Volcanic gas emissions and degassing dynamics at Ubinas and Sabancaya volcanoes; implications for the volatile budget of the central volcanic zone

Alessandro Aiuppa, Philipson Bani, Giancarlo Tamburello, Gaetano Giudice, Marie Boichu, C. Ian Schipper, Nial Peters, Talfan Barnie, Manuel Moussallam, Aaron Curtis, Yves Moussallam, Pablo Masias, Sophie Bauduin, Fredy Apaza, Alessandro Aiuppa

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Abstract

Emission of volcanic gas is thought to be the dominant process by which volatiles transit from the deep earth to the atmosphere. Volcanic gas emissions, remain poorly constrained, and volcanoes of Peru are entirely absent from the current global dataset. In Peru, Sabancaya and Ubinas volcanoes are by far the largest sources of volcanic gas. Here, we report the first measurements of the compositions and fluxes of volcanic gases emitted from these volcanoes. The measurements were acquired in November 2015. We determined an average SO2flux of 15.3 ± 2.3 kg sâ 1(1325-ton dayâ 1) at Sabancaya and of 11.4 ± 3.9 kg sâ 1(988-ton dayâ 1) at Ubinas using scanning ultraviolet spectroscopy and dual UV camera systems. In-situ Multi-GAS analyses yield molar proportions of H2O, CO2, SO2, H2S and H2gases of 73, 15, 10 1.15 and 0.15 mol% at Sabancaya and of 96, 2.2, 1.2 and 0.05 mol% for H2O, CO2, SO2and H2S at Ubinas. Together, these data imply cumulative fluxes for both volcanoes of 282, 30, 27, 1.2 and 0.01 kg sâ 1of H2O, CO2, SO2, H2S and H2respectively. Sabancaya and Ubinas volcanoes together contribute about 60% of the total CO2emissions from the Central Volcanic zone, and dominate by far the total revised volatile budget of the entire Central Volcanic Zone of the Andes.
Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalJournal of Volcanology and Geothermal Research
Volume343
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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    Aiuppa, A., Bani, P., Tamburello, G., Giudice, G., Boichu, M., Schipper, C. I., Peters, N., Barnie, T., Moussallam, M., Curtis, A., Moussallam, Y., Masias, P., Bauduin, S., Apaza, F., & Aiuppa, A. (2017). Volcanic gas emissions and degassing dynamics at Ubinas and Sabancaya volcanoes; implications for the volatile budget of the central volcanic zone. Journal of Volcanology and Geothermal Research, 343, 181-191.