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Title: Altersbestimmung an thermalen Tiefenwässern im Oberjura des Molassebeckens mittels Krypton-Isotopen

Abstract

81Kr (half-life 229,000 years) is an ideal tracer for old groundwater. The Upper Jurassic rock in the deep Molasse Basin is an outstanding geothermal groundwater reservoir (with temperatures up to 140 °C). However, due to the complex groundwater evolution (ion and isotope exchange, gas flux, etc.), comprehensive hydrogeological studies completed to date, including 14C–DIC and He isotopes, could not resolve the recharge dynamics and residence times. Nine geothermal wells were therefore sampled for 81Kr/ 85Kr employing the laser-based atom trap tracer analysis technique (ATTA). In the western and central basin, the results reveal predominant groundwater recharge during the last glacial period with one sample influenced by infiltration during the earlier glacial period. Recharge signatures and 81Kr-model-ages fit very well to subglacial recharge with cross-formational flow through the sedimentary cover (600 to >3000 m deep). In the eastern basin, the results point to the Cromerian complex, indicating a slower flow system with less influence from recharge during glacial periods.

Authors:
 [1];  [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6]
  1. Hydroisotop GmbH, Schweitenkirchen (Deutschland)
  2. Univ. of Bern, Bern (Schweiz)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Abt. 9 – Landesamt f. Geologie (Deutschland)
  5. Bayerisches Landesamt für Umwelt, Augsburg (Deutschland)
  6. Montanuniversität, Leoben (Osterreich)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Hydroisotop GmbH
OSTI Identifier:
1580732
Grant/Contract Number:  
[AC02-06CH11357]
Resource Type:
Accepted Manuscript
Journal Name:
Grundwasser
Additional Journal Information:
[ Journal Volume: 24; Journal Issue: 4]; Journal ID: ISSN 1430-483X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 81Kr; 85Kr; ATTA; Molasse basin; cross-formational flow; dating; isotope; krypton; old groundwater; recharge

Citation Formats

Heidinger, Michael, Eichinger, Florian, Purtschert, Roland, Mueller, Peter, Zappala, Jake, Wirsing, Gunther, Geyer, Tobias, Fritzer, Thomas, and Groß, Doris. Altersbestimmung an thermalen Tiefenwässern im Oberjura des Molassebeckens mittels Krypton-Isotopen. United States: N. p., 2019. Web. doi:10.1007/s00767-019-00431-0.
Heidinger, Michael, Eichinger, Florian, Purtschert, Roland, Mueller, Peter, Zappala, Jake, Wirsing, Gunther, Geyer, Tobias, Fritzer, Thomas, & Groß, Doris. Altersbestimmung an thermalen Tiefenwässern im Oberjura des Molassebeckens mittels Krypton-Isotopen. United States. doi:10.1007/s00767-019-00431-0.
Heidinger, Michael, Eichinger, Florian, Purtschert, Roland, Mueller, Peter, Zappala, Jake, Wirsing, Gunther, Geyer, Tobias, Fritzer, Thomas, and Groß, Doris. Wed . "Altersbestimmung an thermalen Tiefenwässern im Oberjura des Molassebeckens mittels Krypton-Isotopen". United States. doi:10.1007/s00767-019-00431-0.
@article{osti_1580732,
title = {Altersbestimmung an thermalen Tiefenwässern im Oberjura des Molassebeckens mittels Krypton-Isotopen},
author = {Heidinger, Michael and Eichinger, Florian and Purtschert, Roland and Mueller, Peter and Zappala, Jake and Wirsing, Gunther and Geyer, Tobias and Fritzer, Thomas and Groß, Doris},
abstractNote = {81Kr (half-life 229,000 years) is an ideal tracer for old groundwater. The Upper Jurassic rock in the deep Molasse Basin is an outstanding geothermal groundwater reservoir (with temperatures up to 140 °C). However, due to the complex groundwater evolution (ion and isotope exchange, gas flux, etc.), comprehensive hydrogeological studies completed to date, including 14C–DIC and He isotopes, could not resolve the recharge dynamics and residence times. Nine geothermal wells were therefore sampled for 81Kr/85Kr employing the laser-based atom trap tracer analysis technique (ATTA). In the western and central basin, the results reveal predominant groundwater recharge during the last glacial period with one sample influenced by infiltration during the earlier glacial period. Recharge signatures and 81Kr-model-ages fit very well to subglacial recharge with cross-formational flow through the sedimentary cover (600 to >3000 m deep). In the eastern basin, the results point to the Cromerian complex, indicating a slower flow system with less influence from recharge during glacial periods.},
doi = {10.1007/s00767-019-00431-0},
journal = {Grundwasser},
number = [4],
volume = [24],
place = {United States},
year = {2019},
month = {9}
}

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Works referenced in this record:

Tracer applications of noble gas radionuclides in the geosciences
journal, November 2014


Setting a limit on anthropogenic sources of atmospheric 81Kr through Atom Trap Trace Analysis
journal, March 2017