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Gas geothermometry and equilibria in Icelandic geothermal systems

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Titill: Gas geothermometry and equilibria in Icelandic geothermal systemsGas geothermometry and equilibria in Icelandic geothermal systems
Höfundur: Jarðhitaskóli Háskóla Sameinuðu þjóðanna ; Belay Solomon, Temesghen
URI: http://hdl.handle.net/10802/16637
Útgefandi: United Nations University; Orkustofnun
Útgáfa: 2018
Ritröð: United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 2017 : 7
Efnisorð: Jarðhiti; Jarðefnafræði; Jarðhitakerfi; Ísland
ISSN: 1670-7427
Tungumál: Íslenska
Tengd vefsíðuslóð: https://orkustofnun.is/gogn/unu-gtp-report/UNU-GTP-2017-07.pdf
Tegund: Bók
Gegnir ID: 001508264
Athugasemdir: Birtist í : Geothermal Training in Iceland 2017, bls. 1-12
Útdráttur: The gas geothermometer temperatures and gas equilibria in Icelandic geothermal systems were studied. Around 290 samples of fumarole vapour samples from six geothermal areas in Iceland, Geysir, Hveravellir, Hengill, Reykjanes, Krafla and Torfajökull, were considered. A large range of temperatures was often observed within a given geothermal system with temperatures ranging from <100 to >800°C. Based on the calculated temperatures it can be concluded that factors other than temperature dependent fluid-mineral equilibria must influence fumarole gas composition at surface, for instance magma gas flux, open system boiling and phase separation, vapour condensation, mixing and oxidation at shallow depth. Based on the observations made in this study it is concluded that gas geothermometery temperatures may in many cases not reflect subsurface reservoir fluid temperatures of geothermal system but rather the source(s) of the gases and secondary processes occurring upon fluid ascent to surface


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