Constraining the volatile evolution of mafic melts at Mt. Somma–Vesuvius, Italy, based on the composition of reheated melt inclusions and their olivine hosts
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Published:2023-11-09
Issue:6
Volume:35
Page:921-948
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ISSN:1617-4011
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Container-title:European Journal of Mineralogy
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language:en
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Short-container-title:Eur. J. Mineral.
Author:
Esposito RosarioORCID, Redi Daniele, Danyushevsky Leonid V., Gurenko Andrey, De Vivo BenedettoORCID, Manning Craig E., Bodnar Robert J., Steele-MacInnis Matthew, Frezzotti Maria-Luce
Abstract
Abstract. Mount Somma–Vesuvius is a stratovolcano that represents a geological hazard to the population of the city of Naples and surrounding towns in southern Italy. Historically, volcanic eruptions at Mt. Somma–Vesuvius (SV) include high-magnitude Plinian eruptions, such as the infamous 79 CE eruption that occurred after 295 years of quiescence and killed thousands of people in Pompeii and surrounding towns and villages. The last eruption at SV was in 1944 and showed a Volcanic Explosivity Index (VEI) of 3 (0.01 km3 of volcanic material erupted). Following the 1944 eruption, SV has been dormant for the past nearly 79 years, with only minor fumarolic and seismic activity. During its long history, centuries of dormancy at SV have ended with Plinian eruptions (VEI 6) that signal the beginning of a new cycle of eruptive activity. Thus, the current dormancy stage demands a need to better understand the mechanism involved in high-magnitude eruptions in order to better predict future eruption magnitude and style. Despite centuries of research on the SV volcanic system, many questions remain, including the evolution of magmatic volatiles from deep primitive magmas to shallower more evolved magmas. Developing a better understanding of the physical and chemical processes associated with volatile evolution at SV can provide insights into magma dynamics and the mechanisms that trigger highly explosive eruptions at SV. In this study, we present new data for the pre-eruptive volatile contents of magmas associated with four Plinian and two inter-Plinian eruptions at SV based on analyses of reheated melt inclusions (MIs) hosted in olivine. We correct the volatile contents of bubble-bearing MIs by taking into account the volatile contents of bubbles in the MIs. We recognize two groups of MIs: one group hosted in high-Fo olivine (Fo85–90) and relatively rich in volatiles and the other group hosted in low-Fo olivine (Fo70–69) and relatively depleted in volatiles. The correlation between volatile contents and compositions of host olivines suggests that magma fractionation took place under volatile-saturated conditions and that more differentiated magmas reside at shallower levels relative to less evolved/quasi-primitive magmas. Using the CO2 contents of corrected MIs hosted in Fo90 olivine from SV, we estimate that 347 to 686 t d−1 of magmatic CO2 exsolved from SV magmas during the last 3 centuries (38–75 Mt in total) of volcanic activity. Although this study is limited to only few SV magmas, we suggest that further study applying similar methods could shed light on the apparent lack of correlation between the volatile contents of MIs and the style and age of eruptions. Further, such studies could provide additional constraints on the origin of CO2 and the interaction between the carbonate platform and ascending magmas below SV.
Funder
National Science Foundation
Publisher
Copernicus GmbH
Subject
Pulmonary and Respiratory Medicine,Pediatrics, Perinatology and Child Health
Reference126 articles.
1. Allison, C. M., Roggensack, K., and Clarke, A. B.: MafiCH: a general model for H2O–CO2 solubility in mafic magmas, Contrib. Mineral. Petr., 177, 1–22, 2022. 2. Avanzinelli, R., Casalini, M., Elliott, T., and Conticelli, S.: Carbon fluxes from subducted carbonates revealed by uranium excess at Mount Vesuvius, Italy, Geology, 46, 259–262, 2018. 3. Ayuso, R. A., De Vivo, B., Rolandi, G., Seal II, R. R., and Paone, A.: Geochemical and isotopic (Nd–Pb–Sr–O) variations bearing on the genesis of volcanic rocks from Vesuvius, Italy, J. Volcanol. Geoth. Res., 82, 53–78, https://doi.org/10.1016/S0377-0273(97)00057-7, 1998. 4. Balcone-Boissard, H., Villemant, B., Boudon, G., and Michel, A.: Non-volatile vs volatile behaviours of halogens during the AD 79 plinian eruption of Mt. Vesuvius, Italy, Earth Planet. Sc. Lett., 269, 66–79, 2008. 5. Balcone-Boissard, H., Boudon, G., Ucciani, G., Villemant, B., Cioni, R., Civetta, L., and Orsi, G.: Magma degassing and eruption dynamics of the Avellino pumice Plinian eruption of Somma–Vesuvius (Italy). Comparison with the Pompeii eruption, Earth Planet. Sc. Lett., 331, 257–268, 2012.
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