Seltún Hot Springs

Short description: Geothermal hot spring area in Iceland

Template:Infobox spring

Seltún Hot Springs, Icelandic pronunciation: ​[ˈsɛlˌtʰuːn] (also known as Krýsuvík-Seltún Geothermal Hot Springs [ˈkʰriːsʏˌviːk], Seltúnshverir [ˈsɛlˌtʰunsˌkʰvɛːrɪr̥] and Krýsuvíkurhverir [ˈkʰriːsʏˌviːkʏrˌkʰvɛːrɪr̥]), is a geothermal hot spring system in Krýsuvík volcanic area, in southwest Iceland on the Mid-Atlantic Ridge of the Reykjanes peninsula.

## Contents

* 1 Description
* 1.1 Accessibility
* 2 Geology
* 3 Water profile
* 4 Location
* 5 Gallery
* 6 References
* 7 Further reading

## Description

Sulfur deposits on a steam vent at Seltún Hot Springs

The hot springs area contains solfataras, bubbling mud pools, fumaroles, hot springs and warm springs. The high sulphur content of the springs give them a characteristic yellow-orange color. Sulfur was mined at this location until the 1880s. An explosion caused by nearby drilling took place in 1999 that opened up a large crater vent. In 2010 and 2019 other explosions took place, spewing hot mud, water and steam over the area.[1]

The hot spring water is heated from underground geothermal sources and emerge through deep cracks and vents in the crustal zone. Superheated steam rises from below the surface of a boiling underground reservoir. It condenses and mixes with ground water, and eventually with surface water.[2]

### Accessibility

A boardwalk with viewing platforms has been constructed over the area.[3]

## Geology

The area consists of post-glacial lava fields, hyaloclastites, pillow lava ridges and pillow breccias of upper Quaternary age. The rocks are basaltic in composition. Several volcanic eruptions have occurred in the area, the last one occurring in the 13th century. The kaolinite clay mud pits are high in silica and alumina; some are stained red from iron oxide deposits in the clay. The blue clay mud pits are saturated with pyrite.[2]

## Water profile

The hot spring water emerges from the source at temperatures above 50 °C. The warm springs range in temperature from 34 °C to 50 °C. The fumaroles emit hydrogen sulphide (H2S) which oxidizes to sulphuric acid and native sulphur.[2]

## Location

The hot springs area is located at 63° 53' 42" North, 22° 3' 24" West.[4]

## Gallery

*   *   *

## References

1. ↑ Ragnarsdóttir, Regína Hrönn. "Seltún - the colourful Geothermal Area at Krýsuvík on the Reykjanesskagi Peninsula in SW-Iceland". Guide to Iceland. https://guidetoiceland.is/connect-with-locals/regina/the-colourful-geothermal-area-at-seltun-krysuvik-on-the-reykjanes-peninsula-in-sw-iceland.
2. ↑ 2.0 2.1 2.2 Khubaeva, Olga (2007). "Geothermal mapping in the Krysuvik Geothermal Field". Report of the Institute of Volcanology and Seismology 8: 145–156. https://orkustofnun.is/gogn/unu-gtp-report/UNU-GTP-2007-08.pdf. Retrieved 4 February 2021.
3. ↑ "Krysuvik". Iceland Travel. https://www.icelandtravel.is/attractions/krisuvik/.
4. ↑ "Krisuvik hot spring, Krysuvik-Seltun geothermal area, Hafnarfjörður, Capital Region, Iceland". Mindat. https://www.mindat.org/loc-31564.html.

## Further reading

* Arnórsson, S., Björnsson, A., and Gíslason, G.: Systematic exploration of the Krisuvik high- temperature area, Reykjanes Peninsula, Iceland. Orkustofnun, Reykjavik. OS-JHD-7528, 20 pages (1975)
* Courtillot V., Davaille A., Besse J., and Stock J.: Three distinct types of hotspots in the Earth’s mantle. Earth and Planetary Science, Vol. 205, p. 295-308, (2003)
* Thórdarson, T., and Larsen, G.: Volcanism in Iceland in historical time: Volcano types, eruption styles and eruptive history. J. Geodyn., Volume 43, p. 118-152. (2007)

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