1. Volcanic Gas Emissions Along the Colombian Arc Segment of the Northern Volcanic Zone (CAS-NVZ): Implications for volcano monitoring and volatile budget of the Andean Volcanic Belt
- Author
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L. Meza, C. Lopez, Zoraida Chacón, Marco Liuzzo, J. Lages, Marcello Bitetto, Santiago Arellano, Viviana Burbano, Gaetano Giudice, Alessandro Aiuppa, Lages J., Chacon Z., Burbano V., Meza L., Arellano S., Liuzzo M., Giudice G., Aiuppa A., Bitetto M., and Lopez C.
- Subjects
geography ,Colombian Arc Segment ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Mantle wedge ,Subduction ,Galera ,Volcanic belt ,Geochemistry ,Sediment ,arc volcanism ,Nevado del Ruiz ,010502 geochemistry & geophysics ,01 natural sciences ,Plume ,Arc (geometry) ,Geophysics ,Volcano ,Geochemistry and Petrology ,Subaerial ,volatile fluxes ,Geology ,Purace ,0105 earth and related environmental sciences - Abstract
Studying spatial and temporal trends in volcanic gas compositions and fluxes is crucial both to volcano monitoring and to constrain the origin and recycling efficiency of volatiles at active convergent margins. New volcanic gas compositions and volatile fluxes are here reported for Nevado del Ruiz, Galeras, and Purace, three of the most persistently degassing volcanoes located in the Colombian Arc Segment of the Northern Volcanic Zone. At Nevado del Ruiz, from 2014 to 2017, plume emissions showed an average molar CO2/S-T ratio of 3.9 +/- 1.6 (S-T is total sulfur, S). Contemporary, fumarolic chemistry at Galeras progressively shifted toward low-temperature, S-depleted fumarolic gas discharges with an average CO2/S-T ratio in excess of 10 (6.0-46.0, 2014-2017). This shift in volcanic gas compositions was accompanied by a concurrent decrease in SO2 emissions, confirmed on 21 March 2017 by high-resolution ultraviolet camera-based SO2 fluxes of similar to 2.5 kg/s (similar to 213 t/day). For comparison, SO2 emissions remained high at Nevado del Ruiz (weighted average of 8 kg/s) between 2014 and 2017, while Purace maintained rather low emission levels (
- Published
- 2019