Genesis of zeolites in the Neapolitan Yellow Tuff: geological, volcanological and mineralogical evidence

de’Gennaro, M.; Cappelletti, Piergiulio; Langella, Alessio; Perrotta, Annamaria; Scarpati, Claudio

doi:10.1007/s004100050571

Cited by 123 publications

(65 citation statements)

References 20 publications

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“…Microanalyses of the substrate, always composed of Neapolitan Yellow Tuff (NYT), revealed the presence of the same elemental composition in both sites (Al, Ba, Cd, Co, Cu, Fe, K, Mg, Mn, Na, Si, Sr, Ti, U, and Zn), albeit elements were present at different concentrations. Mineralogical composition of investigated samples confirmed the composition of NYT, mainly phillipsite, chabazite, and analcime, and hydrous aluminosilicates pertaining to the zeolite group, along with feldspars and minor amounts of clay minerals (de'Gennaro et al, 2000). Data from the literature (Morra et al, 2010) state high porosity values for NYT, which is characterized, moreover, by the presence of micropores causing a high capillary absorption of water that allows microbial growth.…”

Section: Resultsmentioning

confidence: 70%

A survey of the algal flora of anthropogenic caves of Campi Flegrei (Naples, Italy) archeological district

Cennamo¹,

Marzano²,

Ciniglia³

et al. 2012

JCKS

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Campi Flegrei is a large volcanic area situated northwest of Naples, Italy. Two archeological sites, the Sybil's Cave and the Piscina Mirabilis, are artificial caves dug in the yellow tuff and used during antiquity for various purposes. This paper describes for the first time the algal biodiversity of these caves and determines whether environmental factors such as light intensity and humidity are influential in species distribution. A total of twenty-two algal species were identified by molecular methods (18S rDNA); the largest group was Cyanobacteria (eleven species), followed by algae Chlorophyta (six), Rhodophyta (two) and Bacillariophyta (two). Cluster analysis of algal distribution in the caves in relation to light and humidity showed no relevant differences in algal distribution between the two caves. Three different algal groups were identified. The first one includes strains strictly dependent on low humidity, a second cluster was mainly associated with sites where humidity is not a severe constraint, and a third group, mainly represented by filamentous cyanobacteria, is probably dependent on high humidity, since it was detected only at Piscina Mirabilis.

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Section: Resultsmentioning

confidence: 70%

A survey of the algal flora of anthropogenic caves of Campi Flegrei (Naples, Italy) archeological district

Cennamo¹,

Marzano²,

Ciniglia³

et al. 2012

JCKS

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“…The mean content of these zeolites in NYT can exceed 50 % (e.g. de Gennaro et al, 1990de Gennaro et al, , 2000. WGI ( Fig.…”

Section: Materials Investigatedmentioning

confidence: 99%

“…NYT (Fig. 2a, b), a trachytic pyroclastic deposit characterized by both pyrogenic and authigenic phases (de Gennaro et al, 2000), contains phenocrysts of sanidine, plagioclase, clinopyroxene, biotite, and minor amounts of Timagnetite and apatite within a matrix of pumiceous lapilli and glassy ash (glass shards and blocky shaped glass fragments). X-ray diffraction pattern analysis has indicated the presence of phillipsite, chabazite, and analcime .…”

Section: Materials Investigatedmentioning

confidence: 99%

The permeability and elastic moduli of tuff from Campi Flegrei, Italy: implications for ground deformation modelling

et al. 2014

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Abstract. The accuracy of ground deformation modelling at active volcanoes is a principal requirement in volcanic hazard mitigation. However, the reliability of such models relies on the accuracy of the rock physical property (permeability and elastic moduli) input parameters. Unfortunately, laboratory-derived values on representative rocks are usually rare. To this end we have performed a systematic laboratory study on the influence of pressure and temperature on the permeability and elastic moduli of samples from the two most widespread lithified pyroclastic deposits at the Campi Flegrei volcanic district, Italy. Our data show that the water permeability of Neapolitan Yellow Tuff and a tuff from the Campanian Ignimbrite differ by about 1.5 orders of magnitude. As pressure (depth) increases beyond the critical point for inelastic pore collapse (at an effective pressure of 10-15 MPa, or a depth of about 750 m), permeability and porosity decrease significantly, and ultrasonic wave velocities and dynamic elastic moduli increase significantly. Increasing the thermal stressing temperature increases the permeability and decreases the ultrasonic wave velocities and dynamic elastic moduli of the Neapolitan Yellow Tuff; whereas the tuff from the Campanian Ignimbrite remains unaffected. This difference is due to the presence of thermally unstable zeolites within the Neapolitan Yellow Tuff. For both rocks we also find, under the same pressure conditions, that the dynamic (calculated from ultrasonic wave velocities) and static (calculated from triaxial stress-strain data) elastic moduli differ significantly. The choice of elastic moduli in ground deformation modelling is therefore an important consideration. While we urge that these new laboratory data should be considered in routine ground deformation modelling, we highlight the challenges for ground deformation modelling based on the heterogeneous nature (vertically and laterally) of the rocks that comprise the caldera at Campi Flegrei.

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“…A substantial portion of this volcaniclastite (> 50 vol.-%) was involved in diffuse zeolitization processes that determined the crystallization of phillipsite and, subordinately, chabazite and analcime. The main content of these authigenic phases generally exceeds 50 wt.-% and sometimes can reach 70±80 wt.-% [34][35][36][37]. It owes its fame to the lithified facies that have been used as a building material since ancient times because of its color, light weight, and good insulating properties; at the same time, it is weak enough to be easily sewn into dimension stones.…”

Section: Resultsmentioning

confidence: 99%

Frontal polymerization as a convenient technique for the consolidation of tuff

et al. 2009

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Abstract:Frontal Polymerization was successfully exploited as an innovative technique for the consolidation of Neapolitan Yellow Tuff, the main volcaniclastic rock of Campania region (Italy). The protocol used and the full characterization in terms of mechanical properties of the resulting consolidated stone are presented here and discussed together with the data obtained by X-ray tomography as a non destructive analytical technique for determining the internal map of the consolidated material. The proposed treatment definitely succeeded from the technical point of view resulting in an enhancement of mechanical properties.

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Genesis of zeolites in the Neapolitan Yellow Tuff: geological, volcanological and mineralogical evidence

Cited by 123 publications

References 20 publications

A survey of the algal flora of anthropogenic caves of Campi Flegrei (Naples, Italy) archeological district

A survey of the algal flora of anthropogenic caves of Campi Flegrei (Naples, Italy) archeological district

The permeability and elastic moduli of tuff from Campi Flegrei, Italy: implications for ground deformation modelling

Frontal polymerization as a convenient technique for the consolidation of tuff

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