The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments
Oligoclase and labradorite crystals have been experimentally replaced by albite in an aqueous sodium silicate solution at 600°C and 2 kbars. The replacement is pseudomorphic and is characterised by a sharp chemical interface which progresses through the feldspar while preserving the crystallographic...
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| Format: | Journal Article |
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Springer
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/37309 |
| _version_ | 1848755010873065472 |
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| author | Hövelmann, J. Putnis, Andrew Geisler, T. Schmidt, B. Golla-Schindler, U. |
| author_facet | Hövelmann, J. Putnis, Andrew Geisler, T. Schmidt, B. Golla-Schindler, U. |
| author_sort | Hövelmann, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Oligoclase and labradorite crystals have been experimentally replaced by albite in an aqueous sodium silicate solution at 600°C and 2 kbars. The replacement is pseudomorphic and is characterised by a sharp chemical interface which progresses through the feldspar while preserving the crystallographic orientation. Reaction rims of albite, up to 50 µm thick, can be readily achieved within 14 days. Re-equilibration of plagioclase in an 18O-enriched sodium- and silica-bearing solution results in oxygen isotope redistribution within the feldspar framework structure. The observed characteristics of the reaction products are similar to naturally albitised plagioclase and are indicative of an interface-coupled dissolution- reprecipitation mechanism. Chemical analyses demonstrate that the albitisation is accompanied by the mobilisation of major, minor and trace elements also including elements such as Al and Ti which are commonly regarded as immobile during hydrothermal alteration. The results contribute to developing our understanding of the close association between large-scale albitisation and secondary ore mineralisation which is common in nature. © 2009 Springer-Verlag. |
| first_indexed | 2025-11-14T08:49:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-37309 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:49:31Z |
| publishDate | 2010 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-373092017-09-13T13:38:13Z The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments Hövelmann, J. Putnis, Andrew Geisler, T. Schmidt, B. Golla-Schindler, U. Oligoclase and labradorite crystals have been experimentally replaced by albite in an aqueous sodium silicate solution at 600°C and 2 kbars. The replacement is pseudomorphic and is characterised by a sharp chemical interface which progresses through the feldspar while preserving the crystallographic orientation. Reaction rims of albite, up to 50 µm thick, can be readily achieved within 14 days. Re-equilibration of plagioclase in an 18O-enriched sodium- and silica-bearing solution results in oxygen isotope redistribution within the feldspar framework structure. The observed characteristics of the reaction products are similar to naturally albitised plagioclase and are indicative of an interface-coupled dissolution- reprecipitation mechanism. Chemical analyses demonstrate that the albitisation is accompanied by the mobilisation of major, minor and trace elements also including elements such as Al and Ti which are commonly regarded as immobile during hydrothermal alteration. The results contribute to developing our understanding of the close association between large-scale albitisation and secondary ore mineralisation which is common in nature. © 2009 Springer-Verlag. 2010 Journal Article http://hdl.handle.net/20.500.11937/37309 10.1007/s00410-009-0415-4 Springer restricted |
| spellingShingle | Hövelmann, J. Putnis, Andrew Geisler, T. Schmidt, B. Golla-Schindler, U. The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments |
| title | The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments |
| title_full | The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments |
| title_fullStr | The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments |
| title_full_unstemmed | The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments |
| title_short | The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments |
| title_sort | replacement of plagioclase feldspars by albite: observations from hydrothermal experiments |
| url | http://hdl.handle.net/20.500.11937/37309 |