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The decomposition of the iron mica, annite, to sanidine plus magnetite and vapor, KFe 3 AlSi 3 O 10 (OH) 2  = KAlSi 3 O 8  + Fe 3 O 4  + H 2 , has been reexamined experimentally with the use of a variety of bufferscoupledwith f H2  sensorsat 2 kbar and between 400 and 840 °C. Various capsule configurations were used in this study to delineate the equilibrium constant for this reaction in conjunction with  57 Fe Mössbauer spectroscopy measurements to monitor the oxy-annite component in mica in selected experiments. Results at the most reducing and highest temperature conditions of this study extend the annite stability field to higher temperature and fa, values than those defined in previous work. Lower temperature results indicate that the annite-sanidine-magnetite stability boundary does not intersect the hematite + magnetite + H 2 O buffer at 400 °C as previously reported but rather is subparallel to the buffer curve at lower f H2  values. The equilibrium f H2  (in bars) for the assemblage annite + sanidine + magnetite + vapor at 2 kbar and between 400 and 840 °C can be described by the relation log f H2  (± 0.08) = 13.644 - (17368/T) + (5.168 x 10 6 )/T 2 , where T is temperature in kelvins.

Reinvestigation of the annite = sanidine + magnetite + H 2 reaction using the f H₂ -sensor technique