期刊
JOURNAL OF METAMORPHIC GEOLOGY
卷 30, 期 2, 页码 131-142出版社
WILEY
DOI: 10.1111/j.1525-1314.2011.00959.x
关键词
amphibole; clinopyroxene; mineral equilibria
类别
资金
- UCT
- ARC [DP0451770, DP0987731]
Recent activitycomposition 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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