Dear friends,
Thanks a lot for the references on the staurolite-andalucite-garnet-biotite
bearing rocks. In all the occurrences, muscovite is present. Interestingly,
in my rock muscovite is practically absent and the textural features(bt
occurs as inclusions in all other porphyroblasts) show early stability of
biotite. I am therefore, thinking some kind of hydrolysis reaction(s) in an
open system to convert biotite to the other non potassic phases! Your
suggestion in this regard will be highly appreciated.
Thanks to you all!
Pulak
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