Potassium Pargasite from Einstödingen, Lützow-Holm Bay, East Antarctica

S. Matsubara and Y. Motoyoshi
Department of Geology, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku, Tokyo 160, Japan
Department of Geology and Mineralogy, Faculty of Science, Hokkaido University, Kita-10, Nishi-8, Sapporo 060, Japan

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

Mineralogical Magazine; December 1985 v. 49; no. 354; p. 703-707; DOI: 10.1180/minmag.1985.049.354.09
© 1985, The Mineralogical Society
Mineralogical Society (www.minersoc.org)