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Occurrence of Clinoptilolite and Mordenite in Tertiary Calc-Alkaline Pyroclastites from Sardinia (Italy)

Published online by Cambridge University Press:  28 February 2024

Maria R. Ghiara ,
Carmela Petti ,
Enrico Franco ,
Roberto Lonis ,
Santina Luxoro  and
Lucio Gnazzo
Maria R. Ghiara
Affiliation:
Dipartimento di Scienze della Terra, Università Federico II di Napoli, via Mezzocannone 8, 80134 Napoli, Italy
Carmela Petti
Affiliation:
Dipartimento di Scienze della Terra, Università Federico II di Napoli, via Mezzocannone 8, 80134 Napoli, Italy
Enrico Franco
Affiliation:
Dipartimento di Scienze della Terra, Università Federico II di Napoli, via Mezzocannone 8, 80134 Napoli, Italy
Roberto Lonis
Affiliation:
PROGEMISA Società Sarda Valorizzazione Georisorse, Cagliari, Italy
Santina Luxoro
Affiliation:
PROGEMISA Società Sarda Valorizzazione Georisorse, Cagliari, Italy
Lucio Gnazzo
Affiliation:
Dipartimento di Scienze della Terra, Università Federico II di Napoli, via Mezzocannone 8, 80134 Napoli, Italy
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Abstract

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Clinoptilolite and mordenite occur as diagenetic products of medium-grained, moderately welded and poorly sorted pyroclastic flows belonging to the Tertiary calc-alkaline volcanism of Sardinia. Both clinoptilolite and mordenite occur within pyroclastic flows of the same stratigraphic unit. Mordenite frequently occurs in the late volcanic sequences from Anglona area (northern Sardinia). Textural features indicate that zeolites are products of glass alteration. Thin sections show either complete alteration of glassy shards by clinoptilolite and mordenite or unaltered shards with clinoptilolite or mordenite confined to the cineritic matrix. During the zeolitization process, interacting fluids were important in the mobilization and distribution of alkali elements. The compositional variations of clinoptilolite and mordenite within a single sample showed trends that suggest steps in a continuous process probably evolving towards equilibrium conditions.

Keywords

ClinoptiloliteFluid/Rock InteractionMordeniteOpal-CTTertiary Pyroclastic Flows
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 3 , June 1999 , pp. 319 - 328
Copyright
Copyright © 1999, The Clay Minerals Society

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