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Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes

We investigated the volcanic Narlı Lake in Central Anatolia combining high-resolution bathymetry and geochemical measurements. In this study, we present it as proof of a new concept to verify fluid pathways beneath lakes integrating the structure of the geothermal reservoir into the surrounding tect...

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Autores principales: Brehme, Maren, Giese, Ronny, Dokuz, Uğur Erdem, Bulut, Fatih
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8062672/
https://www.ncbi.nlm.nih.gov/pubmed/33888763
http://dx.doi.org/10.1038/s41598-021-87743-5
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author Brehme, Maren
Giese, Ronny
Dokuz, Uğur Erdem
Bulut, Fatih
author_facet Brehme, Maren
Giese, Ronny
Dokuz, Uğur Erdem
Bulut, Fatih
author_sort Brehme, Maren
collection PubMed
description We investigated the volcanic Narlı Lake in Central Anatolia combining high-resolution bathymetry and geochemical measurements. In this study, we present it as proof of a new concept to verify fluid pathways beneath lakes integrating the structure of the geothermal reservoir into the surrounding tectonic frame. We recognized dextral faults fracturing inherited volcanic formations and thus generating highly permeable zones beneath the lake. At intersection points of faults, reservoir fluids discharge from deep holes as imaged by the high-resolution bathymetry at the bottom of the Narlı Lake. Onshore, the tectonic setting also generates both extensional and compressional structures. Extensional structures result in extensive fluid discharge through hot springs while compressional structures do not discharge any fluid. The water of the lake as well as in the hot springs is highly saline and has relatively high concentrations of Cl, HCO(3), SO(4), Na, Ca, Mg, and Si. In several hot springs, we observed mixtures of high-saline fluids having a deep origin and low-saline shallow groundwater. We observed discharge into the lake by gas bubbles, which contain probably CO(2) or H(2)S. Mineral precipitation indicates a carbonatic source at the lake bottom and along the shoreline. Extensive travertine precipitation also occurs near hot springs along the nearby extensional zone of Ihlara Valley. In summary, the composition of fluids and minerals is controlled by water–rock interaction through the volcanic and carbonatic rocks beneath this volcanic lake.
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spelling pubmed-80626722021-04-27 Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes Brehme, Maren Giese, Ronny Dokuz, Uğur Erdem Bulut, Fatih Sci Rep Article We investigated the volcanic Narlı Lake in Central Anatolia combining high-resolution bathymetry and geochemical measurements. In this study, we present it as proof of a new concept to verify fluid pathways beneath lakes integrating the structure of the geothermal reservoir into the surrounding tectonic frame. We recognized dextral faults fracturing inherited volcanic formations and thus generating highly permeable zones beneath the lake. At intersection points of faults, reservoir fluids discharge from deep holes as imaged by the high-resolution bathymetry at the bottom of the Narlı Lake. Onshore, the tectonic setting also generates both extensional and compressional structures. Extensional structures result in extensive fluid discharge through hot springs while compressional structures do not discharge any fluid. The water of the lake as well as in the hot springs is highly saline and has relatively high concentrations of Cl, HCO(3), SO(4), Na, Ca, Mg, and Si. In several hot springs, we observed mixtures of high-saline fluids having a deep origin and low-saline shallow groundwater. We observed discharge into the lake by gas bubbles, which contain probably CO(2) or H(2)S. Mineral precipitation indicates a carbonatic source at the lake bottom and along the shoreline. Extensive travertine precipitation also occurs near hot springs along the nearby extensional zone of Ihlara Valley. In summary, the composition of fluids and minerals is controlled by water–rock interaction through the volcanic and carbonatic rocks beneath this volcanic lake. Nature Publishing Group UK 2021-04-22 /pmc/articles/PMC8062672/ /pubmed/33888763 http://dx.doi.org/10.1038/s41598-021-87743-5 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Brehme, Maren
Giese, Ronny
Dokuz, Uğur Erdem
Bulut, Fatih
Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes
title Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes
title_full Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes
title_fullStr Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes
title_full_unstemmed Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes
title_short Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes
title_sort fluid pathways identified beneath narlı lake (central anatolia) show the geothermal potential of former volcanoes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8062672/
https://www.ncbi.nlm.nih.gov/pubmed/33888763
http://dx.doi.org/10.1038/s41598-021-87743-5
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