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Mineralogical characterization of fibrous zeolites from the Kahrizak volcanic suite, south Tehran, Iran

Published online by Cambridge University Press:  09 July 2018

M. Kusehlar ,
F. Tutti ,
H. Mirnejad  and
A. E. Lalonde
M. Kusehlar
Affiliation:
School of Geology, College of Science, University of Tehran, Tehran, Iran 14155-64155
F. Tutti*
Affiliation:
School of Geology, College of Science, University of Tehran, Tehran, Iran 14155-64155
H. Mirnejad
Affiliation:
School of Geology, College of Science, University of Tehran, Tehran, Iran 14155-64155
A. E. Lalonde
Affiliation:
Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
*
*E-mail: tutti@khayam.ut.ac.ir
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Abstract

Selected samples of large cavity filling and vein-type fibrous zeolites from Eocene volcanic rocks in the Kahrizak region, northern Iran, have been studied for their mineralogical and chemical characteristics. X-ray powder diffraction and electron microprobe analyses confirmed the presence of natrolite, mesolite and scolecite with compositions of [Na14.922Ca0.202K0.015Ba0.002] [Al15.697Si24.267O80]·nH2O, [Ca15.714Na14.224][Al46.431Si73.398O240]·nH2O and [Ca7.804Na0.142K0.024 Ba0.012Mg0.006][Al15.320Si24.437O80]·nH2O, respectively. In addition, examination of textural relationships in thin sections and back-scattered electron images reveals a paragenetic order in which the Ca-rich zeolites crystallized first. It is most probable that the fibrous zeolites of Kahrizak were formed during two pulses of hydrothermal activity in the area. Scolecite and mesolite were precipitated from Ca-rich solution, whereas the second stage Na-rich, low-temperature fluid crystallized natrolite and reacted with Ca-species.

Keywords

mesolitenatrolitescolecitezeoliteKahrizakIran
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 4 , December 2010 , pp. 507 - 517
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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