Revised activity–composition models for clinopyroxene and amphibole
Abstract
Recent activity–composition models for clinopyroxene and amphibole are revised to provide better consistency with observed phase relations in natural rocks. For clinopyroxene, the calibration in NCFMAS is retained, but the incorporation of acmite is revised to improve the partitioning of ferric iron between coexisting clinopyroxenes. For amphibole, the NCFMASH calibration is retained, but the addition of ferric iron is changed to provide consistency with the clinopyroxenes. The thermodynamics of orthoamphibole (gedrite) is also adjusted to resolve an unrelated inconsistency. The effects of these improvements are illustrated through comparison of calculated pseudosections produced with the existing and new models with natural data from lawsonite eclogites.
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Applying the database, the garnet core composition yielded P-T conditions of 560 °C and 0.79 GPa, similar to the results above.
“Applying this database, the garnet core composition yielded P-T conditions of 560 °C and 0.79 GPa, which is similar to the results above (see Fig. 7B).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Diener and Powell (2012)
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POWELL, R., & HOLLAND, T. J. B. (2008) · Journal of Metamorphic Geology · doi:10.1111/j.1525-1314.2007.00756.x · Cited by 522 · see citing works
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Secular change and the onset of plate tectonics on Earth
Palin, R. M., Santosh, M., Cao, W., Li, S.-S., Hernández-Uribe, D., & Parsons, A. (2020) · Earth-Science Reviews · doi:10.1016/j.earscirev.2020.103172 · Cited by 355 · see citing works
“Recent advances in the capability of petrological modeling to simulate subsolidus and suprasolidus phase equilibria (Diener et al., 2007; Diener and Powell, 2012; Green et al., 2007, 2016; Holland et al., 2018) in metamorphosed mafic igneous precursors (e.”
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Wiemer, D., Schrank, C. E., Murphy, D. T., Wenham, L., & Allen, C. M. (2018) · Nature Geoscience · doi:10.1038/s41561-018-0105-9 · Cited by 124 · see citing works
Duesterhoeft, E., Raase, P., Duguet, M., & Easton, R. M. (2021) · Canadian Journal of Earth Sciences · doi:10.1139/cjes-2019-0238 · Cited by 4 · see citing works
Metamorphic Reactions and Processes
Green, E. C. R. (2018) · Encyclopedia of Earth Sciences Series · doi:10.1007/978-3-319-39193-9_69-1 · Cited by 1 · see citing works
- Authors
- DIENER, J. F. A., & POWELL, R.
- Affiliations
- University of Cape Town (ZA)
- The University of Melbourne (AU)
- Corresponding author
- DIENER, J. F. A.
- Venue
- Journal of Metamorphic Geology
- Publisher
- Wiley
- Published
- 2011-10-13
- Volume
- 30
- Issue
- 2
- Pages
- 131-142
- ISSN
- 0263-4929 (ISSN-L)
- 1525-1314
- OpenAlex
- W1570420886
- Cited by
- 289
- References
- 1
- Citations by year
- 2026: 4 · 2025: 16 · 2024: 13 · 2023: 21 · 2022: 15 · 2021: 27 · 2020: 19 · 2019: 25 · 2018: 34 · 2017: 31 · 2016: 21 · 2015: 20 · 2014: 25 · 2013: 11 · 2012: 7
- FWCI
- 11.70
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Metamorphic Geology (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Engineering › Mechanical Engineering › Metallurgical Processes and Thermodynamics
- Keywords
- clinopyroxene, amphibole, mineral thermodynamics, acmite, gedrite, pseudosections, lawsonite eclogite, phase equilibria
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