What question did this study set out to answer?

This research aims to determine the stability relations of annite by analyzing its phase equilibria concerning temperature and oxygen fugacity.

Stability Relations of the Ferruginous Biotite, Annite

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Randomized trial assesses phase stability of annite under different conditions, suggesting important geological implications.

This research aims to determine the stability relations of annite by analyzing its phase equilibria concerning temperature and oxygen fugacity.
Synthesis of annite and measurement of its optical properties and unit-cell dimensions under controlled conditions.
Analysis of phase stability and decomposition reactions at varying total pressures and oxygen fugacity.
Recalculation of published analyses of natural biotites to evaluate hydrogen content variability.
Annite decomposes into assemblages like hematite+sanidine and magnetite+sanidine at specific fo2-T conditions.
Stability of annite exists between 425°C and 825°C at 2070 bars total pressure, influenced by fo2 levels.
Thermodynamic extrapolations validate the internal consistency of the data, supporting variable oxygen fugacity mechanisms in nature.

EUGSTER et al. (1962) studied this question.

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