y, REE and Th. Chlor- and hydroxy-fluor-apatite show depletion in Co, Ni, Sr, Cd, Pb, Th and U, and enrichment in V and Ba, relative to the primary apatite. The replacement interface of chlorapatite to hydroxy-fluor-apatite is studied by energy-filtered transmission electron microscopy (TEM). The interface is sharp on a nano-scale, and the crystallographic orientation of the apatite is preserved. These observations, together with the porosity development in the hydroxy-fluor-apatite suggest that the replacement mechanism is by interface-coupled dissolution-reprecipitation. © 2009 Elsevier B.V. All rights reserved.

dc.publisherElsevier BV
dc.titleIntragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism
dc.typeJournal Article
curtin.departmentDepartment of Applied Geology
curtin.accessStatusFulltext not available

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