gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1987.051.362.15 Mineralogy Primary Allanite in Andesitic Rocks from the Poros Volcano, Greece Mitropoulos P. University of Athens, Department of Geology, Panepistimiopolis, Ano Ilisia, Athens 15701, Greece 10 1987 51 62 601 604 24 3 1986 21 7 1986 Copyright © 1987, The Mineralogical Society 1987 Abstract

Primary allanite crystals occurring in andesitic rocks from Poros, NE Peloponnese, Greece were studied. Although the allanite shows high REE content, its presence does not affect the whole-rock REE content of the andesite. It is suggested that the formation of allanite crystals reflects the crystallization history of the andesitic rocks where allanite occurs. These andesitic rocks are the most basic rocks in which allanite has been reported.

 Keywords allanite andesitic rocks rare earth elements Poros Greece