Application of the Muscovite-paragonite Geothermometer to a Staurolite-grade Schist from Sulitjelma, North Norway

K. J. Henley1
Department of Geology, University College, Gower Street, London, W.C. 1
1Present address: The Australian Mineral Development Laboratories, Conyngham St., Frewville, South Australia 5063.

Summary: The occurrence of coexisting paragonite (containing 0·70 % CaO) and muscovite (containing 0·16 % CaO) in a staurolite-grade paragonite-muscovite-hornblende-garnet-biotite schist from Sulitjelma enables an estimate to be made of the temperature of recrystallization, using an extension, based on crystal chemistry considerations and available analyses of muscovites and paragonites from metamorphic rocks, of the experimentally determined solvus in the K-Na white mica system into the Ca-K-Na system. This temperature of recrystallization is approximately 550–70 °C and is consistent with the experimental data on the coexistence of staurolite and quartz in the system Fe-A1-Si-O-H (Richardson, 1968).

Mineralogical Magazine; June 1970 v. 37; no. 290; p. 693-704; DOI: 10.1180/minmag.1970.037.290.07
© 1970, The Mineralogical Society
Mineralogical Society (