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• W2046044518 abstract "The behaviour of H2O, F, Cl and S prior to and during the Plinian phase of the 3550-year old Avellino eruption was determined by the study of unheated primary glass inclusions and matrix glasses. The fall deposit can be divided into two sub-units on the basis of an abrupt change in colour: a phonolitic white layer at the base and a tephriphonolitic banded grey pumice layer at the top. The original tephriphonolitic magma is always found mixed with the phonolitic magma. Primary glass inclusions were only found in feldspar, amphibole and garnet associated with the white pumice. Glass inclusions in the products of the Avellino Plinian eruption contain a mean of 3.10±0.74 wt.% H2O, 0.95±0.15 wt.% F, 0.59±0.02 wt.% Cl, and 560±55 ppm S. The concentration of CO2 was below the detection limit. Coexisting matrix glasses contain similar amounts of halogens but significantly less water (∼0.5 wt.%) and sulphur (∼100 ppm), suggesting that during the eruption the halogens did not behave as volatiles. Owing to the lack of primary glass inclusions and its hybrid nature, similar conclusions can only be hypothesised for the tephriphonolitic magma on the basis of volatile element distribution in the matrix glasses. Taking into account both our data and data from parental mafic melt inclusions by a previous study by P. Marianelli and co-workers, it has been possible to reconstruct the behaviour of volatiles in the Avellino magmatic reservoir in two stages: (1) variation of volatiles during crystal fractionation; and (2) exsolution of an “excess” gas phase when volatiles reach their solubility limit in silicate melts. The agreement between our data and the solubility limit of chlorine, sulphur and probably water in phonolitic melts at the postulated pressure and temperature (i.e., 100 MPa and 850°C), suggests that such a phase exists. Compared to the other volatiles, fluorine does not exhibit a behaviour (i.e., flat distribution) consistent with the attainment of its solubility limit in phonolites. Using the petrologic method, the minimum output of volatiles during the Plinian phase of the Avellino eruption was hypothesised to be about 2×106 tons of H2SO4 and 25×106 tons of H2O. Due to both the presence of an “excess” vapour phase prior to eruption and the assumptions inherent in the petrologic method, the total calculated amounts should be considered as very conservative estimates of volatile outputs during the eruption." @default.
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• W2046044518 date "1999-11-01" @default.
• W2046044518 modified "2023-09-23" @default.
• W2046044518 title "Pre-eruptive volatile (H2O, F, Cl and S) contents of phonolitic magmas feeding the 3550-year old Avellino eruption from Vesuvius, southern Italy" @default.
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• W2046044518 doi "https://doi.org/10.1016/s0377-0273(99)00117-1" @default.
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