Degassing Regime of Hekla Volcano 2012€“2013
Available online at www.sciencedirect.com ScienceDirect Geochimica et Cosmochimica Acta 159 (2015) 80–99 www.elsevier.com/locate/gca Degassing regime of Hekla volcano 2012–2013 Evgenia Ilyinskaya a,b,⇑, Alessandro Aiuppa c,d, Baldur Bergsson b, Rossella Di Napoli c, Thra´inn Fridriksson e, Audur Agla O´ lado´ttir e, Finnbogi O´ skarsson e, Fausto Grassa d, Melissa Pfeffer b, Katharina Lechner b, Richard Yeo b, Gaetano Giudice d a British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, United Kingdom b Icelandic Meteorological Office, Bustadavegi 7-9, 150 Reykjavik, Iceland c DiSTeM, Universita` di Palermo, Palermo, Italy d Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, 90146 Palermo, Italy e Iceland GeoSurvey, Grensasvegi 9, 108 Reykjavik, Iceland Received 24 February 2014; accepted in revised form 9 January 2015; available online 17 February 2015 Abstract Hekla is a frequently active volcano with an infamously short pre-eruptive warning period. Our project contributes to the ongoing work on improving Hekla’s monitoring and early warning systems. In 2012 we began monitoring gas release at Hekla. The dataset comprises semi-permanent near-real time measurements with a MultiGAS system, quantification of diffuse gas flux, and direct samples analysed for composition and isotopes (d13C, dD and d18O). In addition, we used reaction path modelling to derive information on the origin and reaction pathways of the gas emissions. 13 Hekla’s quiescent gas composition was CO2-dominated (0.8 mol fraction) and the d C signature was consistent with pub- lished values for Icelandic magmas. The gas is poor in H2O and S compared to hydrothermal manifestations and syn-eruptive emissions from other active volcanic systems in Iceland.
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