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Poly-phase alteration history of the kaolinitized ‘Cava di Caolino’ volcanics (Lipari Island, southern Italy)

Published online by Cambridge University Press:  09 July 2018

S. Decrée ,
A. Bernard ,
J. Yans  and
Th. De Putter
S. Decrée*
Affiliation:
Université Libre de Bruxelles, CP 160-02, Géochimie et Minéralogie, 50 av. F. Roosevelt, B-1050 Brussels
A. Bernard
Affiliation:
Université Libre de Bruxelles, CP 160-02, Géochimie et Minéralogie, 50 av. F. Roosevelt, B-1050 Brussels
J. Yans
Affiliation:
Faculté Polytechnique de Mons, Géologie Fondamentale et Appliquée, 9 rue de Houdain, B-7000 Mons
Th. De Putter
Affiliation:
Musée Royal de l'Afrique Centrale, Géologie Isotopique, 13 Leuvensesteenweg, B-3080 Tervuren, Belgium
*
*E-mail: sdecree@ulb.ac.be
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Abstract

A 65 m thick altered volcanic profile was studied in the Cava di Caolino (Lipari Island) in order to (1) identify the alteration event(s), (2) model these events, and (3) propose estimates of the degree of chemical alteration (CIA, chemical index of alteration). Two mineral parageneses were identified: one comprising silico-aluminous phases, with well crystallized kaolinite (type 1), and the other comprising sulphates, with kaolinite as fracture infilling (type 2). The geochemistry of fluids analysed from a local hot spring (40°C, pH ≈ 8) allowed modelling of the observed silico-aluminous paragenesis. A later fumarolic event is suggested to be responsible for the sulphate paragenesis. The main stage of hydrothermal alteration lasted for ~50 ky, was marked by an increase in the CIA from the protolith (~52) to the alterites (~98), and resulted in the alteration of a 65 m thick series. Such data could be used to predict the alteration of volcanic rocks around underground nuclear waste repositories.

Keywords

Acid fluidsalterationhydrothermal alkaline fluidskaoliniteLipari Islandradioactive waste repositories sulphatesItaly
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 2 , June 2005 , pp. 153 - 165
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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