Mineralogy, geochemistry and genesis of zeolites in cenozoic pyroclastic flows from the Asuni Area (Central Sardinia)

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Marco E. Ciriotti
Messaggi: 26570
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Mineralogy, geochemistry and genesis of zeolites in cenozoic pyroclastic flows from the Asuni Area (Central Sardinia)

Messaggio da Marco E. Ciriotti » mar 17 mar, 2020 10:56

Referenza:
▪ Mormone, A. & Piochi, M. (2020): Mineralogy, Geochemistry and Genesis of Zeolites in Cenozoic Pyroclastic Flows from the Asuni Area (Central Sardinia, Italy). Minerals, 10, 268; https://doi.org/10.3390/min10030268

Abstract:
Natural zeolite occurrences have been recognized in several Cenozoic pyroclastic deposits in central Sardinia. This study concerns the mineralogical and geochemical characterization of the zeolitized tuffites in the Asuni area (Oristano province) and aims to complement information regarding the zeolitization processes developed in the nearby Allai deposits. Optical and scanning electron microscopy, X-ray powder diffraction, qualitative vs. quantitative microanalyses and bulk-rock geochemistry were performed. Analytical results allow defining the mineral distribution, textural relationships and geochemical features of the zeolite-bearing rocks. The most abundant secondary minerals are Ca-Na mordenites. Contrarily to the most common worldwide clinoptilolite + mordenite paragenesis, mordenite is dominant and occurs in different morphologies, rarely coexisting with clinoptilolite in the studied volcanic tuffites. Glauconite and dioctahedral smectite complete the authigenic assemblages. The primary volcanic components mostly include plagioclase, quartz and glass shards, roughly retaining their original appearance. The tuffites range in composition from dacite to rhyolite. The collected dataset shows that zeolitization is most abundant in coarser-grained deposits and points to a genetic process that mainly involves an open hydrothermal environment governed by aqueous fluids with significant marine component, in post eruption conditions.
Marco E. Ciriotti

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Massimo Russo
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Iscritto il: mar 29 giu, 2004 12:00
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Re: Mineralogy, geochemistry and genesis of zeolites in cenozoic pyroclastic flows from the Asuni Area (Central Sardinia

Messaggio da Massimo Russo » mar 17 mar, 2020 12:43

Il link corretto è

https://www.mdpi.com/2075-163X/10/3/268

Massimo
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Massimo Russo
INGV - Osservatorio Vesuviano

"Un minerale senza nome è solo un inutile pezzo di pietra" (Massimo Russo)

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