Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism
dc.contributor.author | Engvik, A. | |
dc.contributor.author | Golla-Schindler, U. | |
dc.contributor.author | Berndt, J. | |
dc.contributor.author | Austrheim, H. | |
dc.contributor.author | Putnis, Andrew | |
dc.date.accessioned | 2017-01-30T13:46:46Z | |
dc.date.available | 2017-01-30T13:46:46Z | |
dc.date.created | 2016-09-12T08:36:35Z | |
dc.date.issued | 2009 | |
dc.identifier.citation | Engvik, 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. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/34953 | |
dc.identifier.doi | 10.1016/j.lithos.2009.02.005 | |
dc.description.abstract |
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.publisher | Elsevier BV | |
dc.title | Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism | |
dc.type | Journal Article | |
dcterms.source.volume | 112 | |
dcterms.source.number | 3-4 | |
dcterms.source.startPage | 236 | |
dcterms.source.endPage | 246 | |
dcterms.source.issn | 0024-4937 | |
dcterms.source.title | Lithos | |
curtin.department | Department of Applied Geology | |
curtin.accessStatus | Fulltext not available |
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