Auswirkungen der Fassungssanierung der Wettinquelle, Bad Brambach, auf die Altersstruktur des Mineralwassers

Koch, Ulrich; Hebert, D.; Voßberg, Manuela; Heinicke, J.

doi:10.1007/s00767-005-0081-z

Cited by 6 publications

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“…The water reaches the surface along fractures and fissures. The high CO 2 (2645 ± 203 mg/L) and HCO 3 − concentrations (813 ± 57 mg/L) [ Bräuer et al, ] allow carbonic acid to readily react with the rock during transport along fractures, dissolving minerals, therefore leading to the highly mineralized spring waters (total dissolved solids (TDS) up to 1.4 g/L) [ Koch et al, ; Koch and Heinicke , ].…”

Section: Discussionsupporting

confidence: 92%

“…However, the measured negative δ 56 Fe values do not always coincide with high discharge. Also, low discharge samples do not always have the most positive δ 56 Fe values, as would be expected from a simple mixing process of deep water (low Q and δ 56 Fe and high λ and TDS) with near‐surface water (high Q and δ 56 Fe and low λ and TDS) [ Koch et al, ; Koch and Heinicke , ]. We modeled the temporal change in δ 56 Fe in a binary mixing model of deep water with surface water constrained by the measured Fe concentrations and isotopic compositions and hydrological mixing parameters from Koch et al [].…”

Section: Discussionmentioning

confidence: 99%

“…The deep aquifer of the Wettinquelle mineral spring is situated in the fissured Fichtelgebirge/Smrčiny granite [ Hecht et al, ]. The water reaches the surface along fractures and faults (Figure ) [ Koch et al, ]. Previous studies reported on the gas composition and methane δ 13 C values from a weekly sampling campaign at the Wettinquelle mineral spring between 2000 and 2003 covering the more than 3 month long earthquake swarm period in 2000.…”

Section: Field Site and Methodsmentioning

confidence: 99%

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Earthquake impact on iron isotope signatures recorded in mineral spring water

Schuessler

Kämpf

Koch³

et al. 2016

JGR Solid Earth

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We investigated the iron isotope signatures of dissolved Fe in the water of the Wettinquelle mineral spring (Bad Brambach, Germany) by time series sampling covering seismically active periods related to tectonic activity near the Eger Rift system in central Europe. Our objective was to test whether Fe isotopes trace earthquake‐induced abiotic and biotic changes in the fluid/rock interaction of the deep, fissured, granitic aquifer. We found that the dissolved Fe isotope signatures in spring water are distinct from the granitic source signature (δ56Fe = +0.09‰). Particularly, we discovered that water δ56Fe values are remarkably stable (−0.01 ± 0.11‰, 2SD, n = 4) before and during a strong seismic swarm period in 2000 (local magnitudes ML > 3), while O2 and H2 concentrations in water decrease and dissolved Fe content increases. Later, recurring events of lower δ56Fe values down to −0.3‰ are observed in the period from 2001 to 2003 with intermittent seismic events (1 < ML < 3.2). The observations indicate a time lag between tectonic forcing and Fe isotope response. The role of abiotic fluid/rock interaction and Fe‐utilizing bacteria identified in the mineral spring water on Fe isotope fractionation is discussed. We explain recurring changes toward isotopically lighter values by a combination of Fe dissolution from deep granite and admixture of isotopically light Fe generated by a complex combination of abiotic and biotic processes operating in the aquifer when disturbed by swarm earthquakes events. We propose a conceptual model scenario of earthquake‐triggered changes in biogeochemical processes.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Field Site and Methodsmentioning

confidence: 99%

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Earthquake impact on iron isotope signatures recorded in mineral spring water

Schuessler

Kämpf

Koch³

et al. 2016

JGR Solid Earth

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“…Mean values of gas and water characteristics of the Wettinquelle, Bad Brambach, as observed before the seismically active period lasting from the end of August to the end of December 2000, are given in Table 1. According to our original plans the second monitoring campaign of the gas and isotope composition at Bad Brambach should have been carried out at the Eisenquelle again [ Weise et al , 2001; Bräuer et al , 2003], but because of the upcoming reconstruction of that spring we moved the sampling to the Wettinquelle where the reconstruction was already finished [ Koch et al , 2005]. The data of Table 1 demonstrate that the fluid signature of both mineral springs is similar.…”

Section: Resultsmentioning

confidence: 99%

“…The oxygen concentration is always lower than expected for dissolved air, which means that most of the oxygen has been consumed during circulation through the granite. On the other hand, variations of the oxygen concentrations were observed, which may indicate that the Wettinquelle is sensitive to hydraulic pressure fluctuations in the aquifer [ Koch et al , 2005]. Therefore, and because Ar and Ne isotope data that would allow distinguishing between dissolved and excess air portions were studied for selected samples only, the gas composition could not be corrected for air contributions.…”

Section: Resultsmentioning

confidence: 99%

Seismically induced changes of the fluid signature detected by a multi‐isotope approach (He, CO₂, CH₄, N₂) at the Wettinquelle, Bad Brambach (central Europe)

et al. 2007

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We present a study considering the systematics of gas and isotope compositions (3He/4He, δ13CCO2, δ13CCH4, δ15N) of a permanent magmatic CO2 flux in the hydrothermal system of the spring “Wettinquelle” in Bad Brambach and their relation to the seismic activity beneath the western Eger rift. The gas and isotope compositions were monitored for more than 3 years. The time series includes periods before, during, and after a 4‐month‐long seismically active period from the end of August to the end of December 2000. Shifts due to admixture of crustal components were found for all monitored isotope ratios during and after the seismically active period. In case of helium and nitrogen, isotopic anomalies occurred already about 6 weeks before the beginning of the seismically active period, contemporaneous with a water level anomaly of the well VL4 near the Wettinquelle. On the one hand, preseismic deformations may be responsible for the observed isotope anomalies; on the other hand, coseismic fracturing processes in the surroundings of the hypocenters may play a role. Both effects produce greater permeability and result in the release of crustal fluids. The migration and admixture of these crustal components to the “permanent” upper mantle‐derived fluid flux result in geochemical anomalies that persist for more than 2 years. The results of the detailed isotope monitoring have proven to be an important contribution to understand the geodynamic processes that may presently be going on in the region Vogtland/NW Bohemia.

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Seismically triggered anomalies in the isotope signatures of mantle‐derived gases detected at degassing sites along two neighboring faults in NW Bohemia, central Europe

2014

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Auswirkungen der Fassungssanierung der Wettinquelle, Bad Brambach, auf die Altersstruktur des Mineralwassers

Cited by 6 publications

References 4 publications

Earthquake impact on iron isotope signatures recorded in mineral spring water

Earthquake impact on iron isotope signatures recorded in mineral spring water

Seismically induced changes of the fluid signature detected by a multi‐isotope approach (He, CO₂, CH₄, N₂) at the Wettinquelle, Bad Brambach (central Europe)

Seismically triggered anomalies in the isotope signatures of mantle‐derived gases detected at degassing sites along two neighboring faults in NW Bohemia, central Europe

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Auswirkungen der Fassungssanierung der Wettinquelle, Bad Brambach, auf die Altersstruktur des Mineralwassers

Cited by 6 publications

References 4 publications

Earthquake impact on iron isotope signatures recorded in mineral spring water

Earthquake impact on iron isotope signatures recorded in mineral spring water

Seismically induced changes of the fluid signature detected by a multi‐isotope approach (He, CO2, CH4, N2) at the Wettinquelle, Bad Brambach (central Europe)

Seismically triggered anomalies in the isotope signatures of mantle‐derived gases detected at degassing sites along two neighboring faults in NW Bohemia, central Europe

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Seismically induced changes of the fluid signature detected by a multi‐isotope approach (He, CO₂, CH₄, N₂) at the Wettinquelle, Bad Brambach (central Europe)