The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals
The a–x relations recently presented in White et al. (2014, Journal of Metamorphic Geology, 32, 261–286) are extended to include MnO. This provides a set of internally consistent a–x relations for metapelitic rocks in the MnO–Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–TiO2–O2 (MnNCKFMASHTO) system. The mix...
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| Format: | Journal Article |
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Wiley - Blackwell
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/47661 |
| _version_ | 1848757895032733696 |
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| author | White, R. Powell, R. Johnson, Tim |
| author_facet | White, R. Powell, R. Johnson, Tim |
| author_sort | White, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The a–x relations recently presented in White et al. (2014, Journal of Metamorphic Geology, 32, 261–286) are extended to include MnO. This provides a set of internally consistent a–x relations for metapelitic rocks in the MnO–Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–TiO2–O2 (MnNCKFMASHTO) system. The mixing parameters for the Mn-bearing minerals were estimated using the micro-ϕ approach of Powell et al. (2014, Journal of Metamorphic Geology, 32, 245–260). Then the Mn-end-member thermodynamic properties were calibrated using a database of co-existing minerals involving literature data from rocks and from experiments on natural materials. Mn-end-members were calibrated for orthopyroxene, cordierite, staurolite, chloritoid, chlorite, biotite, ilmenite and hematite, assuming known properties for the garnet end-member spessartine. The addition of MnO to phase diagram calculations results in a marked expansion of the stability of garnet-bearing assemblages. At greenschist facies conditions garnet stability is extended down temperature. At amphibolite facies conditions, the garnet-in boundary shifts to lower pressure. While the addition of MnO greatly influences the stability of garnet, it has relatively little effect on the stability of other common metapelitic minerals, with the resultant diagrams being topologically very similar to those calculated without MnO. Furthermore, the addition of MnO in the amounts measured in most metapelites has only a small effect on the mode of garnet, with calculated garnet modes remaining smaller than 1% in the P–T range outside its predicted Mn-free P–T range. |
| first_indexed | 2025-11-14T09:35:21Z |
| format | Journal Article |
| id | curtin-20.500.11937-47661 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:35:21Z |
| publishDate | 2014 |
| publisher | Wiley - Blackwell |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-476612019-02-19T05:35:23Z The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals White, R. Powell, R. Johnson, Tim Mn-end-members THERMOCALC garnet The a–x relations recently presented in White et al. (2014, Journal of Metamorphic Geology, 32, 261–286) are extended to include MnO. This provides a set of internally consistent a–x relations for metapelitic rocks in the MnO–Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–TiO2–O2 (MnNCKFMASHTO) system. The mixing parameters for the Mn-bearing minerals were estimated using the micro-ϕ approach of Powell et al. (2014, Journal of Metamorphic Geology, 32, 245–260). Then the Mn-end-member thermodynamic properties were calibrated using a database of co-existing minerals involving literature data from rocks and from experiments on natural materials. Mn-end-members were calibrated for orthopyroxene, cordierite, staurolite, chloritoid, chlorite, biotite, ilmenite and hematite, assuming known properties for the garnet end-member spessartine. The addition of MnO to phase diagram calculations results in a marked expansion of the stability of garnet-bearing assemblages. At greenschist facies conditions garnet stability is extended down temperature. At amphibolite facies conditions, the garnet-in boundary shifts to lower pressure. While the addition of MnO greatly influences the stability of garnet, it has relatively little effect on the stability of other common metapelitic minerals, with the resultant diagrams being topologically very similar to those calculated without MnO. Furthermore, the addition of MnO in the amounts measured in most metapelites has only a small effect on the mode of garnet, with calculated garnet modes remaining smaller than 1% in the P–T range outside its predicted Mn-free P–T range. 2014 Journal Article http://hdl.handle.net/20.500.11937/47661 10.1111/jmg.12095 Wiley - Blackwell fulltext |
| spellingShingle | Mn-end-members THERMOCALC garnet White, R. Powell, R. Johnson, Tim The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| title | The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| title_full | The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| title_fullStr | The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| title_full_unstemmed | The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| title_short | The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| title_sort | effect of mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals |
| topic | Mn-end-members THERMOCALC garnet |
| url | http://hdl.handle.net/20.500.11937/47661 |