Opin vísindi

Supercritical Fluid Geochemistry in Geothermal Systems

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Heřmanská, Matylda
dc.contributor.author Kleine, Barbara Irene
dc.contributor.author Stefansson, Andri
dc.date.accessioned 2020-06-22T09:30:28Z
dc.date.available 2020-06-22T09:30:28Z
dc.date.issued 2019-08-05
dc.identifier.citation Heřmanská, M., Kleine, B. I., & Stefánsson, A. (2019). Supercritical Fluid Geochemistry in Geothermal Systems. Geofluids, 2019, 6023534. doi:10.1155/2019/6023534
dc.identifier.issn 1468-8115
dc.identifier.issn 1468-8123 (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/1897
dc.description Publisher's version
dc.description.abstract Supercritical fluids exist in the roots of many active high-temperature geothermal systems. Utilization of such supercritical resources may multiply energy production from geothermal systems; yet, their occurrence, formation mechanism, and chemical properties are poorly constrained. Flow-through experiments at 260°C and 400-420°C were performed to study the chemical and mineralogical changes associated with supercritical fluid formation near shallow magmatic intrusions by conductive heating and boiling of conventional subcritical geothermal fluids. Supercritical fluids formed by isobaric heating of liquid geothermal water had similar volatile element concentrations (B, C, and S) as the subcritical water. In contrast, mineral-forming element concentrations (Si, Na, K, Ca, Mg, and Cl) in the supercritical fluid were much lower. The results are consistent with the observed mineral deposition of quartz, aluminum silicates, and minor amount of salts during boiling. Similar concentration patterns have been predicted from geochemical modeling and were observed at Krafla, Iceland, for the IDDP-1 supercritical fluid discharge. The experimental results confirm previous findings that supercritical fluids may originate from conductive heating of subcritical geothermal reservoir fluids characterized by similar or lower elemental concentrations with minor input of volcanic gas.
dc.description.sponsorship We would like to thank Ríkey Kjartansdóttir, Andri Ísak Thórhallsson, and Helgi Arnar Alfreðsson for their valuable help. This work was funded by the Swiss National Science Foundation (CRSII2_1418431/1, Sinergia COTHERM), Georg (11-04-003), and The Energy Research Fund of Landsvirkjun in 2018 and 2019.
dc.format.extent 6023534
dc.language.iso en
dc.publisher Hindawi Limited
dc.relation.ispartofseries Geofluids;2019
dc.rights info:eu-repo/semantics/openAccess
dc.subject Geochemistry
dc.subject Iceland
dc.subject Krafla
dc.subject Geothermal systems
dc.subject Jarðeðlisfræði
dc.subject Jarðhitakerfi
dc.subject Jarðhitasvæði
dc.title Supercritical Fluid Geochemistry in Geothermal Systems
dc.type info:eu-repo/semantics/article
dcterms.license This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.description.version Peer Reviewed
dc.identifier.journal Geofluids
dc.identifier.doi 10.1155/2019/6023534
dc.relation.url https://www.hindawi.com/journals/geofluids/2019/6023534/
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)


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