EGU2020-849, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-849
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Real time and in-situ analysis of the gas-emissions of the Eastern Carpathians: results and perspectives

Roland Szalay1, Boglárka-Mercédesz Kis1,2,3, Szabolcs Harangi2, László Palcsu3, Marcello Bitetto4, Alessandro Aiuppa4, and Zoltán Imecs5
Roland Szalay et al.
  • 1Babes-Bolyai, Biology and Geology, of Geology, Cluj-Napoca, Romania (szalay.j.roland@gmail.com, kis.boglarka@ubbcluj.ro)
  • 2MTA-ELTE Volcanology Research Group, Eötvös University, Budapest, Hungary (kis.boglarka@ubbcluj.ro, szabolcs.harangi@geology.elte.hu)
  • 3Isotope Climatology and Environmental Research Centre (ICER), Hungarian Academy of Sciences (ATOMKI), Debrecen, Hungary (kis.boglarka@ubbcluj.ro, palcsu.laszlo@atomki.mta.hu)
  • 4DiSTeM Department, University of Palermo, Palermo, Italy (alessandro.aiuppa@unipa.it, marcellobitetto@gmail.com)
  • 5Babes-Bolyai, Hungarian Department of geography, Cluj-Napoca, Romania (zoltan.imecs@ubbcluj.ro)

The Carpathian-Pannonian region was dominated by diverse volcanic activity for the last 20 million years, and even 1 million years ago there was precedent for active zones.  Although volcanic eruptions are very uncommon in the region today, however the frequent earthquakes in the Carpathian-bend, the numerous appearance and intense manifestation of gas-emissions in the southeastern areas of the region and many petrochemical and geochemical volcanologic studies as well, indicate that the area is likely not completely inactive. The gas emissions investigated by us may be directly related to these geodynamic processes [1].

In Romania, the Eastern Carpathian Neogene-Quaternary volcanic chain and it’s neighbouring zones contain most of the carbon dioxide rich gas emissions, which also occur in the form of natural mofettes, bubbling pools and springs. They can appear in frequently populated settlements more often in cellars, which puts the inhabitants in direct danger due the lack of information in the public knowledge.

The motivation of our work is to gather real time and in-situ information with the help of Multi-Gas instrument about the composition of the gas-emissions across the Eastern Carpathians and to create a high resolution geological map from the measured sites in the mentioned area above. Furthermore, we would like to clarify if there is any relation between the tectonic characteristics of the study area and the manifestation, concentration of gas-emissions.

In total, 205 gas emissions were investigated for their CO2 (0-100%), CH4 (0-7%) and H2S (0-200 ppm) concentrations. The composition of the different gas-species varied according to the geological context. The CO2 concentrations varied between 0.96 and 98.08 %. The highest values were measured in the the Quaternary volcanic area of Ciomad, and also in the neighbouring thrusted and folded area of the Carpathian Flysch which suggests a tectonic control over the appearance of the gas emissions.

The CH4 concentrations ranged between 0.21 and 6.76% and were higher at hydrocarbon-prone areas, such as the sedimentary deposits of the Transylvanian Basin and Carpathian Flysch. In these cases the CO2 concentrations were low (up to 4.6%).

The H2S concentrations varied between 0.21 and 200 ppm, according to our knowledge, these are the first H2S in-situ measurements in the gas emissions of the study area. The concentrations of H2S were higher at the volcanic area of Ciomad, reaching values above the detection limit (~200 ppm) which are related to volcanic degassing.

In conclusion, based on the investigated sites, there is a spatial correlation between the appearance of mineral water springs, gas emissions on surface and the neighbouring tectonic structures. The Multi-Gas proved to be a useful tool in the in-situ investigation of gas emissions of the Eastern Carpathians, being efficient especially for the measurement of the H2S concentrations that are very sensitive for oxidation processes.

Bibliography:

1.Kis B.M., Caracusi, A., Palcsu, L., Baciu, C., Ionescu, A., Futó, I., Sciarra, A., Harangi, Sz., Noble Gas and Carbon Isotope Systematics at the Seemingly Inactive Ciomadul Volcano (Eastern‐Central Europe, Romania): Evidence for Volcanic Degassing, Geochemistry, Geophysics, Geosystems, vol.20, issue 6, 2019, 3019-3043.

How to cite: Szalay, R., Kis, B.-M., Harangi, S., Palcsu, L., Bitetto, M., Aiuppa, A., and Imecs, Z.: Real time and in-situ analysis of the gas-emissions of the Eastern Carpathians: results and perspectives, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-849, https://doi.org/10.5194/egusphere-egu2020-849, 2019

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  • CC1: Comment on EGU2020-849, Deirdre Mallyon, 15 May 2020

    My colleagues and I love your presentation. It's a really interesting study, and we appreciate the humor, well done!

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