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K-Rich Mordenite from Late Miocene Rhyolitic Tuffs, Island of Samos, Greece

Published online by Cambridge University Press:  02 April 2024

G. Pe-Piper  and
P. Tsolis-Katagas
G. Pe-Piper
Affiliation:
Department of Geology, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
P. Tsolis-Katagas
Affiliation:
Department of Geology, University of Patras, Patras 261 110, Greece
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Abstract

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Mordenite occurs in hydrothermally altered rhyolitic volcanic rocks at the margin of a Late Miocene lake basin on the island of Samos, Greece. The mordenite was identified by its X-ray powder diffraction pattern and appearance in scanning electron micrographs. Electron microprobe analyses show high Si, Ca, and K, low Na, and high balance errors. The b cell dimension is consistent with a high Si/(Al + Si) ratio, and the balance errors are apparently due to Na deficiency. The missing Na was estimated from the amount required to give (Si + Al) = 48 and yielded analyses comparable with X-ray fluorescence analyses of samples predominantly of mordenite. Even after this correction, the mordenite had a low Na:K ratio compared with most analyses reported in the literature. The peculiar chemistry of the mordenite may have resulted from a high-temperature metasomatic origin as a result of basaltic volcanism at the basin margin and characterized by hydrothermal circulation of alkaline lake water rich in K.

Keywords

Hydrothermal alterationMordenitePotassiumRhyolitic tuffVolcanic ashX-ray powder diffractionZeolite
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 3 , June 1991 , pp. 239 - 247
Copyright
Copyright © 1991, The Clay Minerals Society

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