Journal
JOURNAL OF METAMORPHIC GEOLOGY
Volume 28, Issue 6, Pages 599-613Publisher
WILEY
DOI: 10.1111/j.1525-1314.2010.00880.x
Keywords
corundum plus quartz; ferric iron; oxygen activity; pseudosection; redox budget
Categories
Funding
- National Research Foundation
- ARC [DP0451770, DP0987731]
- Australian Research Council [DP0451770] Funding Source: Australian Research Council
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Ferric iron is present in all metamorphic rocks and has the ability to significantly affect their phase relations. However, the influence of ferric iron has commonly been ignored, or at least not been considered quantitatively, mainly because its abundance in rocks and minerals is not determined by routine analytical techniques. Mineral equilibria calculations that explicitly account for ferric iron can be used to examine its effect on the phase relations in rocks and, in principle, allow the estimation of the oxidation state of rocks. This is illustrated with calculated pseudosections in NCKFMASHTO for mafic and pelitic rock compositions. In addition, it is shown that ferric iron has the capacity to significantly increase the stability of the corundum + quartz assemblage, making it possible for this assemblage to exist at crustal P-T conditions in oxidized rocks of appropriate composition.
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