CO2 and He degassing at El Chichón volcano, Chiapas, Mexico: gas flux, origin and relationship with local and regional tectonics

• Published in: Bulletin of Volcanology
• Main Authors: Mazot, A., Rouwet, D., Taran, Y., Inguaggiato, S., Varley, N.
• Other Authors: Mazot, A.; Instituto de Geofisica UNAm Mexico City Mexico, Rouwet, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia, Taran, Y.; Instituto de Geofisica UNAM Mexico City Mexico, Inguaggiato, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia, Varley, N.; Universidad de Colima, Colima Mexico, Instituto de Geofisica UNAm Mexico City Mexico, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia, Instituto de Geofisica UNAM Mexico City Mexico, #PLACEHOLDER_PARENT_METADATA_VALUE#
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer 2011
• Subjects: El Chichon; CO2 soil flux; Crater Lake; Gas geochemistry; He-C isotopes; Fumarolic and bubbling gases; Tectonics; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys; measurements; and monitoring; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring; 05. General::05.02. Data dissemination::05.02.01. Geochemical data; Arctic
• Online Access: http://hdl.handle.net/2122/7115; https://doi.org/10.1007/s00445-010-0443-y

During 2007–2008, three CO2 flux surveys were performed on El Chichón volcanic lake, Chiapas, Mexico, with an additional survey in April 2008 covering the entire crater floor (including the lake). The mean CO2 flux calculated by sequential Gaussian simulation from the lake was 1,190 (March 2007), 730 (December 2007) and 1,134 g m−2 day−1 (April 2008) with total emission rates of 164±9.5 (March 2007), 59±2.5 (December 2007) and 109±6.6 t day−1 (April 2008). The mean CO2 flux estimated from the entire crater floor area was 1,102 g m−2 day−1 for April 2008 with a total emission rate of 144±5.9 t day−1. Significant change in CO2 flux was not detected during the period of survey, and the mapping of the CO2 flux highlighted lineaments reflecting the main local and regional tectonic patterns. The 3He/4He ratio (as high as 8.1 RA) for gases in the El Chichón crater is generally higher than those observed at the neighbouring Transmexican Volcanic Belt and the Central American Volcanic Arc. The CO2/3He ratios for the high 3He/4He gases tend to have the MORB-like values (1.41×109), and the CO2/3He ratios for the lower 3He/4He gases fall within the range for the arc-type gases. The high 3He/4He ratios, the MORB-like CO2/3He ratios for the high 3He/4He gases and high proportion of MORB-CO2 (M=25 ±15%) at El Chichón indicate a greater depth for the generation of magma when compared to typical arc volcanoes. Published 423-441 2.4. TTC - Laboratori di geochimica dei fluidi JCR Journal reserved