0000000000097859
AUTHOR
Pasquale Nuccio
Evidence of a recent input of magmatic gases into the quiescent volcanic edifice of Panarea, aeolian Islands, Italy
He isotopes in fluid inclusions of mafic phenocrysts from the Plio-Quaternary volcanism in Italy.
Constraints on mantle source and interactions from He-Sr isotope variation in Italian Plio-Quaternary volcanism.
[1] Helium isotope ratios of olivine and pyroxene phenocrysts from Plio-Quaternary volcanic rocks from southern Italy (seven Aeolian Islands, Mt. Vulture, Etna, Ustica, and Pantelleria) range from 2.3 to 7.1 Ra. Importantly, the phenocryst 3He/4He correlate well with whole rock Sr isotopic composition (0.70309– 0.70711), reflecting the mixing of two sources. A significant contribution of He from crustal contamination is recorded only occasionally (e.g., pyroxenes from Vulcano). When merged with data from the Roman Comagmatic Province, a remarkably strong near-linear He-Sr isotope correlation is apparent. The general northward decrease in 3He/4He corresponds to an increase in 87Sr/86Sr (and …
Noble gases in tracking volcanic processess
The expressions able to evaluate the contributions of the three natural sources of helium (e.g., atmosphere,in magma, following the solubility model proposed by Nuccio and Paonita (2001). In particular, variations of He/Ne and He/CO2 ratios have been used to compute the initial and final pressure of an ascending magma (Fig. 2) (Caracausi et alii 2003b, Rizzo et alii 2006). This model was subsequently implemented with S, Cl and F (Aiuppa et alii 2004), providing an useful geochemical tool aimed at giving an early warning for forecasting volcanic eruptions. The high helium flux measured at Mefite d’Ansanto in the Irpinian Apennines, displaying a He isotope composition analogous to that of Mt.…
Submarine hydrothermal fluids: new improvements of sampling device and techniques.
Groundwater residence time estimations based on heat and 4He abundance: an application to Western Sicily (Italy) hydrothermal systems.
Mount Etna: dynamics of magma degassing and ascent towards the shallow levels of the feeding system
Evidence of Two-Component Iblean-Like Mantle From 2001-2006 Igneous Products of Mount Etna
Geochemical monitoring of some peripheral gas emissions at Mount Etna: insights on its plumbing system
Noble Gases Investigation on Etnean Volcanic Gases and on the Erupted Products During the 2001-2006 Period
Data acquired during the last 20 years of geochemical monitoring of volcanic gases lead us to better understand how volcanoes work. According to theoretical and experimental investigations, both the chemical and isotopic changes in sampled volcanic gases have been interpreted in terms of magma ascent using the models proposed by Nuccio & Paonita, (2001) and Caracausi et al. (2003). On the basis of numerical simulations of volatile degassing, we have been able to recognize episodes of magma migration from deeper reservoirs of Mount Etna to the shallower storage volume, until magma is erupted. The 3He/4He isotope ratios of gas emitted at the periphery of Mount Etna volcanic edifice exhibit sy…