gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1979.043.325.16 Distribution of Fe and Mg Between Garnet and Biotite in Scottish Barrovian Metamorphic Zones Baltatzis E. National University of Athens, Institute of Mineralogy and Petrology, Panepistimiopolis, Ano Ilissia, Athens (621), Greece 3 1979 43 325 155 157 5 9 1978 Copyright © 1979, The Mineralogical Society 1979 Summary

The distribution coefficient KD = (Mg/ Fe)garnet/(Mg/Fe)biotite has been calculated for eight garnet-biotite pairs from rocks ranging from the garnet isograd to the staurolite zone along the Stonehaven coast of NE Scotland. This distribution coefficient depends upon metamorphic temperature and is not dependent upon the Mn and Ca content of garnet. Garnet-biotite geothermometer yields temperatures of about 500, 550, and 575–620°C for the garnet, chloritoid + staurolite, and staurolite zones respectively.