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Absect r Biotite in some biotite grade pelitic rocks from north-east Antrim, Ireland, is concentrated along S2 cleavage zones and is absent, or present only in small amounts, in areas between the cleavage zones. Thus, the SA2 cleavage zones form biotite-rich domains, while the intervening areas form bionte-poor domains in the rocks. I t is shown that the various models proposed to explain metamorphic differentiation, involving passive concentration of more dense, less soluble phases by solution and selective removal of more soluble phases, cannot be used to accountfor tkdifferentiated feature observed in the studied rocks. T o explain the segregation and the mechanism of metamorphic differentiation, i t is suggested that biotite had preferentially nucleated and grown in the S cleavage zones. 2

Metamorphic differentiation in some biotite schists from north-east Antrim, Ireland