Figure 5. Biotite composition illustrated by the plot Fe/Fe+Mg versus TiO2
content.
1 - biotite-plagioclase gneiss of KSDB, 2 - ATPC granitoids,
3 - Garsjo gneiss, 4 - Varanger gneiss, 5 - Kirkenes gneiss,
6 -
TT granitoids of the Murmansk block of the biotite-plagioclase gneiss
(< 0.2% K2O). I-III - biotite from granulite, amphibolite and
epidote-amphibolite fades, accordingly.