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Clay Minerals; June 2005; v. 40; no. 2; p. 153-165; DOI: 10.1180/0009855054020162
© 2005 Mineralogical Society of Great Britain and Ireland
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Poly-phase alteration history of the kaolinitized ‘Cava di Caolino’ volcanics (Lipari Island, southern Italy)

S. DECRÉE1,*, A. BERNARD1, J. YANS2 and TH. DE PUTTER3

1 Université Libre de Bruxelles, CP 160-02, Géochimie etMinéralogie, 50 av. F. Roosevelt, B-1050 Brussels, 2 Faculté Polytechnique deMons, Géologie Fondamentale et Appliquée, 9 rue de Houdain, B-7000 Mons, and 3 Musée Royal de l’Afrique Centrale, Géologie Isotopique, 13 Leuvensesteenweg, B-3080 Tervuren, Belgium

* E-mail: sdecree{at}ulb.ac.be

(Received 20 June 2003; revised 20 August 2004)

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 {approx} 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 fluids, alteration, hydrothermal alkaline fluids, kaolinite, Lipari Island, radioactive waste repositories sulphates, Italy






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