Gas Emissions From Volcanoes of the Kuril Island Arc (NW Pacific): Geochemistry and Fluxes
Por:
Taran, Yuri, Zelenski, Mikhail, Chaplygin, Ilya, Malik, Natalia, Campion, Robin, Inguaggiat, Salvatore, Pokrovsky, Boris, Kalacheva, Elena, Melnikov, Dmitri, Kazahaya, Ryunosuke, Fischer, Tobias
Publicada:
1 jun 2018
Resumen:
The Kuril Island arc extending for about 1,200 km from Kamchatka Peninsula to Hokkaido Island is a typical active subduction zone with ~40 historically active subaerial volcanoes, some of which are persistently degassing. Seven Kurilian volcanoes (Ebeko, Sinarka, Kuntomintar, Chirinkotan, Pallas, Berg, and Kudryavy) on six islands (Paramushir, Shiashkotan, Chirinkotan, Ketoy, Urup, and Iturup) emit into the atmosphere > 90% of the total fumarolic gas of the arc. During the field campaigns in 2015–2017 direct sampling of fumaroles, MultiGas measurements of the fumarolic plumes and DOAS remote determinations of the SO 2 flux were conducted on these volcanoes. Maximal temperatures of the fumaroles in 2015–2016 were 510°C (Ebeko), 440°C (Sinarka), 260°C (Kuntomintar), 720°C (Pallas), and 820°C (Kudryavy). The total SO 2 flux (in metric tons per day) from fumarolic fields of the studied volcanoes was measured as ~1,800 ± 300 t/d, and the CO 2 flux is estimated as 1,250 ± 400 t/d. Geochemical characteristics of the sampled gases include dD and d 18 O of fumarolic condensates, d 13 C of CO 2 , d 34 S of the total sulfur, ratios 3 He/ 4 He and 40 Ar/ 36 Ar, concentrations of the major gas species, and trace elements in the volcanic gas condensates. The mole ratios C/S are generally <1. All volcanoes of the arc, except the southernmost Mendeleev and Golovnin volcanoes on Kunashir Island, emit gases with 3 He/ 4 He values of >7R A (where R A is the atmospheric 3 He/ 4 He). The highest 3 He/ 4 He ratios of 8.3R A were measured in fumaroles of the Pallas volcano (Ketoy Island) in the middle of the arc. © 2018. American Geophysical Union. All Rights Reserved.
Filiaciones:
Institute of Geophysics, UNAM, Coyoacan, Ciudad de Mexico, Mexico
Institute of Volcanology and Seismology FEB RAS, Petropavlovsk-Kamchatsky, Russian Federation
Institute of Experimental Mineralogy RAS, Chernogolovka, Moscow District, Russian Federation
Insitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS, Moscow, Russian Federation
National Institute of Geophysics and Volcanology, Palermo, Italy
Geological Institute RAS, Pyzhevski 8, Moscow, Russian Federation
Geological Survey of Japan, Tsukuba, Japan
University of New Mexico, Albuquerque, NM, United States
UNAM, Inst Geophys, Coyoacan, Ciudad De Mexic, Mexico
RAS, FEB, Inst Volcanol & Seismol, Petropavlovsk Kamchatski, Russia
RAS, Inst Expt Mineral, Chernogolovka, Moscow District, Russia
RAS, Inst Geol Ore Deposits Petrog Mineral & Geochem, Moscow, Russia
Natl Inst Geophys & Volcanol, Palermo, Italy
RAS, Geol Inst, Pyzhevski 8, Moscow, Russia
Geol Survey Japan, Tsukuba, Ibaraki, Japan
Univ New Mexico, Albuquerque, NM 87131 USA
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