Mauro Martelli

TL;DR: In this paper, the authors investigated gas emissions in the Southern Apennine axial zone of the Adriatic plate and found that CO2 emissions are generally CO2-dominated, have 3He/4He ratios in the range of 0.09-2.84 Ra, and display both 3He and 4He outputs in the ranges of those reported for the Italian active volcanoes Phlegrean Fields and Vulcano.

TL;DR: A 4-year geochemical survey of some fumaroles at the Voragine summit crater of Mt Etna was performed in combination with synchronous monitoring of peripheral gas emissions at the base of the volcano.

TL;DR: In this paper, Caracausi et al. identified signals of magma ascent preceding these eruptions by geochemical monitoring of both chemical composition and He-isotope ratio of gas emissions.

TL;DR: The 3He/4He of Pantelleria, Etna, Iblei, Ustica, Alicudi, and Filicudi basalts (7.0 ± 0.6 Ra) are consistent with a HIMU-type mantle that either is younger than the Cook-Austral island end-member or has a lower 238U/204Pb as mentioned in this paper.

TL;DR: In this paper, the authors show that non-equilibrium fractionations among He, Ar and CO 2, driven by their different diffusivities in silicate melts, are common in most of the natural conditions of magma decompression and their signature strongly depends on pressure of degassing.