Uncommon K-foiditic magmas: The case study of Tufo del Palatino (Colli Albani Volcanic District, Italy)

Petrographical and geochemical criteria for a chronology of Roman mortars between the first century bce and the second century ce: The Curia of Pompey the Great

“…While the observation of calcite, as also suggested by its presence in mortars of different epochs (Table 1), is not considered a very discriminating element and is essentially linked to the good workmanship of the thin sections, the presence of volcanic glass, which is rare in the Colli Albani pyroclastic rocks (Gaeta et al, 2021), constitutes a strongly discriminating element on the origin of the aggregate. Actually, the presence of volcanic glass indicates a peculiar zone of the Pozzolane Rosse deposit characterized by a high cooling rate (Gaeta et al, 2021).…”

“…While the observation of calcite, as also suggested by its presence in mortars of different epochs (Table 1), is not considered a very discriminating element and is essentially linked to the good workmanship of the thin sections, the presence of volcanic glass, which is rare in the Colli Albani pyroclastic rocks (Gaeta et al, 2021), constitutes a strongly discriminating element on the origin of the aggregate. Actually, the presence of volcanic glass indicates a peculiar zone of the Pozzolane Rosse deposit characterized by a high cooling rate (Gaeta et al, 2021). Considering the presence or absence of glassy scoria clasts and the macroscopic characters related to their size (granulometry) and colour (proportion between red and black scoria), the aggregates of the analysed mortars were classified and grouped by homogeneous phases, as described below and summarized in Table 1.…”

Experimental investigation of trace element partitioning between amphibole and alkali basaltic melt: Toward a more general partitioning model with implications for amphibole fractionation at deep crustal levels

“…The trace element compositions of the experimental residual glasses, on the other hand, do not correspond to those of the calc-alkaline rocks of Campi Flegrei. This difference is not surprising because geochemical models of magmatic suites deriving from metasomatic mantle sources should be computed on co-magmatic end-members (e.g., Gaeta et al 2016Gaeta et al , 2021 We used submarine basalt to trachybasalt compositions from the Pontine archipelago area to model the trace element abundances due to the fractional crystallization of amphibole. These rocks have been interpreted to be the primitive/intermediate lithologies representing parental compositions for the >1 Ma, peralkaline felsic rocks outcropping in the western Pontine Islands (Conte et al 2016(Conte et al , 2020.…”

Base Cation Mobility in Vineyard Soils of the Colli Albani Volcanic District (Central Italy)

“…Consequently, in the cooling and degassing stage of the TVS bedrock, a large part of the leucite is turned into analcime, and the matrix glass is turned in chabazite, phillipsite, and Al-rich amorphous phase by similar reactions. However, pristine glasses are rare in the Colli Albani volcanic rocks (Gaeta 1998) also for the low viscosity of K-foiditic magmas that increase the crystal growth rate and hamper glass formation (Bonechi et al 2020;Gaeta et al 2021). The compositional and mineralogical peculiarities of the TVS bedrock control the abundance of leucite, analcime (± other zeolites), clinopyroxene, and phlogopite crystals in the vineyard soils.…”

“…The Alban grown in the Colli Albani was one of the most ancient wines attested in Pliny's Naturalis Historia (77-78 AD). Interestingly, the Colli Albani soils developed on pyroclastic rocks with a peculiar K-foiditic composition (Gaeta et al 2006(Gaeta et al , 2021Boari et al 2009;Fabbrizio et al 2018) and their in-depth knowledge is essential to respond to the current and increasingly demand sustainable soil use. For example, ensuring naturally K levels in the berry, adequate to the request wine quality, is very desirable because it would reduce input and waste management costs at the winery (Mpelasoka et al 2003).…”