The Kamchatka peninsula, in the north-western part of the Paciﬁc ’Ring of Fire’, is one of the most active volcanic realms on Earth, with 29 historically erupting volcanoes along its 700 km-long Eastern Volcanic Belt (EVB). This notwithstanding, volatile input and output ﬂuxes along this arc sector have remained poorly characterised until very recently. We here report on the very ﬁrst assessment of volatile ﬂux emissions from Gorelyi, a large (25 km3, 1830 m high) and most active shield-like Holocene volcano located on the southern segment of the Kamchatka EVB. By combing results from a variety of in situ and remote sensing techniques (MultiGAS, ﬁlter packs, and UV camera), we determine the bulk plume molar concentrations of major (H2O 93.5%, CO2 2.6%, SO2 2.2%, HCl 1.1%, HF 0.3%, H2 0.2%) to trace-halogens (Br, I) and trace-element volatile species, and we estimate a total gas release of 11,000 t/day from Gorelyi during 900°C non-eruptive degassing. Using this observation, we derive new constraints on the abundances and origins of volatiles in the subduction-modiﬁed mantle source feeding magmatism in Kamchatka.
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2012|