Abstract
Biotite and muscovite from rutile-bearing schists (almandine amphibolite facies) near Sudbury, Ontario, both show a linear increase of Ti content with increasing grade (475 to 725°C). In biotite, the increase of molar proportion of Ti from about 0·2 to 0·5 is accompanied by a linear decrease in content of the other main octahedrally-bound cations. The partition coefficient ( D Ti Biotite/ Muscovite ) decreases 37 %.
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