A case study of zeolitization process: “Tufo Rosso a Scorie Nere” (Vico volcano, Italy): inferences for a general model

Abstract

Abstract. This paper focuses on the authigenic mineralization processes acting on “Tufo Rosso a Scorie Nere” (TRS), i.e. one of the main pyroclastic units of the Vico stratovolcano (Latium, Italy). The pyroclastic deposits appear in general massive and made of “black vitreous vesiculated juvenile scoriae”, immersed in an ashy matrix lithified after zeolitization processes. The main minerals are chabazite and phillipsite, and the zeolitic content is locally variable, reaching 68 % wt. Zeolites grow replacing both amorphous fraction and pre-existing phases, occurring inside both matrix and scoriae. Concerning scoriae, zeolitization moves from the rim to the core of the scoriaceous fragment as a function of (a) temperature of the fluids and (b) permeability (primary or secondary). Composition of parental fresh glass and that of zeolitized rocks is compatible with trachyte chemistry, lightly undersaturated in SiO2, and the alteration processes modified the parental rock chemical features. Zeolites genesis is ascribed to a “geoautoclave-like system”, and zeolites display a Si/Al ratio similar to that of the parental glasses. TRS presents promising mineralogical characteristics as supplementary cementitious material in the production of mixed cements.

Flörkeite, (K3Ca2Na)[Al8Si8O32]·12H2O: A Rare Zeolite from Pyrometamorphic Rocks of the Hatrurim Complex, Israel

“…Phillipsite-Ca and clinoptilolite-Ca are rarely observed. Compared to the present data, the zeolite mineralization of the olive unit is characterized by a higher Si/Al ratio, as evidenced by the presence of clinoptilolite Ca 3 (Si 30 Al 6 )O 72 •20H 2 O. Si/Al ratio differences could be related to the protoliths diversity [48][49][50]. A low Si/Al ratio in zeolites displays a highly alkaline environment [1,48,[50][51][52][53].…”

On the suitability of phillipsite-chabazite zeolitite rock for ammonia uptake in water: a case study from the Pescara River (Italy)

“…Zeolitite used in this study is the “Tufo Rosso a Scorie Nere” (TRS), ( 27 , 28 and references therein) the largest pyroclastic flow related to the ancient volcano of Vico, a deposit that extends on a surface of about 1300 km 2 This pyroclastic flow deposit is essentially massive and commonly made of black vitreous vesiculated juvenile elements immersed inside a yellow zeolitized ash matrix 27 , 28 . TRS rock was finely ground (particle size < 60 µm) and analysed by powder X-ray diffraction (PXRD) on a Siemens D5000 diffractometer operating with Bragg–Brentano geometry; CuKα = 1.518 Å, 40 kV, 40 mA, 2°–45° 2θ scanning interval, step size 0.020° 2θ) (Fig.…”

“…In most of cases reported in technical literature, ammonia uptake by natural zeolite is referred to clinoptilolite-mordenite zeolitites. For this reason, we test here the efficacy for ammonia uptake of an italian chabazite-phillipsite zeolitite the so-called “Tufo Rosso a Scorie Nere” (TRS) 27 , 28 , coming from the Latial Province (Central Italy), used in the regeneration of sewage waters of the San Giustino channel, a tributary of the Pescara River (Abruzzo Region, Central Italy). Preliminary experiments based on continuous column process were performed in laboratory.…”

Ignimbrites Related to Neogene Volcanism in the Southeast of the Iberian Peninsula: An Experimental Study to Establish Their Pozzolanic Character

“…Columbu and Garau [ 10 ] have researched this field using mineralogical, petrographic, and chemical studies of samples of ignimbrite used in antiquity in the construction of the Roma Nora Theatre. Novembre et al [ 11 ] emphasize the importance of ignimbrite as a high-quality cementitious material. This quality is attributed to the presence of zeolitic secondary mineral phases, which infer a strong pozzolanic nature to ignimbrite and a high hydraulic reactivity to the cement–pozzolan interface within the mortar.…”