Evidence for an unknown explosive eruption of Mt. Etna volcano (Italy) during the Late Glacial

We report on the geochemical and chronological characterization of a tephra layer, here called RdV-T1, recovered
within a continental sequence at Riparo di Venere site in the Fucino Basin (central Italy). Textural, mineralogical,
and detailed geochemical (major and trace elements on single glass shard) analyses indicate thatMt. Etna is the
volcanic source. Radiocarbon dating of charred materials above and belowthis tephra layer result in 13,380±40
(16,260–15,920 cal yrs BP) and 13,620±40 (16,625–16,230 cal yrs BP) 14C years BP, respectively. This age points
out that RdV-T1 tephra derives fromthe Late Pleistocene activity of the Ellittico caldera-forming phase of Mt. Etna
that is significantly (up to 1750 yrs) younger than the Biancavilla Ignimbrites and upper Acireale fall, which are
the last known events of this eruptive cycle. In addition, the RdV-T1 tephra geochemical signature is distinctwith
respect to the Biancavilla Ignimbrites and upper Acireale fall. Therefore, the radiocarbon and geochemical data
consistently indicate that the RdV-T1 tephra may represent an explosive event following the Biancavilla Ignimbritesand the upper Acireale fall not yet identified.