Relationships between Campi Flegrei and Mt. Somma volcanism: evidence from melt inclusions in clinopyroxene phenocrysts from volcanic breccia xenoliths

Danyushevsky, Leonid V.; Lima, Annamaria

doi:10.1007/s007100170013

Cited by 14 publications

(4 citation statements)

References 28 publications

(13 reference statements)

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“…Our results agree well with lines of independent geochemical evidence that are supportive of the presence of an extended magmatic source responsible for Ignimbritic events and subsequently for Vesuvio and Campi Flegrei (e.g. Danyushevsky and Lima, 2001; De Vivo et al. , 2001; Rolandi et al.…”

Section: Discussionsupporting

confidence: 91%

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Low shear-velocity zone in the Neapolitan-area crust between the Campi Flegrei and Vesuvio volcanic areas

Nunziata

2010

Terra Nova

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Terra Nova, 22, 208–217, 2010 Abstract Some Vesuvio earthquakes recorded at OV‐INGV stations in the Campi Flegrei volcanic area have been processed by FTAN (frequency–time analysis) method. The group velocities of Rayleigh‐wave fundamental mode have been extracted in the period range 0.7–3 s. Regional group and phase velocity data have been considered as well at the inversion stage. Average shear wave velocity models for the uppermost 73 km of the lithosphere below the Neapolitan area, midway between Campi Flegrei and Vesuvio volcanic areas, have been obtained by the hedgehog nonlinear inversion method. The resulting structural models are characterized by the presence of the carbonate horizon at about 3 km depth. A main feature is represented by low VS velocities around 9 km depth. This low‐velocity layer, already found below both Campi Flegrei and Vesuvio, can be reasonably interpreted as a magmatic reservoir of Campania active volcanoes.

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Section: Discussionsupporting

confidence: 91%

“…Independent geochemical evidence supports the presence of an extended magmatic source under the Campanian Plain responsible for Ignimbritic events and subsequently for Vesuvio and Campi Flegrei (e.g. Danyushevsky and Lima, 2001).…”

Section: Introductionmentioning

confidence: 83%

Low shear-velocity zone in the Neapolitan-area crust between the Campi Flegrei and Vesuvio volcanic areas

Nunziata

2010

Terra Nova

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“…This lack of correlation indicates that bulk rock compositions represent a mixture of various proportions of clinopyroxene and/or olivine cumulus material and evolved phonolitic and trachytic magmas. For example, major-element compositions of bulk rocks from the post-472 CE eruptions with MgO > 4 wt % could reflect incorporation of variable amounts of clinopyroxene into a relatively evolved melt as reported by Danyushevsky and Lima (2001). Also, bulk rock compositions of pre-19.2 ka eruptions showing high K 2 O concentrations exhibit geochemical trends that reflect addition of large proportions of olivine in addition to clinopyroxene.…”

Section: Introductionmentioning

confidence: 72%

Constraining the volatile evolution of mafic melts at Mt. Somma–Vesuvius, Italy, based on the composition of reheated melt inclusions and their olivine hosts

Esposito,

Redi,

Danyushevsky

et al. 2023

Eur. J. Mineral.

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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.

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“…The other, of larger impact, is the bradyseism (slow vertical ground movement) of the Campi Flegrei caldera [ Lima et al ., ], with two uplift episodes: one of 1.7 m between 1969 and 1972, the other of 1.8 m between 1982 and 1984 (the overall period 1969–1984 is indicated in Figure a). Although the Campi Flegrei are located about 30 km west of the Vesuvius, there is evidence that the two volcanic systems are related or even linked [ Danyushevsky and Lima , ; Walter et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Italian seismicity and Vesuvius' eruptions synchronize on a quasi 60 year oscillation

Bragato

2015

Earth and Space Science

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The analysis of the time distribution of the major earthquakes that occurred in Italy since 1600 reveals that seismicity alternates periods of higher and lower activities over cycles of about 60 years. The same rhythm is present in the eruptive history of the Vesuvius. The large spatial scale of synchronization leads to suppose an external forcing. A hint on its possible origin comes from climatology, where a quasi 60 year cycle is found for various parameters and processes. A hypothesis, also supported by other studies, is that seismicity and volcanism are controlled by cycles of sea level rise. The mechanism could justify similar regularities observed for seismicity in other areas (e.g., cycles of earthquakes in the southern San Andreas Fault, in California) or for strong earthquakes at the global level. The increasing oceanic load of the last century could be coresponsible of the current long-lasting rest of the Vesuvius.

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Relationships between Campi Flegrei and Mt. Somma volcanism: evidence from melt inclusions in clinopyroxene phenocrysts from volcanic breccia xenoliths

Cited by 14 publications

References 28 publications

Low shear-velocity zone in the Neapolitan-area crust between the Campi Flegrei and Vesuvio volcanic areas

Low shear-velocity zone in the Neapolitan-area crust between the Campi Flegrei and Vesuvio volcanic areas

Constraining the volatile evolution of mafic melts at Mt. Somma–Vesuvius, Italy, based on the composition of reheated melt inclusions and their olivine hosts

Italian seismicity and Vesuvius' eruptions synchronize on a quasi 60 year oscillation

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