Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism
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...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier BV
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/34953 |
| _version_ | 1848754363694055424 |
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| author | Engvik, A. Golla-Schindler, U. Berndt, J. Austrheim, H. Putnis, Andrew |
| author_facet | Engvik, A. Golla-Schindler, U. Berndt, J. Austrheim, H. Putnis, Andrew |
| author_sort | Engvik, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T08:39:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-34953 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:39:13Z |
| publishDate | 2009 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-349532017-09-13T15:28:49Z Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism Engvik, A. Golla-Schindler, U. Berndt, J. Austrheim, H. Putnis, Andrew 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. 2009 Journal Article http://hdl.handle.net/20.500.11937/34953 10.1016/j.lithos.2009.02.005 Elsevier BV restricted |
| spellingShingle | Engvik, A. Golla-Schindler, U. Berndt, J. Austrheim, H. Putnis, Andrew Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| title | Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| title_full | Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| title_fullStr | Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| title_full_unstemmed | Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| title_short | Intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| title_sort | intragranular replacement of chlorapatite by hydroxy-fluor-apatite during metasomatism |
| url | http://hdl.handle.net/20.500.11937/34953 |