Revision of the tephrostratigraphy previously proposed for the marine core AD91-17 (Adriatic Sea), supported by energy- dispersive-spectrometry (EDS) chemical data, has allowed to challenge previous interpretation and proposed a core chronology on the basis of new tephrochronological data. Four different tephra layers were identified and correlated with known eruption from southern Italian volcanoes. The upper tephra layer was tentatively correlated with AD 1631eruption from Somma-Vesuvius, specifically using chemical composition of pyroxenes. The second one (actually represented by two distinct layers), due to pervasive alteration of glass shards, is difficult to be correlated even if is attributed to Somma-Vesuvius volcano. Close to sapropel S1 interruption a rhyolitic layer was correlated to E1/Gabellotto-Fiumebianco eruption from Lipari (Aeolian Islands). The lowermost tephra layers are correlated to the Mercato eruption (Somma-Vesuivus). This seems to confirm the multiple occurrence of Mercato distal deposits in distal areas, as testi- fied by other findings in Mediterranean cores. This suggests that this eruption is probably more complex than previously hypothesised, and characterised by at least two phases fed by the same phonolitic magma.
Tephrostratigraphy of marine core AD91-17 (Adriatic Sea) revised
Luigi Vigliotti;Lucilla Capotondi;
2014
Abstract
Revision of the tephrostratigraphy previously proposed for the marine core AD91-17 (Adriatic Sea), supported by energy- dispersive-spectrometry (EDS) chemical data, has allowed to challenge previous interpretation and proposed a core chronology on the basis of new tephrochronological data. Four different tephra layers were identified and correlated with known eruption from southern Italian volcanoes. The upper tephra layer was tentatively correlated with AD 1631eruption from Somma-Vesuvius, specifically using chemical composition of pyroxenes. The second one (actually represented by two distinct layers), due to pervasive alteration of glass shards, is difficult to be correlated even if is attributed to Somma-Vesuvius volcano. Close to sapropel S1 interruption a rhyolitic layer was correlated to E1/Gabellotto-Fiumebianco eruption from Lipari (Aeolian Islands). The lowermost tephra layers are correlated to the Mercato eruption (Somma-Vesuivus). This seems to confirm the multiple occurrence of Mercato distal deposits in distal areas, as testi- fied by other findings in Mediterranean cores. This suggests that this eruption is probably more complex than previously hypothesised, and characterised by at least two phases fed by the same phonolitic magma.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
