Hydrothermal fluorine buffer techniques are used to measure the equilibrium constant for the exchange reaction: OH-muscovite + HF ⇌ F-muscovite + H2O. At a total pressure of two kbar, log K = 2100/T - 0.11(T in kelvins). These data, when combined with similar data for biotite, permit evaluation of F ⇌ OH equilibrium between coexisting biotite and muscovite. The partitioning, which is independent of temperature and fluid composition, may be portrayed graphically, and provides a simple test of F ⇌ OH exchange equilibria in natural mica pairs.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.