New insights into the mineralogical facies distribution of Campanian Ignimbrite, a relevant Italian industrial material

Langella, Alessio; Bish, David L.; Cappelletti, Piergiulio; Cerri, Guido; Colella, Abner; Gennaro, Roberto de; Graziano, Sossio Fabio; Perrotta, Annamaria; Scarpati, Claudio; Gennaro, Maurizio de

doi:10.1016/j.clay.2013.01.008

Cited by 42 publications

(44 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…WGI ( Fig. 2c and d), feldspathized by authigenic mineralization processes, is made up of reversely graded black scoriae embedded in an ashy matrix with subordinate lithics and crystals (Cappelletti et al, 2003;Langella et al, 2013). WGI contains hypidiomorphic phenocrysts of alkali-feldspars with minor amounts of clinopyroxene, as well as microlites of alkalifeldspar, Ti-magnetite and apatite.…”

Section: Materials Investigatedmentioning

confidence: 99%

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

et al. 2014

View full text Add to dashboard Cite

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.

show abstract

Section: Materials Investigatedmentioning

confidence: 99%

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

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The inclusion of natural zeolite minerals which display solid-solution ranges was considered important as these minerals are reported widely in occurrence studies and have considerable value in geochemical discrimination when used in conjunction with paragenesis information (e.g. Heister et al, 2001;Weisenberger and Spürgin, 2009;Weisenberger et al, 2012Weisenberger et al, , 2014Langella et al, 2013;Campbell et al, 2015;Cappelletti et al, 2015). The solid-solution samples additionally have value in monitoring reproducibility (see Test 5).…”

Section: Reference Sample Selectionmentioning

confidence: 99%

“…Based on the recommendations of London (1996, 2005), and on recent studies of natural zeolites (Langella et al, 2013;Weisenberger et al, 2014;Henderson et al, 2014), the priority was to analyse Na and Al first (TAP detectors) with K and Ca (PET detectors), and Cs (LIF) simultaneously, followed immediately by the other elements (Si, Mg, Sr, Ba and Fe). Rubidium was monitored in initial runs, but never detected (limit of detection generally <0.06 wt.% Rb 2 O for most zeolites, and 0.21 wt.% Rb 2 O for pollucite).…”

Section: Element Set-upmentioning

confidence: 99%

mentioning

confidence: 99%

“…Neuhoff et al, 2000;Bish and Ming, 2001;Giampaolo et al, 2008;Campbell et al, 2012;Langella et al 2013;Weisenberger et al, 2014;Cappelletti et al, 2015). This has particular relevance to hydrothermal, surface and diagenetic systems, where mineral compositions can track changing fluid regimes (Hay and Sheppard, 2001;Langella et al, 2001;Utada, 2001, Campbell et al, 2012Langella et al 2013;Weisenberger et al 2014). Where natural mineral reaction paths involving zeolites are combined with other geological criteria, they have potential value in mineral exploration (Campbell et al, 2012(Campbell et al, , 2013(Campbell et al, , 2014, in deepening understanding of global carbon cycling and climate change (Heister et al, 2001;Campbell et al, 2012) and in contributing to the rationalization of volcanic hazard processes (Giampaolo et al, 2008;Bear et al, 2009;Vignaroli et al, 2014).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Determination of zeolite-group mineral compositions by electron probe microanalysis

et al. 2016

View full text Add to dashboard Cite

A new protocol for the quantitative determination of zeolite-group mineral compositions by electron probe microanalysis (wavelength-dispersive spectrometry) under ambient conditions, is presented. The method overcomes the most serious challenges for this mineral group, including new confidence in the fundamentally important Si-Al ratio. Development tests were undertaken on a set of natural zeolite candidate reference samples, representing the compositional extremes of Na, K, Cs, Mg, Ca, Sr and Ba zeolites, to demonstrate and assess the extent of beam interaction effects on each oxide component for each mineral. These tests highlight the variability and impact of component mobility due to beam interaction, and show that it can be minimized with recommended operating conditions of 15 kV, 2 nA, a defocused, 20 μm spot size, and element prioritizing with the spectrometer configuration. The protocol represents a pragmatic solution that works, but provides scope for additional optimization where required. Vital to the determination of high-quality results is the attention to careful preparations and the employment of strict criteria for data reduction and quality control, including the monitoring and removal of non-zeolitic contaminants from the data (mainly Fe and clay phases). Essential quality criteria include the zeolite-specific parameters of R value (Si/(Si + Al + Fe 3+ ), the 'E%' charge-balance calculation, and the weight percent of non-hydrous total oxides. When these criteria are applied in conjunction with the recommended analytical operating conditions, excellent inter-batch reproducibility is demonstrated. Application of the method to zeolites with complex solid-solution compositions is effective, enabling more precise geochemical discrimination for occurrence-composition studies. Phase validation for the reference set was conducted satisfactorily with the use of X-ray diffraction and laser-ablation inductively-coupled plasma mass spectroscopy.

show abstract

Local production and imitations of Late Roman pottery from a well in the Roman necropolis of Cuma in Naples, Italy

et al. 2018

View full text Add to dashboard Cite

Archaeological excavations performed in a funerary complex in Cuma (Campania region, Italy) unearthed excellently preserved common wares dated to the third century A.D. Archaeometric analyses were focused on Campanian pitchers, Aegean‐like cooking pots, and pyriform pitchers, the latter recorded for the first time in an Italian context. The local pitchers were manufactured with a high‐CaO clay (CaO = ca. 12 wt.%) and local volcanic temper, fired at ca. 800–850°C, as suggested by the presence of calcite. The Aegean‐like pots and the pyriform pitchers were made with low‐CaO clay (CaO ≤ 4.0 wt.%) mixed with a calcite‐bearing temper, along with volcanic and siliciclastic grains, and fired at 800–950°C. The comparison with raw materials inferred that local vessels were made with low‐CaO basinal clays which outcrop in the northern Campania region, and sands from the shoreline north of Cuma where carbonate, siliciclastic and volcanic phases mix together. Our results suggest that the Phlegraean Late Roman workshops produced their traditional vases along with imitations of Aegean‐like pottery. Thus, microregional production responded to a market demand requiring shapes and styles similar to imports from the eastern Mediterranean, with which commercial trade was still quite active.

show abstract

New insights into the mineralogical facies distribution of Campanian Ignimbrite, a relevant Italian industrial material

Cited by 42 publications

References 49 publications

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

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

Determination of zeolite-group mineral compositions by electron probe microanalysis

Local production and imitations of Late Roman pottery from a well in the Roman necropolis of Cuma in Naples, Italy

Contact Info

Product

Resources

About