Confined carbonates – Regional scale hydraulic interaction or isolation?

Mádl-Szőnyi, Judit; Czauner, Brigitta; Iván, Veronika; Tóth, Ádám; Simon, Szilvia; Erőss, Anita; Bodor, Péter; Havril, Tímea; Boncz, László; Sőreg, Viktor

doi:10.1016/j.marpetgeo.2017.06.006

Cited by 25 publications

(27 citation statements)

References 31 publications

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“…The change from the organic to the inorganic precipitate is to be found in the abruptly changing section of physicochemical parameters. The appearance of the reddish-brown biofilm is consistent with the field observations, that biofilms are forming at the mixing of reduced thermal water and oxidative air (Borsodi et al 2012;Erőss et al 2012;Mádl-Szőnyi and Erőss 2013;Mádl-Szőnyi et al 2017a). The reddish-brown colour is the usual colour of biofilms in the BTK, caused by Fe(III), refers to the presence of iron(FeII)-oxidizing bacteria (Anda et al 2014(Anda et al , 2015Borsodi et al 2012).…”

Section: Indirect and Direct Indications And Evidences For Biologicalsupporting

confidence: 84%

“…1a, b). Hydraulic and hydrochemical studies and the radionuclide analysis of the BTK have assisted in the delineation of the flow components of the discharge area (Erhardt et al 2017;Erőss et al 2012;Mádl-Szőnyi et al 2017a, b). In the Gellért Hill area, only thermal springs, originating from regional groundwater flow systems discharge.…”

Section: Gellért Hillmentioning

confidence: 99%

“…The discharging thermal water has elevated concentrations of HCO 3 − , Ca 2+ , Mg 2+ and SO 4 2− (Erőss 2010; Kovács and Erőss 2017). The basinal fluids, on the other hand, are responsible for the Na + , Cl − , Ra 2+ , CO 2 , H 2 S, H 2 SiO 3 and trace element content of the discharging water (Mádl-Szőnyi and Tóth 2015;Mádl-Szőnyi et al 2017a) (Fig. 2).…”

Section: Gellért Hillmentioning

confidence: 99%

“…Conceptual hydrogeological model of the Gellért Hill discharge area (Erőss 2010 modified byMádl- Szőnyi et al 2017a) …”

mentioning

confidence: 99%

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Integration of In Situ Experiments and Numerical Simulations to Reveal the Physicochemical Circumstances of Organic and Inorganic Precipitation at a Thermal Spring

et al. 2018

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Organic and inorganic precipitates are both characteristic in the active hypogenic karst area of Buda Thermal Karst in Hungary. As an active system, it is a good natural laboratory to study ongoing precipitation processes. Because of anthropogenic influence and the complexity of spring environments, it is challenging to reveal all the governing factors in the process of precipitation. In situ experiments, i.e. artificially controlled natural systems simplify the complexity by adding, excluding or stabilizing influencing parameters during the experiment. CO 2 degassing drives changes in the physicochemical parameters of spring waters from the discharge along their flow path. The rate and spatial extension of these changes depend on local hydrogeological, geological, climatic, topographical etc. factors, affecting precipitation processes. In this study, two one-day-long in situ experiments were executed to examine the physicochemical parameter changes of thermal water in a tunnel. The integration of the results with reactive transport models revealed the physicochemical processes of ingassing and degassing and predicted CaCO 3 precipitation along the flow path. Small-scale roughness of the channel surface seemed to further influence pH and concentration of HCO 3 −. After 6 weeks of thermal water flowing, organic precipitate (biofilm) formed close to the discharge and then, with a sharp change, inorganic precipitate (calcite) dominates a bit further from the discharge. In situ experiments and connected numerical simulations revealed the role of CO 2 degassing and calcite precipitation in the changes of physicochemical parameters, but organic precipitates also have to be considered near the discharge.

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Section: Indirect and Direct Indications And Evidences For Biologicalsupporting

confidence: 84%

Section: Gellért Hillmentioning

confidence: 99%

Section: Gellért Hillmentioning

confidence: 99%

“…Conceptual hydrogeological model of the Gellért Hill discharge area (Erőss 2010 modified byMádl- Szőnyi et al 2017a) …”

mentioning

confidence: 99%

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Integration of In Situ Experiments and Numerical Simulations to Reveal the Physicochemical Circumstances of Organic and Inorganic Precipitation at a Thermal Spring

et al. 2018

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“…During the interpretation of fluid potential anomalies, the effect of hydrostratigraphy or geology (permeability) can be directly concluded. This approach and the hydraulic analysis of preproduction archival measured data were first applied in the area by the present study; however, there are similar studies in marginal carbonate and sedimentary basin regions of Hungary where this approach helped in the evaluation of resources and phenomena (Czauner and Mádl-Szőnyi 2013;Erhardt et al 2017;Mádl-Szőnyi et al 2018;Mádl-Szőnyi et al 2019).…”

Section: Introductionmentioning

confidence: 79%

Characterization of the regional groundwater flow systems in south Transdanubia (Hungary) to understand karst evolution and development of hydrocarbon and geothermal resources

Csondor

Czauner

Csobaji³

et al. 2020

Hydrogeol J

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In South Transdanubia (Hungary), the remarkable geothermal and hydrocarbon resources in the Drava Basin and the hypogene caves at the margin of outcropping carbonate hills were usually investigated separately and their interactions were hitherto neglected. The aim of this study is to give all these groundwater-related resources and phenomena a common framework applying the concept of regional hydraulic continuity, and to complete the regional (i.e., basin-scale) hydraulic assessment of the area based on preproduction archival measured data. Pressure-elevation profiles, tomographic fluid-potential maps and hydraulic cross-sections were constructed to determine the vertical and horizontal fluid-flow conditions. As a result, two kinds of fluid flow systems could be identified. Within the gravitational flow systems, horizontal flow conditions are dominant and the regional flow direction tends toward the S-SE. In deeper basin regions, an overpressured flow system is prevalent, where fluids are driven laterally from the deeper sub-basins towards their margins. Based on the regional-scale evaluation of fluid flow systems, conclusions could be drawn regarding the geothermal and hydrocarbon potential of the area. Additionally, local-scale phenomena could be explained, particularly in the southern foreland of the Villány Hills. Cave formation cannot be related to the present-day flow systems here. In the Harkány area, groundwater chemistry could be explained by fluid contribution from the Drava Basin. A comparison with the marginal Buda Thermal Karst area allows for generalized conclusions regarding the connections between marginal karst reservoirs and the Pannonian Basin.

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