87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water
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-kn...
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ftdoajarticles:oai:doaj.org/article:4b9fcdd9966d4406bf89cb61368d34ba 2023-05-15T16:51:27+02:00 87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water Daniele Luigi Pinti Marie Haut-Labourdette André Poirier Marion Saby Vincent J. van Hinsberg Kim Berlo Maria Clara Castro Bjarni Gautason Ásgerður K. Sigurðardóttir 2022-03-01T00:00:00Z https://doi.org/10.3390/geosciences12030119 https://doaj.org/article/4b9fcdd9966d4406bf89cb61368d34ba EN eng MDPI AG https://www.mdpi.com/2076-3263/12/3/119 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences12030119 2076-3263 https://doaj.org/article/4b9fcdd9966d4406bf89cb61368d34ba Geosciences, Vol 12, Iss 119, p 119 (2022) 87 Sr/ 86 Sr atmospheric noble gases geothermal fluids seawater glacial water Theistareykir Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.3390/geosciences12030119 2022-12-31T08:25:26Z 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 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr ratios show a peculiar and unique composition among Icelandic geothermal fluids. The 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr 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. Article in Journal/Newspaper Iceland Directory of Open Access Journals: DOAJ Articles Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) Námafjall ENVELOPE(-16.820,-16.820,65.631,65.631) Geosciences 12 3 119 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
87 Sr/ 86 Sr atmospheric noble gases geothermal fluids seawater glacial water Theistareykir Geology QE1-996.5 |
spellingShingle |
87 Sr/ 86 Sr atmospheric noble gases geothermal fluids seawater glacial water Theistareykir Geology QE1-996.5 Daniele Luigi Pinti Marie Haut-Labourdette André Poirier Marion Saby Vincent J. van Hinsberg Kim Berlo Maria Clara Castro Bjarni Gautason Ásgerður K. Sigurðardóttir 87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water |
topic_facet |
87 Sr/ 86 Sr atmospheric noble gases geothermal fluids seawater glacial water Theistareykir Geology QE1-996.5 |
description |
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 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr ratios show a peculiar and unique composition among Icelandic geothermal fluids. The 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr 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. |
format |
Article in Journal/Newspaper |
author |
Daniele Luigi Pinti Marie Haut-Labourdette André Poirier Marion Saby Vincent J. van Hinsberg Kim Berlo Maria Clara Castro Bjarni Gautason Ásgerður K. Sigurðardóttir |
author_facet |
Daniele Luigi Pinti Marie Haut-Labourdette André Poirier Marion Saby Vincent J. van Hinsberg Kim Berlo Maria Clara Castro Bjarni Gautason Ásgerður K. Sigurðardóttir |
author_sort |
Daniele Luigi Pinti |
title |
87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water |
title_short |
87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water |
title_full |
87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water |
title_fullStr |
87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water |
title_full_unstemmed |
87 Sr/ 86 Sr Ratios and Atmospheric Noble Gases in Theistareykir Geothermal Fluids: A Record of Glacial Water |
title_sort |
87 sr/ 86 sr ratios and atmospheric noble gases in theistareykir geothermal fluids: a record of glacial water |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/geosciences12030119 https://doaj.org/article/4b9fcdd9966d4406bf89cb61368d34ba |
long_lat |
ENVELOPE(-16.747,-16.747,65.713,65.713) ENVELOPE(-16.820,-16.820,65.631,65.631) |
geographic |
Krafla Námafjall |
geographic_facet |
Krafla Námafjall |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geosciences, Vol 12, Iss 119, p 119 (2022) |
op_relation |
https://www.mdpi.com/2076-3263/12/3/119 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences12030119 2076-3263 https://doaj.org/article/4b9fcdd9966d4406bf89cb61368d34ba |
op_doi |
https://doi.org/10.3390/geosciences12030119 |
container_title |
Geosciences |
container_volume |
12 |
container_issue |
3 |
container_start_page |
119 |
_version_ |
1766041556863680512 |