Abstract
Strong, subcontinental mantle-dominated CO2 degassing occurs in the Hartoušov and Bublák mofette fields in the western Eger Rift. The combination of CO2 gas flux and soil gas measurements as well as gravity and geoelectric surveys provides insight into the surface and subsurface of this unique mofette area. CO2 soil gas and gas flux measurements reveal that large amounts of carbon dioxide are released via channels with diameters below 1 m. Carbon dioxide emissions of several tens and up to more than 100 kg day−1 are ejected via these small seeps. Measurements with small spacings are necessary to account for the point like, focused gas discharge in the lesser degassing surrounding. We estimate that between 23 and 97 tons of CO2 are released over an area of about 350,000 m2 each day in the Hartoušov mofette field. The application of widely used geostatistical tools leads to estimations of the CO2 discharge with very high standard deviations due to the strong positive skewness of the data distribution. Geophysical investigations via electrical resistivity tomography and gravity measurements were carried out over areas of strong seepage and reveal distinct anomalies in the subsurface below mofettes, indicating rock and sediment alterations and/or sediment transport by pressurised, ascending CO2 and water mobilised by it. This study reveals that the gas emanations only occur west of a morphological step which is related to a N–S-oriented fault zone, the Počatky-Plesná fault zone. The results of CO2 mapping and the geophysical studies can track the course of this fault zone in this area. Our results fit into a tectonic model in which the mofette fields are in the centres of two independent pull-apart basin-like structures. We hypothesise that the sinistral strike-slip movement of the Počatky-Plesná fault zone leads to a pull-apart basin-like opening, at which the strong, mantle-derived CO2 degassing occurs nowadays. Since the Hartoušov and Bublák mofette fields only illustrate examples along the N–S-striking Počatky-Plesná fault zone, its role and other N–S-striking faults’ roles of the Regensburg–Leipzig–Rostock zone for upper mantle degassing might have been underestimated previously.
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Acknowledgments
We would like to express our gratitude to the German Research Foundation (DFG) for funding this project (KA902/9 and/16 and FL271/13). We thank J. Schumann for his initial hard field work and I. Schüller, S. Kämpf, B. Friedrichs. E. Seidl, M. Seidl and V. Polák for their help in the field during this stage of the project. We want to give warm thanks to N. Wetzig for his language and spelling check. We thank P. Rojik for his help with the interpretation of the drill logs in the Hartoušov area. We also thank the GFZ for financial help for repairing measuring devices. Gravity observations were partly supported by the project CzechGeo/EPOS, Grant No. LM2010008. At last, we like to express our gratitude towards W. H. Geissler, our editor, and Svetlana Byrdina and Domenico Granieri, our reviewers, for their helpful suggestions which improved this article a lot.
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Nickschick, T., Kämpf, H., Flechsig, C. et al. CO2 degassing in the Hartoušov mofette area, western Eger Rift, imaged by CO2 mapping and geoelectrical and gravity surveys. Int J Earth Sci (Geol Rundsch) 104, 2107–2129 (2015). https://doi.org/10.1007/s00531-014-1140-4
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DOI: https://doi.org/10.1007/s00531-014-1140-4