Hydrochemical properties of thermal mineral water sources in the Pasohlávky – Laa an der Thaya region

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00124478" target="_blank" >RIV/00216224:14310/21:00124478 - isvavai.cz</a>

Result on the web

<a href="http://journals.muni.cz/gvms/article/view/15587" target="_blank" >http://journals.muni.cz/gvms/article/view/15587</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5817/GVMS2021-15587" target="_blank" >10.5817/GVMS2021-15587</a>

Result language

čeština

Original language name

Hydrochemické vlastnosti zdrojů termálních minerálních vod v oblasti Pasohlávky – Laa an der Thaya

Original language description

The South Moravian region of Pasohlávky and the Lower Austrian town of Laa an der Thaya belongs to the areas of intensive use of thermal mineral water for recreational and balneological purposes. Thermal mineral water is extracted from a deep-seated Jurassic aquifer, mainly composed of carbonates. These carbonates overlie the crystalline bedrock, which is dipping towards the southeast below the Outer Western Carpathians. Due to this trend, there are two developments of the Jurassic sediments that differ in their lithological composition and are vertically separated by the Musov transition zone. To the northwest from this zone, there is a shallower carbonate development and in the southeast, there is a deeper development which is composed of permeable carbonates together with impermeable marls. The Neogene sediments of Carpathian foredeep are deposited on the top of the Jurassic carbonate structure. Thermal mineral water is exploited by two hydrogeological wells – Muš-3G (Pasohlávky, 1 455 m deep) and Laa Th N1 (Laa an der Thaya, 1 448 m deep) situated in the shallower carbonate part of the Jurassic aquifer. The aim of this study, that summarizes the important partial outputs of the cross-border project Interreg HTPO (Hydrothermal Potential of the Area, ATCZ167), is to specify and clarify the origin, genesis and the processes of water formation based on the hydrochemical evaluation of thermal mineral water. For this purpose, both the final reports of studied wells and especially results from newly performed analyses of stable isotopes of hydrogen δ2H and oxygen δ18O were used. The δ18O and δ2H values of water samples from the Muš-3G well varies from −12,77 ‰ to −12,03 ‰ and from −92,23 ‰ to −88,05 ‰, respectively, while water samples from the Laa Th N1 well are isotopically heavier with δ18O values ranging from −7,04 ‰ to −6,31 ‰ and with δ2H values ranging from −51,04 ‰ to −49,33 ‰. In the Pasohlávky region we suppose it is an isotopically depleted water that has infiltrated in the cold climatic period (glacial). Evaluation of the chemical composition revealed that although the thermal waters from both areas of the hydrogeological structure are of the same Na-Cl type, their total mineralization differs significantly. Lower total mineralization in the Pasohlávky area (approx. 2,2 g/L) is also associated with higher relative concentrations of bicarbonate ions (HCO3−) and atmogenic nitrogen, typically bound to infiltrated meteoric waters. The thermal water in this area is mostly of meteoric origin, mixed with primary marinogenic water. In the Laa an der Thaya region, there is water with higher total mineralization (approx. 11 g/L) and lower relative concentrations of HCO3−, which together with the results of isotope analyses indicates a higher content of primary seawater. The marinogenic origin of waters also confirms the presence of bromides and iodides. The process of mixing primary marine waters with infiltrated meteoric waters significantly contributes to the chemical composition of the studied waters in both areas, while the original marinogenic water type of Na-Cl is preserved.

Czech name

Hydrochemické vlastnosti zdrojů termálních minerálních vod v oblasti Pasohlávky – Laa an der Thaya

Czech description

The South Moravian region of Pasohlávky and the Lower Austrian town of Laa an der Thaya belongs to the areas of intensive use of thermal mineral water for recreational and balneological purposes. Thermal mineral water is extracted from a deep-seated Jurassic aquifer, mainly composed of carbonates. These carbonates overlie the crystalline bedrock, which is dipping towards the southeast below the Outer Western Carpathians. Due to this trend, there are two developments of the Jurassic sediments that differ in their lithological composition and are vertically separated by the Musov transition zone. To the northwest from this zone, there is a shallower carbonate development and in the southeast, there is a deeper development which is composed of permeable carbonates together with impermeable marls. The Neogene sediments of Carpathian foredeep are deposited on the top of the Jurassic carbonate structure. Thermal mineral water is exploited by two hydrogeological wells – Muš-3G (Pasohlávky, 1 455 m deep) and Laa Th N1 (Laa an der Thaya, 1 448 m deep) situated in the shallower carbonate part of the Jurassic aquifer. The aim of this study, that summarizes the important partial outputs of the cross-border project Interreg HTPO (Hydrothermal Potential of the Area, ATCZ167), is to specify and clarify the origin, genesis and the processes of water formation based on the hydrochemical evaluation of thermal mineral water. For this purpose, both the final reports of studied wells and especially results from newly performed analyses of stable isotopes of hydrogen δ2H and oxygen δ18O were used. The δ18O and δ2H values of water samples from the Muš-3G well varies from −12,77 ‰ to −12,03 ‰ and from −92,23 ‰ to −88,05 ‰, respectively, while water samples from the Laa Th N1 well are isotopically heavier with δ18O values ranging from −7,04 ‰ to −6,31 ‰ and with δ2H values ranging from −51,04 ‰ to −49,33 ‰. In the Pasohlávky region we suppose it is an isotopically depleted water that has infiltrated in the cold climatic period (glacial). Evaluation of the chemical composition revealed that although the thermal waters from both areas of the hydrogeological structure are of the same Na-Cl type, their total mineralization differs significantly. Lower total mineralization in the Pasohlávky area (approx. 2,2 g/L) is also associated with higher relative concentrations of bicarbonate ions (HCO3−) and atmogenic nitrogen, typically bound to infiltrated meteoric waters. The thermal water in this area is mostly of meteoric origin, mixed with primary marinogenic water. In the Laa an der Thaya region, there is water with higher total mineralization (approx. 11 g/L) and lower relative concentrations of HCO3−, which together with the results of isotope analyses indicates a higher content of primary seawater. The marinogenic origin of waters also confirms the presence of bromides and iodides. The process of mixing primary marine waters with infiltrated meteoric waters significantly contributes to the chemical composition of the studied waters in both areas, while the original marinogenic water type of Na-Cl is preserved.

Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

—

OECD FORD branch

10503 - Water resources

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geologické výzkumy na Moravě a ve Slezsku

ISSN

1212-6209

e-ISSN

2336-4378

Volume of the periodical

28

Issue of the periodical within the volume

1-2

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

7

Pages from-to

105-111

UT code for WoS article

—

EID of the result in the Scopus database

2-s2.0-85125618846