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Zeolites in Pyroclastic Deposits in Southeastern Tenerife (Canary Islands)

Published online by Cambridge University Press:  28 February 2024

J. E. Garcia Hernandez ,
J. S. Notario del Pino ,
M. M. Gonzalez Martin ,
F. Hernan Reguera  and
J. A. Rodriguez Losada
J. E. Garcia Hernandez
Affiliation:
Department of Pedology and Geology, University of La Laguna, 38204 La Laguna, Tenerife, Canary Islands, Spain
J. S. Notario del Pino
Affiliation:
Department of Pedology and Geology, University of La Laguna, 38204 La Laguna, Tenerife, Canary Islands, Spain
M. M. Gonzalez Martin
Affiliation:
Department of Pedology and Geology, University of La Laguna, 38204 La Laguna, Tenerife, Canary Islands, Spain
F. Hernan Reguera
Affiliation:
Department of Pedology and Geology, University of La Laguna, 38204 La Laguna, Tenerife, Canary Islands, Spain
J. A. Rodriguez Losada
Affiliation:
Department of Pedology and Geology, University of La Laguna, 38204 La Laguna, Tenerife, Canary Islands, Spain
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Abstract

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The chemical and the mineralogical composition of a group of pumiceous tuffs associated with recent salic volcanic episodes from Tenerife (Canary Islands) have been studied. The investigation focused on the two main types of pyroclastic deposits of the zone: ash-flows and ash-falls. The samples can be classified chemically as trachytic and phonolitic rocks with an intermediate silica content and a high percentage of alkali cations (Na+ and K+). The mineralogical composition, determined by X-ray diffraction, scanning electron microscopy, and optical microscopy, shows the occurrence of zeolites (mainly phillipsite, with lesser chabazite and analcime), associated with the parent glass. K-feldspar (sanidine) and calcite are accessory minerals. Zeolites are significantly more abundant in the ash-flow deposits. Zeolite formation by hydrothermal weathering in closed-system conditions varies according to the nature and the origin of the pyroclastic deposits. Tenerife phillipsites differ from typical diagenetic, lacustrine, and deep-sea phillipsites, both in chemical and mineralogical features. Alkali cations exceed divalent cations in the unit-cell that, assuming a monoclinic symmetry, has the following parameters: a = 8.46–10.55 Å, b = 14.21–14.40 Å, c = 7.80–8.70 Å, and β = 105°–110°.

Keywords

Ash-fallAsh-flowChemical analysisGeoautoclavePhillipsiteX-ray diffractionZeolitesZeolitization
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 5 , October 1993 , pp. 521 - 526
Copyright
Copyright © 1993, The Clay Minerals Society

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