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Article

87Sr/86Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water

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Geotop & Département des Sciences de la Terre et de l’Atmosphère, Université du Québec à Montréal, Montreal, QC H3C 3P8, Canada
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Department of Geology and Geoenviromment, National & Kapodistrian University of Athens, Panepistimiopolis, 10679 Athens, Greece
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Geotop & Department of Earth and Planetary Sciences, McGill University, Montreal, QC H3A 0G4, Canada
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Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109-1005, USA
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ISOR Iceland GeoSurvey, Urðarhvarf 8, 203 Kopavogur, Iceland
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Landsvirkjun, Háaleitisbraut 68, 103 Reykjavik, Iceland
*
Author to whom correspondence should be addressed.
Academic Editors: Giovanni Vespasiano, Massimiliano Vardè, Carmine Apollaro and Jesus Martinez-Frias
Geosciences 2022, 12(3), 119; https://doi.org/10.3390/geosciences12030119
Received: 8 February 2022 / Revised: 24 February 2022 / Accepted: 1 March 2022 / Published: 4 March 2022
The determination of the current and past recharge sources, as well as the reconstruction of the timing of the recharge in geothermal reservoirs, is required in order to correctly assess the resource potential of these systems. Theistareykir is a newly developed geothermal field close to the well-known exploited fields of Krafla and Námafjall in NE Iceland. In this study, the 87Sr/86Sr ratios measured in deep geothermal fluids are presented and, together with the Cl and noble gas signatures, are used to place constraints on the fluid sources. The Cl/Sr and 87Sr/86Sr ratios show a peculiar and unique composition among Icelandic geothermal fluids. The 87Sr/86Sr ratios range from 0.70355 to 0.70671, suggesting the presence of a significant seawater component—possibly marine aerosols added to rain or snowfall—as well as an additional source of Sr leached from local basalts. Moreover, a correlation between the atmospheric noble gas (ANGs) elemental ratios Ne/Ar, Kr/Ar and Xe/Ar, and the 87Sr/86Sr ratios is observed. The latter results from the mixing of meteoric water with Sr leached from local basalts, meteoric water containing unrelated Sr from seawater, and recharge water with ANGs derived from trapped air bubbles in snow. We suggest that the combined ANGs and Sr seawater signatures are representative of a glacial water source derived from the melting of compacting snow. View Full-Text
Keywords: 87Sr/86Sr; atmospheric noble gases; geothermal fluids; seawater; glacial water; Theistareykir; Iceland 87Sr/86Sr; atmospheric noble gases; geothermal fluids; seawater; glacial water; Theistareykir; Iceland
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MDPI and ACS Style

Pinti, D.L.; Haut-Labourdette, M.; Poirier, A.; Saby, M.; van Hinsberg, V.J.; Berlo, K.; Castro, M.C.; Gautason, B.; Sigurðardóttir, Á.K. 87Sr/86Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water. Geosciences 2022, 12, 119. https://doi.org/10.3390/geosciences12030119

AMA Style

Pinti DL, Haut-Labourdette M, Poirier A, Saby M, van Hinsberg VJ, Berlo K, Castro MC, Gautason B, Sigurðardóttir ÁK. 87Sr/86Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water. Geosciences. 2022; 12(3):119. https://doi.org/10.3390/geosciences12030119

Chicago/Turabian Style

Pinti, Daniele L., Marie Haut-Labourdette, André Poirier, Marion Saby, Vincent J. van Hinsberg, Kim Berlo, Maria C. Castro, Bjarni Gautason, and Ásgerður K. Sigurðardóttir. 2022. "87Sr/86Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water" Geosciences 12, no. 3: 119. https://doi.org/10.3390/geosciences12030119

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