gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1985.049.354.09 Potassium Pargasite from Einstödingen, Lützow-Holm Bay, East Antarctica Matsubara S. Department of Geology, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku, Tokyo 160, Japan Motoyoshi Y. Department of Geology and Mineralogy, Faculty of Science, Hokkaido University, Kita-10, Nishi-8, Sapporo 060, Japan 12 1985 49 354 703 707 4 12 1984 20 2 1985 Copyright © 1985, The Mineralogical Society 1985 Abstract

Potassium pargasite containing 3.19 wt. % K2O was found in a skarn from the islet of Einstödingen, Lützow-Holm Bay, East Antarctica, together with some high potassium pargasitic amphiboles. A positive correlation is shown between Fe2+/(Mg+Fe2+) and K/(K + Na(A)) ratios in pargasitic amphiboles suggesting that the increase of Fe2+ serve to stabilize high-K pargasites under the metamorphic conditions of the granulite facies.

 Keywords amphiboles pargasite Einstödingen Antarctica