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Fumarolic gases at Mombacho volcano (Nicaragua): presence of magmatic gas species and implications for volcanic surveillance

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Abstract

Mombacho is a deeply dissected volcano belonging to the Quaternary volcanic chain of Nicaragua. The southern, historic collapse crater (El Crater) currently hosts a fumarolic field with a maximum temperature of 121°C. Chemical and isotopic data from five gas-sampling field campaigns carried out in 2002, 2003 and 2005 highlight the presence of high-temperature gas components (e.g. SO2, HCl and HF), which indicate a significant contribution of juvenile magmatic fluids to the hydrothermal system feeding the gas discharges. This is strongly supported by the mantle-derived helium and carbon isotopic signatures, although the latter is partly masked by either a sedimentary subduction-related or a shallow carbonate component. The observed chemical and isotopic composition of the Mombacho fluids seems to indicate that this volcanic system, although it has not experienced eruptive events during the last centuries, can be considered active and possibly dangerous, in agreement with the geophysical data recorded in the region. Systematic geochemical monitoring of the fumarolic gas discharges, coupled with a seismic and ground deformation network, is highly recommended in order to monitor a possible new eruptive phase.

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Acknowledgements

We thank Pedro Perez, Eliecer Duarte and Angelo Minissale for their help during the fieldwork and Orlando, Guillermo and Felix for the nice drive through the coffee plantations and the wild forests of Mombacho. Further thanks to Graziella Devoli and Antonio Alvarez for providing important bibliography and information on Mombacho volcano. Thanks to Lars Rüpke for the helpful advice provided to the first author during the preparation of the manuscript.

W.C. Evans, T.P. Fischer, B. van Wyk de Vries, M. Edmonds, an anonymous reviewer and J. Donnelly-Nolan are warmly thanked for providing useful suggestions, comments and advice.

This work was supported by the DFG as part of the SFB 574 “Volatiles and Fluids in Subduction Zones” at Kiel University (Germany) and by the Volkswagen Foundation (I/76 590). This publication is contribution no. 82 of the Sonderforschungsbereich SFB 574.

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Correspondence to K. Garofalo.

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Garofalo, K., Tassi, F., Vaselli, O. et al. Fumarolic gases at Mombacho volcano (Nicaragua): presence of magmatic gas species and implications for volcanic surveillance. Bull Volcanol 69, 785–795 (2007). https://doi.org/10.1007/s00445-006-0108-z

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