A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia
Transitions from pyrrhotite-magnetite- to pyrite-magnetite- and pyrite-hematite-bearing assemblages in metasedimentary rocks in the Kambalda-St Ives goldfield have been shown to be spatially associated with economic gold grades. Fluid mixing, fluid-rock interaction and phase separation have been pr...
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| Format: | Journal Article |
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Springer
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/36597 |
| _version_ | 1848754814938251264 |
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| author | Evans, Katy |
| author_facet | Evans, Katy |
| author_sort | Evans, Katy |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Transitions from pyrrhotite-magnetite- to pyrite-magnetite- and pyrite-hematite-bearing assemblages in metasedimentary rocks in the Kambalda-St Ives goldfield have been shown to be spatially associated with economic gold grades. Fluid mixing, fluid-rock interaction and phase separation have been proposed previously as causes for this association. Textural, mineralogical and isotopic evidence is reviewed, and thermodynamic calculations are used to investigate the mineralogical consequences of progressive fluid-rock interaction in interflow metasediments. Fluid-rock interactions in response to fluid infiltration and/or bulk composition variation are plausible mechanisms for production of the observed features. |
| first_indexed | 2025-11-14T08:46:24Z |
| format | Journal Article |
| id | curtin-20.500.11937-36597 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:46:24Z |
| publishDate | 2009 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-365972017-09-13T15:53:16Z A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia Evans, Katy fluid pyrite gold pyrrhotite St Ives magnetite Transitions from pyrrhotite-magnetite- to pyrite-magnetite- and pyrite-hematite-bearing assemblages in metasedimentary rocks in the Kambalda-St Ives goldfield have been shown to be spatially associated with economic gold grades. Fluid mixing, fluid-rock interaction and phase separation have been proposed previously as causes for this association. Textural, mineralogical and isotopic evidence is reviewed, and thermodynamic calculations are used to investigate the mineralogical consequences of progressive fluid-rock interaction in interflow metasediments. Fluid-rock interactions in response to fluid infiltration and/or bulk composition variation are plausible mechanisms for production of the observed features. 2009 Journal Article http://hdl.handle.net/20.500.11937/36597 10.1007/s00126-009-0260-4 Springer fulltext |
| spellingShingle | fluid pyrite gold pyrrhotite St Ives magnetite Evans, Katy A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia |
| title | A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia |
| title_full | A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia |
| title_fullStr | A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia |
| title_full_unstemmed | A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia |
| title_short | A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia |
| title_sort | test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the kambalda-st. ives goldfield, western australia |
| topic | fluid pyrite gold pyrrhotite St Ives magnetite |
| url | http://hdl.handle.net/20.500.11937/36597 |