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

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dc.authoridBrehme, Maren/0000-0003-1862-2767
dc.contributor.authorBrehme, Maren
dc.contributor.authorGiese, Ronny
dc.contributor.authorDokuz, Ugur Erdem
dc.contributor.authorBulut, Fatih
dc.date.accessioned2024-11-07T13:35:01Z
dc.date.available2024-11-07T13:35:01Z
dc.date.issued2021
dc.departmentNiğde Ömer Halisdemir Üniversitesi
dc.description.abstractWe investigated the volcanic Narli 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 Narli 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, HCO3, SO4, 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 CO2 or H2S. 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.
dc.description.sponsorshipBogazici University - Kandilli Observatory - Science Academy Turkey; Helmholtz-Center Potsdam-GFZ internal expedition budget; Science Academy Turkey
dc.description.sponsorshipWe gratefully acknowledge Bogazici University - Kandilli Observatory for their support, especially Asli Dogru. The authors thank Emre Otay for his continuous support during the preparation and conduction of fieldwork by providing equipment and advice. The permission and access to the field by the cities of Nigde and Aksaray is highly appreciated. Special thanks to GFZ Section 5.2 for borrowing field instruments. This study was funded by the Helmholtz-Center Potsdam-GFZ internal expedition budget. We thank Michael Weber for his comments on the manuscript. We highly appreciate the comments of J. Varekamp on earlier versions of the manuscript, that strongly improved the interpretation of our results and the comments of one anonymous reviewer. The authors also thank the the Science Academy Turkey for supporting the study through the Young Scientist Award (BAGEP), which has been given to Fatih Bulut in 2020.
dc.identifier.doi10.1038/s41598-021-87743-5
dc.identifier.issn2045-2322
dc.identifier.issue1
dc.identifier.pmid33888763
dc.identifier.scopus2-s2.0-85104698058
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1038/s41598-021-87743-5
dc.identifier.urihttps://hdl.handle.net/11480/16276
dc.identifier.volume11
dc.identifier.wosWOS:000642742500062
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherNature Portfolio
dc.relation.ispartofScientific Reports
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241106
dc.subjectCappadocia Region
dc.subjectTurkey
dc.subjectProvince
dc.subjectFault
dc.titleFluid pathways identified beneath Narli Lake (Central Anatolia) show the geothermal potential of former volcanoes
dc.typeArticle

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